4182 lines
162 KiB
Java
4182 lines
162 KiB
Java
/*
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* Copyright (C) 2006 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package android.widget;
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import android.annotation.IdRes;
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import android.annotation.NonNull;
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import android.annotation.Nullable;
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import android.compat.annotation.UnsupportedAppUsage;
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import android.content.Context;
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import android.content.Intent;
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import android.content.res.TypedArray;
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import android.graphics.Canvas;
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import android.graphics.Paint;
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import android.graphics.PixelFormat;
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import android.graphics.Rect;
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import android.graphics.drawable.Drawable;
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import android.os.Build;
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import android.os.Bundle;
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import android.os.Trace;
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import android.util.AttributeSet;
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import android.util.Log;
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import android.util.MathUtils;
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import android.util.SparseBooleanArray;
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import android.view.FocusFinder;
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import android.view.KeyEvent;
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import android.view.SoundEffectConstants;
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import android.view.View;
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import android.view.ViewDebug;
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import android.view.ViewGroup;
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import android.view.ViewHierarchyEncoder;
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import android.view.ViewParent;
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import android.view.ViewRootImpl;
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import android.view.accessibility.AccessibilityNodeInfo;
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import android.view.accessibility.AccessibilityNodeInfo.AccessibilityAction;
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import android.view.accessibility.AccessibilityNodeInfo.CollectionInfo;
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import android.view.accessibility.AccessibilityNodeInfo.CollectionItemInfo;
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import android.view.accessibility.AccessibilityNodeProvider;
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import android.view.inspector.InspectableProperty;
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import android.widget.RemoteViews.RemoteView;
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import com.android.internal.R;
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import com.google.android.collect.Lists;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.function.Predicate;
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/*
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* Implementation Notes:
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*
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* Some terminology:
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*
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* index - index of the items that are currently visible
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* position - index of the items in the cursor
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*/
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/**
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* <p>Displays a vertically-scrollable collection of views, where each view is positioned
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* immediatelybelow the previous view in the list. For a more modern, flexible, and performant
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* approach to displaying lists, use {@link androidx.recyclerview.widget.RecyclerView}.</p>
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*
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* <p>To display a list, you can include a list view in your layout XML file:</p>
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*
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* <pre><ListView
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* android:id="@+id/list_view"
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* android:layout_width="match_parent"
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* android:layout_height="match_parent" /></pre>
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*
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* <p>A list view is an <a href="{@docRoot}guide/topics/ui/declaring-layout.html#AdapterViews">
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* adapter view</a> that does not know the details, such as type and contents, of the views it
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* contains. Instead list view requests views on demand from a {@link ListAdapter} as needed,
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* such as to display new views as the user scrolls up or down.</p>
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*
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* <p>In order to display items in the list, call {@link #setAdapter(ListAdapter adapter)}
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* to associate an adapter with the list. For a simple example, see the discussion of filling an
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* adapter view with text in the
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* <a href="{@docRoot}guide/topics/ui/declaring-layout.html#FillingTheLayout">
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* Layouts</a> guide.</p>
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*
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* <p>To display a more custom view for each item in your dataset, implement a ListAdapter.
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* For example, extend {@link BaseAdapter} and create and configure the view for each data item in
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* {@code getView(...)}:</p>
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*
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* <pre>private class MyAdapter extends BaseAdapter {
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*
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* // override other abstract methods here
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*
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* @Override
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* public View getView(int position, View convertView, ViewGroup container) {
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* if (convertView == null) {
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* convertView = getLayoutInflater().inflate(R.layout.list_item, container, false);
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* }
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*
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* ((TextView) convertView.findViewById(android.R.id.text1))
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* .setText(getItem(position));
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* return convertView;
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* }
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* }</pre>
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*
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* <p class="note">ListView attempts to reuse view objects in order to improve performance and
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* avoid a lag in response to user scrolls. To take advantage of this feature, check if the
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* {@code convertView} provided to {@code getView(...)} is null before creating or inflating a new
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* view object.</p>
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*
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* <p>To specify an action when a user clicks or taps on a single list item, see
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* <a href="{@docRoot}guide/topics/ui/declaring-layout.html#HandlingUserSelections">
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* Handling click events</a>.</p>
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*
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* <p>To learn how to populate a list view with a CursorAdapter, see the discussion of filling an
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* adapter view with text in the
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* <a href="{@docRoot}guide/topics/ui/declaring-layout.html#FillingTheLayout">
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* Layouts</a> guide.
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* See <a href="{@docRoot}guide/topics/ui/layout/listview.html">
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* Using a Loader</a>
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* to learn how to avoid blocking the main thread when using a cursor.</p>
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*
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* <p class="note">Note, many examples use {@link android.app.ListActivity ListActivity}
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* or {@link android.app.ListFragment ListFragment}
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* to display a list view. Instead, favor the more flexible approach when writing your own app:
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* use a more generic Activity subclass or Fragment subclass and add a list view to the layout
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* or view hierarchy directly. This approach gives you more direct control of the
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* list view and adapter.</p>
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*
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* @attr ref android.R.styleable#ListView_entries
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* @attr ref android.R.styleable#ListView_divider
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* @attr ref android.R.styleable#ListView_dividerHeight
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* @attr ref android.R.styleable#ListView_headerDividersEnabled
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* @attr ref android.R.styleable#ListView_footerDividersEnabled
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*/
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@RemoteView
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public class ListView extends AbsListView {
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static final String TAG = "ListView";
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/**
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* Used to indicate a no preference for a position type.
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*/
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static final int NO_POSITION = -1;
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/**
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* When arrow scrolling, ListView will never scroll more than this factor
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* times the height of the list.
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*/
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private static final float MAX_SCROLL_FACTOR = 0.33f;
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/**
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* When arrow scrolling, need a certain amount of pixels to preview next
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* items. This is usually the fading edge, but if that is small enough,
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* we want to make sure we preview at least this many pixels.
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*/
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private static final int MIN_SCROLL_PREVIEW_PIXELS = 2;
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/**
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* A class that represents a fixed view in a list, for example a header at the top
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* or a footer at the bottom.
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*/
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public class FixedViewInfo {
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/** The view to add to the list */
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public View view;
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/** The data backing the view. This is returned from {@link ListAdapter#getItem(int)}. */
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public Object data;
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/** <code>true</code> if the fixed view should be selectable in the list */
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public boolean isSelectable;
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}
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@UnsupportedAppUsage
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ArrayList<FixedViewInfo> mHeaderViewInfos = Lists.newArrayList();
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@UnsupportedAppUsage
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ArrayList<FixedViewInfo> mFooterViewInfos = Lists.newArrayList();
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@UnsupportedAppUsage
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Drawable mDivider;
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@UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P, trackingBug = 115609023)
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int mDividerHeight;
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Drawable mOverScrollHeader;
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Drawable mOverScrollFooter;
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private boolean mIsCacheColorOpaque;
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private boolean mDividerIsOpaque;
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private boolean mHeaderDividersEnabled;
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private boolean mFooterDividersEnabled;
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@UnsupportedAppUsage
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private boolean mAreAllItemsSelectable = true;
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private boolean mItemsCanFocus = false;
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// used for temporary calculations.
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private final Rect mTempRect = new Rect();
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private Paint mDividerPaint;
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// the single allocated result per list view; kinda cheesey but avoids
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// allocating these thingies too often.
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private final ArrowScrollFocusResult mArrowScrollFocusResult = new ArrowScrollFocusResult();
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// Keeps focused children visible through resizes
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private FocusSelector mFocusSelector;
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public ListView(Context context) {
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this(context, null);
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}
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public ListView(Context context, AttributeSet attrs) {
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this(context, attrs, R.attr.listViewStyle);
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}
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public ListView(Context context, AttributeSet attrs, int defStyleAttr) {
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this(context, attrs, defStyleAttr, 0);
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}
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public ListView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
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super(context, attrs, defStyleAttr, defStyleRes);
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final TypedArray a = context.obtainStyledAttributes(
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attrs, R.styleable.ListView, defStyleAttr, defStyleRes);
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saveAttributeDataForStyleable(context, R.styleable.ListView,
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attrs, a, defStyleAttr, defStyleRes);
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final CharSequence[] entries = a.getTextArray(R.styleable.ListView_entries);
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if (entries != null) {
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setAdapter(new ArrayAdapter<>(context, R.layout.simple_list_item_1, entries));
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}
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final Drawable d = a.getDrawable(R.styleable.ListView_divider);
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if (d != null) {
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// Use an implicit divider height which may be explicitly
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// overridden by android:dividerHeight further down.
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setDivider(d);
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}
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final Drawable osHeader = a.getDrawable(R.styleable.ListView_overScrollHeader);
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if (osHeader != null) {
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setOverscrollHeader(osHeader);
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}
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final Drawable osFooter = a.getDrawable(R.styleable.ListView_overScrollFooter);
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if (osFooter != null) {
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setOverscrollFooter(osFooter);
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}
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// Use an explicit divider height, if specified.
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if (a.hasValueOrEmpty(R.styleable.ListView_dividerHeight)) {
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final int dividerHeight = a.getDimensionPixelSize(
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R.styleable.ListView_dividerHeight, 0);
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if (dividerHeight != 0) {
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setDividerHeight(dividerHeight);
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}
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}
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mHeaderDividersEnabled = a.getBoolean(R.styleable.ListView_headerDividersEnabled, true);
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mFooterDividersEnabled = a.getBoolean(R.styleable.ListView_footerDividersEnabled, true);
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a.recycle();
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}
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/**
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* @return The maximum amount a list view will scroll in response to
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* an arrow event.
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*/
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public int getMaxScrollAmount() {
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return (int) (MAX_SCROLL_FACTOR * (mBottom - mTop));
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}
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/**
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* Make sure views are touching the top or bottom edge, as appropriate for
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* our gravity
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*/
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private void adjustViewsUpOrDown() {
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final int childCount = getChildCount();
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int delta;
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if (childCount > 0) {
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View child;
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if (!mStackFromBottom) {
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// Uh-oh -- we came up short. Slide all views up to make them
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// align with the top
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child = getChildAt(0);
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delta = child.getTop() - mListPadding.top;
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if (mFirstPosition != 0) {
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// It's OK to have some space above the first item if it is
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// part of the vertical spacing
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delta -= mDividerHeight;
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}
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if (delta < 0) {
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// We only are looking to see if we are too low, not too high
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delta = 0;
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}
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} else {
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// we are too high, slide all views down to align with bottom
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child = getChildAt(childCount - 1);
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delta = child.getBottom() - (getHeight() - mListPadding.bottom);
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if (mFirstPosition + childCount < mItemCount) {
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// It's OK to have some space below the last item if it is
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// part of the vertical spacing
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delta += mDividerHeight;
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}
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if (delta > 0) {
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delta = 0;
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}
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}
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if (delta != 0) {
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offsetChildrenTopAndBottom(-delta);
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}
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}
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}
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/**
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* Add a fixed view to appear at the top of the list. If this method is
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* called more than once, the views will appear in the order they were
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* added. Views added using this call can take focus if they want.
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* <p>
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* Note: When first introduced, this method could only be called before
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* setting the adapter with {@link #setAdapter(ListAdapter)}. Starting with
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* {@link android.os.Build.VERSION_CODES#KITKAT}, this method may be
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* called at any time. If the ListView's adapter does not extend
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* {@link HeaderViewListAdapter}, it will be wrapped with a supporting
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* instance of {@link WrapperListAdapter}.
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*
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* @param v The view to add.
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* @param data Data to associate with this view
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* @param isSelectable whether the item is selectable
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*/
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public void addHeaderView(View v, Object data, boolean isSelectable) {
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if (v.getParent() != null && v.getParent() != this) {
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if (Log.isLoggable(TAG, Log.WARN)) {
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Log.w(TAG, "The specified child already has a parent. "
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+ "You must call removeView() on the child's parent first.");
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}
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}
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final FixedViewInfo info = new FixedViewInfo();
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info.view = v;
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info.data = data;
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info.isSelectable = isSelectable;
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mHeaderViewInfos.add(info);
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mAreAllItemsSelectable &= isSelectable;
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// Wrap the adapter if it wasn't already wrapped.
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if (mAdapter != null) {
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if (!(mAdapter instanceof HeaderViewListAdapter)) {
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wrapHeaderListAdapterInternal();
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}
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// In the case of re-adding a header view, or adding one later on,
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// we need to notify the observer.
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if (mDataSetObserver != null) {
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mDataSetObserver.onChanged();
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}
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}
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}
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/**
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* Add a fixed view to appear at the top of the list. If addHeaderView is
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* called more than once, the views will appear in the order they were
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* added. Views added using this call can take focus if they want.
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* <p>
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* Note: When first introduced, this method could only be called before
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* setting the adapter with {@link #setAdapter(ListAdapter)}. Starting with
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* {@link android.os.Build.VERSION_CODES#KITKAT}, this method may be
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* called at any time. If the ListView's adapter does not extend
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* {@link HeaderViewListAdapter}, it will be wrapped with a supporting
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* instance of {@link WrapperListAdapter}.
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*
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* @param v The view to add.
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*/
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public void addHeaderView(View v) {
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addHeaderView(v, null, true);
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}
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@Override
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public int getHeaderViewsCount() {
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return mHeaderViewInfos.size();
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}
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/**
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* Removes a previously-added header view.
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*
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* @param v The view to remove
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* @return true if the view was removed, false if the view was not a header
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* view
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*/
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public boolean removeHeaderView(View v) {
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if (mHeaderViewInfos.size() > 0) {
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boolean result = false;
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if (mAdapter != null && ((HeaderViewListAdapter) mAdapter).removeHeader(v)) {
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if (mDataSetObserver != null) {
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mDataSetObserver.onChanged();
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}
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result = true;
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}
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removeFixedViewInfo(v, mHeaderViewInfos);
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return result;
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}
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return false;
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}
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private void removeFixedViewInfo(View v, ArrayList<FixedViewInfo> where) {
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int len = where.size();
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for (int i = 0; i < len; ++i) {
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FixedViewInfo info = where.get(i);
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if (info.view == v) {
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where.remove(i);
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break;
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}
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}
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}
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/**
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* Add a fixed view to appear at the bottom of the list. If addFooterView is
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* called more than once, the views will appear in the order they were
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* added. Views added using this call can take focus if they want.
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* <p>
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* Note: When first introduced, this method could only be called before
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* setting the adapter with {@link #setAdapter(ListAdapter)}. Starting with
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* {@link android.os.Build.VERSION_CODES#KITKAT}, this method may be
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* called at any time. If the ListView's adapter does not extend
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* {@link HeaderViewListAdapter}, it will be wrapped with a supporting
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* instance of {@link WrapperListAdapter}.
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*
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* @param v The view to add.
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* @param data Data to associate with this view
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* @param isSelectable true if the footer view can be selected
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*/
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public void addFooterView(View v, Object data, boolean isSelectable) {
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if (v.getParent() != null && v.getParent() != this) {
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if (Log.isLoggable(TAG, Log.WARN)) {
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Log.w(TAG, "The specified child already has a parent. "
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+ "You must call removeView() on the child's parent first.");
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}
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}
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final FixedViewInfo info = new FixedViewInfo();
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info.view = v;
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info.data = data;
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info.isSelectable = isSelectable;
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mFooterViewInfos.add(info);
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mAreAllItemsSelectable &= isSelectable;
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// Wrap the adapter if it wasn't already wrapped.
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if (mAdapter != null) {
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if (!(mAdapter instanceof HeaderViewListAdapter)) {
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wrapHeaderListAdapterInternal();
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}
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// In the case of re-adding a footer view, or adding one later on,
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// we need to notify the observer.
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if (mDataSetObserver != null) {
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mDataSetObserver.onChanged();
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}
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}
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}
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/**
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* Add a fixed view to appear at the bottom of the list. If addFooterView is
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* called more than once, the views will appear in the order they were
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* added. Views added using this call can take focus if they want.
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* <p>
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* Note: When first introduced, this method could only be called before
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|
* setting the adapter with {@link #setAdapter(ListAdapter)}. Starting with
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* {@link android.os.Build.VERSION_CODES#KITKAT}, this method may be
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* called at any time. If the ListView's adapter does not extend
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* {@link HeaderViewListAdapter}, it will be wrapped with a supporting
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* instance of {@link WrapperListAdapter}.
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*
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* @param v The view to add.
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*/
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public void addFooterView(View v) {
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addFooterView(v, null, true);
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}
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@Override
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public int getFooterViewsCount() {
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return mFooterViewInfos.size();
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}
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/**
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* Removes a previously-added footer view.
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*
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|
* @param v The view to remove
|
|
* @return
|
|
* true if the view was removed, false if the view was not a footer view
|
|
*/
|
|
public boolean removeFooterView(View v) {
|
|
if (mFooterViewInfos.size() > 0) {
|
|
boolean result = false;
|
|
if (mAdapter != null && ((HeaderViewListAdapter) mAdapter).removeFooter(v)) {
|
|
if (mDataSetObserver != null) {
|
|
mDataSetObserver.onChanged();
|
|
}
|
|
result = true;
|
|
}
|
|
removeFixedViewInfo(v, mFooterViewInfos);
|
|
return result;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Returns the adapter currently in use in this ListView. The returned adapter
|
|
* might not be the same adapter passed to {@link #setAdapter(ListAdapter)} but
|
|
* might be a {@link WrapperListAdapter}.
|
|
*
|
|
* @return The adapter currently used to display data in this ListView.
|
|
*
|
|
* @see #setAdapter(ListAdapter)
|
|
*/
|
|
@Override
|
|
public ListAdapter getAdapter() {
|
|
return mAdapter;
|
|
}
|
|
|
|
/**
|
|
* Sets up this AbsListView to use a remote views adapter which connects to a RemoteViewsService
|
|
* through the specified intent.
|
|
* @param intent the intent used to identify the RemoteViewsService for the adapter to connect to.
|
|
*/
|
|
@android.view.RemotableViewMethod(asyncImpl="setRemoteViewsAdapterAsync")
|
|
public void setRemoteViewsAdapter(Intent intent) {
|
|
super.setRemoteViewsAdapter(intent);
|
|
}
|
|
|
|
/**
|
|
* Sets the data behind this ListView.
|
|
*
|
|
* The adapter passed to this method may be wrapped by a {@link WrapperListAdapter},
|
|
* depending on the ListView features currently in use. For instance, adding
|
|
* headers and/or footers will cause the adapter to be wrapped.
|
|
*
|
|
* @param adapter The ListAdapter which is responsible for maintaining the
|
|
* data backing this list and for producing a view to represent an
|
|
* item in that data set.
|
|
*
|
|
* @see #getAdapter()
|
|
*/
|
|
@Override
|
|
public void setAdapter(ListAdapter adapter) {
|
|
if (mAdapter != null && mDataSetObserver != null) {
|
|
mAdapter.unregisterDataSetObserver(mDataSetObserver);
|
|
}
|
|
|
|
resetList();
|
|
mRecycler.clear();
|
|
|
|
if (mHeaderViewInfos.size() > 0|| mFooterViewInfos.size() > 0) {
|
|
mAdapter = wrapHeaderListAdapterInternal(mHeaderViewInfos, mFooterViewInfos, adapter);
|
|
} else {
|
|
mAdapter = adapter;
|
|
}
|
|
|
|
mOldSelectedPosition = INVALID_POSITION;
|
|
mOldSelectedRowId = INVALID_ROW_ID;
|
|
|
|
// AbsListView#setAdapter will update choice mode states.
|
|
super.setAdapter(adapter);
|
|
|
|
if (mAdapter != null) {
|
|
mAreAllItemsSelectable = mAdapter.areAllItemsEnabled();
|
|
mOldItemCount = mItemCount;
|
|
mItemCount = mAdapter.getCount();
|
|
checkFocus();
|
|
|
|
mDataSetObserver = new AdapterDataSetObserver();
|
|
mAdapter.registerDataSetObserver(mDataSetObserver);
|
|
|
|
mRecycler.setViewTypeCount(mAdapter.getViewTypeCount());
|
|
|
|
int position;
|
|
if (mStackFromBottom) {
|
|
position = lookForSelectablePosition(mItemCount - 1, false);
|
|
} else {
|
|
position = lookForSelectablePosition(0, true);
|
|
}
|
|
setSelectedPositionInt(position);
|
|
setNextSelectedPositionInt(position);
|
|
|
|
if (mItemCount == 0) {
|
|
// Nothing selected
|
|
checkSelectionChanged();
|
|
}
|
|
} else {
|
|
mAreAllItemsSelectable = true;
|
|
checkFocus();
|
|
// Nothing selected
|
|
checkSelectionChanged();
|
|
}
|
|
|
|
requestLayout();
|
|
}
|
|
|
|
/**
|
|
* The list is empty. Clear everything out.
