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.content.Context; 20 import android.view.View; 21 import android.view.accessibility.AccessibilityEvent; 22 import android.view.accessibility.AccessibilityManager; 23 24 /** 25 * Periodically sends accessibility events to announce ongoing state changed. Based on the 26 * implementation in ProgressBar. 27 */ 28 public class DragViewStateAnnouncer implements Runnable { 29 30 private static final int TIMEOUT_SEND_ACCESSIBILITY_EVENT = 200; 31 32 private final View mTargetView; 33 34 private DragViewStateAnnouncer(View view) { 35 mTargetView = view; 36 } 37 38 public void announce(CharSequence msg) { 39 mTargetView.setContentDescription(msg); 40 mTargetView.removeCallbacks(this); 41 mTargetView.postDelayed(this, TIMEOUT_SEND_ACCESSIBILITY_EVENT); 42 } 43 44 public void cancel() { 45 mTargetView.removeCallbacks(this); 46 } 47 48 @Override 49 public void run() { 50 mTargetView.sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_SELECTED); 51 } 52 53 public static DragViewStateAnnouncer createFor(View v) { 54 if (((AccessibilityManager) v.getContext().getSystemService(Context.ACCESSIBILITY_SERVICE)) 55 .isEnabled()) { 56 return new DragViewStateAnnouncer(v); 57 } else { 58 return null; 59 } 60 } 61 } 62
