1 /*
2  * Copyright (C) 2018 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.touch;
17 
18 import static android.view.View.INVISIBLE;
19 import static android.view.View.VISIBLE;
20 
21 import static com.android.launcher3.LauncherState.ALL_APPS;
22 import static com.android.launcher3.LauncherState.NORMAL;
23 import static com.android.launcher3.LauncherState.OVERVIEW;
24 
25 import android.view.View;
26 import android.view.View.OnLongClickListener;
27 
28 import com.android.launcher3.CellLayout;
29 import com.android.launcher3.DeviceProfile;
30 import com.android.launcher3.DropTarget;
31 import com.android.launcher3.Launcher;
32 import com.android.launcher3.dragndrop.DragController;
33 import com.android.launcher3.dragndrop.DragOptions;
34 import com.android.launcher3.folder.Folder;
35 import com.android.launcher3.model.data.ItemInfo;
36 import com.android.launcher3.testing.TestLogging;
37 import com.android.launcher3.testing.TestProtocol;
38 
39 /**
40  * Class to handle long-clicks on workspace items and start drag as a result.
41  */
42 public class ItemLongClickListener {
43 
44     public static final OnLongClickListener INSTANCE_WORKSPACE =
45             ItemLongClickListener::onWorkspaceItemLongClick;
46 
47     public static final OnLongClickListener INSTANCE_ALL_APPS =
48             ItemLongClickListener::onAllAppsItemLongClick;
49 
onWorkspaceItemLongClick(View v)50     private static boolean onWorkspaceItemLongClick(View v) {
51         TestLogging.recordEvent(TestProtocol.SEQUENCE_MAIN, "onWorkspaceItemLongClick");
52         Launcher launcher = Launcher.getLauncher(v.getContext());
53         if (!canStartDrag(launcher)) return false;
54         if (!launcher.isInState(NORMAL) && !launcher.isInState(OVERVIEW)) return false;
55         if (!(v.getTag() instanceof ItemInfo)) return false;
56 
57         launcher.setWaitingForResult(null);
58         beginDrag(v, launcher, (ItemInfo) v.getTag(), new DragOptions());
59         return true;
60     }
61 
beginDrag(View v, Launcher launcher, ItemInfo info, DragOptions dragOptions)62     public static void beginDrag(View v, Launcher launcher, ItemInfo info,
63             DragOptions dragOptions) {
64         if (info.container >= 0) {
65             Folder folder = Folder.getOpen(launcher);
66             if (folder != null) {
67                 if (!folder.getIconsInReadingOrder().contains(v)) {
68                     folder.close(true);
69                 } else {
70                     folder.startDrag(v, dragOptions);
71                     return;
72                 }
73             }
74         }
75 
76         CellLayout.CellInfo longClickCellInfo = new CellLayout.CellInfo(v, info);
77         launcher.getWorkspace().startDrag(longClickCellInfo, dragOptions);
78     }
79 
onAllAppsItemLongClick(View v)80     private static boolean onAllAppsItemLongClick(View v) {
81         TestLogging.recordEvent(TestProtocol.SEQUENCE_MAIN, "onAllAppsItemLongClick");
82         v.cancelLongPress();
83         Launcher launcher = Launcher.getLauncher(v.getContext());
84         if (!canStartDrag(launcher)) return false;
85         // When we have exited all apps or are in transition, disregard long clicks
86         if (!launcher.isInState(ALL_APPS) && !launcher.isInState(OVERVIEW)) return false;
87         if (launcher.getWorkspace().isSwitchingState()) return false;
88 
89         // Start the drag
90         final DragController dragController = launcher.getDragController();
91         dragController.addDragListener(new DragController.DragListener() {
92             @Override
93             public void onDragStart(DropTarget.DragObject dragObject, DragOptions options) {
94                 v.setVisibility(INVISIBLE);
95             }
96 
97             @Override
98             public void onDragEnd() {
99                 v.setVisibility(VISIBLE);
100                 dragController.removeDragListener(this);
101             }
102         });
103 
104         DeviceProfile grid = launcher.getDeviceProfile();
105         DragOptions options = new DragOptions();
106         options.intrinsicIconScaleFactor = (float) grid.allAppsIconSizePx / grid.iconSizePx;
107         launcher.getWorkspace().beginDragShared(v, launcher.getAppsView(), options);
108         return false;
109     }
110 
canStartDrag(Launcher launcher)111     public static boolean canStartDrag(Launcher launcher) {
112         if (launcher == null) {
113             return false;
114         }
115         // We prevent dragging when we are loading the workspace as it is possible to pick up a view
116         // that is subsequently removed from the workspace in startBinding().
117         if (launcher.isWorkspaceLocked()) return false;
118         // Return early if an item is already being dragged (e.g. when long-pressing two shortcuts)
119         if (launcher.getDragController().isDragging()) return false;
120 
121         return true;
122     }
123 }
124