| /* |
| * 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.systemui.recents.views; |
| |
| import android.content.Context; |
| import android.graphics.Rect; |
| import android.util.AttributeSet; |
| import android.widget.FrameLayout; |
| |
| /** |
| * This is an optimized FrameLayout whose layout is completely directed by its parent, and as a |
| * result, does not propagate <code>requestLayout()</code> up the view hierarchy. Instead, it will |
| * relayout its children with the last known layout bounds when a layout is requested from a child |
| * view. |
| */ |
| public class FixedSizeFrameLayout extends FrameLayout { |
| |
| private final Rect mLayoutBounds = new Rect(); |
| |
| public FixedSizeFrameLayout(Context context) { |
| super(context); |
| } |
| |
| public FixedSizeFrameLayout(Context context, AttributeSet attrs) { |
| super(context, attrs); |
| } |
| |
| public FixedSizeFrameLayout(Context context, AttributeSet attrs, int defStyleAttr) { |
| super(context, attrs, defStyleAttr); |
| } |
| |
| public FixedSizeFrameLayout(Context context, AttributeSet attrs, int defStyleAttr, |
| int defStyleRes) { |
| super(context, attrs, defStyleAttr, defStyleRes); |
| } |
| |
| @Override |
| protected final void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { |
| measureContents(MeasureSpec.getSize(widthMeasureSpec), |
| MeasureSpec.getSize(heightMeasureSpec)); |
| } |
| |
| @Override |
| protected final void onLayout(boolean changed, int left, int top, int right, int bottom) { |
| mLayoutBounds.set(left, top, right, bottom); |
| layoutContents(mLayoutBounds, changed); |
| } |
| |
| @Override |
| public final void requestLayout() { |
| // The base ViewGroup constructor attempts to call requestLayout() before this class's |
| // members are initialized so we should just propagate in that case |
| if (mLayoutBounds == null || mLayoutBounds.isEmpty()) { |
| super.requestLayout(); |
| } else { |
| // If we are already laid out, then just reuse the same bounds to layout the children |
| // (but not itself) |
| // TODO: Investigate whether we should coalesce these to the next frame if needed |
| measureContents(getMeasuredWidth(), getMeasuredHeight()); |
| layoutContents(mLayoutBounds, false); |
| } |
| } |
| |
| /** |
| * Measures the contents of this fixed layout. |
| */ |
| protected void measureContents(int width, int height) { |
| super.onMeasure(MeasureSpec.makeMeasureSpec(width, MeasureSpec.AT_MOST), |
| MeasureSpec.makeMeasureSpec(height, MeasureSpec.AT_MOST)); |
| } |
| |
| /** |
| * Lays out the contents of this fixed layout. |
| */ |
| protected void layoutContents(Rect bounds, boolean changed) { |
| super.onLayout(changed, bounds.left, bounds.top, bounds.right, bounds.bottom); |
| |
| int width = getMeasuredWidth(); |
| int height = getMeasuredHeight(); |
| onSizeChanged(width, height, width, height); |
| } |
| |
| } |