501 lines
19 KiB
Java
501 lines
19 KiB
Java
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/*
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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.AttrRes;
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import android.annotation.NonNull;
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import android.annotation.Nullable;
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import android.annotation.StyleRes;
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import android.compat.annotation.UnsupportedAppUsage;
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import android.content.Context;
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import android.content.res.TypedArray;
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import android.graphics.Rect;
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import android.graphics.drawable.Drawable;
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import android.util.AttributeSet;
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import android.view.Gravity;
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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.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 java.util.ArrayList;
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/**
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* FrameLayout is designed to block out an area on the screen to display
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* a single item. Generally, FrameLayout should be used to hold a single child view, because it can
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* be difficult to organize child views in a way that's scalable to different screen sizes without
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* the children overlapping each other. You can, however, add multiple children to a FrameLayout
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* and control their position within the FrameLayout by assigning gravity to each child, using the
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* <a href="FrameLayout.LayoutParams.html#attr_android:layout_gravity">{@code
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* android:layout_gravity}</a> attribute.
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* <p>Child views are drawn in a stack, with the most recently added child on top.
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* The size of the FrameLayout is the size of its largest child (plus padding), visible
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* or not (if the FrameLayout's parent permits). Views that are {@link android.view.View#GONE} are
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* used for sizing
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* only if {@link #setMeasureAllChildren(boolean) setConsiderGoneChildrenWhenMeasuring()}
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* is set to true.
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*
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* @attr ref android.R.styleable#FrameLayout_measureAllChildren
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*/
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@RemoteView
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public class FrameLayout extends ViewGroup {
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private static final int DEFAULT_CHILD_GRAVITY = Gravity.TOP | Gravity.START;
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@ViewDebug.ExportedProperty(category = "measurement")
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@UnsupportedAppUsage
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boolean mMeasureAllChildren = false;
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@ViewDebug.ExportedProperty(category = "padding")
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@UnsupportedAppUsage
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private int mForegroundPaddingLeft = 0;
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@ViewDebug.ExportedProperty(category = "padding")
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@UnsupportedAppUsage
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private int mForegroundPaddingTop = 0;
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@ViewDebug.ExportedProperty(category = "padding")
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@UnsupportedAppUsage
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private int mForegroundPaddingRight = 0;
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@ViewDebug.ExportedProperty(category = "padding")
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@UnsupportedAppUsage
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private int mForegroundPaddingBottom = 0;
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private final ArrayList<View> mMatchParentChildren = new ArrayList<>(1);
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public FrameLayout(@NonNull Context context) {
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super(context);
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}
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public FrameLayout(@NonNull Context context, @Nullable AttributeSet attrs) {
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this(context, attrs, 0);
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}
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public FrameLayout(@NonNull Context context, @Nullable AttributeSet attrs,
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@AttrRes int defStyleAttr) {
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this(context, attrs, defStyleAttr, 0);
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}
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public FrameLayout(@NonNull Context context, @Nullable AttributeSet attrs,
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@AttrRes int defStyleAttr, @StyleRes 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.FrameLayout, defStyleAttr, defStyleRes);
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saveAttributeDataForStyleable(context, R.styleable.FrameLayout,
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attrs, a, defStyleAttr, defStyleRes);
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if (a.getBoolean(R.styleable.FrameLayout_measureAllChildren, false)) {
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setMeasureAllChildren(true);
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}
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a.recycle();
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}
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/**
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* Describes how the foreground is positioned. Defaults to START and TOP.
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*
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* @param foregroundGravity See {@link android.view.Gravity}
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*
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* @see #getForegroundGravity()
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*
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* @attr ref android.R.styleable#View_foregroundGravity
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*/
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@android.view.RemotableViewMethod
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public void setForegroundGravity(int foregroundGravity) {
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if (getForegroundGravity() != foregroundGravity) {
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super.setForegroundGravity(foregroundGravity);
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// calling get* again here because the set above may apply default constraints
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final Drawable foreground = getForeground();
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if (getForegroundGravity() == Gravity.FILL && foreground != null) {
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Rect padding = new Rect();
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if (foreground.getPadding(padding)) {
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mForegroundPaddingLeft = padding.left;
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mForegroundPaddingTop = padding.top;
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mForegroundPaddingRight = padding.right;
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mForegroundPaddingBottom = padding.bottom;
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}
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} else {
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mForegroundPaddingLeft = 0;
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mForegroundPaddingTop = 0;
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mForegroundPaddingRight = 0;
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mForegroundPaddingBottom = 0;
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}
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requestLayout();
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}
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}
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/**
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* Returns a set of layout parameters with a width of
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* {@link android.view.ViewGroup.LayoutParams#MATCH_PARENT},
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* and a height of {@link android.view.ViewGroup.LayoutParams#MATCH_PARENT}.