|
|
*/
|
|
@Override
|
|
void resetList() {
|
|
// The parent's resetList() will remove all views from the layout so we need to
|
|
// cleanup the state of our footers and headers
|
|
clearRecycledState(mHeaderViewInfos);
|
|
clearRecycledState(mFooterViewInfos);
|
|
|
|
super.resetList();
|
|
|
|
mLayoutMode = LAYOUT_NORMAL;
|
|
}
|
|
|
|
private void clearRecycledState(ArrayList<FixedViewInfo> infos) {
|
|
if (infos != null) {
|
|
final int count = infos.size();
|
|
|
|
for (int i = 0; i < count; i++) {
|
|
final View child = infos.get(i).view;
|
|
final ViewGroup.LayoutParams params = child.getLayoutParams();
|
|
if (checkLayoutParams(params)) {
|
|
((LayoutParams) params).recycledHeaderFooter = false;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @return Whether the list needs to show the top fading edge
|
|
*/
|
|
private boolean showingTopFadingEdge() {
|
|
final int listTop = mScrollY + mListPadding.top;
|
|
return (mFirstPosition > 0) || (getChildAt(0).getTop() > listTop);
|
|
}
|
|
|
|
/**
|
|
* @return Whether the list needs to show the bottom fading edge
|
|
*/
|
|
private boolean showingBottomFadingEdge() {
|
|
final int childCount = getChildCount();
|
|
final int bottomOfBottomChild = getChildAt(childCount - 1).getBottom();
|
|
final int lastVisiblePosition = mFirstPosition + childCount - 1;
|
|
|
|
final int listBottom = mScrollY + getHeight() - mListPadding.bottom;
|
|
|
|
return (lastVisiblePosition < mItemCount - 1)
|
|
|| (bottomOfBottomChild < listBottom);
|
|
}
|
|
|
|
|
|
@Override
|
|
public boolean requestChildRectangleOnScreen(View child, Rect rect, boolean immediate) {
|
|
|
|
int rectTopWithinChild = rect.top;
|
|
|
|
// offset so rect is in coordinates of the this view
|
|
rect.offset(child.getLeft(), child.getTop());
|
|
rect.offset(-child.getScrollX(), -child.getScrollY());
|
|
|
|
final int height = getHeight();
|
|
int listUnfadedTop = getScrollY();
|
|
int listUnfadedBottom = listUnfadedTop + height;
|
|
final int fadingEdge = getVerticalFadingEdgeLength();
|
|
|
|
if (showingTopFadingEdge()) {
|
|
// leave room for top fading edge as long as rect isn't at very top
|
|
if ((mSelectedPosition > 0) || (rectTopWithinChild > fadingEdge)) {
|
|
listUnfadedTop += fadingEdge;
|
|
}
|
|
}
|
|
|
|
int childCount = getChildCount();
|
|
int bottomOfBottomChild = getChildAt(childCount - 1).getBottom();
|
|
|
|
if (showingBottomFadingEdge()) {
|
|
// leave room for bottom fading edge as long as rect isn't at very bottom
|
|
if ((mSelectedPosition < mItemCount - 1)
|
|
|| (rect.bottom < (bottomOfBottomChild - fadingEdge))) {
|
|
listUnfadedBottom -= fadingEdge;
|
|
}
|
|
}
|
|
|
|
int scrollYDelta = 0;
|
|
|
|
if (rect.bottom > listUnfadedBottom && rect.top > listUnfadedTop) {
|
|
// need to MOVE DOWN to get it in view: move down just enough so
|
|
// that the entire rectangle is in view (or at least the first
|
|
// screen size chunk).
|
|
|
|
if (rect.height() > height) {
|
|
// just enough to get screen size chunk on
|
|
scrollYDelta += (rect.top - listUnfadedTop);
|
|
} else {
|
|
// get entire rect at bottom of screen
|
|
scrollYDelta += (rect.bottom - listUnfadedBottom);
|
|
}
|
|
|
|
// make sure we aren't scrolling beyond the end of our children
|
|
int distanceToBottom = bottomOfBottomChild - listUnfadedBottom;
|
|
scrollYDelta = Math.min(scrollYDelta, distanceToBottom);
|
|
} else if (rect.top < listUnfadedTop && rect.bottom < listUnfadedBottom) {
|
|
// need to MOVE UP to get it in view: move up just enough so that
|
|
// entire rectangle is in view (or at least the first screen
|
|
// size chunk of it).
|
|
|
|
if (rect.height() > height) {
|
|
// screen size chunk
|
|
scrollYDelta -= (listUnfadedBottom - rect.bottom);
|
|
} else {
|
|
// entire rect at top
|
|
scrollYDelta -= (listUnfadedTop - rect.top);
|
|
}
|
|
|
|
// make sure we aren't scrolling any further than the top our children
|
|
int top = getChildAt(0).getTop();
|
|
int deltaToTop = top - listUnfadedTop;
|
|
scrollYDelta = Math.max(scrollYDelta, deltaToTop);
|
|
}
|
|
|
|
final boolean scroll = scrollYDelta != 0;
|
|
if (scroll) {
|
|
scrollListItemsBy(-scrollYDelta);
|
|
positionSelector(INVALID_POSITION, child);
|
|
mSelectedTop = child.getTop();
|
|
invalidate();
|
|
}
|
|
return scroll;
|
|
}
|
|
|
|
/**
|
|
* {@inheritDoc}
|
|
*/
|
|
@Override
|
|
void fillGap(boolean down) {
|
|
final int count = getChildCount();
|
|
if (down) {
|
|
int paddingTop = 0;
|
|
if ((mGroupFlags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK) {
|
|
paddingTop = getListPaddingTop();
|
|
}
|
|
final int startOffset = count > 0 ? getChildAt(count - 1).getBottom() + mDividerHeight :
|
|
paddingTop;
|
|
fillDown(mFirstPosition + count, startOffset);
|
|
correctTooHigh(getChildCount());
|
|
} else {
|
|
int paddingBottom = 0;
|
|
if ((mGroupFlags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK) {
|
|
paddingBottom = getListPaddingBottom();
|
|
}
|
|
final int startOffset = count > 0 ? getChildAt(0).getTop() - mDividerHeight :
|
|
getHeight() - paddingBottom;
|
|
fillUp(mFirstPosition - 1, startOffset);
|
|
correctTooLow(getChildCount());
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Fills the list from pos down to the end of the list view.
|
|
*
|
|
* @param pos The first position to put in the list
|
|
*
|
|
* @param nextTop The location where the top of the item associated with pos
|
|
* should be drawn
|
|
*
|
|
* @return The view that is currently selected, if it happens to be in the
|
|
* range that we draw.
|
|
*/
|
|
@UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P)
|
|
private View fillDown(int pos, int nextTop) {
|
|
View selectedView = null;
|
|
|
|
int end = (mBottom - mTop);
|
|
if ((mGroupFlags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK) {
|
|
end -= mListPadding.bottom;
|
|
}
|
|
|
|
while (nextTop < end && pos < mItemCount) {
|
|
// is this the selected item?
|
|
boolean selected = pos == mSelectedPosition;
|
|
View child = makeAndAddView(pos, nextTop, true, mListPadding.left, selected);
|
|
|
|
nextTop = child.getBottom() + mDividerHeight;
|
|
if (selected) {
|
|
selectedView = child;
|
|
}
|
|
pos++;
|
|
}
|
|
|
|
setVisibleRangeHint(mFirstPosition, mFirstPosition + getChildCount() - 1);
|
|
return selectedView;
|
|
}
|
|
|
|
/**
|
|
* Fills the list from pos up to the top of the list view.
|
|
*
|
|
* @param pos The first position to put in the list
|
|
*
|
|
* @param nextBottom The location where the bottom of the item associated
|
|
* with pos should be drawn
|
|
*
|
|
* @return The view that is currently selected
|
|
*/
|
|
@UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P)
|
|
private View fillUp(int pos, int nextBottom) {
|
|
View selectedView = null;
|
|
|
|
int end = 0;
|
|
if ((mGroupFlags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK) {
|
|
end = mListPadding.top;
|
|
}
|
|
|
|
while (nextBottom > end && pos >= 0) {
|
|
// is this the selected item?
|
|
boolean selected = pos == mSelectedPosition;
|
|
View child = makeAndAddView(pos, nextBottom, false, mListPadding.left, selected);
|
|
nextBottom = child.getTop() - mDividerHeight;
|
|
if (selected) {
|
|
selectedView = child;
|
|
}
|
|
pos--;
|
|
}
|
|
|
|
mFirstPosition = pos + 1;
|
|
setVisibleRangeHint(mFirstPosition, mFirstPosition + getChildCount() - 1);
|
|
return selectedView;
|
|
}
|
|
|
|
/**
|
|
* Fills the list from top to bottom, starting with mFirstPosition
|
|
*
|
|
* @param nextTop The location where the top of the first item should be
|
|
* drawn
|
|
*
|
|
* @return The view that is currently selected
|
|
*/
|
|
private View fillFromTop(int nextTop) {
|
|
mFirstPosition = Math.min(mFirstPosition, mSelectedPosition);
|
|
mFirstPosition = Math.min(mFirstPosition, mItemCount - 1);
|
|
if (mFirstPosition < 0) {
|
|
mFirstPosition = 0;
|
|
}
|
|
return fillDown(mFirstPosition, nextTop);
|
|
}
|
|
|
|
|
|
/**
|
|
* Put mSelectedPosition in the middle of the screen and then build up and
|
|
* down from there. This method forces mSelectedPosition to the center.
|
|
*
|
|
* @param childrenTop Top of the area in which children can be drawn, as
|
|
* measured in pixels
|
|
* @param childrenBottom Bottom of the area in which children can be drawn,
|
|
* as measured in pixels
|
|
* @return Currently selected view
|
|
*/
|
|
private View fillFromMiddle(int childrenTop, int childrenBottom) {
|
|
int height = childrenBottom - childrenTop;
|
|
|
|
int position = reconcileSelectedPosition();
|
|
|
|
View sel = makeAndAddView(position, childrenTop, true,
|
|
mListPadding.left, true);
|
|
mFirstPosition = position;
|
|
|
|
int selHeight = sel.getMeasuredHeight();
|
|
if (selHeight <= height) {
|
|
sel.offsetTopAndBottom((height - selHeight) / 2);
|
|
}
|
|
|
|
fillAboveAndBelow(sel, position);
|
|
|
|
if (!mStackFromBottom) {
|
|
correctTooHigh(getChildCount());
|
|
} else {
|
|
correctTooLow(getChildCount());
|
|
}
|
|
|
|
return sel;
|
|
}
|
|
|
|
/**
|
|
* Once the selected view as been placed, fill up the visible area above and
|
|
* below it.
|
|
*
|
|
* @param sel The selected view
|
|
* @param position The position corresponding to sel
|
|
*/
|
|
private void fillAboveAndBelow(View sel, int position) {
|
|
final int dividerHeight = mDividerHeight;
|
|
if (!mStackFromBottom) {
|
|
fillUp(position - 1, sel.getTop() - dividerHeight);
|
|
adjustViewsUpOrDown();
|
|
fillDown(position + 1, sel.getBottom() + dividerHeight);
|
|
} else {
|
|
fillDown(position + 1, sel.getBottom() + dividerHeight);
|
|
adjustViewsUpOrDown();
|
|
fillUp(position - 1, sel.getTop() - dividerHeight);
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* Fills the grid based on positioning the new selection at a specific
|
|
* location. The selection may be moved so that it does not intersect the
|
|
* faded edges. The grid is then filled upwards and downwards from there.
|
|
*
|
|
* @param selectedTop Where the selected item should be
|
|
* @param childrenTop Where to start drawing children
|
|
* @param childrenBottom Last pixel where children can be drawn
|
|
* @return The view that currently has selection
|
|
*/
|
|
private View fillFromSelection(int selectedTop, int childrenTop, int childrenBottom) {
|
|
int fadingEdgeLength = getVerticalFadingEdgeLength();
|
|
final int selectedPosition = mSelectedPosition;
|
|
|
|
View sel;
|
|
|
|
final int topSelectionPixel = getTopSelectionPixel(childrenTop, fadingEdgeLength,
|
|
selectedPosition);
|
|
final int bottomSelectionPixel = getBottomSelectionPixel(childrenBottom, fadingEdgeLength,
|
|
selectedPosition);
|
|
|
|
sel = makeAndAddView(selectedPosition, selectedTop, true, mListPadding.left, true);
|
|
|
|
|
|
// Some of the newly selected item extends below the bottom of the list
|
|
if (sel.getBottom() > bottomSelectionPixel) {
|
|
// Find space available above the selection into which we can scroll
|
|
// upwards
|
|
final int spaceAbove = sel.getTop() - topSelectionPixel;
|
|
|
|
// Find space required to bring the bottom of the selected item
|
|
// fully into view
|
|
final int spaceBelow = sel.getBottom() - bottomSelectionPixel;
|
|
final int offset = Math.min(spaceAbove, spaceBelow);
|
|
|
|
// Now offset the selected item to get it into view
|
|
sel.offsetTopAndBottom(-offset);
|
|
} else if (sel.getTop() < topSelectionPixel) {
|
|
// Find space required to bring the top of the selected item fully
|
|
// into view
|
|
final int spaceAbove = topSelectionPixel - sel.getTop();
|
|
|
|
// Find space available below the selection into which we can scroll
|
|
// downwards
|
|
final int spaceBelow = bottomSelectionPixel - sel.getBottom();
|
|
final int offset = Math.min(spaceAbove, spaceBelow);
|
|
|
|
// Offset the selected item to get it into view
|
|
sel.offsetTopAndBottom(offset);
|
|
}
|
|
|
|
// Fill in views above and below
|
|
fillAboveAndBelow(sel, selectedPosition);
|
|
|
|
if (!mStackFromBottom) {
|
|
correctTooHigh(getChildCount());
|
|
} else {
|
|
correctTooLow(getChildCount());
|
|
}
|
|
|
|
return sel;
|
|
}
|
|
|
|
/**
|
|
* Calculate the bottom-most pixel we can draw the selection into
|
|
*
|
|
* @param childrenBottom Bottom pixel were children can be drawn
|
|
* @param fadingEdgeLength Length of the fading edge in pixels, if present
|
|
* @param selectedPosition The position that will be selected
|
|
* @return The bottom-most pixel we can draw the selection into
|
|
*/
|
|
private int getBottomSelectionPixel(int childrenBottom, int fadingEdgeLength,
|
|
int selectedPosition) {
|
|
int bottomSelectionPixel = childrenBottom;
|
|
if (selectedPosition != mItemCount - 1) {
|
|
bottomSelectionPixel -= fadingEdgeLength;
|
|
}
|
|
return bottomSelectionPixel;
|
|
}
|
|
|
|
/**
|
|
* Calculate the top-most pixel we can draw the selection into
|
|
*
|
|
* @param childrenTop Top pixel were children can be drawn
|
|
* @param fadingEdgeLength Length of the fading edge in pixels, if present
|
|
* @param selectedPosition The position that will be selected
|
|
* @return The top-most pixel we can draw the selection into
|
|
*/
|
|
private int getTopSelectionPixel(int childrenTop, int fadingEdgeLength, int selectedPosition) {
|
|
// first pixel we can draw the selection into
|
|
int topSelectionPixel = childrenTop;
|
|
if (selectedPosition > 0) {
|
|
topSelectionPixel += fadingEdgeLength;
|
|
}
|
|
return topSelectionPixel;
|
|
}
|
|
|
|
/**
|
|
* Smoothly scroll to the specified adapter position. The view will
|
|
* scroll such that the indicated position is displayed.
|
|
* @param position Scroll to this adapter position.
|
|
*/
|
|
@android.view.RemotableViewMethod
|
|
public void smoothScrollToPosition(int position) {
|
|
super.smoothScrollToPosition(position);
|
|
}
|
|
|
|
/**
|
|
* Smoothly scroll to the specified adapter position offset. The view will
|
|
* scroll such that the indicated position is displayed.
|
|
* @param offset The amount to offset from the adapter position to scroll to.
|
|
*/
|
|
@android.view.RemotableViewMethod
|
|
public void smoothScrollByOffset(int offset) {
|
|
super.smoothScrollByOffset(offset);
|
|
}
|
|
|
|
/**
|
|
* Fills the list based on positioning the new selection relative to the old
|
|
* selection. The new selection will be placed at, above, or below the
|
|
* location of the new selection depending on how the selection is moving.
|
|
* The selection will then be pinned to the visible part of the screen,
|
|
* excluding the edges that are faded. The list is then filled upwards and
|
|
* downwards from there.
|
|
*
|
|
* @param oldSel The old selected view. Useful for trying to put the new
|
|
* selection in the same place
|
|
* @param newSel The view that is to become selected. Useful for trying to
|
|
* put the new selection in the same place
|
|
* @param delta Which way we are moving
|
|
* @param childrenTop Where to start drawing children
|
|
* @param childrenBottom Last pixel where children can be drawn
|
|
* @return The view that currently has selection
|
|
*/
|
|
private View moveSelection(View oldSel, View newSel, int delta, int childrenTop,
|
|
int childrenBottom) {
|
|
int fadingEdgeLength = getVerticalFadingEdgeLength();
|
|
final int selectedPosition = mSelectedPosition;
|
|
|
|
View sel;
|
|
|
|
final int topSelectionPixel = getTopSelectionPixel(childrenTop, fadingEdgeLength,
|
|
selectedPosition);
|
|
final int bottomSelectionPixel = getBottomSelectionPixel(childrenTop, fadingEdgeLength,
|
|
selectedPosition);
|
|
|
|
if (delta > 0) {
|
|
/*
|
|
* Case 1: Scrolling down.
|
|
*/
|
|
|
|
/*
|
|
* Before After
|
|
* | | | |
|
|
* +-------+ +-------+
|
|
* | A | | A |
|
|
* | 1 | => +-------+
|
|
* +-------+ | B |
|
|
* | B | | 2 |
|
|
* +-------+ +-------+
|
|
* | | | |
|
|
*
|
|
* Try to keep the top of the previously selected item where it was.
|
|
* oldSel = A
|
|
* sel = B
|
|
*/
|
|
|
|
// Put oldSel (A) where it belongs
|
|
oldSel = makeAndAddView(selectedPosition - 1, oldSel.getTop(), true,
|
|
mListPadding.left, false);
|
|
|
|
final int dividerHeight = mDividerHeight;
|
|
|
|
// Now put the new selection (B) below that
|
|
sel = makeAndAddView(selectedPosition, oldSel.getBottom() + dividerHeight, true,
|
|
mListPadding.left, true);
|
|
|
|
// Some of the newly selected item extends below the bottom of the list
|
|
if (sel.getBottom() > bottomSelectionPixel) {
|
|
|
|
// Find space available above the selection into which we can scroll upwards
|
|
int spaceAbove = sel.getTop() - topSelectionPixel;
|
|
|
|
// Find space required to bring the bottom of the selected item fully into view
|
|
int spaceBelow = sel.getBottom() - bottomSelectionPixel;
|
|
|
|
// Don't scroll more than half the height of the list
|
|
int halfVerticalSpace = (childrenBottom - childrenTop) / 2;
|
|
int offset = Math.min(spaceAbove, spaceBelow);
|
|
offset = Math.min(offset, halfVerticalSpace);
|
|
|
|
// We placed oldSel, so offset that item
|
|
oldSel.offsetTopAndBottom(-offset);
|
|
// Now offset the selected item to get it into view
|
|
sel.offsetTopAndBottom(-offset);
|
|
}
|
|
|
|
// Fill in views above and below
|
|
if (!mStackFromBottom) {
|
|
fillUp(mSelectedPosition - 2, sel.getTop() - dividerHeight);
|
|
adjustViewsUpOrDown();
|
|
fillDown(mSelectedPosition + 1, sel.getBottom() + dividerHeight);
|
|
} else {
|
|
fillDown(mSelectedPosition + 1, sel.getBottom() + dividerHeight);
|
|
adjustViewsUpOrDown();
|
|
fillUp(mSelectedPosition - 2, sel.getTop() - dividerHeight);
|
|
}
|
|
} else if (delta < 0) {
|
|
/*
|
|
* Case 2: Scrolling up.
