1 /* 2 * Copyright (C) 2010 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 package com.android.launcher3.dragndrop 17 18 import com.android.launcher3.Alarm 19 import com.android.launcher3.CellLayout 20 import com.android.launcher3.Launcher 21 import com.android.launcher3.OnAlarmListener 22 import com.android.launcher3.Utilities 23 24 class SpringLoadedDragController(private val launcher: Launcher) : OnAlarmListener { <lambda>null25 internal val alarm = Alarm().also { it.setOnAlarmListener(this) } 26 27 // the screen the user is currently hovering over, if any 28 private var screen: CellLayout? = null 29 cancelnull30 fun cancel() = alarm.cancelAlarm() 31 32 // Set a new alarm to expire for the screen that we are hovering over now 33 fun setAlarm(cl: CellLayout?) { 34 cancel() 35 alarm.setAlarm( 36 when { 37 cl == null -> ENTER_SPRING_LOAD_CANCEL_HOVER_TIME 38 // Some TAPL tests are flaky on Cuttlefish with a low waiting time 39 Utilities.isRunningInTestHarness() -> ENTER_SPRING_LOAD_HOVER_TIME_IN_TEST 40 else -> ENTER_SPRING_LOAD_HOVER_TIME 41 } 42 ) 43 screen = cl 44 } 45 46 // this is called when our timer runs out onAlarmnull47 override fun onAlarm(alarm: Alarm) { 48 if (screen != null) { 49 // Snap to the screen that we are hovering over now 50 with(launcher.workspace) { 51 if (!isVisible(screen) && launcher.dragController.mDistanceSinceScroll != 0) { 52 snapToPage(indexOfChild(screen)) 53 } 54 } 55 } else { 56 launcher.dragController.cancelDrag() 57 } 58 } 59 60 companion object { 61 // how long the user must hover over a mini-screen before it unshrinks 62 private const val ENTER_SPRING_LOAD_HOVER_TIME: Long = 500 63 private const val ENTER_SPRING_LOAD_HOVER_TIME_IN_TEST: Long = 3000 64 private const val ENTER_SPRING_LOAD_CANCEL_HOVER_TIME: Long = 950 65 } 66 } 67