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/*
* Copyright (C) 2010 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;
public class SpringLoadedDragController implements OnAlarmListener {
// how long the user must hover over a mini-screen before it unshrinks
final long ENTER_SPRING_LOAD_HOVER_TIME = 500;
final long ENTER_SPRING_LOAD_CANCEL_HOVER_TIME = 950;
final long EXIT_SPRING_LOAD_HOVER_TIME = 200;
Alarm mAlarm;
// the screen the user is currently hovering over, if any
private CellLayout mScreen;
private Launcher mLauncher;
public SpringLoadedDragController(Launcher launcher) {
mLauncher = launcher;
mAlarm = new Alarm();
mAlarm.setOnAlarmListener(this);
}
public void cancel() {
mAlarm.cancelAlarm();
}
// Set a new alarm to expire for the screen that we are hovering over now
public void setAlarm(CellLayout cl) {
mAlarm.cancelAlarm();
mAlarm.setAlarm((cl == null) ? ENTER_SPRING_LOAD_CANCEL_HOVER_TIME :
ENTER_SPRING_LOAD_HOVER_TIME);
mScreen = cl;
}
// this is called when our timer runs out
public void onAlarm(Alarm alarm) {
if (mScreen != null) {
// Snap to the screen that we are hovering over now
Workspace w = mLauncher.getWorkspace();
int page = w.indexOfChild(mScreen);
if (page != w.getCurrentPage()) {
w.snapToPage(page);
}
} else {
mLauncher.getDragController().cancelDrag();
}
}
}
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