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*/
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@Override
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protected LayoutParams generateDefaultLayoutParams() {
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return new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT);
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}
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int getPaddingLeftWithForeground() {
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return isForegroundInsidePadding() ? Math.max(mPaddingLeft, mForegroundPaddingLeft) :
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mPaddingLeft + mForegroundPaddingLeft;
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}
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int getPaddingRightWithForeground() {
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return isForegroundInsidePadding() ? Math.max(mPaddingRight, mForegroundPaddingRight) :
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mPaddingRight + mForegroundPaddingRight;
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}
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private int getPaddingTopWithForeground() {
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return isForegroundInsidePadding() ? Math.max(mPaddingTop, mForegroundPaddingTop) :
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mPaddingTop + mForegroundPaddingTop;
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}
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private int getPaddingBottomWithForeground() {
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return isForegroundInsidePadding() ? Math.max(mPaddingBottom, mForegroundPaddingBottom) :
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mPaddingBottom + mForegroundPaddingBottom;
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}
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@Override
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protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
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int count = getChildCount();
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final boolean measureMatchParentChildren =
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MeasureSpec.getMode(widthMeasureSpec) != MeasureSpec.EXACTLY ||
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MeasureSpec.getMode(heightMeasureSpec) != MeasureSpec.EXACTLY;
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mMatchParentChildren.clear();
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int maxHeight = 0;
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int maxWidth = 0;
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int childState = 0;
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for (int i = 0; i < count; i++) {
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final View child = getChildAt(i);
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if (mMeasureAllChildren || child.getVisibility() != GONE) {
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measureChildWithMargins(child, widthMeasureSpec, 0, heightMeasureSpec, 0);
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final LayoutParams lp = (LayoutParams) child.getLayoutParams();
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maxWidth = Math.max(maxWidth,
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child.getMeasuredWidth() + lp.leftMargin + lp.rightMargin);
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maxHeight = Math.max(maxHeight,
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child.getMeasuredHeight() + lp.topMargin + lp.bottomMargin);
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childState = combineMeasuredStates(childState, child.getMeasuredState());
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if (measureMatchParentChildren) {
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if (lp.width == LayoutParams.MATCH_PARENT ||
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lp.height == LayoutParams.MATCH_PARENT) {
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mMatchParentChildren.add(child);
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}
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}
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}
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}
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// Account for padding too
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maxWidth += getPaddingLeftWithForeground() + getPaddingRightWithForeground();
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maxHeight += getPaddingTopWithForeground() + getPaddingBottomWithForeground();
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// Check against our minimum height and width
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maxHeight = Math.max(maxHeight, getSuggestedMinimumHeight());
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maxWidth = Math.max(maxWidth, getSuggestedMinimumWidth());
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// Check against our foreground's minimum height and width
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final Drawable drawable = getForeground();
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if (drawable != null) {
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maxHeight = Math.max(maxHeight, drawable.getMinimumHeight());
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maxWidth = Math.max(maxWidth, drawable.getMinimumWidth());
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}
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setMeasuredDimension(resolveSizeAndState(maxWidth, widthMeasureSpec, childState),
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resolveSizeAndState(maxHeight, heightMeasureSpec,
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childState << MEASURED_HEIGHT_STATE_SHIFT));
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count = mMatchParentChildren.size();
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if (count > 1) {
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for (int i = 0; i < count; i++) {
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final View child = mMatchParentChildren.get(i);
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final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams();
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final int childWidthMeasureSpec;
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if (lp.width == LayoutParams.MATCH_PARENT) {
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final int width = Math.max(0, getMeasuredWidth()
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- getPaddingLeftWithForeground() - getPaddingRightWithForeground()
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- lp.leftMargin - lp.rightMargin);
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childWidthMeasureSpec = MeasureSpec.makeMeasureSpec(
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width, MeasureSpec.EXACTLY);
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} else {
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childWidthMeasureSpec = getChildMeasureSpec(widthMeasureSpec,
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getPaddingLeftWithForeground() + getPaddingRightWithForeground() +
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lp.leftMargin + lp.rightMargin,
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lp.width);
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}
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final int childHeightMeasureSpec;
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if (lp.height == LayoutParams.MATCH_PARENT) {
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final int height = Math.max(0, getMeasuredHeight()
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- getPaddingTopWithForeground() - getPaddingBottomWithForeground()
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- lp.topMargin - lp.bottomMargin);
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childHeightMeasureSpec = MeasureSpec.makeMeasureSpec(
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height, MeasureSpec.EXACTLY);
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} else {