|
|
*/
|
|
|
|
/*
|
|
* Before After
|
|
* | | | |
|
|
* +-------+ +-------+
|
|
* | A | | A |
|
|
* +-------+ => | 1 |
|
|
* | B | +-------+
|
|
* | 2 | | B |
|
|
* +-------+ +-------+
|
|
* | | | |
|
|
*
|
|
* Try to keep the top of the item about to become selected where it was.
|
|
* newSel = A
|
|
* olSel = B
|
|
*/
|
|
|
|
if (newSel != null) {
|
|
// Try to position the top of newSel (A) where it was before it was selected
|
|
sel = makeAndAddView(selectedPosition, newSel.getTop(), true, mListPadding.left,
|
|
true);
|
|
} else {
|
|
// If (A) was not on screen and so did not have a view, position
|
|
// it above the oldSel (B)
|
|
sel = makeAndAddView(selectedPosition, oldSel.getTop(), false, mListPadding.left,
|
|
true);
|
|
}
|
|
|
|
// Some of the newly selected item extends above the top of the list
|
|
if (sel.getTop() < topSelectionPixel) {
|
|
// Find space required to bring the top of the selected item fully into view
|
|
int spaceAbove = topSelectionPixel - sel.getTop();
|
|
|
|
// Find space available below the selection into which we can scroll downwards
|
|
int spaceBelow = bottomSelectionPixel - sel.getBottom();
|
|
|
|
// Don't scroll more than half the height of the list
|
|
int halfVerticalSpace = (childrenBottom - childrenTop) / 2;
|
|
int offset = Math.min(spaceAbove, spaceBelow);
|
|
offset = Math.min(offset, halfVerticalSpace);
|
|
|
|
// Offset the selected item to get it into view
|
|
sel.offsetTopAndBottom(offset);
|
|
}
|
|
|
|
// Fill in views above and below
|
|
fillAboveAndBelow(sel, selectedPosition);
|
|
} else {
|
|
|
|
int oldTop = oldSel.getTop();
|
|
|
|
/*
|
|
* Case 3: Staying still
|
|
*/
|
|
sel = makeAndAddView(selectedPosition, oldTop, true, mListPadding.left, true);
|
|
|
|
// We're staying still...
|
|
if (oldTop < childrenTop) {
|
|
// ... but the top of the old selection was off screen.
|
|
// (This can happen if the data changes size out from under us)
|
|
int newBottom = sel.getBottom();
|
|
if (newBottom < childrenTop + 20) {
|
|
// Not enough visible -- bring it onscreen
|
|
sel.offsetTopAndBottom(childrenTop - sel.getTop());
|
|
}
|
|
}
|
|
|
|
// Fill in views above and below
|
|
fillAboveAndBelow(sel, selectedPosition);
|
|
}
|
|
|
|
return sel;
|
|
}
|
|
|
|
private class FocusSelector implements Runnable {
|
|
// the selector is waiting to set selection on the list view
|
|
private static final int STATE_SET_SELECTION = 1;
|
|
// the selector set the selection on the list view, waiting for a layoutChildren pass
|
|
private static final int STATE_WAIT_FOR_LAYOUT = 2;
|
|
// the selector's selection has been honored and it is waiting to request focus on the
|
|
// target child.
|
|
private static final int STATE_REQUEST_FOCUS = 3;
|
|
|
|
private int mAction;
|
|
private int mPosition;
|
|
private int mPositionTop;
|
|
|
|
FocusSelector setupForSetSelection(int position, int top) {
|
|
mPosition = position;
|
|
mPositionTop = top;
|
|
mAction = STATE_SET_SELECTION;
|
|
return this;
|
|
}
|
|
|
|
public void run() {
|
|
if (mAction == STATE_SET_SELECTION) {
|
|
setSelectionFromTop(mPosition, mPositionTop);
|
|
mAction = STATE_WAIT_FOR_LAYOUT;
|
|
} else if (mAction == STATE_REQUEST_FOCUS) {
|
|
final int childIndex = mPosition - mFirstPosition;
|
|
final View child = getChildAt(childIndex);
|
|
if (child != null) {
|
|
child.requestFocus();
|
|
}
|
|
mAction = -1;
|
|
}
|
|
}
|
|
|
|
@Nullable Runnable setupFocusIfValid(int position) {
|
|
if (mAction != STATE_WAIT_FOR_LAYOUT || position != mPosition) {
|
|
return null;
|
|
}
|
|
mAction = STATE_REQUEST_FOCUS;
|
|
return this;
|
|
}
|
|
|
|
void onLayoutComplete() {
|
|
if (mAction == STATE_WAIT_FOR_LAYOUT) {
|
|
mAction = -1;
|
|
}
|
|
}
|
|
}
|
|
|
|
@Override
|
|
protected void onDetachedFromWindow() {
|
|
if (mFocusSelector != null) {
|
|
removeCallbacks(mFocusSelector);
|
|
mFocusSelector = null;
|
|
}
|
|
super.onDetachedFromWindow();
|
|
}
|
|
|
|
@Override
|
|
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
|
|
if (getChildCount() > 0) {
|
|
View focusedChild = getFocusedChild();
|
|
if (focusedChild != null) {
|
|
final int childPosition = mFirstPosition + indexOfChild(focusedChild);
|
|
final int childBottom = focusedChild.getBottom();
|
|
final int offset = Math.max(0, childBottom - (h - mPaddingTop));
|
|
final int top = focusedChild.getTop() - offset;
|
|
if (mFocusSelector == null) {
|
|
mFocusSelector = new FocusSelector();
|
|
}
|
|
post(mFocusSelector.setupForSetSelection(childPosition, top));
|
|
}
|
|
}
|
|
super.onSizeChanged(w, h, oldw, oldh);
|
|
}
|
|
|
|
@Override
|
|
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
|
|
// Sets up mListPadding
|
|
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
|
|
|
|
final int widthMode = MeasureSpec.getMode(widthMeasureSpec);
|
|
final int heightMode = MeasureSpec.getMode(heightMeasureSpec);
|
|
int widthSize = MeasureSpec.getSize(widthMeasureSpec);
|
|
int heightSize = MeasureSpec.getSize(heightMeasureSpec);
|
|
|
|
int childWidth = 0;
|
|
int childHeight = 0;
|
|
int childState = 0;
|
|
|
|
mItemCount = mAdapter == null ? 0 : mAdapter.getCount();
|
|
if (mItemCount > 0 && (widthMode == MeasureSpec.UNSPECIFIED
|
|
|| heightMode == MeasureSpec.UNSPECIFIED)) {
|
|
final View child = obtainView(0, mIsScrap);
|
|
|
|
// Lay out child directly against the parent measure spec so that
|
|
// we can obtain exected minimum width and height.
|
|
measureScrapChild(child, 0, widthMeasureSpec, heightSize);
|
|
|
|
childWidth = child.getMeasuredWidth();
|
|
childHeight = child.getMeasuredHeight();
|
|
childState = combineMeasuredStates(childState, child.getMeasuredState());
|
|
|
|
if (recycleOnMeasure() && mRecycler.shouldRecycleViewType(
|
|
((LayoutParams) child.getLayoutParams()).viewType)) {
|
|
mRecycler.addScrapView(child, 0);
|
|
}
|
|
}
|
|
|
|
if (widthMode == MeasureSpec.UNSPECIFIED) {
|
|
widthSize = mListPadding.left + mListPadding.right + childWidth +
|
|
getVerticalScrollbarWidth();
|
|
} else {
|
|
widthSize |= (childState & MEASURED_STATE_MASK);
|
|
}
|
|
|
|
if (heightMode == MeasureSpec.UNSPECIFIED) {
|
|
heightSize = mListPadding.top + mListPadding.bottom + childHeight +
|
|
getVerticalFadingEdgeLength() * 2;
|
|
}
|
|
|
|
if (heightMode == MeasureSpec.AT_MOST) {
|
|
// TODO: after first layout we should maybe start at the first visible position, not 0
|
|
heightSize = measureHeightOfChildren(widthMeasureSpec, 0, NO_POSITION, heightSize, -1);
|
|
}
|
|
|
|
setMeasuredDimension(widthSize, heightSize);
|
|
|
|
mWidthMeasureSpec = widthMeasureSpec;
|
|
}
|
|
|
|
private void measureScrapChild(View child, int position, int widthMeasureSpec, int heightHint) {
|
|
LayoutParams p = (LayoutParams) child.getLayoutParams();
|
|
if (p == null) {
|
|
p = (AbsListView.LayoutParams) generateDefaultLayoutParams();
|
|
child.setLayoutParams(p);
|
|
}
|
|
p.viewType = mAdapter.getItemViewType(position);
|
|
p.isEnabled = mAdapter.isEnabled(position);
|
|
p.forceAdd = true;
|
|
|
|
final int childWidthSpec = ViewGroup.getChildMeasureSpec(widthMeasureSpec,
|
|
mListPadding.left + mListPadding.right, p.width);
|
|
final int lpHeight = p.height;
|
|
final int childHeightSpec;
|
|
if (lpHeight > 0) {
|
|
childHeightSpec = MeasureSpec.makeMeasureSpec(lpHeight, MeasureSpec.EXACTLY);
|
|
} else {
|
|
childHeightSpec = MeasureSpec.makeSafeMeasureSpec(heightHint, MeasureSpec.UNSPECIFIED);
|
|
}
|
|
child.measure(childWidthSpec, childHeightSpec);
|
|
|
|
// Since this view was measured directly aginst the parent measure
|
|
// spec, we must measure it again before reuse.
|
|
child.forceLayout();
|
|
}
|
|
|
|
/**
|
|
* @return True to recycle the views used to measure this ListView in
|
|
* UNSPECIFIED/AT_MOST modes, false otherwise.
|
|
* @hide
|
|
*/
|
|
@ViewDebug.ExportedProperty(category = "list")
|
|
protected boolean recycleOnMeasure() {
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Measures the height of the given range of children (inclusive) and
|
|
* returns the height with this ListView's padding and divider heights
|
|
* included. If maxHeight is provided, the measuring will stop when the
|
|
* current height reaches maxHeight.
|
|
*
|
|
* @param widthMeasureSpec The width measure spec to be given to a child's
|
|
* {@link View#measure(int, int)}.
|
|
* @param startPosition The position of the first child to be shown.
|
|
* @param endPosition The (inclusive) position of the last child to be
|
|
* shown. Specify {@link #NO_POSITION} if the last child should be
|
|
* the last available child from the adapter.
|
|
* @param maxHeight The maximum height that will be returned (if all the
|
|
* children don't fit in this value, this value will be
|
|
* returned).
|
|
* @param disallowPartialChildPosition In general, whether the returned
|
|
* height should only contain entire children. This is more
|
|
* powerful--it is the first inclusive position at which partial
|
|
* children will not be allowed. Example: it looks nice to have
|
|
* at least 3 completely visible children, and in portrait this
|
|
* will most likely fit; but in landscape there could be times
|
|
* when even 2 children can not be completely shown, so a value
|
|
* of 2 (remember, inclusive) would be good (assuming
|
|
* startPosition is 0).
|
|
* @return The height of this ListView with the given children.
|
|
*/
|
|
@UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P, trackingBug = 115609023)
|
|
final int measureHeightOfChildren(int widthMeasureSpec, int startPosition, int endPosition,
|
|
int maxHeight, int disallowPartialChildPosition) {
|
|
final ListAdapter adapter = mAdapter;
|
|
if (adapter == null) {
|
|
return mListPadding.top + mListPadding.bottom;
|
|
}
|
|
|
|
// Include the padding of the list
|
|
int returnedHeight = mListPadding.top + mListPadding.bottom;
|
|
final int dividerHeight = mDividerHeight;
|
|
// The previous height value that was less than maxHeight and contained
|
|
// no partial children
|
|
int prevHeightWithoutPartialChild = 0;
|
|
int i;
|
|
View child;
|
|
|
|
// mItemCount - 1 since endPosition parameter is inclusive
|
|
endPosition = (endPosition == NO_POSITION) ? adapter.getCount() - 1 : endPosition;
|
|
final AbsListView.RecycleBin recycleBin = mRecycler;
|
|
final boolean recyle = recycleOnMeasure();
|
|
final boolean[] isScrap = mIsScrap;
|
|
|
|
for (i = startPosition; i <= endPosition; ++i) {
|
|
child = obtainView(i, isScrap);
|
|
|
|
measureScrapChild(child, i, widthMeasureSpec, maxHeight);
|
|
|
|
if (i > 0) {
|
|
// Count the divider for all but one child
|
|
returnedHeight += dividerHeight;
|
|
}
|
|
|
|
// Recycle the view before we possibly return from the method
|
|
if (recyle && recycleBin.shouldRecycleViewType(
|
|
((LayoutParams) child.getLayoutParams()).viewType)) {
|
|
recycleBin.addScrapView(child, -1);
|
|
}
|
|
|
|
returnedHeight += child.getMeasuredHeight();
|
|
|
|
if (returnedHeight >= maxHeight) {
|
|
// We went over, figure out which height to return. If returnedHeight > maxHeight,
|
|
// then the i'th position did not fit completely.
|
|
return (disallowPartialChildPosition >= 0) // Disallowing is enabled (> -1)
|
|
&& (i > disallowPartialChildPosition) // We've past the min pos
|
|
&& (prevHeightWithoutPartialChild > 0) // We have a prev height
|
|
&& (returnedHeight != maxHeight) // i'th child did not fit completely
|
|
? prevHeightWithoutPartialChild
|
|
: maxHeight;
|
|
}
|
|
|
|
if ((disallowPartialChildPosition >= 0) && (i >= disallowPartialChildPosition)) {
|
|
prevHeightWithoutPartialChild = returnedHeight;
|
|
}
|
|
}
|
|
|
|
// At this point, we went through the range of children, and they each
|
|
// completely fit, so return the returnedHeight
|
|
return returnedHeight;
|
|
}
|
|
|
|
@Override
|
|
int findMotionRow(int y) {
|
|
int childCount = getChildCount();
|
|
if (childCount > 0) {
|
|
if (!mStackFromBottom) {
|
|
for (int i = 0; i < childCount; i++) {
|
|
View v = getChildAt(i);
|
|
if (y <= v.getBottom()) {
|
|
return mFirstPosition + i;
|
|
}
|
|
}
|
|
} else {
|
|
for (int i = childCount - 1; i >= 0; i--) {
|
|
View v = getChildAt(i);
|
|
if (y >= v.getTop()) {
|
|
return mFirstPosition + i;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return INVALID_POSITION;
|
|
}
|
|
|
|
/**
|
|
* Put a specific item at a specific location on the screen and then build
|
|
* up and down from there.
|
|
*
|
|
* @param position The reference view to use as the starting point
|
|
* @param top Pixel offset from the top of this view to the top of the
|
|
* reference view.
|
|
*
|
|
* @return The selected view, or null if the selected view is outside the
|
|
* visible area.
|
|
*/
|
|
@UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P)
|
|
private View fillSpecific(int position, int top) {
|
|
boolean tempIsSelected = position == mSelectedPosition;
|
|
View temp = makeAndAddView(position, top, true, mListPadding.left, tempIsSelected);
|
|
// Possibly changed again in fillUp if we add rows above this one.
|
|
mFirstPosition = position;
|
|
|
|
View above;
|
|
View below;
|
|
|
|
final int dividerHeight = mDividerHeight;
|
|
if (!mStackFromBottom) {
|
|
above = fillUp(position - 1, temp.getTop() - dividerHeight);
|
|
// This will correct for the top of the first view not touching the top of the list
|
|
adjustViewsUpOrDown();
|
|
below = fillDown(position + 1, temp.getBottom() + dividerHeight);
|
|
int childCount = getChildCount();
|
|
if (childCount > 0) {
|
|
correctTooHigh(childCount);
|
|
}
|
|
} else {
|
|
below = fillDown(position + 1, temp.getBottom() + dividerHeight);
|
|
// This will correct for the bottom of the last view not touching the bottom of the list
|
|
adjustViewsUpOrDown();
|
|
above = fillUp(position - 1, temp.getTop() - dividerHeight);
|
|
int childCount = getChildCount();
|
|
if (childCount > 0) {
|
|
correctTooLow(childCount);
|
|
}
|
|
}
|
|
|
|
if (tempIsSelected) {
|
|
return temp;
|
|
} else if (above != null) {
|
|
return above;
|
|
} else {
|
|
return below;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Check if we have dragged the bottom of the list too high (we have pushed the
|
|
* top element off the top of the screen when we did not need to). Correct by sliding
|
|
* everything back down.
|
|
*
|
|
* @param childCount Number of children
|
|
*/
|
|
@UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P, trackingBug = 115609023)
|
|
private void correctTooHigh(int childCount) {
|
|
// First see if the last item is visible. If it is not, it is OK for the
|
|
// top of the list to be pushed up.
|
|
int lastPosition = mFirstPosition + childCount - 1;
|
|
if (lastPosition == mItemCount - 1 && childCount > 0) {
|
|
|
|
// Get the last child ...
|
|
final View lastChild = getChildAt(childCount - 1);
|
|
|
|
// ... and its bottom edge
|
|
final int lastBottom = lastChild.getBottom();
|
|
|
|
// This is bottom of our drawable area
|
|
final int end = (mBottom - mTop) - mListPadding.bottom;
|
|
|
|
// This is how far the bottom edge of the last view is from the bottom of the
|
|
// drawable area
|
|
int bottomOffset = end - lastBottom;
|
|
View firstChild = getChildAt(0);
|
|
final int firstTop = firstChild.getTop();
|
|
|
|
// Make sure we are 1) Too high, and 2) Either there are more rows above the
|
|
// first row or the first row is scrolled off the top of the drawable area
|
|
if (bottomOffset > 0 && (mFirstPosition > 0 || firstTop < mListPadding.top)) {
|
|
if (mFirstPosition == 0) {
|
|
// Don't pull the top too far down
|
|
bottomOffset = Math.min(bottomOffset, mListPadding.top - firstTop);
|
|
}
|
|
// Move everything down
|
|
offsetChildrenTopAndBottom(bottomOffset);
|
|
if (mFirstPosition > 0) {
|
|
// Fill the gap that was opened above mFirstPosition with more rows, if
|
|
// possible
|
|
fillUp(mFirstPosition - 1, firstChild.getTop() - mDividerHeight);
|
|
// Close up the remaining gap
|
|
adjustViewsUpOrDown();
|
|
}
|
|
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Check if we have dragged the bottom of the list too low (we have pushed the
|
|
* bottom element off the bottom of the screen when we did not need to). Correct by sliding
|
|
* everything back up.
|
|
*
|
|
* @param childCount Number of children
|
|
*/
|
|
@UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P, trackingBug = 115609023)
|
|
private void correctTooLow(int childCount) {
|
|
// First see if the first item is visible. If it is not, it is OK for the
|
|
// bottom of the list to be pushed down.
|
|
if (mFirstPosition == 0 && childCount > 0) {
|
|
|
|
// Get the first child ...
