422 lines
16 KiB
Java
422 lines
16 KiB
Java
/*
|
|
* Copyright (C) 2016 The Android Open Source Project
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License
|
|
*/
|
|
|
|
package com.android.internal.widget;
|
|
|
|
import static android.widget.flags.Flags.messagingChildRequestLayout;
|
|
|
|
import android.annotation.Nullable;
|
|
import android.annotation.Px;
|
|
import android.content.Context;
|
|
import android.content.res.TypedArray;
|
|
import android.graphics.Canvas;
|
|
import android.os.Build;
|
|
import android.os.Trace;
|
|
import android.util.AttributeSet;
|
|
import android.view.RemotableViewMethod;
|
|
import android.view.View;
|
|
import android.view.ViewGroup;
|
|
import android.view.ViewParent;
|
|
import android.widget.RemoteViews;
|
|
|
|
import com.android.internal.R;
|
|
|
|
/**
|
|
* A custom-built layout for the Notification.MessagingStyle.
|
|
*
|
|
* Evicts children until they all fit.
|
|
*/
|
|
@RemoteViews.RemoteView
|
|
public class MessagingLinearLayout extends ViewGroup {
|
|
|
|
/**
|
|
* Spacing to be applied between views.
|
|
*/
|
|
private int mSpacing;
|
|
|
|
private int mMaxDisplayedLines = Integer.MAX_VALUE;
|
|
|
|
private static final boolean TRACE_ONMEASURE = Build.isDebuggable();
|
|
|
|
public MessagingLinearLayout(Context context, @Nullable AttributeSet attrs) {
|
|
super(context, attrs);
|
|
|
|
final TypedArray a = context.obtainStyledAttributes(attrs,
|
|
R.styleable.MessagingLinearLayout, 0,
|
|
0);
|
|
|
|
final int N = a.getIndexCount();
|
|
for (int i = 0; i < N; i++) {
|
|
int attr = a.getIndex(i);
|
|
switch (attr) {
|
|
case R.styleable.MessagingLinearLayout_spacing:
|
|
mSpacing = a.getDimensionPixelSize(i, 0);
|
|
break;
|
|
}
|
|
}
|
|
|
|
a.recycle();
|
|
}
|
|
|
|
@Override
|
|
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
|
|
if (TRACE_ONMEASURE) {
|
|
Trace.beginSection("MessagingLinearLayout#onMeasure");
|
|
trackMeasureSpecs(widthMeasureSpec, heightMeasureSpec);
|
|
}
|
|
// This is essentially a bottom-up linear layout that only adds children that fit entirely
|
|
// up to a maximum height.
|
|
int targetHeight = MeasureSpec.getSize(heightMeasureSpec);
|
|
switch (MeasureSpec.getMode(heightMeasureSpec)) {
|
|
case MeasureSpec.UNSPECIFIED:
|
|
targetHeight = Integer.MAX_VALUE;
|
|
break;
|
|
}
|
|
|
|
// Now that we know which views to take, fix up the indents and see what width we get.
|
|
int measuredWidth = mPaddingLeft + mPaddingRight;
|
|
final int count = getChildCount();
|
|
int totalHeight;
|
|
for (int i = 0; i < count; ++i) {
|
|
final View child = getChildAt(i);
|
|
final LayoutParams lp = (LayoutParams) child.getLayoutParams();
|
|
lp.hide = true;
|
|
// Child always needs to be measured to calculate hide property correctly in onMeasure.
|
|
if (messagingChildRequestLayout()) {
|
|
child.requestLayout();
|
|
}
|
|
if (child instanceof MessagingChild) {
|
|
MessagingChild messagingChild = (MessagingChild) child;
|
|
// Whenever we encounter the message first, it's always first in the layout
|
|
messagingChild.setIsFirstInLayout(true);
|
|
}
|
|
}
|
|
|
|
totalHeight = mPaddingTop + mPaddingBottom;
|
|
boolean first = true;
|
|
int linesRemaining = mMaxDisplayedLines;
|
|
// Starting from the bottom: we measure every view as if it were the only one. If it still
|
|
// fits, we take it, otherwise we stop there.
