1 /*
2  * Copyright (C) 2008 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 android.view.View;
20 
21 import com.android.launcher3.DropTarget.DragObject;
22 
23 /**
24  * Interface defining an object that can originate a drag.
25  *
26  */
27 public interface DragSource {
28     /**
29      * @return whether items dragged from this source supports
30      */
supportsFlingToDelete()31     boolean supportsFlingToDelete();
32 
33     /**
34      * @return whether items dragged from this source supports 'App Info'
35      */
supportsAppInfoDropTarget()36     boolean supportsAppInfoDropTarget();
37 
38     /**
39      * @return whether items dragged from this source supports 'Delete' drop target (e.g. to remove
40      * a shortcut.
41      */
supportsDeleteDropTarget()42     boolean supportsDeleteDropTarget();
43 
44     /*
45      * @return the scale of the icons over the workspace icon size
46      */
getIntrinsicIconScaleFactor()47     float getIntrinsicIconScaleFactor();
48 
49     /**
50      * A callback specifically made back to the source after an item from this source has been flung
51      * to be deleted on a DropTarget.  In such a situation, this method will be called after
52      * onDropCompleted, and more importantly, after the fling animation has completed.
53      */
onFlingToDeleteCompleted()54     void onFlingToDeleteCompleted();
55 
56     /**
57      * A callback made back to the source after an item from this source has been dropped on a
58      * DropTarget.
59      */
onDropCompleted(View target, DragObject d, boolean isFlingToDelete, boolean success)60     void onDropCompleted(View target, DragObject d, boolean isFlingToDelete, boolean success);
61 }
62