| /* |
| * Copyright (C) 2015 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.server.wm; |
| |
| import android.util.Slog; |
| import android.view.Display; |
| |
| import java.util.ArrayDeque; |
| import java.util.function.Consumer; |
| |
| import static android.app.ActivityManager.StackId.ASSISTANT_STACK_ID; |
| import static android.app.ActivityManager.StackId.DOCKED_STACK_ID; |
| import static android.app.ActivityManager.StackId.PINNED_STACK_ID; |
| import static android.view.Display.DEFAULT_DISPLAY; |
| import static android.view.WindowManager.LayoutParams.TYPE_DOCK_DIVIDER; |
| import static com.android.server.wm.WindowManagerDebugConfig.DEBUG_LAYERS; |
| import static com.android.server.wm.WindowManagerDebugConfig.TAG_WM; |
| import static com.android.server.wm.WindowManagerService.WINDOW_LAYER_MULTIPLIER; |
| |
| /** |
| * Controller for assigning layers to windows on the display. |
| * |
| * This class encapsulates general algorithm for assigning layers and special rules that we need to |
| * apply on top. The general algorithm goes through windows from bottom to the top and the higher |
| * the window is, the higher layer is assigned. The final layer is equal to base layer + |
| * adjustment from the order. This means that the window list is assumed to be ordered roughly by |
| * the base layer (there are exceptions, e.g. due to keyguard and wallpaper and they need to be |
| * handled with care, because they break the algorithm). |
| * |
| * On top of the general algorithm we add special rules, that govern such amazing things as: |
| * <li>IME (which has higher base layer, but will be positioned above application windows)</li> |
| * <li>docked/pinned windows (that need to be lifted above other application windows, including |
| * animations) |
| * <li>dock divider (which needs to live above applications, but below IME)</li> |
| * <li>replaced windows, which need to live above their normal level, because they anticipate |
| * an animation</li>. |
| */ |
| class WindowLayersController { |
| private final WindowManagerService mService; |
| |
| WindowLayersController(WindowManagerService service) { |
| mService = service; |
| } |
| |
| private int mHighestApplicationLayer = 0; |
| private ArrayDeque<WindowState> mPinnedWindows = new ArrayDeque<>(); |
| private ArrayDeque<WindowState> mDockedWindows = new ArrayDeque<>(); |
| private ArrayDeque<WindowState> mAssistantWindows = new ArrayDeque<>(); |
| private ArrayDeque<WindowState> mInputMethodWindows = new ArrayDeque<>(); |
| private WindowState mDockDivider = null; |
| private ArrayDeque<WindowState> mReplacingWindows = new ArrayDeque<>(); |
| private int mCurBaseLayer; |
| private int mCurLayer; |
| private boolean mAnyLayerChanged; |
| private int mHighestLayerInImeTargetBaseLayer; |
| private WindowState mImeTarget; |
| private boolean mAboveImeTarget; |
| private ArrayDeque<WindowState> mAboveImeTargetAppWindows = new ArrayDeque(); |
| |
| private final Consumer<WindowState> mAssignWindowLayersConsumer = w -> { |
| boolean layerChanged = false; |
| |
| int oldLayer = w.mLayer; |
| if (w.mBaseLayer == mCurBaseLayer) { |
| mCurLayer += WINDOW_LAYER_MULTIPLIER; |
| } else { |
| mCurBaseLayer = mCurLayer = w.mBaseLayer; |
| } |
| assignAnimLayer(w, mCurLayer); |
| |
| // TODO: Preserved old behavior of code here but not sure comparing oldLayer to |
