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      1 /*
      2  * Copyright (C) 2018 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 package com.android.systemui.shared.system;
     17 
     18 import android.graphics.Canvas;
     19 import android.graphics.Rect;
     20 import android.view.DisplayListCanvas;
     21 import android.view.View;
     22 import android.view.ViewRootImpl;
     23 import android.view.WindowCallbacks;
     24 
     25 public class WindowCallbacksCompat {
     26 
     27     private final WindowCallbacks mWindowCallbacks = new WindowCallbacks() {
     28         @Override
     29         public void onWindowSizeIsChanging(Rect newBounds, boolean fullscreen, Rect systemInsets,
     30                 Rect stableInsets) {
     31             WindowCallbacksCompat.this.onWindowSizeIsChanging(newBounds, fullscreen, systemInsets,
     32                     stableInsets);
     33         }
     34 
     35         @Override
     36         public void onWindowDragResizeStart(Rect initialBounds, boolean fullscreen,
     37                 Rect systemInsets, Rect stableInsets, int resizeMode) {
     38             WindowCallbacksCompat.this.onWindowDragResizeStart(initialBounds, fullscreen,
     39                     systemInsets, stableInsets, resizeMode);
     40         }
     41 
     42         @Override
     43         public void onWindowDragResizeEnd() {
     44             WindowCallbacksCompat.this.onWindowDragResizeEnd();
     45         }
     46 
     47         @Override
     48         public boolean onContentDrawn(int offsetX, int offsetY, int sizeX, int sizeY) {
     49             return WindowCallbacksCompat.this.onContentDrawn(offsetX, offsetY, sizeX, sizeY);
     50         }
     51 
     52         @Override
     53         public void onRequestDraw(boolean reportNextDraw) {
     54             WindowCallbacksCompat.this.onRequestDraw(reportNextDraw);
     55         }
     56 
     57         @Override
     58         public void onPostDraw(DisplayListCanvas canvas) {
     59             WindowCallbacksCompat.this.onPostDraw(canvas);
     60         }
     61     };
     62 
     63     private final View mView;
     64 
     65     public WindowCallbacksCompat(View view) {
     66         mView = view;
     67     }
     68 
     69     public void onWindowSizeIsChanging(Rect newBounds, boolean fullscreen, Rect systemInsets,
     70             Rect stableInsets) { }
     71 
     72     public void onWindowDragResizeStart(Rect initialBounds, boolean fullscreen, Rect systemInsets,
     73             Rect stableInsets, int resizeMode) { }
     74 
     75     public void onWindowDragResizeEnd() { }
     76 
     77     public boolean onContentDrawn(int offsetX, int offsetY, int sizeX, int sizeY) {
     78         return false;
     79     }
     80 
     81     public void onRequestDraw(boolean reportNextDraw) {
     82         if (reportNextDraw) {
     83             reportDrawFinish();
     84         }
     85     }
     86 
     87     public void onPostDraw(Canvas canvas) { }
     88 
     89     public void reportDrawFinish() {
     90         mView.getViewRootImpl().reportDrawFinish();
     91     }
     92 
     93     public boolean attach() {
     94         ViewRootImpl root = mView.getViewRootImpl();
     95         if (root != null) {
     96             root.addWindowCallbacks(mWindowCallbacks);
     97             root.requestInvalidateRootRenderNode();
     98             return true;
     99         }
    100         return false;
    101     }
    102 
    103     public void detach() {
    104         ViewRootImpl root = mView.getViewRootImpl();
    105         if (root != null) {
    106             root.removeWindowCallbacks(mWindowCallbacks);
    107         }
    108     }
    109 }
    110