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