|
|
MessagingChild previousChild = null;
|
|
View previousView = null;
|
|
int previousChildHeight = 0;
|
|
int previousTotalHeight = 0;
|
|
int previousLinesConsumed = 0;
|
|
for (int i = count - 1; i >= 0 && totalHeight < targetHeight; i--) {
|
|
if (getChildAt(i).getVisibility() == GONE) {
|
|
continue;
|
|
}
|
|
final View child = getChildAt(i);
|
|
LayoutParams lp = (LayoutParams) getChildAt(i).getLayoutParams();
|
|
MessagingChild messagingChild = null;
|
|
int spacing = mSpacing;
|
|
int previousChildIncrease = 0;
|
|
if (child instanceof MessagingChild) {
|
|
// We need to remeasure the previous child again if it's not the first anymore
|
|
if (previousChild != null && previousChild.hasDifferentHeightWhenFirst()) {
|
|
previousChild.setIsFirstInLayout(false);
|
|
measureChildWithMargins(previousView, widthMeasureSpec, 0, heightMeasureSpec,
|
|
previousTotalHeight - previousChildHeight);
|
|
previousChildIncrease = previousView.getMeasuredHeight() - previousChildHeight;
|
|
linesRemaining -= previousChild.getConsumedLines() - previousLinesConsumed;
|
|
}
|
|
messagingChild = (MessagingChild) child;
|
|
messagingChild.setMaxDisplayedLines(linesRemaining);
|
|
spacing += messagingChild.getExtraSpacing();
|
|
}
|
|
spacing = first ? 0 : spacing;
|
|
measureChildWithMargins(child, widthMeasureSpec, 0, heightMeasureSpec, totalHeight
|
|
- mPaddingTop - mPaddingBottom + spacing);
|
|
|
|
final int childHeight = child.getMeasuredHeight();
|
|
int newHeight = Math.max(totalHeight, totalHeight + childHeight + lp.topMargin +
|
|
lp.bottomMargin + spacing + previousChildIncrease);
|
|
int measureType = MessagingChild.MEASURED_NORMAL;
|
|
if (messagingChild != null) {
|
|
measureType = messagingChild.getMeasuredType();
|
|
}
|
|
|
|
// We never measure the first item as too small, we want to at least show something.
|
|
boolean isTooSmall = measureType == MessagingChild.MEASURED_TOO_SMALL && !first;
|
|
boolean isShortened = measureType == MessagingChild.MEASURED_SHORTENED
|
|
|| measureType == MessagingChild.MEASURED_TOO_SMALL && first;
|
|
boolean showView = newHeight <= targetHeight && !isTooSmall;
|
|
if (showView) {
|
|
if (messagingChild != null) {
|
|
previousLinesConsumed = messagingChild.getConsumedLines();
|
|
linesRemaining -= previousLinesConsumed;
|
|
previousChild = messagingChild;
|
|
previousView = child;
|
|
previousChildHeight = childHeight;
|
|
previousTotalHeight = totalHeight;
|
|
}
|
|
totalHeight = newHeight;
|
|
measuredWidth = Math.max(measuredWidth,
|
|
child.getMeasuredWidth() + lp.leftMargin + lp.rightMargin
|
|
+ mPaddingLeft + mPaddingRight);
|
|
lp.hide = false;
|
|
if (isShortened || linesRemaining <= 0) {
|
|
break;
|
|
}
|
|
} else {
|
|
// We now became too short, let's make sure to reset any previous views to be first
|
|
// and remeasure it.
