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/*
* 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.launcher3.accessibility;
import android.content.Context;
import android.view.View;
import android.view.accessibility.AccessibilityEvent;
import android.view.accessibility.AccessibilityManager;
/**
* Periodically sends accessibility events to announce ongoing state changed. Based on the
* implementation in ProgressBar.
*/
public class DragViewStateAnnouncer implements Runnable {
private static final int TIMEOUT_SEND_ACCESSIBILITY_EVENT = 200;
private final View mTargetView;
private DragViewStateAnnouncer(View view) {
mTargetView = view;
}
public void announce(CharSequence msg) {
mTargetView.setContentDescription(msg);
mTargetView.removeCallbacks(this);
mTargetView.postDelayed(this, TIMEOUT_SEND_ACCESSIBILITY_EVENT);
}
public void cancel() {
mTargetView.removeCallbacks(this);
}
@Override
public void run() {
mTargetView.sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_SELECTED);
}
public static DragViewStateAnnouncer createFor(View v) {
if (((AccessibilityManager) v.getContext().getSystemService(Context.ACCESSIBILITY_SERVICE))
.isEnabled()) {
return new DragViewStateAnnouncer(v);
} else {
return null;
}
}
}
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