|
|
final View firstChild = getChildAt(0);
|
|
|
|
// ... and its top edge
|
|
final int firstTop = firstChild.getTop();
|
|
|
|
// This is top of our drawable area
|
|
final int start = mListPadding.top;
|
|
|
|
// This is bottom of our drawable area
|
|
final int end = (mBottom - mTop) - mListPadding.bottom;
|
|
|
|
// This is how far the top edge of the first view is from the top of the
|
|
// drawable area
|
|
int topOffset = firstTop - start;
|
|
View lastChild = getChildAt(childCount - 1);
|
|
final int lastBottom = lastChild.getBottom();
|
|
int lastPosition = mFirstPosition + childCount - 1;
|
|
|
|
// Make sure we are 1) Too low, and 2) Either there are more rows below the
|
|
// last row or the last row is scrolled off the bottom of the drawable area
|
|
if (topOffset > 0) {
|
|
if (lastPosition < mItemCount - 1 || lastBottom > end) {
|
|
if (lastPosition == mItemCount - 1) {
|
|
// Don't pull the bottom too far up
|
|
topOffset = Math.min(topOffset, lastBottom - end);
|
|
}
|
|
// Move everything up
|
|
offsetChildrenTopAndBottom(-topOffset);
|
|
if (lastPosition < mItemCount - 1) {
|
|
// Fill the gap that was opened below the last position with more rows, if
|
|
// possible
|
|
fillDown(lastPosition + 1, lastChild.getBottom() + mDividerHeight);
|
|
// Close up the remaining gap
|
|
adjustViewsUpOrDown();
|
|
}
|
|
} else if (lastPosition == mItemCount - 1) {
|
|
adjustViewsUpOrDown();
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
@Override
|
|
protected void layoutChildren() {
|
|
final boolean blockLayoutRequests = mBlockLayoutRequests;
|
|
if (blockLayoutRequests) {
|
|
return;
|
|
}
|
|
|
|
mBlockLayoutRequests = true;
|
|
|
|
try {
|
|
super.layoutChildren();
|
|
|
|
invalidate();
|
|
|
|
if (mAdapter == null) {
|
|
resetList();
|
|
invokeOnItemScrollListener();
|
|
return;
|
|
}
|
|
|
|
final int childrenTop = mListPadding.top;
|
|
final int childrenBottom = mBottom - mTop - mListPadding.bottom;
|
|
final int childCount = getChildCount();
|
|
|
|
int index = 0;
|
|
int delta = 0;
|
|
|
|
View sel;
|
|
View oldSel = null;
|
|
View oldFirst = null;
|
|
View newSel = null;
|
|
|
|
// Remember stuff we will need down below
|
|
switch (mLayoutMode) {
|
|
case LAYOUT_SET_SELECTION:
|
|
index = mNextSelectedPosition - mFirstPosition;
|
|
if (index >= 0 && index < childCount) {
|
|
newSel = getChildAt(index);
|
|
}
|
|
break;
|
|
case LAYOUT_FORCE_TOP:
|
|
case LAYOUT_FORCE_BOTTOM:
|
|
case LAYOUT_SPECIFIC:
|
|
case LAYOUT_SYNC:
|
|
break;
|
|
case LAYOUT_MOVE_SELECTION:
|
|
default:
|
|
// Remember the previously selected view
|
|
index = mSelectedPosition - mFirstPosition;
|
|
if (index >= 0 && index < childCount) {
|
|
oldSel = getChildAt(index);
|
|
}
|
|
|
|
// Remember the previous first child
|
|
oldFirst = getChildAt(0);
|
|
|
|
if (mNextSelectedPosition >= 0) {
|
|
delta = mNextSelectedPosition - mSelectedPosition;
|
|
}
|
|
|
|
// Caution: newSel might be null
|
|
newSel = getChildAt(index + delta);
|
|
}
|
|
|
|
|
|
boolean dataChanged = mDataChanged;
|
|
if (dataChanged) {
|
|
handleDataChanged();
|
|
}
|
|
|
|
// Handle the empty set by removing all views that are visible
|
|
// and calling it a day
|
|
if (mItemCount == 0) {
|
|
resetList();
|
|
invokeOnItemScrollListener();
|
|
return;
|
|
} else if (mItemCount != mAdapter.getCount()) {
|
|
throw new IllegalStateException("The content of the adapter has changed but "
|
|
+ "ListView did not receive a notification. Make sure the content of "
|
|
+ "your adapter is not modified from a background thread, but only from "
|
|
+ "the UI thread. Make sure your adapter calls notifyDataSetChanged() "
|
|
+ "when its content changes. [in ListView(" + getId() + ", " + getClass()
|
|
+ ") with Adapter(" + mAdapter.getClass() + ")]");
|
|
}
|
|
|
|
setSelectedPositionInt(mNextSelectedPosition);
|
|
|
|
AccessibilityNodeInfo accessibilityFocusLayoutRestoreNode = null;
|
|
View accessibilityFocusLayoutRestoreView = null;
|
|
int accessibilityFocusPosition = INVALID_POSITION;
|
|
|
|
// Remember which child, if any, had accessibility focus. This must
|
|
// occur before recycling any views, since that will clear
|
|
// accessibility focus.
|
|
final ViewRootImpl viewRootImpl = getViewRootImpl();
|
|
if (viewRootImpl != null) {
|
|
final View focusHost = viewRootImpl.getAccessibilityFocusedHost();
|
|
if (focusHost != null) {
|
|
final View focusChild = getAccessibilityFocusedChild(focusHost);
|
|
if (focusChild != null) {
|
|
if (!dataChanged || isDirectChildHeaderOrFooter(focusChild)
|
|
|| (focusChild.hasTransientState() && mAdapterHasStableIds)) {
|
|
// The views won't be changing, so try to maintain
|
|
// focus on the current host and virtual view.
|
|
accessibilityFocusLayoutRestoreView = focusHost;
|
|
accessibilityFocusLayoutRestoreNode = viewRootImpl
|
|
.getAccessibilityFocusedVirtualView();
|
|
}
|
|
|
|
// If all else fails, maintain focus at the same
|
|
// position.
|
|
accessibilityFocusPosition = getPositionForView(focusChild);
|
|
}
|
|
}
|
|
}
|
|
|
|
View focusLayoutRestoreDirectChild = null;
|
|
View focusLayoutRestoreView = null;
|
|
|
|
// Take focus back to us temporarily to avoid the eventual call to
|
|
// clear focus when removing the focused child below from messing
|
|
// things up when ViewAncestor assigns focus back to someone else.
|
|
final View focusedChild = getFocusedChild();
|
|
if (focusedChild != null) {
|
|
// TODO: in some cases focusedChild.getParent() == null
|
|
|
|
// We can remember the focused view to restore after re-layout
|
|
// if the data hasn't changed, or if the focused position is a
|
|
// header or footer.
|
|
if (!dataChanged || isDirectChildHeaderOrFooter(focusedChild)
|
|
|| focusedChild.hasTransientState() || mAdapterHasStableIds) {
|
|
focusLayoutRestoreDirectChild = focusedChild;
|
|
// Remember the specific view that had focus.
|
|
focusLayoutRestoreView = findFocus();
|
|
if (focusLayoutRestoreView != null) {
|
|
// Tell it we are going to mess with it.
|
|
focusLayoutRestoreView.dispatchStartTemporaryDetach();
|
|
}
|
|
}
|
|
requestFocus();
|
|
}
|
|
|
|
// Pull all children into the RecycleBin.
|
|
// These views will be reused if possible
|
|
final int firstPosition = mFirstPosition;
|
|
final RecycleBin recycleBin = mRecycler;
|
|
if (dataChanged) {
|
|
for (int i = 0; i < childCount; i++) {
|
|
recycleBin.addScrapView(getChildAt(i), firstPosition+i);
|
|
}
|
|
} else {
|
|
recycleBin.fillActiveViews(childCount, firstPosition);
|
|
}
|
|
|
|
// Clear out old views
|
|
detachAllViewsFromParent();
|
|
recycleBin.removeSkippedScrap();
|
|
|
|
switch (mLayoutMode) {
|
|
case LAYOUT_SET_SELECTION:
|
|
if (newSel != null) {
|
|
sel = fillFromSelection(newSel.getTop(), childrenTop, childrenBottom);
|
|
} else {
|
|
sel = fillFromMiddle(childrenTop, childrenBottom);
|
|
}
|
|
break;
|
|
case LAYOUT_SYNC:
|
|
sel = fillSpecific(mSyncPosition, mSpecificTop);
|
|
break;
|
|
case LAYOUT_FORCE_BOTTOM:
|
|
sel = fillUp(mItemCount - 1, childrenBottom);
|
|
adjustViewsUpOrDown();
|
|
break;
|
|
case LAYOUT_FORCE_TOP:
|
|
mFirstPosition = 0;
|
|
sel = fillFromTop(childrenTop);
|
|
adjustViewsUpOrDown();
|
|
break;
|
|
case LAYOUT_SPECIFIC:
|
|
final int selectedPosition = reconcileSelectedPosition();
|
|
sel = fillSpecific(selectedPosition, mSpecificTop);
|
|
/**
|
|
* When ListView is resized, FocusSelector requests an async selection for the
|
|
* previously focused item to make sure it is still visible. If the item is not
|
|
* selectable, it won't regain focus so instead we call FocusSelector
|
|
* to directly request focus on the view after it is visible.
|
|
*/
|
|
if (sel == null && mFocusSelector != null) {
|
|
final Runnable focusRunnable = mFocusSelector
|
|
.setupFocusIfValid(selectedPosition);
|
|
if (focusRunnable != null) {
|
|
post(focusRunnable);
|
|
}
|
|
}
|
|
break;
|
|
case LAYOUT_MOVE_SELECTION:
|
|
sel = moveSelection(oldSel, newSel, delta, childrenTop, childrenBottom);
|
|
break;
|
|
default:
|
|
if (childCount == 0) {
|
|
if (!mStackFromBottom) {
|
|
final int position = lookForSelectablePosition(0, true);
|
|
setSelectedPositionInt(position);
|
|
sel = fillFromTop(childrenTop);
|
|
} else {
|
|
final int position = lookForSelectablePosition(mItemCount - 1, false);
|
|
setSelectedPositionInt(position);
|
|
sel = fillUp(mItemCount - 1, childrenBottom);
|
|
}
|
|
} else {
|
|
if (mSelectedPosition >= 0 && mSelectedPosition < mItemCount) {
|
|
sel = fillSpecific(mSelectedPosition,
|
|
oldSel == null ? childrenTop : oldSel.getTop());
|
|
} else if (mFirstPosition < mItemCount) {
|
|
sel = fillSpecific(mFirstPosition,
|
|
oldFirst == null ? childrenTop : oldFirst.getTop());
|
|
} else {
|
|
sel = fillSpecific(0, childrenTop);
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
|
|
// Flush any cached views that did not get reused above
|
|
recycleBin.scrapActiveViews();
|
|
|
|
// remove any header/footer that has been temp detached and not re-attached
|
|
removeUnusedFixedViews(mHeaderViewInfos);
|
|
removeUnusedFixedViews(mFooterViewInfos);
|
|
|
|
if (sel != null) {
|
|
// The current selected item should get focus if items are
|
|
// focusable.
|
|
if (mItemsCanFocus && hasFocus() && !sel.hasFocus()) {
|
|
final boolean focusWasTaken = (sel == focusLayoutRestoreDirectChild &&
|
|
focusLayoutRestoreView != null &&
|
|
focusLayoutRestoreView.requestFocus()) || sel.requestFocus();
|
|
if (!focusWasTaken) {
|
|
// Selected item didn't take focus, but we still want to
|
|
// make sure something else outside of the selected view
|
|
// has focus.
|
|
final View focused = getFocusedChild();
|
|
if (focused != null) {
|
|
focused.clearFocus();
|
|
}
|
|
positionSelector(INVALID_POSITION, sel);
|
|
} else {
|
|
sel.setSelected(false);
|
|
mSelectorRect.setEmpty();
|
|
}
|
|
} else {
|
|
positionSelector(INVALID_POSITION, sel);
|
|
}
|
|
mSelectedTop = sel.getTop();
|
|
} else {
|
|
final boolean inTouchMode = mTouchMode == TOUCH_MODE_TAP
|
|
|| mTouchMode == TOUCH_MODE_DONE_WAITING;
|
|
if (inTouchMode) {
|
|
// If the user's finger is down, select the motion position.
|
|
final View child = getChildAt(mMotionPosition - mFirstPosition);
|
|
if (child != null) {
|
|
positionSelector(mMotionPosition, child);
|
|
}
|
|
} else if (mSelectorPosition != INVALID_POSITION) {
|
|
// If we had previously positioned the selector somewhere,
|
|
// put it back there. It might not match up with the data,
|
|
// but it's transitioning out so it's not a big deal.
|
|
final View child = getChildAt(mSelectorPosition - mFirstPosition);
|
|
if (child != null) {
|
|
positionSelector(mSelectorPosition, child);
|
|
}
|
|
} else {
|
|
// Otherwise, clear selection.
|
|
mSelectedTop = 0;
|
|
mSelectorRect.setEmpty();
|
|
}
|
|
|
|
// Even if there is not selected position, we may need to
|
|
// restore focus (i.e. something focusable in touch mode).
|
|
if (hasFocus() && focusLayoutRestoreView != null) {
|
|
focusLayoutRestoreView.requestFocus();
|
|
}
|
|
}
|
|
|
|
// Attempt to restore accessibility focus, if necessary.
|
|
if (viewRootImpl != null) {
|
|
final View newAccessibilityFocusedView = viewRootImpl.getAccessibilityFocusedHost();
|
|
if (newAccessibilityFocusedView == null) {
|
|
if (accessibilityFocusLayoutRestoreView != null
|
|
&& accessibilityFocusLayoutRestoreView.isAttachedToWindow()) {
|
|
final AccessibilityNodeProvider provider =
|
|
accessibilityFocusLayoutRestoreView.getAccessibilityNodeProvider();
|
|
if (accessibilityFocusLayoutRestoreNode != null && provider != null) {
|
|
final int virtualViewId = AccessibilityNodeInfo.getVirtualDescendantId(
|
|
accessibilityFocusLayoutRestoreNode.getSourceNodeId());
|
|
provider.performAction(virtualViewId,
|
|
AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS, null);
|
|
} else {
|
|
accessibilityFocusLayoutRestoreView.requestAccessibilityFocus();
|
|
}
|
|
} else if (accessibilityFocusPosition != INVALID_POSITION) {
|
|
// Bound the position within the visible children.
|
|
final int position = MathUtils.constrain(
|
|
accessibilityFocusPosition - mFirstPosition, 0,
|
|
getChildCount() - 1);
|
|
final View restoreView = getChildAt(position);
|
|
if (restoreView != null) {
|
|
restoreView.requestAccessibilityFocus();
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// Tell focus view we are done mucking with it, if it is still in
|
|
// our view hierarchy.
|
|
if (focusLayoutRestoreView != null
|
|
&& focusLayoutRestoreView.getWindowToken() != null) {
|
|
focusLayoutRestoreView.dispatchFinishTemporaryDetach();
|
|
}
|
|
|
|
mLayoutMode = LAYOUT_NORMAL;
|
|
mDataChanged = false;
|
|
if (mPositionScrollAfterLayout != null) {
|
|
post(mPositionScrollAfterLayout);
|
|
mPositionScrollAfterLayout = null;
|
|
}
|
|
mNeedSync = false;
|
|
setNextSelectedPositionInt(mSelectedPosition);
|
|
|
|
updateScrollIndicators();
|
|
|
|
if (mItemCount > 0) {
|
|
checkSelectionChanged();
|
|
}
|
|
|
|
invokeOnItemScrollListener();
|
|
} finally {
|
|
if (mFocusSelector != null) {
|
|
mFocusSelector.onLayoutComplete();
|
|
}
|
|
if (!blockLayoutRequests) {
|
|
mBlockLayoutRequests = false;
|
|
}
|
|
}
|
|
}
|
|
|
|
@Override
|
|
@UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.R, trackingBug = 170729553)
|
|
boolean trackMotionScroll(int deltaY, int incrementalDeltaY) {
|
|
final boolean result = super.trackMotionScroll(deltaY, incrementalDeltaY);
|
|
removeUnusedFixedViews(mHeaderViewInfos);
|
|
removeUnusedFixedViews(mFooterViewInfos);
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* Header and Footer views are not scrapped / recycled like other views but they are still
|
|
* detached from the ViewGroup. After a layout operation, call this method to remove such views.
|
|
*
|
|
* @param infoList The info list to be traversed
|
|
*/
|
|
private void removeUnusedFixedViews(@Nullable List<FixedViewInfo> infoList) {
|
|
if (infoList == null) {
|
|
return;
|
|
}
|
|
for (int i = infoList.size() - 1; i >= 0; i--) {
|
|
final FixedViewInfo fixedViewInfo = infoList.get(i);
|
|
final View view = fixedViewInfo.view;
|
|
final LayoutParams lp = (LayoutParams) view.getLayoutParams();
|
|
if (view.getParent() == null && lp != null && lp.recycledHeaderFooter) {
|
|
removeDetachedView(view, false);
|
|
lp.recycledHeaderFooter = false;
|
|
}
|
|
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @param child a direct child of this list.
|
|
* @return Whether child is a header or footer view.
|
|
*/
|
|
@UnsupportedAppUsage
|
|
private boolean isDirectChildHeaderOrFooter(View child) {
|
|
final ArrayList<FixedViewInfo> headers = mHeaderViewInfos;
|
|
final int numHeaders = headers.size();
|
|
for (int i = 0; i < numHeaders; i++) {
|
|
if (child == headers.get(i).view) {
|
|
return true;
|
|
}
|
|
}
|
|
|
|
final ArrayList<FixedViewInfo> footers = mFooterViewInfos;
|
|
final int numFooters = footers.size();
|
|
for (int i = 0; i < numFooters; i++) {
|
|
if (child == footers.get(i).view) {
|
|
return true;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Obtains the view and adds it to our list of children. The view can be
|
|
* made fresh, converted from an unused view, or used as is if it was in
|
|
* the recycle bin.
|
|
*
|
|
* @param position logical position in the list
|
|
* @param y top or bottom edge of the view to add
|
|
* @param flow {@code true} to align top edge to y, {@code false} to align
|
|
* bottom edge to y
|
|
* @param childrenLeft left edge where children should be positioned
|
|
* @param selected {@code true} if the position is selected, {@code false}
|
|
* otherwise
|
|
* @return the view that was added
|
|
*/
|
|
@UnsupportedAppUsage
|
|
private View makeAndAddView(int position, int y, boolean flow, int childrenLeft,
|
|
boolean selected) {
|
|
if (!mDataChanged) {
|
|
// Try to use an existing view for this position.
|
|
final View activeView = mRecycler.getActiveView(position);
|
|
if (activeView != null) {
|
|
// Found it. We're reusing an existing child, so it just needs
|
|
// to be positioned like a scrap view.
|
|
setupChild(activeView, position, y, flow, childrenLeft, selected, true);
|
|
return activeView;
|
|
}
|
|
}
|
|
|
|
// Make a new view for this position, or convert an unused view if
|
|
// possible.
|
|
final View child = obtainView(position, mIsScrap);
|
|
|
|
// This needs to be positioned and measured.
|
|
setupChild(child, position, y, flow, childrenLeft, selected, mIsScrap[0]);
|
|
|
|
return child;
|
|
}
|
|
|
|
/**
|
|
* Adds a view as a child and make sure it is measured (if necessary) and
|
|
* positioned properly.
|
|
*
|
|
* @param child the view to add
|
|
* @param position the position of this child
|
|
* @param y the y position relative to which this view will be positioned
|
|
* @param flowDown {@code true} to align top edge to y, {@code false} to
|
|
* align bottom edge to y
|
|
* @param childrenLeft left edge where children should be positioned
|
|
* @param selected {@code true} if the position is selected, {@code false}
|
|
* otherwise
|
|
* @param isAttachedToWindow {@code true} if the view is already attached
|
|
* to the window, e.g. whether it was reused, or
|
|
* {@code false} otherwise
|
|
*/
|
|
private void setupChild(View child, int position, int y, boolean flowDown, int childrenLeft,
|
|
boolean selected, boolean isAttachedToWindow) {
|
|
Trace.traceBegin(Trace.TRACE_TAG_VIEW, "setupListItem");
|
|
|
|
final boolean isSelected = selected && shouldShowSelector();
|
|
final boolean updateChildSelected = isSelected != child.isSelected();
|
|
final int mode = mTouchMode;
|
|
final boolean isPressed = mode > TOUCH_MODE_DOWN && mode < TOUCH_MODE_SCROLL
|
|
&& mMotionPosition == position;
|
|
final boolean updateChildPressed = isPressed != child.isPressed();
|
|
final boolean needToMeasure = !isAttachedToWindow || updateChildSelected
|
|
|| child.isLayoutRequested();
|
|
|
|
// Respect layout params that are already in the view. Otherwise make
|
|
// some up...
|
|
AbsListView.LayoutParams p = (AbsListView.LayoutParams) child.getLayoutParams();
|
|
if (p == null) {
|
|
p = (AbsListView.LayoutParams) generateDefaultLayoutParams();
|
|
}
|
|
p.viewType = mAdapter.getItemViewType(position);
|
|
p.isEnabled = mAdapter.isEnabled(position);
|
|
|
|
// Set up view state before attaching the view, since we may need to
|
|
// rely on the jumpDrawablesToCurrentState() call that occurs as part
|
|
// of view attachment.