|
|
if (previousChild != null && previousChild.hasDifferentHeightWhenFirst()) {
|
|
previousChild.setIsFirstInLayout(true);
|
|
// We need to remeasure the previous child again since it became first
|
|
measureChildWithMargins(previousView, widthMeasureSpec, 0, heightMeasureSpec,
|
|
previousTotalHeight - previousChildHeight);
|
|
// The totalHeight is already correct here since we only set it during the
|
|
// first pass
|
|
}
|
|
break;
|
|
}
|
|
first = false;
|
|
}
|
|
|
|
setMeasuredDimension(
|
|
resolveSize(Math.max(getSuggestedMinimumWidth(), measuredWidth),
|
|
widthMeasureSpec),
|
|
Math.max(getSuggestedMinimumHeight(), totalHeight));
|
|
if (TRACE_ONMEASURE) {
|
|
Trace.endSection();
|
|
}
|
|
}
|
|
|
|
@Override
|
|
protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
|
|
final int paddingLeft = mPaddingLeft;
|
|
|
|
int childTop;
|
|
|
|
// Where right end of child should go
|
|
final int width = right - left;
|
|
final int childRight = width - mPaddingRight;
|
|
|
|
final int layoutDirection = getLayoutDirection();
|
|
final int count = getChildCount();
|
|
|
|
childTop = mPaddingTop;
|
|
|
|
boolean first = true;
|
|
final boolean shown = isShown();
|
|
for (int i = 0; i < count; i++) {
|
|
final View child = getChildAt(i);
|
|
if (child.getVisibility() == GONE) {
|
|
continue;
|
|
}
|
|
final LayoutParams lp = (LayoutParams) child.getLayoutParams();
|
|
MessagingChild messagingChild = (MessagingChild) child;
|
|
|
|
final int childWidth = child.getMeasuredWidth();
|
|
final int childHeight = child.getMeasuredHeight();
|
|
|
|
int childLeft;
|
|
if (layoutDirection == LAYOUT_DIRECTION_RTL) {
|
|
childLeft = childRight - childWidth - lp.rightMargin;
|
|
} else {
|
|
childLeft = paddingLeft + lp.leftMargin;
|
|
}
|
|
if (lp.hide) {
|
|
if (shown && lp.visibleBefore) {
|
|
// We still want to lay out the child to have great animations
|
|
child.layout(childLeft, childTop, childLeft + childWidth,
|
|
childTop + lp.lastVisibleHeight);
|
|
messagingChild.hideAnimated();
|
|
}
|
|
lp.visibleBefore = false;
|
|
continue;
|
|
} else {
|
|
lp.visibleBefore = true;
|
|
lp.lastVisibleHeight = childHeight;
|
|
}
|
|
|
|
if (!first) {
|
|
childTop += mSpacing;
|
|
}
|
|
|
|
childTop += lp.topMargin;
|
|
child.layout(childLeft, childTop, childLeft + childWidth, childTop + childHeight);
|
|
|
|
childTop += childHeight + lp.bottomMargin;
|
|
|
|
first = false;
|
|
}
|
|
}
|
|
|
|
private void trackMeasureSpecs(int widthMeasureSpec, int heightMeasureSpec) {
|
|
if (!TRACE_ONMEASURE) {
|
|
return;
|
|
}
|
|
|
|
final int availableWidth = MeasureSpec.getSize(widthMeasureSpec);
|
|
final int widthMode = MeasureSpec.getMode(widthMeasureSpec);
|
|
final int availableHeight = MeasureSpec.getSize(heightMeasureSpec);
|
|
final int heightMode = MeasureSpec.getMode(heightMeasureSpec);
|
|
Trace.setCounter("MessagingLinearLayout#onMeasure_widthMeasureSpecSize",
|
|
availableWidth);
|
|
Trace.setCounter("MessagingLinearLayout#onMeasure_widthMeasureSpecMode",
|
|
widthMode);
|
|
Trace.setCounter("MessagingLinearLayout#onMeasure_heightMeasureSpecSize",
|
|
availableHeight);
|
|
Trace.setCounter("MessagingLinearLayout#onMeasure_heightMeasureSpecMode",
|
|
heightMode);
|
|
}
|
|
|
|
@Override
|
|
protected boolean drawChild(Canvas canvas, View child, long drawingTime) {
|
|
final LayoutParams lp = (LayoutParams) child.getLayoutParams();
|
|
if (lp.hide) {
|
|
MessagingChild messagingChild = (MessagingChild) child;
|
|
if (!messagingChild.isHidingAnimated()) {
|
|
return true;
|
|
}
|
|
}
|
|
return super.drawChild(canvas, child, drawingTime);
|
|
}
|
|
|
|
/**
|
|
* Set the spacing to be applied between views.