| // mAnimLayer and mLayer makes sense...though the worst case would be unintentional |
| // layer reassignment. |
| if (w.mLayer != oldLayer || w.mWinAnimator.mAnimLayer != oldLayer) { |
| layerChanged = true; |
| mAnyLayerChanged = true; |
| } |
| |
| if (w.mAppToken != null) { |
| mHighestApplicationLayer = Math.max(mHighestApplicationLayer, |
| w.mWinAnimator.mAnimLayer); |
| } |
| if (mImeTarget != null && w.mBaseLayer == mImeTarget.mBaseLayer) { |
| mHighestLayerInImeTargetBaseLayer = Math.max(mHighestLayerInImeTargetBaseLayer, |
| w.mWinAnimator.mAnimLayer); |
| } |
| |
| collectSpecialWindows(w); |
| |
| if (layerChanged) { |
| w.scheduleAnimationIfDimming(); |
| } |
| }; |
| |
| final void assignWindowLayers(DisplayContent dc) { |
| if (DEBUG_LAYERS) Slog.v(TAG_WM, "Assigning layers based", |
| new RuntimeException("here").fillInStackTrace()); |
| |
| reset(); |
| dc.forAllWindows(mAssignWindowLayersConsumer, false /* traverseTopToBottom */); |
| |
| adjustSpecialWindows(); |
| |
| //TODO (multidisplay): Magnification is supported only for the default display. |
| if (mService.mAccessibilityController != null && mAnyLayerChanged |
| && dc.getDisplayId() == DEFAULT_DISPLAY) { |
| mService.mAccessibilityController.onWindowLayersChangedLocked(); |
| } |
| |
| if (DEBUG_LAYERS) logDebugLayers(dc); |
| } |
| |
| private void logDebugLayers(DisplayContent dc) { |
| dc.forAllWindows((w) -> { |
| final WindowStateAnimator winAnimator = w.mWinAnimator; |
| Slog.v(TAG_WM, "Assign layer " + w + ": " + "mBase=" + w.mBaseLayer |
| + " mLayer=" + w.mLayer + (w.mAppToken == null |
| ? "" : " mAppLayer=" + w.mAppToken.getAnimLayerAdjustment()) |
| + " =mAnimLayer=" + winAnimator.mAnimLayer); |
| }, false /* traverseTopToBottom */); |
| } |
| |
| private void reset() { |
| mHighestApplicationLayer = 0; |
| mPinnedWindows.clear(); |
| mInputMethodWindows.clear(); |
| mDockedWindows.clear(); |
| mAssistantWindows.clear(); |
| mReplacingWindows.clear(); |
| mDockDivider = null; |
| |
| mCurBaseLayer = 0; |
| mCurLayer = 0; |
| mAnyLayerChanged = false; |
| |
| mImeTarget = mService.mInputMethodTarget; |
| mHighestLayerInImeTargetBaseLayer = (mImeTarget != null) ? mImeTarget.mBaseLayer : 0; |
| mAboveImeTarget = false; |
| mAboveImeTargetAppWindows.clear(); |
| } |
| |
| private void collectSpecialWindows(WindowState w) { |
| if (w.mAttrs.type == TYPE_DOCK_DIVIDER) { |
| mDockDivider = w; |
| return; |
| } |
| if (w.mWillReplaceWindow) { |
| mReplacingWindows.add(w); |
| } |
| if (w.mIsImWindow) { |
| mInputMethodWindows.add(w); |
| return; |
| } |
| if (mImeTarget != null) { |
| if (w.getParentWindow() == mImeTarget && w.mSubLayer > 0) { |
| // Child windows of the ime target with a positive sub-layer should be placed above |
| // the IME. |
| mAboveImeTargetAppWindows.add(w); |
| } else if (mAboveImeTarget && w.mAppToken != null) { |
| // windows of apps above the IME target should be placed above the IME. |
| mAboveImeTargetAppWindows.add(w); |
| } |
| if (w == mImeTarget) { |
| mAboveImeTarget = true; |
| } |
| } |
| |
| final Task task = w.getTask(); |
| if (task == null) { |
| return; |
| } |
| final TaskStack stack = task.mStack; |
| if (stack == null) { |
| return; |
| } |
| if (stack.mStackId == PINNED_STACK_ID) { |
| mPinnedWindows.add(w); |
| } else if (stack.mStackId == DOCKED_STACK_ID) { |
| mDockedWindows.add(w); |