|
|
if (updateChildSelected) {
|
|
child.setSelected(isSelected);
|
|
}
|
|
|
|
if (updateChildPressed) {
|
|
child.setPressed(isPressed);
|
|
}
|
|
|
|
if (mChoiceMode != CHOICE_MODE_NONE && mCheckStates != null) {
|
|
if (child instanceof Checkable) {
|
|
((Checkable) child).setChecked(mCheckStates.get(position));
|
|
} else if (getContext().getApplicationInfo().targetSdkVersion
|
|
>= android.os.Build.VERSION_CODES.HONEYCOMB) {
|
|
child.setActivated(mCheckStates.get(position));
|
|
}
|
|
}
|
|
|
|
if ((isAttachedToWindow && !p.forceAdd) || (p.recycledHeaderFooter
|
|
&& p.viewType == AdapterView.ITEM_VIEW_TYPE_HEADER_OR_FOOTER)) {
|
|
attachViewToParent(child, flowDown ? -1 : 0, p);
|
|
|
|
// If the view was previously attached for a different position,
|
|
// then manually jump the drawables.
|
|
if (isAttachedToWindow
|
|
&& (((AbsListView.LayoutParams) child.getLayoutParams()).scrappedFromPosition)
|
|
!= position) {
|
|
child.jumpDrawablesToCurrentState();
|
|
}
|
|
} else {
|
|
p.forceAdd = false;
|
|
if (p.viewType == AdapterView.ITEM_VIEW_TYPE_HEADER_OR_FOOTER) {
|
|
p.recycledHeaderFooter = true;
|
|
}
|
|
addViewInLayout(child, flowDown ? -1 : 0, p, true);
|
|
// add view in layout will reset the RTL properties. We have to re-resolve them
|
|
child.resolveRtlPropertiesIfNeeded();
|
|
}
|
|
|
|
if (needToMeasure) {
|
|
final int childWidthSpec = ViewGroup.getChildMeasureSpec(mWidthMeasureSpec,
|
|
mListPadding.left + mListPadding.right, p.width);
|
|
final int lpHeight = p.height;
|
|
final int childHeightSpec;
|
|
if (lpHeight > 0) {
|
|
childHeightSpec = MeasureSpec.makeMeasureSpec(lpHeight, MeasureSpec.EXACTLY);
|
|
} else {
|
|
childHeightSpec = MeasureSpec.makeSafeMeasureSpec(getMeasuredHeight(),
|
|
MeasureSpec.UNSPECIFIED);
|
|
}
|
|
child.measure(childWidthSpec, childHeightSpec);
|
|
} else {
|
|
cleanupLayoutState(child);
|
|
}
|
|
|
|
final int w = child.getMeasuredWidth();
|
|
final int h = child.getMeasuredHeight();
|
|
final int childTop = flowDown ? y : y - h;
|
|
|
|
if (needToMeasure) {
|
|
final int childRight = childrenLeft + w;
|
|
final int childBottom = childTop + h;
|
|
child.layout(childrenLeft, childTop, childRight, childBottom);
|
|
} else {
|
|
child.offsetLeftAndRight(childrenLeft - child.getLeft());
|
|
child.offsetTopAndBottom(childTop - child.getTop());
|
|
}
|
|
|
|
if (mCachingStarted && !child.isDrawingCacheEnabled()) {
|
|
child.setDrawingCacheEnabled(true);
|
|
}
|
|
|
|
Trace.traceEnd(Trace.TRACE_TAG_VIEW);
|
|
}
|
|
|
|
@Override
|
|
protected boolean canAnimate() {
|
|
return super.canAnimate() && mItemCount > 0;
|
|
}
|
|
|
|
/**
|
|
* Sets the currently selected item. If in touch mode, the item will not be selected
|
|
* but it will still be positioned appropriately. If the specified selection position
|
|
* is less than 0, then the item at position 0 will be selected.
|
|
*
|
|
* @param position Index (starting at 0) of the data item to be selected.
|
|
*/
|
|
@Override
|
|
public void setSelection(int position) {
|
|
setSelectionFromTop(position, 0);
|
|
}
|
|
|
|
/**
|
|
* Makes the item at the supplied position selected.
|
|
*
|
|
* @param position the position of the item to select
|
|
*/
|
|
@Override
|
|
@UnsupportedAppUsage
|
|
void setSelectionInt(int position) {
|
|
setNextSelectedPositionInt(position);
|
|
boolean awakeScrollbars = false;
|
|
|
|
final int selectedPosition = mSelectedPosition;
|
|
|
|
if (selectedPosition >= 0) {
|
|
if (position == selectedPosition - 1) {
|
|
awakeScrollbars = true;
|
|
} else if (position == selectedPosition + 1) {
|
|
awakeScrollbars = true;
|
|
}
|
|
}
|
|
|
|
if (mPositionScroller != null) {
|
|
mPositionScroller.stop();
|
|
}
|
|
|
|
layoutChildren();
|
|
|
|
if (awakeScrollbars) {
|
|
awakenScrollBars();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Find a position that can be selected (i.e., is not a separator).
|
|
*
|
|
* @param position The starting position to look at.
|
|
* @param lookDown Whether to look down for other positions.
|
|
* @return The next selectable position starting at position and then searching either up or
|
|
* down. Returns {@link #INVALID_POSITION} if nothing can be found.
|
|
*/
|
|
@Override
|
|
@UnsupportedAppUsage
|
|
int lookForSelectablePosition(int position, boolean lookDown) {
|
|
final ListAdapter adapter = mAdapter;
|
|
if (adapter == null || isInTouchMode()) {
|
|
return INVALID_POSITION;
|
|
}
|
|
|
|
final int count = adapter.getCount();
|
|
if (!mAreAllItemsSelectable) {
|
|
if (lookDown) {
|
|
position = Math.max(0, position);
|
|
while (position < count && !adapter.isEnabled(position)) {
|
|
position++;
|
|
}
|
|
} else {
|
|
position = Math.min(position, count - 1);
|
|
while (position >= 0 && !adapter.isEnabled(position)) {
|
|
position--;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (position < 0 || position >= count) {
|
|
return INVALID_POSITION;
|
|
}
|
|
|
|
return position;
|
|
}
|
|
|
|
/**
|
|
* Find a position that can be selected (i.e., is not a separator). If there
|
|
* are no selectable positions in the specified direction from the starting
|
|
* position, searches in the opposite direction from the starting position
|
|
* to the current position.
|
|
*
|
|
* @param current the current position
|
|
* @param position the starting position
|
|
* @param lookDown whether to look down for other positions
|
|
* @return the next selectable position, or {@link #INVALID_POSITION} if
|
|
* nothing can be found
|
|
*/
|
|
int lookForSelectablePositionAfter(int current, int position, boolean lookDown) {
|
|
final ListAdapter adapter = mAdapter;
|
|
if (adapter == null || isInTouchMode()) {
|
|
return INVALID_POSITION;
|
|
}
|
|
|
|
// First check after the starting position in the specified direction.
|
|
final int after = lookForSelectablePosition(position, lookDown);
|
|
if (after != INVALID_POSITION) {
|
|
return after;
|
|
}
|
|
|
|
// Then check between the starting position and the current position.
|
|
final int count = adapter.getCount();
|
|
current = MathUtils.constrain(current, -1, count - 1);
|
|
if (lookDown) {
|
|
position = Math.min(position - 1, count - 1);
|
|
while ((position > current) && !adapter.isEnabled(position)) {
|
|
position--;
|
|
}
|
|
if (position <= current) {
|
|
return INVALID_POSITION;
|
|
}
|
|
} else {
|
|
position = Math.max(0, position + 1);
|
|
while ((position < current) && !adapter.isEnabled(position)) {
|
|
position++;
|
|
}
|
|
if (position >= current) {
|
|
return INVALID_POSITION;
|
|
}
|
|
}
|
|
|
|
return position;
|
|
}
|
|
|
|
/**
|
|
* setSelectionAfterHeaderView set the selection to be the first list item
|
|
* after the header views.
|
|
*/
|
|
public void setSelectionAfterHeaderView() {
|
|
final int count = getHeaderViewsCount();
|
|
if (count > 0) {
|
|
mNextSelectedPosition = 0;
|
|
return;
|
|
}
|
|
|
|
if (mAdapter != null) {
|
|
setSelection(count);
|
|
} else {
|
|
mNextSelectedPosition = count;
|
|
mLayoutMode = LAYOUT_SET_SELECTION;
|
|
}
|
|
|
|
}
|
|
|
|
@Override
|
|
public boolean dispatchKeyEvent(KeyEvent event) {
|
|
// Dispatch in the normal way
|
|
boolean handled = super.dispatchKeyEvent(event);
|
|
if (!handled) {
|
|
// If we didn't handle it...
|
|
View focused = getFocusedChild();
|
|
if (focused != null && event.getAction() == KeyEvent.ACTION_DOWN) {
|
|
// ... and our focused child didn't handle it
|
|
// ... give it to ourselves so we can scroll if necessary
|
|
handled = onKeyDown(event.getKeyCode(), event);
|
|
}
|
|
}
|
|
return handled;
|
|
}
|
|
|
|
@Override
|
|
public boolean onKeyDown(int keyCode, KeyEvent event) {
|
|
return commonKey(keyCode, 1, event);
|
|
}
|
|
|
|
@Override
|
|
public boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event) {
|
|
return commonKey(keyCode, repeatCount, event);
|
|
}
|
|
|
|
@Override
|
|
public boolean onKeyUp(int keyCode, KeyEvent event) {
|
|
return commonKey(keyCode, 1, event);
|
|
}
|
|
|
|
private boolean commonKey(int keyCode, int count, KeyEvent event) {
|
|
if (mAdapter == null || !isAttachedToWindow()) {
|
|
return false;
|
|
}
|
|
|
|
if (mDataChanged) {
|
|
layoutChildren();
|
|
}
|
|
|
|
boolean handled = false;
|
|
int action = event.getAction();
|
|
if (KeyEvent.isConfirmKey(keyCode)
|
|
&& event.hasNoModifiers() && action != KeyEvent.ACTION_UP) {
|
|
handled = resurrectSelectionIfNeeded();
|
|
if (!handled && event.getRepeatCount() == 0 && getChildCount() > 0) {
|
|
keyPressed();
|
|
handled = true;
|
|
}
|
|
}
|
|
|
|
|
|
if (!handled && action != KeyEvent.ACTION_UP) {
|
|
switch (keyCode) {
|
|
case KeyEvent.KEYCODE_DPAD_UP:
|
|
if (event.hasNoModifiers()) {
|
|
handled = resurrectSelectionIfNeeded();
|
|
if (!handled) {
|
|
while (count-- > 0) {
|
|
if (arrowScroll(FOCUS_UP)) {
|
|
handled = true;
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
} else if (event.hasModifiers(KeyEvent.META_ALT_ON)) {
|
|
handled = resurrectSelectionIfNeeded() || fullScroll(FOCUS_UP);
|
|
}
|
|
break;
|
|
|
|
case KeyEvent.KEYCODE_DPAD_DOWN:
|
|
if (event.hasNoModifiers()) {
|
|
handled = resurrectSelectionIfNeeded();
|
|
if (!handled) {
|
|
while (count-- > 0) {
|
|
if (arrowScroll(FOCUS_DOWN)) {
|
|
handled = true;
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
} else if (event.hasModifiers(KeyEvent.META_ALT_ON)) {
|
|
handled = resurrectSelectionIfNeeded() || fullScroll(FOCUS_DOWN);
|
|
}
|
|
break;
|
|
|
|
case KeyEvent.KEYCODE_DPAD_LEFT:
|
|
if (event.hasNoModifiers()) {
|
|
handled = handleHorizontalFocusWithinListItem(View.FOCUS_LEFT);
|
|
}
|
|
break;
|
|
|
|
case KeyEvent.KEYCODE_DPAD_RIGHT:
|
|
if (event.hasNoModifiers()) {
|
|
handled = handleHorizontalFocusWithinListItem(View.FOCUS_RIGHT);
|
|
}
|
|
break;
|
|
|
|
case KeyEvent.KEYCODE_PAGE_UP:
|
|
if (event.hasNoModifiers()) {
|
|
handled = resurrectSelectionIfNeeded() || pageScroll(FOCUS_UP);
|
|
} else if (event.hasModifiers(KeyEvent.META_ALT_ON)) {
|
|
handled = resurrectSelectionIfNeeded() || fullScroll(FOCUS_UP);
|
|
}
|
|
break;
|
|
|
|
case KeyEvent.KEYCODE_PAGE_DOWN:
|
|
if (event.hasNoModifiers()) {
|
|
handled = resurrectSelectionIfNeeded() || pageScroll(FOCUS_DOWN);
|
|
} else if (event.hasModifiers(KeyEvent.META_ALT_ON)) {
|
|
handled = resurrectSelectionIfNeeded() || fullScroll(FOCUS_DOWN);
|
|
}
|
|
break;
|
|
|
|
case KeyEvent.KEYCODE_MOVE_HOME:
|
|
if (event.hasNoModifiers()) {
|
|
handled = resurrectSelectionIfNeeded() || fullScroll(FOCUS_UP);
|
|
}
|
|
break;
|
|
|
|
case KeyEvent.KEYCODE_MOVE_END:
|
|
if (event.hasNoModifiers()) {
|
|
handled = resurrectSelectionIfNeeded() || fullScroll(FOCUS_DOWN);
|
|
}
|
|
break;
|
|
|
|
case KeyEvent.KEYCODE_TAB:
|
|
// This creates an asymmetry in TAB navigation order. At some
|
|
// point in the future we may decide that it's preferable to
|
|
// force the list selection to the top or bottom when receiving
|
|
// TAB focus from another widget, but for now this is adequate.
|
|
if (event.hasNoModifiers()) {
|
|
handled = resurrectSelectionIfNeeded() || arrowScroll(FOCUS_DOWN);
|
|
} else if (event.hasModifiers(KeyEvent.META_SHIFT_ON)) {
|
|
handled = resurrectSelectionIfNeeded() || arrowScroll(FOCUS_UP);
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (handled) {
|
|
return true;
|
|
}
|
|
|
|
if (sendToTextFilter(keyCode, count, event)) {
|
|
return true;
|
|
}
|
|
|
|
switch (action) {
|
|
case KeyEvent.ACTION_DOWN:
|
|
return super.onKeyDown(keyCode, event);
|
|
|
|
case KeyEvent.ACTION_UP:
|
|
return super.onKeyUp(keyCode, event);
|
|
|
|
case KeyEvent.ACTION_MULTIPLE:
|
|
return super.onKeyMultiple(keyCode, count, event);
|
|
|
|
default: // shouldn't happen
|
|
return false;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Scrolls up or down by the number of items currently present on screen.
|
|
*
|
|
* @param direction either {@link View#FOCUS_UP} or {@link View#FOCUS_DOWN}
|
|
* @return whether selection was moved
|
|
*/
|
|
boolean pageScroll(int direction) {
|
|
final int nextPage;
|
|
final boolean down;
|
|
|
|
if (direction == FOCUS_UP) {
|
|
nextPage = Math.max(0, mSelectedPosition - getChildCount() - 1);
|
|
down = false;
|
|
} else if (direction == FOCUS_DOWN) {
|
|
nextPage = Math.min(mItemCount - 1, mSelectedPosition + getChildCount() - 1);
|
|
down = true;
|
|
} else {
|
|
return false;
|
|
}
|
|
|
|
if (nextPage >= 0) {
|
|
final int position = lookForSelectablePositionAfter(mSelectedPosition, nextPage, down);
|
|
if (position >= 0) {
|
|
mLayoutMode = LAYOUT_SPECIFIC;
|
|
mSpecificTop = mPaddingTop + getVerticalFadingEdgeLength();
|
|
|
|
if (down && (position > (mItemCount - getChildCount()))) {
|
|
mLayoutMode = LAYOUT_FORCE_BOTTOM;
|
|
}
|
|
|
|
if (!down && (position < getChildCount())) {
|
|
mLayoutMode = LAYOUT_FORCE_TOP;
|
|
}
|
|
|
|
setSelectionInt(position);
|
|
invokeOnItemScrollListener();
|
|
if (!awakenScrollBars()) {
|
|
invalidate();
|
|
}
|
|
|
|
return true;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Go to the last or first item if possible (not worrying about panning
|
|
* across or navigating within the internal focus of the currently selected
|
|
* item.)
|
|
*
|
|
* @param direction either {@link View#FOCUS_UP} or {@link View#FOCUS_DOWN}
|
|
* @return whether selection was moved
|
|
*/
|
|
boolean fullScroll(int direction) {
|
|
boolean moved = false;
|
|
if (direction == FOCUS_UP) {
|
|
if (mSelectedPosition != 0) {
|
|
final int position = lookForSelectablePositionAfter(mSelectedPosition, 0, true);
|
|
if (position >= 0) {
|
|
mLayoutMode = LAYOUT_FORCE_TOP;
|
|
setSelectionInt(position);
|
|
invokeOnItemScrollListener();
|
|
}
|
|
moved = true;
|
|
}
|
|
} else if (direction == FOCUS_DOWN) {
|
|
final int lastItem = (mItemCount - 1);
|
|
if (mSelectedPosition < lastItem) {
|
|
final int position = lookForSelectablePositionAfter(
|
|
mSelectedPosition, lastItem, false);
|
|
if (position >= 0) {
|
|
mLayoutMode = LAYOUT_FORCE_BOTTOM;
|
|
setSelectionInt(position);
|
|
invokeOnItemScrollListener();
|
|
}
|
|
moved = true;
|
|
}
|
|
}
|
|
|
|
if (moved && !awakenScrollBars()) {
|
|
awakenScrollBars();
|
|
invalidate();
|
|
}
|
|
|
|
return moved;
|
|
}
|
|
|
|
/**
|
|
* To avoid horizontal focus searches changing the selected item, we
|
|
* manually focus search within the selected item (as applicable), and
|
|
* prevent focus from jumping to something within another item.
|
|
* @param direction one of {View.FOCUS_LEFT, View.FOCUS_RIGHT}
|
|
* @return Whether this consumes the key event.
|
|
*/
|
|
private boolean handleHorizontalFocusWithinListItem(int direction) {
|
|
if (direction != View.FOCUS_LEFT && direction != View.FOCUS_RIGHT) {
|
|
throw new IllegalArgumentException("direction must be one of"
|
|
+ " {View.FOCUS_LEFT, View.FOCUS_RIGHT}");
|
|
}
|
|
|
|
final int numChildren = getChildCount();
|
|
if (mItemsCanFocus && numChildren > 0 && mSelectedPosition != INVALID_POSITION) {
|
|
final View selectedView = getSelectedView();
|
|
if (selectedView != null && selectedView.hasFocus() &&
|
|
selectedView instanceof ViewGroup) {
|
|
|
|
final View currentFocus = selectedView.findFocus();
|
|
final View nextFocus = FocusFinder.getInstance().findNextFocus(
|
|
(ViewGroup) selectedView, currentFocus, direction);
|
|
if (nextFocus != null) {
|
|
// do the math to get interesting rect in next focus' coordinates
|
|
Rect focusedRect = mTempRect;
|
|
if (currentFocus != null) {
|
|
currentFocus.getFocusedRect(focusedRect);
|
|
offsetDescendantRectToMyCoords(currentFocus, focusedRect);
|
|
offsetRectIntoDescendantCoords(nextFocus, focusedRect);
|
|
} else {
|
|
focusedRect = null;
|
|
}
|
|
if (nextFocus.requestFocus(direction, focusedRect)) {
|
|
return true;
|
|
}
|
|
}
|
|
// we are blocking the key from being handled (by returning true)
|
|
// if the global result is going to be some other view within this
|
|
// list. this is to acheive the overall goal of having
|
|
// horizontal d-pad navigation remain in the current item.
|
|
final View globalNextFocus = FocusFinder.getInstance().findNextFocus(
|
|
(ViewGroup) getRootView(), currentFocus, direction);
|
|
if (globalNextFocus != null) {
|
|
return isViewAncestorOf(globalNextFocus, this);
|
|
}
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Scrolls to the next or previous item if possible.