|
|
*/
|
|
public void setSpacing(@Px int spacing) {
|
|
if (mSpacing != spacing) {
|
|
mSpacing = spacing;
|
|
requestLayout();
|
|
}
|
|
}
|
|
|
|
@Override
|
|
public LayoutParams generateLayoutParams(AttributeSet attrs) {
|
|
return new LayoutParams(mContext, attrs);
|
|
}
|
|
|
|
@Override
|
|
protected LayoutParams generateDefaultLayoutParams() {
|
|
return new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
|
|
|
|
}
|
|
|
|
@Override
|
|
protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams lp) {
|
|
LayoutParams copy = new LayoutParams(lp.width, lp.height);
|
|
if (lp instanceof MarginLayoutParams) {
|
|
copy.copyMarginsFrom((MarginLayoutParams) lp);
|
|
}
|
|
return copy;
|
|
}
|
|
|
|
public static boolean isGone(View view) {
|
|
if (view.getVisibility() == View.GONE) {
|
|
return true;
|
|
}
|
|
final ViewGroup.LayoutParams lp = view.getLayoutParams();
|
|
if (lp instanceof MessagingLinearLayout.LayoutParams
|
|
&& ((MessagingLinearLayout.LayoutParams) lp).hide) {
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Sets how many lines should be displayed at most
|
|
*/
|
|
@RemotableViewMethod
|
|
public void setMaxDisplayedLines(int numberLines) {
|
|
mMaxDisplayedLines = numberLines;
|
|
}
|
|
|
|
public IMessagingLayout getMessagingLayout() {
|
|
View view = this;
|
|
while (true) {
|
|
ViewParent p = view.getParent();
|
|
if (p instanceof View) {
|
|
view = (View) p;
|
|
if (view instanceof IMessagingLayout) {
|
|
return (IMessagingLayout) view;
|
|
}
|
|
} else {
|
|
return null;
|
|
}
|
|
}
|
|
}
|
|
|
|
@Override
|
|
public int getBaseline() {
|
|
// When placed in a horizontal linear layout (as is the case in a single-line MessageGroup),
|
|
// align with the last visible child (which is the one that will be displayed in the single-
|
|
// line group.
|
|
int childCount = getChildCount();
|
|
for (int i = childCount - 1; i >= 0; i--) {
|
|
final View child = getChildAt(i);
|
|
if (isGone(child)) {
|
|
continue;
|
|
}
|
|
final int childBaseline = child.getBaseline();
|
|
if (childBaseline == -1) {
|
|
return -1;
|
|
}
|
|
MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams();
|
|
return lp.topMargin + childBaseline;
|
|
}
|
|
return super.getBaseline();
|
|
}
|
|
|
|
public interface MessagingChild {
|
|
int MEASURED_NORMAL = 0;
|
|
int MEASURED_SHORTENED = 1;
|
|
int MEASURED_TOO_SMALL = 2;
|
|
|
|
int getMeasuredType();
|
|
int getConsumedLines();
|
|
void setMaxDisplayedLines(int lines);
|
|
void hideAnimated();
|
|
boolean isHidingAnimated();
|
|
|
|
/**
|
|
* Set that this view is first in layout. Relevant and only set if
|
|
* {@link #hasDifferentHeightWhenFirst()}.
|
|
* @param first is this first?
|
|
*/
|
|
default void setIsFirstInLayout(boolean first) {}
|
|
|
|
/**
|
|
* @return if this layout has different height it is first in the layout
|
|
*/
|
|
default boolean hasDifferentHeightWhenFirst() {
|
|
return false;
|
|
}
|
|
default int getExtraSpacing() {
|
|
return 0;
|
|
}
|
|
void recycle();
|
|
}
|
|
|
|
public static class LayoutParams extends MarginLayoutParams {
|
|
|
|
public boolean hide = false;
|
|
public boolean visibleBefore = false;
|
|
public int lastVisibleHeight;
|
|
|
|
public LayoutParams(Context c, AttributeSet attrs) {
|
|
super(c, attrs);
|
|
}
|
|
|
|
public LayoutParams(int width, int height) {
|
|
super(width, height);
|
|
}
|
|
}
|
|
}
|