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childHeightMeasureSpec = getChildMeasureSpec(heightMeasureSpec,
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getPaddingTopWithForeground() + getPaddingBottomWithForeground() +
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lp.topMargin + lp.bottomMargin,
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lp.height);
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}
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child.measure(childWidthMeasureSpec, childHeightMeasureSpec);
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}
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}
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}
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@Override
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protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
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layoutChildren(left, top, right, bottom, false /* no force left gravity */);
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}
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void layoutChildren(int left, int top, int right, int bottom, boolean forceLeftGravity) {
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final int count = getChildCount();
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final int parentLeft = getPaddingLeftWithForeground();
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final int parentRight = right - left - getPaddingRightWithForeground();
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final int parentTop = getPaddingTopWithForeground();
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final int parentBottom = bottom - top - getPaddingBottomWithForeground();
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for (int i = 0; i < count; i++) {
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final View child = getChildAt(i);
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if (child.getVisibility() != GONE) {
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final LayoutParams lp = (LayoutParams) child.getLayoutParams();
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final int width = child.getMeasuredWidth();
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final int height = child.getMeasuredHeight();
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int childLeft;
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int childTop;
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int gravity = lp.gravity;
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if (gravity == -1) {
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gravity = DEFAULT_CHILD_GRAVITY;
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}
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final int layoutDirection = getLayoutDirection();
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final int absoluteGravity = Gravity.getAbsoluteGravity(gravity, layoutDirection);
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final int verticalGravity = gravity & Gravity.VERTICAL_GRAVITY_MASK;
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switch (absoluteGravity & Gravity.HORIZONTAL_GRAVITY_MASK) {
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case Gravity.CENTER_HORIZONTAL:
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childLeft = parentLeft + (parentRight - parentLeft - width) / 2 +
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lp.leftMargin - lp.rightMargin;
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break;
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case Gravity.RIGHT:
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if (!forceLeftGravity) {
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childLeft = parentRight - width - lp.rightMargin;
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break;
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}
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case Gravity.LEFT:
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default:
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childLeft = parentLeft + lp.leftMargin;
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}
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switch (verticalGravity) {
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case Gravity.TOP:
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childTop = parentTop + lp.topMargin;
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break;
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case Gravity.CENTER_VERTICAL:
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childTop = parentTop + (parentBottom - parentTop - height) / 2 +
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lp.topMargin - lp.bottomMargin;
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break;
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case Gravity.BOTTOM:
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childTop = parentBottom - height - lp.bottomMargin;
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break;
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default:
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childTop = parentTop + lp.topMargin;
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}
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child.layout(childLeft, childTop, childLeft + width, childTop + height);
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}
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}
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}
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/**
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* Sets whether to consider all children, or just those in
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* the VISIBLE or INVISIBLE state, when measuring. Defaults to false.
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*
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* @param measureAll true to consider children marked GONE, false otherwise.
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* Default value is false.
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*
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* @attr ref android.R.styleable#FrameLayout_measureAllChildren
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*/
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@android.view.RemotableViewMethod
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public void setMeasureAllChildren(boolean measureAll) {
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mMeasureAllChildren = measureAll;
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}
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/**
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* Determines whether all children, or just those in the VISIBLE or
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* INVISIBLE state, are considered when measuring.
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*
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* @return Whether all children are considered when measuring.
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*
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* @deprecated This method is deprecated in favor of
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* {@link #getMeasureAllChildren() getMeasureAllChildren()}, which was
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* renamed for consistency with
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* {@link #setMeasureAllChildren(boolean) setMeasureAllChildren()}.
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*/
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@Deprecated
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public boolean getConsiderGoneChildrenWhenMeasuring() {
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return getMeasureAllChildren();
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}
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/**
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* Determines whether all children, or just those in the VISIBLE or
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* INVISIBLE state, are considered when measuring.
|
||
|
|
*
|
||
|
|
* @return Whether all children are considered when measuring.
