1 /*
2  * Copyright (C) 2011 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 
17 package com.android.launcher3;
18 
19 import static com.android.launcher3.logging.StatsLogManager.LauncherEvent.LAUNCHER_ITEM_DROPPED_ON_CANCEL;
20 import static com.android.launcher3.logging.StatsLogManager.LauncherEvent.LAUNCHER_ITEM_DROPPED_ON_REMOVE;
21 
22 import android.content.Context;
23 import android.text.TextUtils;
24 import android.util.AttributeSet;
25 import android.view.View;
26 
27 import com.android.launcher3.accessibility.LauncherAccessibilityDelegate;
28 import com.android.launcher3.dragndrop.DragOptions;
29 import com.android.launcher3.logging.StatsLogManager;
30 import com.android.launcher3.model.data.CollectionInfo;
31 import com.android.launcher3.model.data.ItemInfo;
32 import com.android.launcher3.model.data.LauncherAppWidgetInfo;
33 import com.android.launcher3.model.data.WorkspaceItemInfo;
34 
35 public class DeleteDropTarget extends ButtonDropTarget {
36 
37     private final StatsLogManager mStatsLogManager;
38 
39     private StatsLogManager.LauncherEvent mLauncherEvent;
40 
DeleteDropTarget(Context context)41     public DeleteDropTarget(Context context) {
42         this(context, null, 0);
43     }
44 
DeleteDropTarget(Context context, AttributeSet attrs)45     public DeleteDropTarget(Context context, AttributeSet attrs) {
46         this(context, attrs, 0);
47     }
48 
DeleteDropTarget(Context context, AttributeSet attrs, int defStyle)49     public DeleteDropTarget(Context context, AttributeSet attrs, int defStyle) {
50         super(context, attrs, defStyle);
51         this.mStatsLogManager = StatsLogManager.newInstance(context);
52     }
53 
54     @Override
onFinishInflate()55     protected void onFinishInflate() {
56         super.onFinishInflate();
57         setDrawable(R.drawable.ic_remove_no_shadow);
58     }
59 
60     @Override
onDragStart(DropTarget.DragObject dragObject, DragOptions options)61     public void onDragStart(DropTarget.DragObject dragObject, DragOptions options) {
62         super.onDragStart(dragObject, options);
63         setTextBasedOnDragSource(dragObject.dragInfo);
64         setControlTypeBasedOnDragSource(dragObject.dragInfo);
65     }
66 
67     /**
68      * @return true for items that should have a "Remove" action in accessibility.
69      */
70     @Override
supportsAccessibilityDrop(ItemInfo info, View view)71     public boolean supportsAccessibilityDrop(ItemInfo info, View view) {
72         if (info instanceof WorkspaceItemInfo) {
73             // Support the action unless the item is in a context menu.
74             return canRemove(info);
75         }
76 
77         return (info instanceof LauncherAppWidgetInfo)
78                 || (info instanceof CollectionInfo);
79     }
80 
81     @Override
getAccessibilityAction()82     public int getAccessibilityAction() {
83         return LauncherAccessibilityDelegate.REMOVE;
84     }
85 
86     @Override
setupItemInfo(ItemInfo info)87     protected void setupItemInfo(ItemInfo info) {}
88 
89     @Override
supportsDrop(ItemInfo info)90     protected boolean supportsDrop(ItemInfo info) {
91         return true;
92     }
93 
94     /**
95      * Set the drop target's text to either "Remove" or "Cancel" depending on the drag item.
96      */
setTextBasedOnDragSource(ItemInfo item)97     private void setTextBasedOnDragSource(ItemInfo item) {
98         if (!TextUtils.isEmpty(mText)) {
99             mText = getResources().getString(canRemove(item)
100                     ? R.string.remove_drop_target_label
101                     : android.R.string.cancel);
102             setContentDescription(mText);
103             requestLayout();
104         }
105     }
106 
canRemove(ItemInfo item)107     private boolean canRemove(ItemInfo item) {
108         return item.id != ItemInfo.NO_ID;
109     }
110 
111     /**
112      * Set mControlType depending on the drag item.
113      */
setControlTypeBasedOnDragSource(ItemInfo item)114     private void setControlTypeBasedOnDragSource(ItemInfo item) {
115         mLauncherEvent = item.id != ItemInfo.NO_ID ? LAUNCHER_ITEM_DROPPED_ON_REMOVE
116                 : LAUNCHER_ITEM_DROPPED_ON_CANCEL;
117     }
118 
119     @Override
onDrop(DragObject d, DragOptions options)120     public void onDrop(DragObject d, DragOptions options) {
121         if (canRemove(d.dragInfo)) {
122             mDropTargetHandler.prepareToUndoDelete();
123         }
124         super.onDrop(d, options);
125         mStatsLogManager.logger().withInstanceId(d.logInstanceId)
126                 .log(mLauncherEvent);
127     }
128 
129     @Override
completeDrop(DragObject d)130     public void completeDrop(DragObject d) {
131         ItemInfo item = d.dragInfo;
132         if (canRemove(item)) {
133             onAccessibilityDrop(null, item);
134             mDropTargetHandler.onDeleteComplete(item);
135         }
136     }
137 
138     /**
139      * Removes the item from the workspace. If the view is not null, it also removes the view.
140      */
141     @Override
onAccessibilityDrop(View view, ItemInfo item)142     public void onAccessibilityDrop(View view, ItemInfo item) {
143         // Remove the item from launcher and the db, we can ignore the containerInfo in this call
144         // because we already remove the drag view from the folder (if the drag originated from
145         // a folder) in Folder.beginDrag()
146         CharSequence announcement = getContext().getString(R.string.item_removed);
147         mDropTargetHandler.onAccessibilityDelete(view, item, announcement);
148     }
149 }
150