/*
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* Copyright (C) 2015 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.launcher3.accessibility;
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import static com.android.launcher3.compat.AccessibilityManagerCompat.isAccessibilityEnabled;
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import android.view.View;
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import android.view.accessibility.AccessibilityEvent;
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import com.android.launcher3.Launcher;
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/**
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* Periodically sends accessibility events to announce ongoing state changed. Based on the
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* implementation in ProgressBar.
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*/
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public class DragViewStateAnnouncer implements Runnable {
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private static final int TIMEOUT_SEND_ACCESSIBILITY_EVENT = 200;
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private final View mTargetView;
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private DragViewStateAnnouncer(View view) {
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mTargetView = view;
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}
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public void announce(CharSequence msg) {
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mTargetView.setContentDescription(msg);
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mTargetView.removeCallbacks(this);
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mTargetView.postDelayed(this, TIMEOUT_SEND_ACCESSIBILITY_EVENT);
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}
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public void cancel() {
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mTargetView.removeCallbacks(this);
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}
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@Override
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public void run() {
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mTargetView.sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_SELECTED);
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}
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public void completeAction(int announceResId) {
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cancel();
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Launcher launcher = Launcher.getLauncher(mTargetView.getContext());
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launcher.getDragLayer().announceForAccessibility(launcher.getText(announceResId));
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}
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public static DragViewStateAnnouncer createFor(View v) {
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return isAccessibilityEnabled(v.getContext()) ? new DragViewStateAnnouncer(v) : null;
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}
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}
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