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 com.android.launcher3.accessibility; 18 19 import android.annotation.TargetApi; 20 import android.content.Context; 21 import android.os.Build; 22 import android.os.Bundle; 23 import android.util.SparseArray; 24 import android.view.View; 25 import android.view.View.AccessibilityDelegate; 26 import android.view.accessibility.AccessibilityNodeInfo; 27 import android.view.accessibility.AccessibilityNodeInfo.AccessibilityAction; 28 import com.android.launcher3.R; 29 import com.android.launcher3.Utilities; 30 import com.android.launcher3.Workspace; 31 32 @TargetApi(Build.VERSION_CODES.LOLLIPOP) 33 public class OverviewScreenAccessibilityDelegate extends AccessibilityDelegate { 34 35 private static final int MOVE_BACKWARD = R.id.action_move_screen_backwards; 36 private static final int MOVE_FORWARD = R.id.action_move_screen_forwards; 37 38 private final SparseArray<AccessibilityAction> mActions = new SparseArray<>(); 39 private final Workspace mWorkspace; 40 OverviewScreenAccessibilityDelegate(Workspace workspace)41 public OverviewScreenAccessibilityDelegate(Workspace workspace) { 42 mWorkspace = workspace; 43 44 Context context = mWorkspace.getContext(); 45 boolean isRtl = Utilities.isRtl(context.getResources()); 46 mActions.put(MOVE_BACKWARD, new AccessibilityAction(MOVE_BACKWARD, 47 context.getText(isRtl ? R.string.action_move_screen_right : 48 R.string.action_move_screen_left))); 49 mActions.put(MOVE_FORWARD, new AccessibilityAction(MOVE_FORWARD, 50 context.getText(isRtl ? R.string.action_move_screen_left : 51 R.string.action_move_screen_right))); 52 } 53 54 @Override performAccessibilityAction(View host, int action, Bundle args)55 public boolean performAccessibilityAction(View host, int action, Bundle args) { 56 if (host != null) { 57 if (action == AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS ) { 58 int index = mWorkspace.indexOfChild(host); 59 mWorkspace.setCurrentPage(index); 60 } else if (action == MOVE_FORWARD) { 61 movePage(mWorkspace.indexOfChild(host) + 1, host); 62 return true; 63 } else if (action == MOVE_BACKWARD) { 64 movePage(mWorkspace.indexOfChild(host) - 1, host); 65 return true; 66 } 67 } 68 69 return super.performAccessibilityAction(host, action, args); 70 } 71 movePage(int finalIndex, View view)72 private void movePage(int finalIndex, View view) { 73 mWorkspace.onStartReordering(); 74 mWorkspace.removeView(view); 75 mWorkspace.addView(view, finalIndex); 76 mWorkspace.onEndReordering(); 77 mWorkspace.announceForAccessibility(mWorkspace.getContext().getText(R.string.screen_moved)); 78 79 mWorkspace.updateAccessibilityFlags(); 80 view.performAccessibilityAction(AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS, null); 81 } 82 83 @Override onInitializeAccessibilityNodeInfo(View host, AccessibilityNodeInfo info)84 public void onInitializeAccessibilityNodeInfo(View host, AccessibilityNodeInfo info) { 85 super.onInitializeAccessibilityNodeInfo(host, info); 86 87 int index = mWorkspace.indexOfChild(host); 88 if (index < mWorkspace.getChildCount() - 1) { 89 info.addAction(mActions.get(MOVE_FORWARD)); 90 } 91 if (index > mWorkspace.numCustomPages()) { 92 info.addAction(mActions.get(MOVE_BACKWARD)); 93 } 94 } 95 } 96