| } else if (stack.mStackId == ASSISTANT_STACK_ID) { |
| mAssistantWindows.add(w); |
| } |
| } |
| |
| private void adjustSpecialWindows() { |
| int layer = mHighestApplicationLayer + WINDOW_LAYER_MULTIPLIER; |
| // For pinned and docked stack window, we want to make them above other windows also when |
| // these windows are animating. |
| while (!mDockedWindows.isEmpty()) { |
| layer = assignAndIncreaseLayerIfNeeded(mDockedWindows.remove(), layer); |
| } |
| |
| layer = assignAndIncreaseLayerIfNeeded(mDockDivider, layer); |
| |
| // We know that we will be animating a relaunching window in the near future, which will |
| // receive a z-order increase. We want the replaced window to immediately receive the same |
| // treatment, e.g. to be above the dock divider. |
| while (!mReplacingWindows.isEmpty()) { |
| layer = assignAndIncreaseLayerIfNeeded(mReplacingWindows.remove(), layer); |
| } |
| |
| // Adjust the assistant stack windows to be above the docked and fullscreen stack windows, |
| // but under the pinned stack windows |
| while (!mAssistantWindows.isEmpty()) { |
| layer = assignAndIncreaseLayerIfNeeded(mAssistantWindows.remove(), layer); |
| } |
| |
| while (!mPinnedWindows.isEmpty()) { |
| layer = assignAndIncreaseLayerIfNeeded(mPinnedWindows.remove(), layer); |
| } |
| |
| // Make sure IME is the highest window in the base layer of it's target. |
| if (mImeTarget != null) { |
| if (mImeTarget.mAppToken == null) { |
| // For non-app ime targets adjust the layer we start from to match what we found |
| // when assigning layers. Otherwise, just use the highest app layer we have some far. |
| layer = mHighestLayerInImeTargetBaseLayer + WINDOW_LAYER_MULTIPLIER; |
| } |
| |
| while (!mInputMethodWindows.isEmpty()) { |
| layer = assignAndIncreaseLayerIfNeeded(mInputMethodWindows.remove(), layer); |
| } |
| |
| // Adjust app windows the should be displayed above the IME since they are above the IME |
| // target. |
| while (!mAboveImeTargetAppWindows.isEmpty()) { |
| layer = assignAndIncreaseLayerIfNeeded(mAboveImeTargetAppWindows.remove(), layer); |
| } |
| } |
| |
| } |
| |
| private int assignAndIncreaseLayerIfNeeded(WindowState win, int layer) { |
| if (win != null) { |
| assignAnimLayer(win, layer); |
| // Make sure we leave space in-between normal windows for dims and such. |
| layer += WINDOW_LAYER_MULTIPLIER; |
| } |
| return layer; |
| } |
| |
| private void assignAnimLayer(WindowState w, int layer) { |
| w.mLayer = layer; |
| w.mWinAnimator.mAnimLayer = w.getAnimLayerAdjustment() |
| + w.getSpecialWindowAnimLayerAdjustment(); |
| if (w.mAppToken != null && w.mAppToken.mAppAnimator.thumbnailForceAboveLayer > 0) { |
| if (w.mWinAnimator.mAnimLayer > w.mAppToken.mAppAnimator.thumbnailForceAboveLayer) { |
| w.mAppToken.mAppAnimator.thumbnailForceAboveLayer = w.mWinAnimator.mAnimLayer; |
| } |
| // TODO(b/62029108): the entire contents of the if statement should call the refactored |
| // function to set the thumbnail layer for w.AppToken |
| int highestLayer = w.mAppToken.getHighestAnimLayer(); |
| if (highestLayer > 0) { |
| if (w.mAppToken.mAppAnimator.thumbnail != null |
| && w.mAppToken.mAppAnimator.thumbnailForceAboveLayer != highestLayer) { |
| w.mAppToken.mAppAnimator.thumbnailForceAboveLayer = highestLayer; |
| w.mAppToken.mAppAnimator.thumbnail.setLayer(highestLayer + 1); |
| } |
| } |
| } |
| } |
| } |