/* * 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(); } } }