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/*
* Copyright (C) 2017 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.uioverrides;
import com.android.launcher3.Alarm;
import com.android.launcher3.OnAlarmListener;
/**
* Utility class to detect a pause during a drag.
*/
public class DragPauseDetector implements OnAlarmListener {
private static final float MAX_VELOCITY_TO_PAUSE = 0.2f;
private static final long PAUSE_DURATION = 100;
private final Alarm mAlarm;
private final Runnable mOnPauseCallback;
private boolean mTriggered = false;
private int mDisabledFlags = 0;
public DragPauseDetector(Runnable onPauseCallback) {
mOnPauseCallback = onPauseCallback;
mAlarm = new Alarm();
mAlarm.setOnAlarmListener(this);
mAlarm.setAlarm(PAUSE_DURATION);
}
public void onDrag(float velocity) {
if (mTriggered || !isEnabled()) {
return;
}
if (Math.abs(velocity) > MAX_VELOCITY_TO_PAUSE) {
// Cancel any previous alarm and set a new alarm
mAlarm.setAlarm(PAUSE_DURATION);
}
}
@Override
public void onAlarm(Alarm alarm) {
if (!mTriggered && isEnabled()) {
mTriggered = true;
mOnPauseCallback.run();
}
}
public boolean isTriggered () {
return mTriggered;
}
public boolean isEnabled() {
return mDisabledFlags == 0;
}
public void addDisabledFlags(int flags) {
boolean wasEnabled = isEnabled();
mDisabledFlags |= flags;
resetAlarm(wasEnabled);
}
public void clearDisabledFlags(int flags) {
boolean wasEnabled = isEnabled();
mDisabledFlags &= ~flags;
resetAlarm(wasEnabled);
}
private void resetAlarm(boolean wasEnabled) {
boolean isEnabled = isEnabled();
if (wasEnabled == isEnabled) {
// Nothing has changed
} if (isEnabled && !mTriggered) {
mAlarm.setAlarm(PAUSE_DURATION);
} else if (!isEnabled) {
mAlarm.cancelAlarm();
}
}
}
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