|
|
*
|
|
* @param direction either {@link View#FOCUS_UP} or {@link View#FOCUS_DOWN}
|
|
*
|
|
* @return whether selection was moved
|
|
*/
|
|
@UnsupportedAppUsage
|
|
boolean arrowScroll(int direction) {
|
|
try {
|
|
mInLayout = true;
|
|
final boolean handled = arrowScrollImpl(direction);
|
|
if (handled) {
|
|
playSoundEffect(SoundEffectConstants.getContantForFocusDirection(direction));
|
|
}
|
|
return handled;
|
|
} finally {
|
|
mInLayout = false;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Used by {@link #arrowScrollImpl(int)} to help determine the next selected position
|
|
* to move to. This return a position in the direction given if the selected item
|
|
* is fully visible.
|
|
*
|
|
* @param selectedView Current selected view to move from
|
|
* @param selectedPos Current selected position to move from
|
|
* @param direction Direction to move in
|
|
* @return Desired selected position after moving in the given direction
|
|
*/
|
|
private final int nextSelectedPositionForDirection(
|
|
View selectedView, int selectedPos, int direction) {
|
|
int nextSelected;
|
|
|
|
if (direction == View.FOCUS_DOWN) {
|
|
final int listBottom = getHeight() - mListPadding.bottom;
|
|
if (selectedView != null && selectedView.getBottom() <= listBottom) {
|
|
nextSelected = selectedPos != INVALID_POSITION && selectedPos >= mFirstPosition ?
|
|
selectedPos + 1 :
|
|
mFirstPosition;
|
|
} else {
|
|
return INVALID_POSITION;
|
|
}
|
|
} else {
|
|
final int listTop = mListPadding.top;
|
|
if (selectedView != null && selectedView.getTop() >= listTop) {
|
|
final int lastPos = mFirstPosition + getChildCount() - 1;
|
|
nextSelected = selectedPos != INVALID_POSITION && selectedPos <= lastPos ?
|
|
selectedPos - 1 :
|
|
lastPos;
|
|
} else {
|
|
return INVALID_POSITION;
|
|
}
|
|
}
|
|
|
|
if (nextSelected < 0 || nextSelected >= mAdapter.getCount()) {
|
|
return INVALID_POSITION;
|
|
}
|
|
return lookForSelectablePosition(nextSelected, direction == View.FOCUS_DOWN);
|
|
}
|
|
|
|
/**
|
|
* Handle an arrow scroll going up or down. Take into account whether items are selectable,
|
|
* whether there are focusable items etc.
|
|
*
|
|
* @param direction Either {@link android.view.View#FOCUS_UP} or {@link android.view.View#FOCUS_DOWN}.
|
|
* @return Whether any scrolling, selection or focus change occured.
|
|
*/
|
|
private boolean arrowScrollImpl(int direction) {
|
|
if (getChildCount() <= 0) {
|
|
return false;
|
|
}
|
|
|
|
View selectedView = getSelectedView();
|
|
int selectedPos = mSelectedPosition;
|
|
|
|
int nextSelectedPosition = nextSelectedPositionForDirection(selectedView, selectedPos, direction);
|
|
int amountToScroll = amountToScroll(direction, nextSelectedPosition);
|
|
|
|
// if we are moving focus, we may OVERRIDE the default behavior
|
|
final ArrowScrollFocusResult focusResult = mItemsCanFocus ? arrowScrollFocused(direction) : null;
|
|
if (focusResult != null) {
|
|
nextSelectedPosition = focusResult.getSelectedPosition();
|
|
amountToScroll = focusResult.getAmountToScroll();
|
|
}
|
|
|
|
boolean needToRedraw = focusResult != null;
|
|
if (nextSelectedPosition != INVALID_POSITION) {
|
|
handleNewSelectionChange(selectedView, direction, nextSelectedPosition, focusResult != null);
|
|
setSelectedPositionInt(nextSelectedPosition);
|
|
setNextSelectedPositionInt(nextSelectedPosition);
|
|
selectedView = getSelectedView();
|
|
selectedPos = nextSelectedPosition;
|
|
if (mItemsCanFocus && focusResult == null) {
|
|
// there was no new view found to take focus, make sure we
|
|
// don't leave focus with the old selection
|
|
final View focused = getFocusedChild();
|
|
if (focused != null) {
|
|
focused.clearFocus();
|
|
}
|
|
}
|
|
needToRedraw = true;
|
|
checkSelectionChanged();
|
|
}
|
|
|
|
if (amountToScroll > 0) {
|
|
scrollListItemsBy((direction == View.FOCUS_UP) ? amountToScroll : -amountToScroll);
|
|
needToRedraw = true;
|
|
}
|
|
|
|
// if we didn't find a new focusable, make sure any existing focused
|
|
// item that was panned off screen gives up focus.
|
|
if (mItemsCanFocus && (focusResult == null)
|
|
&& selectedView != null && selectedView.hasFocus()) {
|
|
final View focused = selectedView.findFocus();
|
|
if (focused != null) {
|
|
if (!isViewAncestorOf(focused, this) || distanceToView(focused) > 0) {
|
|
focused.clearFocus();
|
|
}
|
|
}
|
|
}
|
|
|
|
// if the current selection is panned off, we need to remove the selection
|
|
if (nextSelectedPosition == INVALID_POSITION && selectedView != null
|
|
&& !isViewAncestorOf(selectedView, this)) {
|
|
selectedView = null;
|
|
hideSelector();
|
|
|
|
// but we don't want to set the ressurect position (that would make subsequent
|
|
// unhandled key events bring back the item we just scrolled off!)
|
|
mResurrectToPosition = INVALID_POSITION;
|
|
}
|
|
|
|
if (needToRedraw) {
|
|
if (selectedView != null) {
|
|
positionSelectorLikeFocus(selectedPos, selectedView);
|
|
mSelectedTop = selectedView.getTop();
|
|
}
|
|
if (!awakenScrollBars()) {
|
|
invalidate();
|
|
}
|
|
invokeOnItemScrollListener();
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* When selection changes, it is possible that the previously selected or the
|
|
* next selected item will change its size. If so, we need to offset some folks,
|
|
* and re-layout the items as appropriate.
|
|
*
|
|
* @param selectedView The currently selected view (before changing selection).
|
|
* should be <code>null</code> if there was no previous selection.
|
|
* @param direction Either {@link android.view.View#FOCUS_UP} or
|
|
* {@link android.view.View#FOCUS_DOWN}.
|
|
* @param newSelectedPosition The position of the next selection.
|
|
* @param newFocusAssigned whether new focus was assigned. This matters because
|
|
* when something has focus, we don't want to show selection (ugh).
|
|
*/
|
|
private void handleNewSelectionChange(View selectedView, int direction, int newSelectedPosition,
|
|
boolean newFocusAssigned) {
|
|
if (newSelectedPosition == INVALID_POSITION) {
|
|
throw new IllegalArgumentException("newSelectedPosition needs to be valid");
|
|
}
|
|
|
|
// whether or not we are moving down or up, we want to preserve the
|
|
// top of whatever view is on top:
|
|
// - moving down: the view that had selection
|
|
// - moving up: the view that is getting selection
|
|
View topView;
|
|
View bottomView;
|
|
int topViewIndex, bottomViewIndex;
|
|
boolean topSelected = false;
|
|
final int selectedIndex = mSelectedPosition - mFirstPosition;
|
|
final int nextSelectedIndex = newSelectedPosition - mFirstPosition;
|
|
if (direction == View.FOCUS_UP) {
|
|
topViewIndex = nextSelectedIndex;
|
|
bottomViewIndex = selectedIndex;
|
|
topView = getChildAt(topViewIndex);
|
|
bottomView = selectedView;
|
|
topSelected = true;
|
|
} else {
|
|
topViewIndex = selectedIndex;
|
|
bottomViewIndex = nextSelectedIndex;
|
|
topView = selectedView;
|
|
bottomView = getChildAt(bottomViewIndex);
|
|
}
|
|
|
|
final int numChildren = getChildCount();
|
|
|
|
// start with top view: is it changing size?
|
|
if (topView != null) {
|
|
topView.setSelected(!newFocusAssigned && topSelected);
|
|
measureAndAdjustDown(topView, topViewIndex, numChildren);
|
|
}
|
|
|
|
// is the bottom view changing size?
|
|
if (bottomView != null) {
|
|
bottomView.setSelected(!newFocusAssigned && !topSelected);
|
|
measureAndAdjustDown(bottomView, bottomViewIndex, numChildren);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Re-measure a child, and if its height changes, lay it out preserving its
|
|
* top, and adjust the children below it appropriately.
|
|
* @param child The child
|
|
* @param childIndex The view group index of the child.
|
|
* @param numChildren The number of children in the view group.
|
|
*/
|
|
private void measureAndAdjustDown(View child, int childIndex, int numChildren) {
|
|
int oldHeight = child.getHeight();
|
|
measureItem(child);
|
|
if (child.getMeasuredHeight() != oldHeight) {
|
|
// lay out the view, preserving its top
|
|
relayoutMeasuredItem(child);
|
|
|
|
// adjust views below appropriately
|
|
final int heightDelta = child.getMeasuredHeight() - oldHeight;
|
|
for (int i = childIndex + 1; i < numChildren; i++) {
|
|
getChildAt(i).offsetTopAndBottom(heightDelta);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Measure a particular list child.
|
|
* TODO: unify with setUpChild.
|
|
* @param child The child.
|
|
*/
|
|
private void measureItem(View child) {
|
|
ViewGroup.LayoutParams p = child.getLayoutParams();
|
|
if (p == null) {
|
|
p = new ViewGroup.LayoutParams(
|
|
ViewGroup.LayoutParams.MATCH_PARENT,
|
|
ViewGroup.LayoutParams.WRAP_CONTENT);
|
|
}
|
|
|
|
int childWidthSpec = ViewGroup.getChildMeasureSpec(mWidthMeasureSpec,
|
|
mListPadding.left + mListPadding.right, p.width);
|
|
int lpHeight = p.height;
|
|
int childHeightSpec;
|
|
if (lpHeight > 0) {
|
|
childHeightSpec = MeasureSpec.makeMeasureSpec(lpHeight, MeasureSpec.EXACTLY);
|
|
} else {
|
|
childHeightSpec = MeasureSpec.makeSafeMeasureSpec(getMeasuredHeight(),
|
|
MeasureSpec.UNSPECIFIED);
|
|
}
|
|
child.measure(childWidthSpec, childHeightSpec);
|
|
}
|
|
|
|
/**
|
|
* Layout a child that has been measured, preserving its top position.
|
|
* TODO: unify with setUpChild.
|
|
* @param child The child.
|
|
*/
|
|
private void relayoutMeasuredItem(View child) {
|
|
final int w = child.getMeasuredWidth();
|
|
final int h = child.getMeasuredHeight();
|
|
final int childLeft = mListPadding.left;
|
|
final int childRight = childLeft + w;
|
|
final int childTop = child.getTop();
|
|
final int childBottom = childTop + h;
|
|
child.layout(childLeft, childTop, childRight, childBottom);
|
|
}
|
|
|
|
/**
|
|
* @return The amount to preview next items when arrow srolling.
|
|
*/
|
|
private int getArrowScrollPreviewLength() {
|
|
return Math.max(MIN_SCROLL_PREVIEW_PIXELS, getVerticalFadingEdgeLength());
|
|
}
|
|
|
|
/**
|
|
* Determine how much we need to scroll in order to get the next selected view
|
|
* visible, with a fading edge showing below as applicable. The amount is
|
|
* capped at {@link #getMaxScrollAmount()} .
|
|
*
|
|
* @param direction either {@link android.view.View#FOCUS_UP} or
|
|
* {@link android.view.View#FOCUS_DOWN}.
|
|
* @param nextSelectedPosition The position of the next selection, or
|
|
* {@link #INVALID_POSITION} if there is no next selectable position
|
|
* @return The amount to scroll. Note: this is always positive! Direction
|
|
* needs to be taken into account when actually scrolling.
|
|
*/
|
|
private int amountToScroll(int direction, int nextSelectedPosition) {
|
|
final int listBottom = getHeight() - mListPadding.bottom;
|
|
final int listTop = mListPadding.top;
|
|
|
|
int numChildren = getChildCount();
|
|
|
|
if (direction == View.FOCUS_DOWN) {
|
|
int indexToMakeVisible = numChildren - 1;
|
|
if (nextSelectedPosition != INVALID_POSITION) {
|
|
indexToMakeVisible = nextSelectedPosition - mFirstPosition;
|
|
}
|
|
while (numChildren <= indexToMakeVisible) {
|
|
// Child to view is not attached yet.
|
|
addViewBelow(getChildAt(numChildren - 1), mFirstPosition + numChildren - 1);
|
|
numChildren++;
|
|
}
|
|
final int positionToMakeVisible = mFirstPosition + indexToMakeVisible;
|
|
final View viewToMakeVisible = getChildAt(indexToMakeVisible);
|
|
|
|
int goalBottom = listBottom;
|
|
if (positionToMakeVisible < mItemCount - 1) {
|
|
goalBottom -= getArrowScrollPreviewLength();
|
|
}
|
|
|
|
if (viewToMakeVisible.getBottom() <= goalBottom) {
|
|
// item is fully visible.
|
|
return 0;
|
|
}
|
|
|
|
if (nextSelectedPosition != INVALID_POSITION
|
|
&& (goalBottom - viewToMakeVisible.getTop()) >= getMaxScrollAmount()) {
|
|
// item already has enough of it visible, changing selection is good enough
|
|
return 0;
|
|
}
|
|
|
|
int amountToScroll = (viewToMakeVisible.getBottom() - goalBottom);
|
|
|
|
if ((mFirstPosition + numChildren) == mItemCount) {
|
|
// last is last in list -> make sure we don't scroll past it
|
|
final int max = getChildAt(numChildren - 1).getBottom() - listBottom;
|
|
amountToScroll = Math.min(amountToScroll, max);
|
|
}
|
|
|
|
return Math.min(amountToScroll, getMaxScrollAmount());
|
|
} else {
|
|
int indexToMakeVisible = 0;
|
|
if (nextSelectedPosition != INVALID_POSITION) {
|
|
indexToMakeVisible = nextSelectedPosition - mFirstPosition;
|
|
}
|
|
while (indexToMakeVisible < 0) {
|
|
// Child to view is not attached yet.
|
|
addViewAbove(getChildAt(0), mFirstPosition);
|
|
mFirstPosition--;
|
|
indexToMakeVisible = nextSelectedPosition - mFirstPosition;
|
|
}
|
|
final int positionToMakeVisible = mFirstPosition + indexToMakeVisible;
|
|
final View viewToMakeVisible = getChildAt(indexToMakeVisible);
|
|
int goalTop = listTop;
|
|
if (positionToMakeVisible > 0) {
|
|
goalTop += getArrowScrollPreviewLength();
|
|
}
|
|
if (viewToMakeVisible.getTop() >= goalTop) {
|
|
// item is fully visible.
|
|
return 0;
|
|
}
|
|
|
|
if (nextSelectedPosition != INVALID_POSITION &&
|
|
(viewToMakeVisible.getBottom() - goalTop) >= getMaxScrollAmount()) {
|
|
// item already has enough of it visible, changing selection is good enough
|
|
return 0;
|
|
}
|
|
|
|
int amountToScroll = (goalTop - viewToMakeVisible.getTop());
|
|
if (mFirstPosition == 0) {
|
|
// first is first in list -> make sure we don't scroll past it
|
|
final int max = listTop - getChildAt(0).getTop();
|
|
amountToScroll = Math.min(amountToScroll, max);
|
|
}
|
|
return Math.min(amountToScroll, getMaxScrollAmount());
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Holds results of focus aware arrow scrolling.
|
|
*/
|
|
static private class ArrowScrollFocusResult {
|
|
private int mSelectedPosition;
|
|
private int mAmountToScroll;
|
|
|
|
/**
|
|
* How {@link android.widget.ListView#arrowScrollFocused} returns its values.
|
|
*/
|
|
void populate(int selectedPosition, int amountToScroll) {
|
|
mSelectedPosition = selectedPosition;
|
|
mAmountToScroll = amountToScroll;
|
|
}
|
|
|
|
public int getSelectedPosition() {
|
|
return mSelectedPosition;
|
|
}
|
|
|
|
public int getAmountToScroll() {
|
|
return mAmountToScroll;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @param direction either {@link android.view.View#FOCUS_UP} or
|
|
* {@link android.view.View#FOCUS_DOWN}.
|
|
* @return The position of the next selectable position of the views that
|
|
* are currently visible, taking into account the fact that there might
|
|
* be no selection. Returns {@link #INVALID_POSITION} if there is no
|
|
* selectable view on screen in the given direction.
|
|
*/
|
|
private int lookForSelectablePositionOnScreen(int direction) {
|
|
final int firstPosition = mFirstPosition;
|
|
if (direction == View.FOCUS_DOWN) {
|
|
int startPos = (mSelectedPosition != INVALID_POSITION) ?
|
|
mSelectedPosition + 1 :
|
|
firstPosition;
|
|
if (startPos >= mAdapter.getCount()) {
|
|
return INVALID_POSITION;
|
|
}
|
|
if (startPos < firstPosition) {
|
|
startPos = firstPosition;
|
|
}
|
|
|
|
final int lastVisiblePos = getLastVisiblePosition();
|
|
final ListAdapter adapter = getAdapter();
|
|
for (int pos = startPos; pos <= lastVisiblePos; pos++) {
|
|
if (adapter.isEnabled(pos)
|
|
&& getChildAt(pos - firstPosition).getVisibility() == View.VISIBLE) {
|
|
return pos;
|
|
}
|
|
}
|
|
} else {
|
|
int last = firstPosition + getChildCount() - 1;
|
|
int startPos = (mSelectedPosition != INVALID_POSITION) ?
|
|
mSelectedPosition - 1 :
|
|
firstPosition + getChildCount() - 1;
|
|
if (startPos < 0 || startPos >= mAdapter.getCount()) {
|
|
return INVALID_POSITION;
|
|
}
|
|
if (startPos > last) {
|
|
startPos = last;
|
|
}
|
|
|
|
final ListAdapter adapter = getAdapter();
|
|
for (int pos = startPos; pos >= firstPosition; pos--) {
|
|
if (adapter.isEnabled(pos)
|
|
&& getChildAt(pos - firstPosition).getVisibility() == View.VISIBLE) {
|
|
return pos;
|
|
}
|
|
}
|
|
}
|
|
return INVALID_POSITION;
|
|
}
|
|
|
|
/**
|
|
* Do an arrow scroll based on focus searching. If a new view is
|
|
* given focus, return the selection delta and amount to scroll via
|
|
* an {@link ArrowScrollFocusResult}, otherwise, return null.
|
|
*
|
|
* @param direction either {@link android.view.View#FOCUS_UP} or
|
|
* {@link android.view.View#FOCUS_DOWN}.
|
|
* @return The result if focus has changed, or <code>null</code>.
|
|
*/
|
|
private ArrowScrollFocusResult arrowScrollFocused(final int direction) {
|
|
final View selectedView = getSelectedView();
|
|
View newFocus;
|
|
if (selectedView != null && selectedView.hasFocus()) {
|
|
View oldFocus = selectedView.findFocus();
|
|
newFocus = FocusFinder.getInstance().findNextFocus(this, oldFocus, direction);
|
|
} else {
|
|
if (direction == View.FOCUS_DOWN) {
|
|
final boolean topFadingEdgeShowing = (mFirstPosition > 0);
|
|
final int listTop = mListPadding.top +
|
|
(topFadingEdgeShowing ? getArrowScrollPreviewLength() : 0);
|
|
final int ySearchPoint =
|
|
(selectedView != null && selectedView.getTop() > listTop) ?
|
|
selectedView.getTop() :
|
|
listTop;
|
|
mTempRect.set(0, ySearchPoint, 0, ySearchPoint);
|
|
} else {
|
|
final boolean bottomFadingEdgeShowing =
|
|
(mFirstPosition + getChildCount() - 1) < mItemCount;
|
|
final int listBottom = getHeight() - mListPadding.bottom -
|
|
(bottomFadingEdgeShowing ? getArrowScrollPreviewLength() : 0);
|
|
final int ySearchPoint =
|
|
(selectedView != null && selectedView.getBottom() < listBottom) ?
