1 /* 2 * Copyright (C) 2015 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 17 package android.view; 18 19 import android.graphics.RecordingCanvas; 20 import android.graphics.Rect; 21 22 /** 23 * These callbacks are used to communicate window configuration changes while the user is performing 24 * window changes. 25 * Note: Note that at the time of onWindowDragResizeStart the content size isn't known. A consumer 26 * should therfore not draw anything before the additional onContentDraw call has arrived. 27 * @hide 28 */ 29 public interface WindowCallbacks { 30 31 /** 32 * Called by the system when the window got changed by the user, before the layouter got called. 33 * It also gets called when the insets changed, or when the window switched between a fullscreen 34 * layout or a non-fullscreen layout. It can be used to perform a "quick and dirty" resize which 35 * should never take more then 4ms to complete. 36 * 37 * <p>At the time the layouting has not happened yet. 38 * 39 * @param newBounds The new window frame bounds. 40 * @param fullscreen Whether the window is currently drawing in fullscreen. 41 * @param systemInsets The current visible system insets for the window. 42 * @param stableInsets The stable insets for the window. 43 */ onWindowSizeIsChanging(Rect newBounds, boolean fullscreen, Rect systemInsets, Rect stableInsets)44 void onWindowSizeIsChanging(Rect newBounds, boolean fullscreen, Rect systemInsets, 45 Rect stableInsets); 46 47 /** 48 * Called when a drag resize starts. 49 * 50 * @param initialBounds The initial bounds where the window will be. 51 * @param fullscreen Whether the window is currently drawing in fullscreen. 52 * @param systemInsets The current visible system insets for the window. 53 * @param stableInsets The stable insets for the window. 54 */ onWindowDragResizeStart(Rect initialBounds, boolean fullscreen, Rect systemInsets, Rect stableInsets)55 void onWindowDragResizeStart(Rect initialBounds, boolean fullscreen, Rect systemInsets, 56 Rect stableInsets); 57 58 /** 59 * Called when a drag resize ends. 60 */ onWindowDragResizeEnd()61 void onWindowDragResizeEnd(); 62 63 /** 64 * The content will now be drawn to these bounds. Returns true if 65 * a draw should be requested after the next content draw. 66 */ onContentDrawn(int offsetX, int offsetY, int sizeX, int sizeY)67 boolean onContentDrawn(int offsetX, int offsetY, int sizeX, int sizeY); 68 69 /** 70 * Called to request the window to draw one frame. 71 * @param reportNextDraw Whether it should report when the requested draw finishes. 72 */ onRequestDraw(boolean reportNextDraw)73 void onRequestDraw(boolean reportNextDraw); 74 75 /** 76 * Called after all the content has drawn and the callback now has the ability to draw something 77 * on top of everything. Call {@link ViewRootImpl#requestInvalidateRootRenderNode} when this 78 * content needs to be redrawn. 79 * 80 * @param canvas The canvas to draw on. 81 */ onPostDraw(RecordingCanvas canvas)82 void onPostDraw(RecordingCanvas canvas); 83 } 84