|
||
|
|
*/
|
||
|
|
@InspectableProperty
|
||
|
|
public boolean getMeasureAllChildren() {
|
||
|
|
return mMeasureAllChildren;
|
||
|
|
}
|
||
|
|
|
||
|
|
@Override
|
||
|
|
public LayoutParams generateLayoutParams(AttributeSet attrs) {
|
||
|
|
return new FrameLayout.LayoutParams(getContext(), attrs);
|
||
|
|
}
|
||
|
|
|
||
|
|
@Override
|
||
|
|
public boolean shouldDelayChildPressedState() {
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
@Override
|
||
|
|
protected boolean checkLayoutParams(ViewGroup.LayoutParams p) {
|
||
|
|
return p instanceof LayoutParams;
|
||
|
|
}
|
||
|
|
|
||
|
|
@Override
|
||
|
|
protected ViewGroup.LayoutParams generateLayoutParams(ViewGroup.LayoutParams lp) {
|
||
|
|
if (sPreserveMarginParamsInLayoutParamConversion) {
|
||
|
|
if (lp instanceof LayoutParams) {
|
||
|
|
return new LayoutParams((LayoutParams) lp);
|
||
|
|
} else if (lp instanceof MarginLayoutParams) {
|
||
|
|
return new LayoutParams((MarginLayoutParams) lp);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return new LayoutParams(lp);
|
||
|
|
}
|
||
|
|
|
||
|
|
@Override
|
||
|
|
public CharSequence getAccessibilityClassName() {
|
||
|
|
return FrameLayout.class.getName();
|
||
|
|
}
|
||
|
|
|
||
|
|
/** @hide */
|
||
|
|
@Override
|
||
|
|
protected void encodeProperties(@NonNull ViewHierarchyEncoder encoder) {
|
||
|
|
super.encodeProperties(encoder);
|
||
|
|
|
||
|
|
encoder.addProperty("measurement:measureAllChildren", mMeasureAllChildren);
|
||
|
|
encoder.addProperty("padding:foregroundPaddingLeft", mForegroundPaddingLeft);
|
||
|
|
encoder.addProperty("padding:foregroundPaddingTop", mForegroundPaddingTop);
|
||
|
|
encoder.addProperty("padding:foregroundPaddingRight", mForegroundPaddingRight);
|
||
|
|
encoder.addProperty("padding:foregroundPaddingBottom", mForegroundPaddingBottom);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Per-child layout information for layouts that support margins.
|
||
|
|
* See {@link android.R.styleable#FrameLayout_Layout FrameLayout Layout Attributes}
|
||
|
|
* for a list of all child view attributes that this class supports.
|
||
|
|
*
|
||
|
|
* @attr ref android.R.styleable#FrameLayout_Layout_layout_gravity
|
||
|
|
*/
|
||
|
|
public static class LayoutParams extends MarginLayoutParams {
|
||
|
|
/**
|
||
|
|
* Value for {@link #gravity} indicating that a gravity has not been
|
||
|
|
* explicitly specified.
|
||
|
|
*/
|
||
|
|
public static final int UNSPECIFIED_GRAVITY = -1;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* The gravity to apply with the View to which these layout parameters
|
||
|
|
* are associated.
|
||
|
|
* <p>
|
||
|
|
* The default value is {@link #UNSPECIFIED_GRAVITY}, which is treated
|
||
|
|
* by FrameLayout as {@code Gravity.TOP | Gravity.START}.
|
||
|
|
*
|
||
|
|
* @see android.view.Gravity
|
||
|
|
* @attr ref android.R.styleable#FrameLayout_Layout_layout_gravity
|
||
|
|
*/
|
||
|
|
@InspectableProperty(
|
||
|
|
name = "layout_gravity",
|
||
|
|
valueType = InspectableProperty.ValueType.GRAVITY)
|
||
|
|
public int gravity = UNSPECIFIED_GRAVITY;
|
||
|
|
|
||
|
|
public LayoutParams(@NonNull Context c, @Nullable AttributeSet attrs) {
|
||
|
|
super(c, attrs);
|
||
|
|
|
||
|
|
final TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.FrameLayout_Layout);
|
||
|
|
gravity = a.getInt(R.styleable.FrameLayout_Layout_layout_gravity, UNSPECIFIED_GRAVITY);
|
||
|
|
a.recycle();
|
||
|
|
}
|
||
|
|
|
||
|
|
public LayoutParams(int width, int height) {
|
||
|
|
super(width, height);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Creates a new set of layout parameters with the specified width, height
|
||
|
|
* and gravity.
|
||
|
|
*
|
||
|
|
* @param width the width, either {@link #MATCH_PARENT},
|
||
|
|
* {@link #WRAP_CONTENT} or a fixed size in pixels
|
||
|
|
* @param height the height, either {@link #MATCH_PARENT},
|
||
|
|
* {@link #WRAP_CONTENT} or a fixed size in pixels
|
||
|
|
* @param gravity the gravity
|
||
|
|
*
|
||
|
|
* @see android.view.Gravity
|
||
|
|
*/
|
||
|
|
public LayoutParams(int width, int height, int gravity) {
|
||
|
|
super(width, height);
|
||
|
|
this.gravity = gravity;
|
||
|
|
}
|
||
|
|
|
||
|
|
public LayoutParams(@NonNull ViewGroup.LayoutParams source) {
|
||
|
|
super(source);
|
||
|
|
}
|
||
|
|
|
||
|
|
public LayoutParams(@NonNull ViewGroup.MarginLayoutParams source) {
|
||
|
|
super(source);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Copy constructor. Clones the width, height, margin values, and
|
||
|
|
* gravity of the source.
|
||
|
|
*
|
||
|
|
* @param source The layout params to copy from.
|
||
|
|
*/
|
||
|
|
public LayoutParams(@NonNull LayoutParams source) {
|
||
|
|
super(source);
|
||
|
|
|
||
|
|
this.gravity = source.gravity;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|