| /* |
| * Copyright (C) 2020 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.car.rotary; |
| |
| import android.view.accessibility.AccessibilityNodeInfo; |
| |
| import androidx.annotation.NonNull; |
| import androidx.annotation.Nullable; |
| import androidx.annotation.VisibleForTesting; |
| |
| import java.util.HashMap; |
| import java.util.Map; |
| import java.util.Stack; |
| |
| /** Cache of window type and most recently focused node for each window ID. */ |
| class WindowCache { |
| /** Window IDs. */ |
| private final Stack<Integer> mWindowIds; |
| /** Window types keyed by window IDs. */ |
| private final Map<Integer, Integer> mWindowTypes; |
| /** Most recent focused nodes keyed by window IDs. */ |
| private final Map<Integer, AccessibilityNodeInfo> mFocusedNodes; |
| |
| @NonNull |
| private NodeCopier mNodeCopier = new NodeCopier(); |
| |
| WindowCache() { |
| mWindowIds = new Stack<>(); |
| mWindowTypes = new HashMap<>(); |
| mFocusedNodes = new HashMap<>(); |
| } |
| |
| /** |
| * Saves the focused node of the given window, removing the existing entry, if any. This method |
| * should be called when the focused node changed. |
| */ |
| void saveFocusedNode(int windowId, @NonNull AccessibilityNodeInfo focusedNode) { |
| if (mFocusedNodes.containsKey(windowId)) { |
| // Call remove(Integer) to remove. |
| AccessibilityNodeInfo oldNode = mFocusedNodes.remove(windowId); |
| oldNode.recycle(); |
| } |
| mFocusedNodes.put(windowId, copyNode(focusedNode)); |
| } |
| |
| /** |
| * Saves the type of the given window, removing the existing entry, if any. This method should |
| * be called when a window was just added. |
| */ |
| void saveWindowType(int windowId, int windowType) { |
| Integer id = windowId; |
| if (mWindowIds.contains(id)) { |
| // Call remove(Integer) to remove. |
| mWindowIds.remove(id); |
| } |
| mWindowIds.push(id); |
| |
| mWindowTypes.put(windowId, windowType); |
| } |
| |
| /** |
| * Removes an entry if it exists. This method should be called when a window was just removed. |
| */ |
| void remove(int windowId) { |
| Integer id = windowId; |
| if (mWindowIds.contains(id)) { |
| // Call remove(Integer) to remove. |
| mWindowIds.remove(id); |
| mWindowTypes.remove(id); |
| AccessibilityNodeInfo node = mFocusedNodes.remove(id); |
| Utils.recycleNode(node); |
| } |
| } |
| |
| /** Gets the window type keyed by {@code windowId}, or null if none. */ |
| @Nullable |
| Integer getWindowType(int windowId) { |
| return mWindowTypes.get(windowId); |
| } |
| |
| /** |
| * Returns a copy of the most recently focused node in the most recently added window, or null |
| * if none. |
| */ |
| @Nullable |
| AccessibilityNodeInfo getMostRecentFocusedNode() { |
| if (mWindowIds.isEmpty()) { |
| return null; |
| } |
| Integer recentWindowId = mWindowIds.peek(); |
| if (recentWindowId == null) { |
| return null; |
| } |
| return copyNode(mFocusedNodes.get(recentWindowId)); |
| } |
| |
| /** Sets a mock NodeCopier instance for testing. */ |
| @VisibleForTesting |
| void setNodeCopier(@NonNull NodeCopier nodeCopier) { |
| mNodeCopier = nodeCopier; |
| } |
| |
| private AccessibilityNodeInfo copyNode(@Nullable AccessibilityNodeInfo node) { |
| return mNodeCopier.copy(node); |
| } |
| } |