RecentsViewTouchHandler.java revision df42455b1c1c1e0aafc090a0b89c088cbc603551
1/* 2 * Copyright (C) 2014 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 17package com.android.systemui.recents.views; 18 19import android.app.ActivityManager; 20import android.content.res.Configuration; 21import android.graphics.Point; 22import android.graphics.Rect; 23import android.view.InputDevice; 24import android.view.MotionEvent; 25import android.view.PointerIcon; 26import android.view.ViewConfiguration; 27import android.view.ViewDebug; 28 29import com.android.internal.policy.DividerSnapAlgorithm; 30import com.android.systemui.recents.Recents; 31import com.android.systemui.recents.events.EventBus; 32import com.android.systemui.recents.events.activity.ConfigurationChangedEvent; 33import com.android.systemui.recents.events.activity.HideRecentsEvent; 34import com.android.systemui.recents.events.ui.HideIncompatibleAppOverlayEvent; 35import com.android.systemui.recents.events.ui.ShowIncompatibleAppOverlayEvent; 36import com.android.systemui.recents.events.ui.dragndrop.DragDropTargetChangedEvent; 37import com.android.systemui.recents.events.ui.dragndrop.DragEndEvent; 38import com.android.systemui.recents.events.ui.dragndrop.DragStartEvent; 39import com.android.systemui.recents.events.ui.dragndrop.DragStartInitializeDropTargetsEvent; 40import com.android.systemui.recents.misc.SystemServicesProxy; 41import com.android.systemui.recents.model.Task; 42import com.android.systemui.recents.model.TaskStack; 43 44import java.util.ArrayList; 45 46/** 47 * Handles touch events for a RecentsView. 48 */ 49public class RecentsViewTouchHandler { 50 51 private RecentsView mRv; 52 53 @ViewDebug.ExportedProperty(deepExport=true, prefix="drag_task") 54 private Task mDragTask; 55 @ViewDebug.ExportedProperty(deepExport=true, prefix="drag_task_view_") 56 private TaskView mTaskView; 57 58 @ViewDebug.ExportedProperty(category="recents") 59 private Point mTaskViewOffset = new Point(); 60 @ViewDebug.ExportedProperty(category="recents") 61 private Point mDownPos = new Point(); 62 @ViewDebug.ExportedProperty(category="recents") 63 private boolean mDragRequested; 64 @ViewDebug.ExportedProperty(category="recents") 65 private boolean mIsDragging; 66 private float mDragSlop; 67 private int mDeviceId = -1; 68 69 private DropTarget mLastDropTarget; 70 private DividerSnapAlgorithm mDividerSnapAlgorithm; 71 private ArrayList<DropTarget> mDropTargets = new ArrayList<>(); 72 private ArrayList<TaskStack.DockState> mVisibleDockStates = new ArrayList<>(); 73 74 public RecentsViewTouchHandler(RecentsView rv) { 75 mRv = rv; 76 mDragSlop = ViewConfiguration.get(rv.getContext()).getScaledTouchSlop(); 77 updateSnapAlgorithm(); 78 } 79 80 private void updateSnapAlgorithm() { 81 Rect insets = new Rect(); 82 SystemServicesProxy.getInstance(mRv.getContext()).getStableInsets(insets); 83 mDividerSnapAlgorithm = DividerSnapAlgorithm.create(mRv.getContext(), insets); 84 } 85 86 /** 87 * Registers a new drop target for the current drag only. 88 */ 89 public void registerDropTargetForCurrentDrag(DropTarget target) { 90 mDropTargets.add(target); 91 } 92 93 /** 94 * Returns the set of visible dock states for this current drag. 95 */ 96 public ArrayList<TaskStack.DockState> getVisibleDockStates() { 97 return mVisibleDockStates; 98 } 99 100 /** Touch preprocessing for handling below */ 101 public boolean onInterceptTouchEvent(MotionEvent ev) { 102 handleTouchEvent(ev); 103 return mDragRequested; 104 } 105 106 /** Handles touch events once we have intercepted them */ 107 public boolean onTouchEvent(MotionEvent ev) { 108 handleTouchEvent(ev); 109 if (ev.getAction() == MotionEvent.ACTION_UP && mRv.getStack().getStackTaskCount() == 0) { 110 EventBus.getDefault().send(new HideRecentsEvent(false, true)); 111 } 112 return true; 113 } 114 115 /**** Events ****/ 116 117 public final void onBusEvent(DragStartEvent event) { 118 SystemServicesProxy ssp = Recents.getSystemServices(); 119 mRv.getParent().requestDisallowInterceptTouchEvent(true); 120 mDragRequested = true; 121 // We defer starting the actual drag handling until the user moves past the drag slop 122 mIsDragging = false; 123 mDragTask = event.task; 124 mTaskView = event.taskView; 125 mDropTargets.clear(); 