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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.messaging.ui.mediapicker;
import android.content.Context;
import android.os.SystemClock;
import android.util.AttributeSet;
import android.widget.Chronometer;
import com.android.messaging.ui.PlaybackStateView;
/**
* A pausable Chronometer implementation. The default Chronometer in Android only stops the UI
* from updating when you call stop(), but doesn't actually pause it. This implementation adds an
* additional timestamp that tracks the timespan for the pause and compensate for that.
*/
public class PausableChronometer extends Chronometer implements PlaybackStateView {
// Keeps track of how far long the Chronometer has been tracking when it's paused. We'd like
// to start from this time the next time it's resumed.
private long mTimeWhenPaused = 0;
public PausableChronometer(final Context context, final AttributeSet attrs) {
super(context, attrs);
}
/**
* Reset the timer and start counting from zero.
*/
@Override
public void restart() {
reset();
start();
}
/**
* Reset the timer to zero, but don't start it.
*/
@Override
public void reset() {
stop();
setBase(SystemClock.elapsedRealtime());
mTimeWhenPaused = 0;
}
/**
* Resume the timer after a previous pause.
*/
@Override
public void resume() {
setBase(SystemClock.elapsedRealtime() - mTimeWhenPaused);
start();
}
/**
* Pause the timer.
*/
@Override
public void pause() {
stop();
mTimeWhenPaused = SystemClock.elapsedRealtime() - getBase();
}
}
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