|
|
selectedView.getBottom() :
|
|
listBottom;
|
|
mTempRect.set(0, ySearchPoint, 0, ySearchPoint);
|
|
}
|
|
newFocus = FocusFinder.getInstance().findNextFocusFromRect(this, mTempRect, direction);
|
|
}
|
|
|
|
if (newFocus != null) {
|
|
final int positionOfNewFocus = positionOfNewFocus(newFocus);
|
|
|
|
// if the focus change is in a different new position, make sure
|
|
// we aren't jumping over another selectable position
|
|
if (mSelectedPosition != INVALID_POSITION && positionOfNewFocus != mSelectedPosition) {
|
|
final int selectablePosition = lookForSelectablePositionOnScreen(direction);
|
|
if (selectablePosition != INVALID_POSITION &&
|
|
((direction == View.FOCUS_DOWN && selectablePosition < positionOfNewFocus) ||
|
|
(direction == View.FOCUS_UP && selectablePosition > positionOfNewFocus))) {
|
|
return null;
|
|
}
|
|
}
|
|
|
|
int focusScroll = amountToScrollToNewFocus(direction, newFocus, positionOfNewFocus);
|
|
|
|
final int maxScrollAmount = getMaxScrollAmount();
|
|
if (focusScroll < maxScrollAmount) {
|
|
// not moving too far, safe to give next view focus
|
|
newFocus.requestFocus(direction);
|
|
mArrowScrollFocusResult.populate(positionOfNewFocus, focusScroll);
|
|
return mArrowScrollFocusResult;
|
|
} else if (distanceToView(newFocus) < maxScrollAmount){
|
|
// Case to consider:
|
|
// too far to get entire next focusable on screen, but by going
|
|
// max scroll amount, we are getting it at least partially in view,
|
|
// so give it focus and scroll the max ammount.
|
|
newFocus.requestFocus(direction);
|
|
mArrowScrollFocusResult.populate(positionOfNewFocus, maxScrollAmount);
|
|
return mArrowScrollFocusResult;
|
|
}
|
|
}
|
|
return null;
|
|
}
|
|
|
|
/**
|
|
* @param newFocus The view that would have focus.
|
|
* @return the position that contains newFocus
|
|
*/
|
|
private int positionOfNewFocus(View newFocus) {
|
|
final int numChildren = getChildCount();
|
|
for (int i = 0; i < numChildren; i++) {
|
|
final View child = getChildAt(i);
|
|
if (isViewAncestorOf(newFocus, child)) {
|
|
return mFirstPosition + i;
|
|
}
|
|
}
|
|
throw new IllegalArgumentException("newFocus is not a child of any of the"
|
|
+ " children of the list!");
|
|
}
|
|
|
|
/**
|
|
* Return true if child is an ancestor of parent, (or equal to the parent).
|
|
*/
|
|
private boolean isViewAncestorOf(View child, View parent) {
|
|
if (child == parent) {
|
|
return true;
|
|
}
|
|
|
|
final ViewParent theParent = child.getParent();
|
|
return (theParent instanceof ViewGroup) && isViewAncestorOf((View) theParent, parent);
|
|
}
|
|
|
|
/**
|
|
* Determine how much we need to scroll in order to get newFocus in view.
|
|
* @param direction either {@link android.view.View#FOCUS_UP} or
|
|
* {@link android.view.View#FOCUS_DOWN}.
|
|
* @param newFocus The view that would take focus.
|
|
* @param positionOfNewFocus The position of the list item containing newFocus
|
|
* @return The amount to scroll. Note: this is always positive! Direction
|
|
* needs to be taken into account when actually scrolling.
|
|
*/
|
|
private int amountToScrollToNewFocus(int direction, View newFocus, int positionOfNewFocus) {
|
|
int amountToScroll = 0;
|
|
newFocus.getDrawingRect(mTempRect);
|
|
offsetDescendantRectToMyCoords(newFocus, mTempRect);
|
|
if (direction == View.FOCUS_UP) {
|
|
if (mTempRect.top < mListPadding.top) {
|
|
amountToScroll = mListPadding.top - mTempRect.top;
|
|
if (positionOfNewFocus > 0) {
|
|
amountToScroll += getArrowScrollPreviewLength();
|
|
}
|
|
}
|
|
} else {
|
|
final int listBottom = getHeight() - mListPadding.bottom;
|
|
if (mTempRect.bottom > listBottom) {
|
|
amountToScroll = mTempRect.bottom - listBottom;
|
|
if (positionOfNewFocus < mItemCount - 1) {
|
|
amountToScroll += getArrowScrollPreviewLength();
|
|
}
|
|
}
|
|
}
|
|
return amountToScroll;
|
|
}
|
|
|
|
/**
|
|
* Determine the distance to the nearest edge of a view in a particular
|
|
* direction.
|
|
*
|
|
* @param descendant A descendant of this list.
|
|
* @return The distance, or 0 if the nearest edge is already on screen.
|
|
*/
|
|
private int distanceToView(View descendant) {
|
|
int distance = 0;
|
|
descendant.getDrawingRect(mTempRect);
|
|
offsetDescendantRectToMyCoords(descendant, mTempRect);
|
|
final int listBottom = mBottom - mTop - mListPadding.bottom;
|
|
if (mTempRect.bottom < mListPadding.top) {
|
|
distance = mListPadding.top - mTempRect.bottom;
|
|
} else if (mTempRect.top > listBottom) {
|
|
distance = mTempRect.top - listBottom;
|
|
}
|
|
return distance;
|
|
}
|
|
|
|
|
|
/**
|
|
* Scroll the children by amount, adding a view at the end and removing
|
|
* views that fall off as necessary.
|
|
*
|
|
* @param amount The amount (positive or negative) to scroll.
|
|
*/
|
|
@UnsupportedAppUsage
|
|
private void scrollListItemsBy(int amount) {
|
|
int oldX = mScrollX;
|
|
int oldY = mScrollY;
|
|
|
|
offsetChildrenTopAndBottom(amount);
|
|
|
|
final int listBottom = getHeight() - mListPadding.bottom;
|
|
final int listTop = mListPadding.top;
|
|
final AbsListView.RecycleBin recycleBin = mRecycler;
|
|
|
|
if (amount < 0) {
|
|
// shifted items up
|
|
|
|
// may need to pan views into the bottom space
|
|
int numChildren = getChildCount();
|
|
View last = getChildAt(numChildren - 1);
|
|
while (last.getBottom() < listBottom) {
|
|
final int lastVisiblePosition = mFirstPosition + numChildren - 1;
|
|
if (lastVisiblePosition < mItemCount - 1) {
|
|
last = addViewBelow(last, lastVisiblePosition);
|
|
numChildren++;
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
|
|
// may have brought in the last child of the list that is skinnier
|
|
// than the fading edge, thereby leaving space at the end. need
|
|
// to shift back
|
|
if (last.getBottom() < listBottom) {
|
|
offsetChildrenTopAndBottom(listBottom - last.getBottom());
|
|
}
|
|
|
|
// top views may be panned off screen
|
|
View first = getChildAt(0);
|
|
while (first.getBottom() < listTop) {
|
|
AbsListView.LayoutParams layoutParams = (LayoutParams) first.getLayoutParams();
|
|
if (recycleBin.shouldRecycleViewType(layoutParams.viewType)) {
|
|
recycleBin.addScrapView(first, mFirstPosition);
|
|
}
|
|
detachViewFromParent(first);
|
|
first = getChildAt(0);
|
|
mFirstPosition++;
|
|
}
|
|
} else {
|
|
// shifted items down
|
|
View first = getChildAt(0);
|
|
|
|
// may need to pan views into top
|
|
while ((first.getTop() > listTop) && (mFirstPosition > 0)) {
|
|
first = addViewAbove(first, mFirstPosition);
|
|
mFirstPosition--;
|
|
}
|
|
|
|
// may have brought the very first child of the list in too far and
|
|
// need to shift it back
|
|
if (first.getTop() > listTop) {
|
|
offsetChildrenTopAndBottom(listTop - first.getTop());
|
|
}
|
|
|
|
int lastIndex = getChildCount() - 1;
|
|
View last = getChildAt(lastIndex);
|
|
|
|
// bottom view may be panned off screen
|
|
while (last.getTop() > listBottom) {
|
|
AbsListView.LayoutParams layoutParams = (LayoutParams) last.getLayoutParams();
|
|
if (recycleBin.shouldRecycleViewType(layoutParams.viewType)) {
|
|
recycleBin.addScrapView(last, mFirstPosition+lastIndex);
|
|
}
|
|
detachViewFromParent(last);
|
|
last = getChildAt(--lastIndex);
|
|
}
|
|
}
|
|
recycleBin.fullyDetachScrapViews();
|
|
removeUnusedFixedViews(mHeaderViewInfos);
|
|
removeUnusedFixedViews(mFooterViewInfos);
|
|
onScrollChanged(mScrollX, mScrollY, oldX, oldY);
|
|
}
|
|
|
|
private View addViewAbove(View theView, int position) {
|
|
int abovePosition = position - 1;
|
|
View view = obtainView(abovePosition, mIsScrap);
|
|
int edgeOfNewChild = theView.getTop() - mDividerHeight;
|
|
setupChild(view, abovePosition, edgeOfNewChild, false, mListPadding.left,
|
|
false, mIsScrap[0]);
|
|
return view;
|
|
}
|
|
|
|
private View addViewBelow(View theView, int position) {
|
|
int belowPosition = position + 1;
|
|
View view = obtainView(belowPosition, mIsScrap);
|
|
int edgeOfNewChild = theView.getBottom() + mDividerHeight;
|
|
setupChild(view, belowPosition, edgeOfNewChild, true, mListPadding.left,
|
|
false, mIsScrap[0]);
|
|
return view;
|
|
}
|
|
|
|
/**
|
|
* Indicates that the views created by the ListAdapter can contain focusable
|
|
* items.
|
|
*
|
|
* @param itemsCanFocus true if items can get focus, false otherwise
|
|
*/
|
|
public void setItemsCanFocus(boolean itemsCanFocus) {
|
|
mItemsCanFocus = itemsCanFocus;
|
|
if (!itemsCanFocus) {
|
|
setDescendantFocusability(ViewGroup.FOCUS_BLOCK_DESCENDANTS);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @return Whether the views created by the ListAdapter can contain focusable
|
|
* items.
|
|
*/
|
|
public boolean getItemsCanFocus() {
|
|
return mItemsCanFocus;
|
|
}
|
|
|
|
@Override
|
|
public boolean isOpaque() {
|
|
boolean retValue = (mCachingActive && mIsCacheColorOpaque && mDividerIsOpaque &&
|
|
hasOpaqueScrollbars()) || super.isOpaque();
|
|
if (retValue) {
|
|
// only return true if the list items cover the entire area of the view
|
|
final int listTop = mListPadding != null ? mListPadding.top : mPaddingTop;
|
|
View first = getChildAt(0);
|
|
if (first == null || first.getTop() > listTop) {
|
|
return false;
|
|
}
|
|
final int listBottom = getHeight() -
|
|
(mListPadding != null ? mListPadding.bottom : mPaddingBottom);
|
|
View last = getChildAt(getChildCount() - 1);
|
|
if (last == null || last.getBottom() < listBottom) {
|
|
return false;
|
|
}
|
|
}
|
|
return retValue;
|
|
}
|
|
|
|
@Override
|
|
public void setCacheColorHint(int color) {
|
|
final boolean opaque = (color >>> 24) == 0xFF;
|
|
mIsCacheColorOpaque = opaque;
|
|
if (opaque) {
|
|
if (mDividerPaint == null) {
|
|
mDividerPaint = new Paint();
|
|
}
|
|
mDividerPaint.setColor(color);
|
|
}
|
|
super.setCacheColorHint(color);
|
|
}
|
|
|
|
void drawOverscrollHeader(Canvas canvas, Drawable drawable, Rect bounds) {
|
|
final int height = drawable.getMinimumHeight();
|
|
|
|
canvas.save();
|
|
canvas.clipRect(bounds);
|
|
|
|
final int span = bounds.bottom - bounds.top;
|
|
if (span < height) {
|
|
bounds.top = bounds.bottom - height;
|
|
}
|
|
|
|
drawable.setBounds(bounds);
|
|
drawable.draw(canvas);
|
|
|
|
canvas.restore();
|
|
}
|
|
|
|
void drawOverscrollFooter(Canvas canvas, Drawable drawable, Rect bounds) {
|
|
final int height = drawable.getMinimumHeight();
|
|
|
|
canvas.save();
|
|
canvas.clipRect(bounds);
|
|
|
|
final int span = bounds.bottom - bounds.top;
|
|
if (span < height) {
|
|
bounds.bottom = bounds.top + height;
|
|
}
|
|
|
|
drawable.setBounds(bounds);
|
|
drawable.draw(canvas);
|
|
|
|
canvas.restore();
|
|
}
|
|
|
|
@Override
|
|
protected void dispatchDraw(Canvas canvas) {
|
|
if (mCachingStarted) {
|
|
mCachingActive = true;
|
|
}
|
|
|
|
// Draw the dividers
|
|
final int dividerHeight = mDividerHeight;
|
|
final Drawable overscrollHeader = mOverScrollHeader;
|
|
final Drawable overscrollFooter = mOverScrollFooter;
|
|
final boolean drawOverscrollHeader = overscrollHeader != null;
|
|
final boolean drawOverscrollFooter = overscrollFooter != null;
|
|
final boolean drawDividers = dividerHeight > 0 && mDivider != null;
|
|
|
|
if (drawDividers || drawOverscrollHeader || drawOverscrollFooter) {
|
|
// Only modify the top and bottom in the loop, we set the left and right here
|
|
final Rect bounds = mTempRect;
|
|
bounds.left = mPaddingLeft;
|
|
bounds.right = mRight - mLeft - mPaddingRight;
|
|
|
|
final int count = getChildCount();
|
|
final int headerCount = getHeaderViewsCount();
|
|
final int itemCount = mItemCount;
|
|
final int footerLimit = (itemCount - mFooterViewInfos.size());
|
|
final boolean headerDividers = mHeaderDividersEnabled;
|
|
final boolean footerDividers = mFooterDividersEnabled;
|
|
final int first = mFirstPosition;
|
|
final boolean areAllItemsSelectable = mAreAllItemsSelectable;
|
|
final ListAdapter adapter = mAdapter;
|
|
// If the list is opaque *and* the background is not, we want to
|
|
// fill a rect where the dividers would be for non-selectable items
|
|
// If the list is opaque and the background is also opaque, we don't
|
|
// need to draw anything since the background will do it for us
|
|
final boolean fillForMissingDividers = isOpaque() && !super.isOpaque();
|
|
|
|
if (fillForMissingDividers && mDividerPaint == null && mIsCacheColorOpaque) {
|
|
mDividerPaint = new Paint();
|
|
mDividerPaint.setColor(getCacheColorHint());
|
|
}
|
|
final Paint paint = mDividerPaint;
|
|
|
|
int effectivePaddingTop = 0;
|
|
int effectivePaddingBottom = 0;
|
|
if ((mGroupFlags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK) {
|
|
effectivePaddingTop = mListPadding.top;
|
|
effectivePaddingBottom = mListPadding.bottom;
|
|
}
|
|
|
|
final int listBottom = mBottom - mTop - effectivePaddingBottom + mScrollY;
|
|
if (!mStackFromBottom) {
|
|
int bottom = 0;
|
|
|
|
// Draw top divider or header for overscroll
|
|
final int scrollY = mScrollY;
|
|
if (count > 0 && scrollY < 0) {
|
|
if (drawOverscrollHeader) {
|
|
bounds.bottom = 0;
|
|
bounds.top = scrollY;
|
|
drawOverscrollHeader(canvas, overscrollHeader, bounds);
|
|
} else if (drawDividers) {
|
|
bounds.bottom = 0;
|
|
bounds.top = -dividerHeight;
|
|
drawDivider(canvas, bounds, -1);
|
|
}
|
|
}
|
|
|
|
for (int i = 0; i < count; i++) {
|
|
final int itemIndex = (first + i);
|
|
final boolean isHeader = (itemIndex < headerCount);
|
|
final boolean isFooter = (itemIndex >= footerLimit);
|
|
if ((headerDividers || !isHeader) && (footerDividers || !isFooter)) {
|
|
final View child = getChildAt(i);
|
|
bottom = child.getBottom();
|
|
final boolean isLastItem = (i == (count - 1));
|
|
|
|
if (drawDividers && (bottom < listBottom)
|
|
&& !(drawOverscrollFooter && isLastItem)) {
|
|
final int nextIndex = (itemIndex + 1);
|
|
// Draw dividers between enabled items, headers
|
|
// and/or footers when enabled and requested, and
|
|
// after the last enabled item.
|
|
if (adapter.isEnabled(itemIndex) && (headerDividers || !isHeader
|
|
&& (nextIndex >= headerCount)) && (isLastItem
|
|
|| adapter.isEnabled(nextIndex) && (footerDividers || !isFooter
|
|
&& (nextIndex < footerLimit)))) {
|
|
bounds.top = bottom;
|
|
bounds.bottom = bottom + dividerHeight;
|
|
drawDivider(canvas, bounds, i);
|
|
} else if (fillForMissingDividers) {
|
|
bounds.top = bottom;
|
|
bounds.bottom = bottom + dividerHeight;
|
|
canvas.drawRect(bounds, paint);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
final int overFooterBottom = mBottom + mScrollY;
|
|
if (drawOverscrollFooter && first + count == itemCount &&
|
|
overFooterBottom > bottom) {
|
|
bounds.top = bottom;
|
|
bounds.bottom = overFooterBottom;
|
|
drawOverscrollFooter(canvas, overscrollFooter, bounds);
|
|
}
|
|
} else {
|
|
int top;
|
|
|
|
final int scrollY = mScrollY;
|
|
|
|
if (count > 0 && drawOverscrollHeader) {
|
|
bounds.top = scrollY;
|
|
bounds.bottom = getChildAt(0).getTop();
|
|
drawOverscrollHeader(canvas, overscrollHeader, bounds);
|
|
}
|
|
|
|
final int start = drawOverscrollHeader ? 1 : 0;
|
|
for (int i = start; i < count; i++) {
|
|
final int itemIndex = (first + i);
|
|
final boolean isHeader = (itemIndex < headerCount);
|
|
final boolean isFooter = (itemIndex >= footerLimit);
|
|
if ((headerDividers || !isHeader) && (footerDividers || !isFooter)) {
|
|
final View child = getChildAt(i);
|
|
top = child.getTop();
|
|
if (drawDividers && (top > effectivePaddingTop)) {
|
|
final boolean isFirstItem = (i == start);
|
|
final int previousIndex = (itemIndex - 1);
|
|
// Draw dividers between enabled items, headers
|
|
// and/or footers when enabled and requested, and
|
|
// before the first enabled item.
|
|
if (adapter.isEnabled(itemIndex) && (headerDividers || !isHeader
|
|
&& (previousIndex >= headerCount)) && (isFirstItem ||
|
|
adapter.isEnabled(previousIndex) && (footerDividers || !isFooter
|
|
&& (previousIndex < footerLimit)))) {
|
|
bounds.top = top - dividerHeight;
|
|
bounds.bottom = top;
|
|
// Give the method the child ABOVE the divider,
|
|
// so we subtract one from our child position.
|
|
// Give -1 when there is no child above the
|
|
// divider.
|
|
drawDivider(canvas, bounds, i - 1);
|
|
} else if (fillForMissingDividers) {
|
|
bounds.top = top - dividerHeight;
|
|
bounds.bottom = top;
|
|
canvas.drawRect(bounds, paint);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if (count > 0 && scrollY > 0) {
|
|
if (drawOverscrollFooter) {
|
|
final int absListBottom = mBottom;
|
|
bounds.top = absListBottom;
|
|
bounds.bottom = absListBottom + scrollY;
|
|
drawOverscrollFooter(canvas, overscrollFooter, bounds);
|
|
} else if (drawDividers) {
|
|
bounds.top = listBottom;
|
|
bounds.bottom = listBottom + dividerHeight;
|
|
drawDivider(canvas, bounds, -1);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// Draw the indicators (these should be drawn above the dividers) and children
|
|
super.dispatchDraw(canvas);
|
|
}
|
|
|
|
@Override
|
|
protected boolean drawChild(Canvas canvas, View child, long drawingTime) {
|
|
boolean more = super.drawChild(canvas, child, drawingTime);
|
|
if (mCachingActive && child.mCachingFailed) {
|
|
mCachingActive = false;
|
|
}
|
|
return more;
|
|
}
|
|
|
|
/**
|
|
* Draws a divider for the given child in the given bounds.
|
|
*
|
|
* @param canvas The canvas to draw to.
|
|
* @param bounds The bounds of the divider.
|
|
* @param childIndex The index of child (of the View) above the divider.
