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.launcher2;
18 
19 /**
20  * Handles scrolling while dragging
21  *
22  */
23 public interface DragScroller {
scrollLeft()24     void scrollLeft();
scrollRight()25     void scrollRight();
26 
27     /**
28      * The touch point has entered the scroll area; a scroll is imminent.
29      * This event will only occur while a drag is active.
30      *
31      * @param direction The scroll direction
32      */
onEnterScrollArea(int x, int y, int direction)33     boolean onEnterScrollArea(int x, int y, int direction);
34 
35     /**
36      * The touch point has left the scroll area.
37      * NOTE: This may not be called, if a drop occurs inside the scroll area.
38      */
onExitScrollArea()39     boolean onExitScrollArea();
40 }
41