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      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 import com.android.launcher3.config.FeatureFlags;
     32 
     33 @TargetApi(Build.VERSION_CODES.LOLLIPOP)
     34 public class OverviewScreenAccessibilityDelegate extends AccessibilityDelegate {
     35 
     36     private static final int MOVE_BACKWARD = R.id.action_move_screen_backwards;
     37     private static final int MOVE_FORWARD = R.id.action_move_screen_forwards;
     38 
     39     private final SparseArray<AccessibilityAction> mActions = new SparseArray<>();
     40     private final Workspace mWorkspace;
     41 
     42     public OverviewScreenAccessibilityDelegate(Workspace workspace) {
     43         mWorkspace = workspace;
     44 
     45         Context context = mWorkspace.getContext();
     46         boolean isRtl = Utilities.isRtl(context.getResources());
     47         mActions.put(MOVE_BACKWARD, new AccessibilityAction(MOVE_BACKWARD,
     48                 context.getText(isRtl ? R.string.action_move_screen_right :
     49                     R.string.action_move_screen_left)));
     50         mActions.put(MOVE_FORWARD, new AccessibilityAction(MOVE_FORWARD,
     51                 context.getText(isRtl ? R.string.action_move_screen_left :
     52                     R.string.action_move_screen_right)));
     53     }
     54 
     55     @Override
     56     public boolean performAccessibilityAction(View host, int action, Bundle args) {
     57         if (host != null) {
     58             if (action == AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS ) {
     59                 int index = mWorkspace.indexOfChild(host);
     60                 mWorkspace.setCurrentPage(index);
     61             } else if (action == MOVE_FORWARD) {
     62                 movePage(mWorkspace.indexOfChild(host) + 1, host);
     63                 return true;
     64             } else if (action == MOVE_BACKWARD) {
     65                 movePage(mWorkspace.indexOfChild(host) - 1, host);
     66                 return true;
     67             }
     68         }
     69 
     70         return super.performAccessibilityAction(host, action, args);
     71     }
     72 
     73     private void movePage(int finalIndex, View view) {
     74         mWorkspace.onStartReordering();
     75         mWorkspace.removeView(view);
     76         mWorkspace.addView(view, finalIndex);
     77         mWorkspace.onEndReordering();
     78         mWorkspace.announceForAccessibility(mWorkspace.getContext().getText(R.string.screen_moved));
     79 
     80         mWorkspace.updateAccessibilityFlags();
     81         view.performAccessibilityAction(AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS, null);
     82     }
     83 
     84     @Override
     85     public void onInitializeAccessibilityNodeInfo(View host, AccessibilityNodeInfo info) {
     86         super.onInitializeAccessibilityNodeInfo(host, info);
     87 
     88         int index = mWorkspace.indexOfChild(host);
     89         if (index < mWorkspace.getChildCount() - 1) {
     90             info.addAction(mActions.get(MOVE_FORWARD));
     91         }
     92 
     93         int startIndex = mWorkspace.numCustomPages() + (FeatureFlags.QSB_ON_FIRST_SCREEN ? 1 : 0);
     94         if (index > startIndex) {
     95             info.addAction(mActions.get(MOVE_BACKWARD));
     96         }
     97     }
     98 }
     99