|
|
* This will be -1 if there is no child above the divider to be
|
|
* drawn.
|
|
*/
|
|
void drawDivider(Canvas canvas, Rect bounds, int childIndex) {
|
|
// This widget draws the same divider for all children
|
|
final Drawable divider = mDivider;
|
|
|
|
divider.setBounds(bounds);
|
|
divider.draw(canvas);
|
|
}
|
|
|
|
/**
|
|
* Returns the drawable that will be drawn between each item in the list.
|
|
*
|
|
* @return the current drawable drawn between list elements
|
|
* @attr ref R.styleable#ListView_divider
|
|
*/
|
|
@InspectableProperty
|
|
@Nullable
|
|
public Drawable getDivider() {
|
|
return mDivider;
|
|
}
|
|
|
|
/**
|
|
* Sets the drawable that will be drawn between each item in the list.
|
|
* <p>
|
|
* <strong>Note:</strong> If the drawable does not have an intrinsic
|
|
* height, you should also call {@link #setDividerHeight(int)}.
|
|
*
|
|
* @param divider the drawable to use
|
|
* @attr ref R.styleable#ListView_divider
|
|
*/
|
|
public void setDivider(@Nullable Drawable divider) {
|
|
if (divider != null) {
|
|
mDividerHeight = divider.getIntrinsicHeight();
|
|
} else {
|
|
mDividerHeight = 0;
|
|
}
|
|
mDivider = divider;
|
|
mDividerIsOpaque = divider == null || divider.getOpacity() == PixelFormat.OPAQUE;
|
|
requestLayout();
|
|
invalidate();
|
|
}
|
|
|
|
/**
|
|
* @return Returns the height of the divider that will be drawn between each item in the list.
|
|
*/
|
|
@InspectableProperty
|
|
public int getDividerHeight() {
|
|
return mDividerHeight;
|
|
}
|
|
|
|
/**
|
|
* Sets the height of the divider that will be drawn between each item in the list. Calling
|
|
* this will override the intrinsic height as set by {@link #setDivider(Drawable)}
|
|
*
|
|
* @param height The new height of the divider in pixels.
|
|
*/
|
|
public void setDividerHeight(int height) {
|
|
mDividerHeight = height;
|
|
requestLayout();
|
|
invalidate();
|
|
}
|
|
|
|
/**
|
|
* Enables or disables the drawing of the divider for header views.
|
|
*
|
|
* @param headerDividersEnabled True to draw the headers, false otherwise.
|
|
*
|
|
* @see #setFooterDividersEnabled(boolean)
|
|
* @see #areHeaderDividersEnabled()
|
|
* @see #addHeaderView(android.view.View)
|
|
*/
|
|
public void setHeaderDividersEnabled(boolean headerDividersEnabled) {
|
|
mHeaderDividersEnabled = headerDividersEnabled;
|
|
invalidate();
|
|
}
|
|
|
|
/**
|
|
* @return Whether the drawing of the divider for header views is enabled
|
|
*
|
|
* @see #setHeaderDividersEnabled(boolean)
|
|
*/
|
|
@InspectableProperty(name = "headerDividersEnabled")
|
|
public boolean areHeaderDividersEnabled() {
|
|
return mHeaderDividersEnabled;
|
|
}
|
|
|
|
/**
|
|
* Enables or disables the drawing of the divider for footer views.
|
|
*
|
|
* @param footerDividersEnabled True to draw the footers, false otherwise.
|
|
*
|
|
* @see #setHeaderDividersEnabled(boolean)
|
|
* @see #areFooterDividersEnabled()
|
|
* @see #addFooterView(android.view.View)
|
|
*/
|
|
public void setFooterDividersEnabled(boolean footerDividersEnabled) {
|
|
mFooterDividersEnabled = footerDividersEnabled;
|
|
invalidate();
|
|
}
|
|
|
|
/**
|
|
* @return Whether the drawing of the divider for footer views is enabled
|
|
*
|
|
* @see #setFooterDividersEnabled(boolean)
|
|
*/
|
|
@InspectableProperty(name = "footerDividersEnabled")
|
|
public boolean areFooterDividersEnabled() {
|
|
return mFooterDividersEnabled;
|
|
}
|
|
|
|
/**
|
|
* Sets the drawable that will be drawn above all other list content.
|
|
* This area can become visible when the user overscrolls the list.
|
|
*
|
|
* @param header The drawable to use
|
|
*/
|
|
public void setOverscrollHeader(Drawable header) {
|
|
mOverScrollHeader = header;
|
|
if (mScrollY < 0) {
|
|
invalidate();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @return The drawable that will be drawn above all other list content
|
|
*/
|
|
public Drawable getOverscrollHeader() {
|
|
return mOverScrollHeader;
|
|
}
|
|
|
|
/**
|
|
* Sets the drawable that will be drawn below all other list content.
|
|
* This area can become visible when the user overscrolls the list,
|
|
* or when the list's content does not fully fill the container area.
|
|
*
|
|
* @param footer The drawable to use
|
|
*/
|
|
public void setOverscrollFooter(Drawable footer) {
|
|
mOverScrollFooter = footer;
|
|
invalidate();
|
|
}
|
|
|
|
/**
|
|
* @return The drawable that will be drawn below all other list content
|
|
*/
|
|
public Drawable getOverscrollFooter() {
|
|
return mOverScrollFooter;
|
|
}
|
|
|
|
@Override
|
|
protected void onFocusChanged(boolean gainFocus, int direction, Rect previouslyFocusedRect) {
|
|
super.onFocusChanged(gainFocus, direction, previouslyFocusedRect);
|
|
|
|
final ListAdapter adapter = mAdapter;
|
|
int closetChildIndex = -1;
|
|
int closestChildTop = 0;
|
|
if (adapter != null && gainFocus && previouslyFocusedRect != null) {
|
|
previouslyFocusedRect.offset(mScrollX, mScrollY);
|
|
|
|
// Don't cache the result of getChildCount or mFirstPosition here,
|
|
// it could change in layoutChildren.
|
|
if (adapter.getCount() < getChildCount() + mFirstPosition) {
|
|
mLayoutMode = LAYOUT_NORMAL;
|
|
layoutChildren();
|
|
}
|
|
|
|
// figure out which item should be selected based on previously
|
|
// focused rect
|
|
Rect otherRect = mTempRect;
|
|
int minDistance = Integer.MAX_VALUE;
|
|
final int childCount = getChildCount();
|
|
final int firstPosition = mFirstPosition;
|
|
|
|
for (int i = 0; i < childCount; i++) {
|
|
// only consider selectable views
|
|
if (!adapter.isEnabled(firstPosition + i)) {
|
|
continue;
|
|
}
|
|
|
|
View other = getChildAt(i);
|
|
other.getDrawingRect(otherRect);
|
|
offsetDescendantRectToMyCoords(other, otherRect);
|
|
int distance = getDistance(previouslyFocusedRect, otherRect, direction);
|
|
|
|
if (distance < minDistance) {
|
|
minDistance = distance;
|
|
closetChildIndex = i;
|
|
closestChildTop = other.getTop();
|
|
}
|
|
}
|
|
}
|
|
|
|
if (closetChildIndex >= 0) {
|
|
setSelectionFromTop(closetChildIndex + mFirstPosition, closestChildTop);
|
|
} else {
|
|
requestLayout();
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* (non-Javadoc)
|
|
*
|
|
* Children specified in XML are assumed to be header views. After we have
|
|
* parsed them move them out of the children list and into mHeaderViews.
|
|
*/
|
|
@Override
|
|
protected void onFinishInflate() {
|
|
super.onFinishInflate();
|
|
|
|
int count = getChildCount();
|
|
if (count > 0) {
|
|
for (int i = 0; i < count; ++i) {
|
|
addHeaderView(getChildAt(i));
|
|
}
|
|
removeAllViews();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @see android.view.View#findViewById(int)
|
|
* @removed For internal use only. This should have been hidden.
|
|
*/
|
|
@Override
|
|
protected <T extends View> T findViewTraversal(@IdRes int id) {
|
|
// First look in our children, then in any header and footer views that
|
|
// may be scrolled off.
|
|
View v = super.findViewTraversal(id);
|
|
if (v == null) {
|
|
v = findViewInHeadersOrFooters(mHeaderViewInfos, id);
|
|
if (v != null) {
|
|
return (T) v;
|
|
}
|
|
v = findViewInHeadersOrFooters(mFooterViewInfos, id);
|
|
if (v != null) {
|
|
return (T) v;
|
|
}
|
|
}
|
|
return (T) v;
|
|
}
|
|
|
|
View findViewInHeadersOrFooters(ArrayList<FixedViewInfo> where, int id) {
|
|
// Look in the passed in list of headers or footers for the view.
|
|
if (where != null) {
|
|
int len = where.size();
|
|
View v;
|
|
|
|
for (int i = 0; i < len; i++) {
|
|
v = where.get(i).view;
|
|
|
|
if (!v.isRootNamespace()) {
|
|
v = v.findViewById(id);
|
|
|
|
if (v != null) {
|
|
return v;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return null;
|
|
}
|
|
|
|
/**
|
|
* @see android.view.View#findViewWithTag(Object)
|
|
* @removed For internal use only. This should have been hidden.
|
|
*/
|
|
@Override
|
|
protected <T extends View> T findViewWithTagTraversal(Object tag) {
|
|
// First look in our children, then in any header and footer views that
|
|
// may be scrolled off.
|
|
View v = super.findViewWithTagTraversal(tag);
|
|
if (v == null) {
|
|
v = findViewWithTagInHeadersOrFooters(mHeaderViewInfos, tag);
|
|
if (v != null) {
|
|
return (T) v;
|
|
}
|
|
|
|
v = findViewWithTagInHeadersOrFooters(mFooterViewInfos, tag);
|
|
if (v != null) {
|
|
return (T) v;
|
|
}
|
|
}
|
|
return (T) v;
|
|
}
|
|
|
|
View findViewWithTagInHeadersOrFooters(ArrayList<FixedViewInfo> where, Object tag) {
|
|
// Look in the passed in list of headers or footers for the view with
|
|
// the tag.
|
|
if (where != null) {
|
|
int len = where.size();
|
|
View v;
|
|
|
|
for (int i = 0; i < len; i++) {
|
|
v = where.get(i).view;
|
|
|
|
if (!v.isRootNamespace()) {
|
|
v = v.findViewWithTag(tag);
|
|
|
|
if (v != null) {
|
|
return v;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return null;
|
|
}
|
|
|
|
/**
|
|
* First look in our children, then in any header and footer views that may
|
|
* be scrolled off.
|
|
*
|
|
* @see android.view.View#findViewByPredicate(Predicate)
|
|
* @hide
|
|
*/
|
|
@Override
|
|
protected <T extends View> T findViewByPredicateTraversal(
|
|
Predicate<View> predicate, View childToSkip) {
|
|
View v = super.findViewByPredicateTraversal(predicate, childToSkip);
|
|
if (v == null) {
|
|
v = findViewByPredicateInHeadersOrFooters(mHeaderViewInfos, predicate, childToSkip);
|
|
if (v != null) {
|
|
return (T) v;
|
|
}
|
|
|
|
v = findViewByPredicateInHeadersOrFooters(mFooterViewInfos, predicate, childToSkip);
|
|
if (v != null) {
|
|
return (T) v;
|
|
}
|
|
}
|
|
return (T) v;
|
|
}
|
|
|
|
/**
|
|
* Look in the passed in list of headers or footers for the first view that
|
|
* matches the predicate.
|
|
*/
|
|
View findViewByPredicateInHeadersOrFooters(ArrayList<FixedViewInfo> where,
|
|
Predicate<View> predicate, View childToSkip) {
|
|
if (where != null) {
|
|
int len = where.size();
|
|
View v;
|
|
|
|
for (int i = 0; i < len; i++) {
|
|
v = where.get(i).view;
|
|
|
|
if (v != childToSkip && !v.isRootNamespace()) {
|
|
v = v.findViewByPredicate(predicate);
|
|
|
|
if (v != null) {
|
|
return v;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return null;
|
|
}
|
|
|
|
/**
|
|
* Returns the set of checked items ids. The result is only valid if the
|
|
* choice mode has not been set to {@link #CHOICE_MODE_NONE}.
|
|
*
|
|
* @return A new array which contains the id of each checked item in the
|
|
* list.
|
|
*
|
|
* @deprecated Use {@link #getCheckedItemIds()} instead.
|
|
*/
|
|
@Deprecated
|
|
public long[] getCheckItemIds() {
|
|
// Use new behavior that correctly handles stable ID mapping.
|
|
if (mAdapter != null && mAdapter.hasStableIds()) {
|
|
return getCheckedItemIds();
|
|
}
|
|
|
|
// Old behavior was buggy, but would sort of work for adapters without stable IDs.
|
|
// Fall back to it to support legacy apps.
|
|
if (mChoiceMode != CHOICE_MODE_NONE && mCheckStates != null && mAdapter != null) {
|
|
final SparseBooleanArray states = mCheckStates;
|
|
final int count = states.size();
|
|
final long[] ids = new long[count];
|
|
final ListAdapter adapter = mAdapter;
|
|
|
|
int checkedCount = 0;
|
|
for (int i = 0; i < count; i++) {
|
|
if (states.valueAt(i)) {
|
|
ids[checkedCount++] = adapter.getItemId(states.keyAt(i));
|
|
}
|
|
}
|
|
|
|
// Trim array if needed. mCheckStates may contain false values
|
|
// resulting in checkedCount being smaller than count.
|
|
if (checkedCount == count) {
|
|
return ids;
|
|
} else {
|
|
final long[] result = new long[checkedCount];
|
|
System.arraycopy(ids, 0, result, 0, checkedCount);
|
|
|
|
return result;
|
|
}
|
|
}
|
|
return new long[0];
|
|
}
|
|
|
|
@Override
|
|
@UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.R, trackingBug = 170729553)
|
|
int getHeightForPosition(int position) {
|
|
final int height = super.getHeightForPosition(position);
|
|
if (shouldAdjustHeightForDivider(position)) {
|
|
return height + mDividerHeight;
|
|
}
|
|
return height;
|
|
}
|
|
|
|
private boolean shouldAdjustHeightForDivider(int itemIndex) {
|
|
final int dividerHeight = mDividerHeight;
|
|
final Drawable overscrollHeader = mOverScrollHeader;
|
|
final Drawable overscrollFooter = mOverScrollFooter;
|
|
final boolean drawOverscrollHeader = overscrollHeader != null;
|
|
final boolean drawOverscrollFooter = overscrollFooter != null;
|
|
final boolean drawDividers = dividerHeight > 0 && mDivider != null;
|
|
|
|
if (drawDividers) {
|
|
final boolean fillForMissingDividers = isOpaque() && !super.isOpaque();
|
|
final int itemCount = mItemCount;
|
|
final int headerCount = getHeaderViewsCount();
|
|
final int footerLimit = (itemCount - mFooterViewInfos.size());
|
|
final boolean isHeader = (itemIndex < headerCount);
|
|
final boolean isFooter = (itemIndex >= footerLimit);
|
|
final boolean headerDividers = mHeaderDividersEnabled;
|
|
final boolean footerDividers = mFooterDividersEnabled;
|
|
if ((headerDividers || !isHeader) && (footerDividers || !isFooter)) {
|
|
final ListAdapter adapter = mAdapter;
|
|
if (!mStackFromBottom) {
|
|
final boolean isLastItem = (itemIndex == (itemCount - 1));
|
|
if (!drawOverscrollFooter || !isLastItem) {
|
|
final int nextIndex = itemIndex + 1;
|
|
// Draw dividers between enabled items, headers
|
|
// and/or footers when enabled and requested, and
|
|
// after the last enabled item.
|
|
if (adapter.isEnabled(itemIndex) && (headerDividers || !isHeader
|
|
&& (nextIndex >= headerCount)) && (isLastItem
|
|
|| adapter.isEnabled(nextIndex) && (footerDividers || !isFooter
|
|
&& (nextIndex < footerLimit)))) {
|
|
return true;
|
|
} else if (fillForMissingDividers) {
|
|
return true;
|
|
}
|
|
}
|
|
} else {
|
|
final int start = drawOverscrollHeader ? 1 : 0;
|
|
final boolean isFirstItem = (itemIndex == start);
|
|
if (!isFirstItem) {
|
|
final int previousIndex = (itemIndex - 1);
|
|
// Draw dividers between enabled items, headers
|
|
// and/or footers when enabled and requested, and
|
|
// before the first enabled item.
|
|
if (adapter.isEnabled(itemIndex) && (headerDividers || !isHeader
|
|
&& (previousIndex >= headerCount)) && (isFirstItem ||
|
|
adapter.isEnabled(previousIndex) && (footerDividers || !isFooter
|
|
&& (previousIndex < footerLimit)))) {
|
|
return true;
|
|
} else if (fillForMissingDividers) {
|
|
return true;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
@Override
|
|
public CharSequence getAccessibilityClassName() {
|
|
return ListView.class.getName();
|
|
}
|
|
|
|
/** @hide */
|
|
@Override
|
|
public void onInitializeAccessibilityNodeInfoInternal(AccessibilityNodeInfo info) {
|
|
super.onInitializeAccessibilityNodeInfoInternal(info);
|
|
|
|
final int rowsCount = getCount();
|
|
final int selectionMode = getSelectionModeForAccessibility();
|
|
final CollectionInfo collectionInfo = CollectionInfo.obtain(
|
|
-1, -1, false, selectionMode);
|
|
info.setCollectionInfo(collectionInfo);
|
|
|
|
if (rowsCount > 0) {
|
|
info.addAction(AccessibilityAction.ACTION_SCROLL_TO_POSITION);
|
|
}
|
|
}
|
|
|
|
/** @hide */
|
|
@Override
|
|
public boolean performAccessibilityActionInternal(int action, Bundle arguments) {
|
|
if (super.performAccessibilityActionInternal(action, arguments)) {
|
|
return true;
|
|
}
|
|
|
|
switch (action) {
|
|
case R.id.accessibilityActionScrollToPosition: {
|
|
final int row = arguments.getInt(AccessibilityNodeInfo.ACTION_ARGUMENT_ROW_INT, -1);
|
|
final int position = Math.min(row, getCount() - 1);
|
|
if (row >= 0) {
|
|
// The accessibility service gets data asynchronously, so
|
|
// we'll be a little lenient by clamping the last position.
|
|
smoothScrollToPosition(position);
|
|
return true;
|
|
}
|
|
} break;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
@Override
|
|
public void onInitializeAccessibilityNodeInfoForItem(
|
|
View view, int position, AccessibilityNodeInfo info) {
|
|
super.onInitializeAccessibilityNodeInfoForItem(view, position, info);
|
|
|
|
final LayoutParams lp = (LayoutParams) view.getLayoutParams();
|
|
final boolean isHeading = lp != null && lp.viewType == ITEM_VIEW_TYPE_HEADER_OR_FOOTER;
|
|
final boolean isSelected = isItemChecked(position);
|
|
final CollectionItemInfo itemInfo = CollectionItemInfo.obtain(
|
|
position, 1, 0, 1, isHeading, isSelected);
|
|
info.setCollectionItemInfo(itemInfo);
|
|
}
|
|
|
|
/** @hide */
|
|
@Override
|
|
protected void encodeProperties(@NonNull ViewHierarchyEncoder encoder) {
|
|
super.encodeProperties(encoder);
|
|
|
|
encoder.addProperty("recycleOnMeasure", recycleOnMeasure());
|
|
}
|
|
|
|
/** @hide */
|
|
protected HeaderViewListAdapter wrapHeaderListAdapterInternal(
|
|
ArrayList<ListView.FixedViewInfo> headerViewInfos,
|
|
ArrayList<ListView.FixedViewInfo> footerViewInfos,
|
|
ListAdapter adapter) {
|
|
return new HeaderViewListAdapter(headerViewInfos, footerViewInfos, adapter);
|
|
}
|
|
|
|
/** @hide */
|
|
protected void wrapHeaderListAdapterInternal() {
|
|
mAdapter = wrapHeaderListAdapterInternal(mHeaderViewInfos, mFooterViewInfos, mAdapter);
|
|
}
|
|
|
|
/** @hide */
|
|
protected void dispatchDataSetObserverOnChangedInternal() {
|
|
if (mDataSetObserver != null) {
|
|
mDataSetObserver.onChanged();
|
|
}
|
|
}
|
|
}
|