126 127 int[] recentsViewLocation = new int[2]; 128 mRv.getLocationInWindow(recentsViewLocation); 129 mTaskViewOffset.set(mTaskView.getLeft() - recentsViewLocation[0] + event.tlOffset.x, 130 mTaskView.getTop() - recentsViewLocation[1] + event.tlOffset.y); 131 132 // Change space coordinates relative to the view to RecentsView when user initiates a touch 133 if (event.isUserTouchInitiated) { 134 float x = mDownPos.x - mTaskViewOffset.x; 135 float y = mDownPos.y - mTaskViewOffset.y; 136 mTaskView.setTranslationX(x); 137 mTaskView.setTranslationY(y); 138 } 139 140 mVisibleDockStates.clear(); 141 if (ActivityManager.supportsMultiWindow() && !ssp.hasDockedTask() 142 && mDividerSnapAlgorithm.isSplitScreenFeasible()) { 143 Recents.logDockAttempt(mRv.getContext(), event.task.getTopComponent(), 144 event.task.resizeMode); 145 if (!event.task.isDockable) { 146 EventBus.getDefault().send(new ShowIncompatibleAppOverlayEvent()); 147 } else { 148 // Add the dock state drop targets (these take priority) 149 TaskStack.DockState[] dockStates = Recents.getConfiguration() 150 .getDockStatesForCurrentOrientation(); 151 for (TaskStack.DockState dockState : dockStates) { 152 registerDropTargetForCurrentDrag(dockState); 153 dockState.update(mRv.getContext()); 154 mVisibleDockStates.add(dockState); 155 } 156 } 157 } 158 159 // Request other drop targets to register themselves 160 EventBus.getDefault().send(new DragStartInitializeDropTargetsEvent(event.task, 161 event.taskView, this)); 162 if (mDeviceId != -1) { 163 InputDevice device = InputDevice.getDevice(mDeviceId); 164 if (device != null) { 165 device.setPointerType(PointerIcon.TYPE_GRABBING); 166 } 167 } 168 } 169 170 public final void onBusEvent(DragEndEvent event) { 171 if (!mDragTask.isDockable) { 172 EventBus.getDefault().send(new HideIncompatibleAppOverlayEvent()); 173 } 174 mDragRequested = false; 175 mDragTask = null; 176 mTaskView = null; 177 mLastDropTarget = null; 178 } 179 180 public final void onBusEvent(ConfigurationChangedEvent event) { 181 if (event.fromDisplayDensityChange || event.fromDeviceOrientationChange) { 182 updateSnapAlgorithm(); 183 } 184 } 185 186 /** 187 * Handles dragging touch events 188 */ 189 private void handleTouchEvent(MotionEvent ev) { 190 int action = ev.getActionMasked(); 191 switch (action) { 192 case MotionEvent.ACTION_DOWN: 193 mDownPos.set((int) ev.getX(), (int) ev.getY()); 194 mDeviceId = ev.getDeviceId(); 195 break; 196 case MotionEvent.ACTION_MOVE: { 197 float evX = ev.getX(); 198 float evY = ev.getY(); 199 float x = evX - mTaskViewOffset.x; 200 float y = evY - mTaskViewOffset.y; 201 202 if (mDragRequested) { 203 if (!mIsDragging) { 204 mIsDragging = Math.hypot(evX - mDownPos.x, evY - mDownPos.y) > mDragSlop; 205 } 206 if (mIsDragging) { 207 int width = mRv.getMeasuredWidth(); 208 int height = mRv.getMeasuredHeight(); 209 210 DropTarget currentDropTarget = null; 211 212 // Give priority to the current drop target to retain the touch handling 213 if (mLastDropTarget != null) { 214 if (mLastDropTarget.acceptsDrop((int) evX, (int) evY, width, height, 215 mRv.mSystemInsets, true /* isCurrentTarget */)) { 216 currentDropTarget = mLastDropTarget; 217 } 218 } 219 220 // Otherwise, find the next target to handle this event 221 if (currentDropTarget == null) { 222 for (DropTarget target : mDropTargets) { 223 if (target.acceptsDrop((int) evX, (int) evY, width, height, 224 mRv.mSystemInsets, false /* isCurrentTarget */)) { 225 currentDropTarget = target; 226 break; 227 } 228 } 229 } 230 if (mLastDropTarget != currentDropTarget) { 231 mLastDropTarget = currentDropTarget; 232 EventBus.getDefault().send(new DragDropTargetChangedEvent(mDragTask, 233 currentDropTarget)); 234 } 235 236 } 237 238 mTaskView.setTranslationX(x); 239 mTaskView.setTranslationY(y); 240 } 241 break; 242 } 243 case MotionEvent.ACTION_UP: 244 case MotionEvent.ACTION_CANCEL: { 245 if (mDragRequested) { 246 boolean cancelled = action == MotionEvent.ACTION_CANCEL; 247 if (cancelled) { 248 EventBus.getDefault().send(new DragDropTargetChangedEvent(mDragTask, null)); 249 } 250 EventBus.getDefault().send(new DragEndEvent(mDragTask, mTaskView, 251 !cancelled ? mLastDropTarget : null)); 252 break; 253 } 254 mDeviceId = -1; 255 } 256 } 257 } 258} 259