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      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 /**
     20  * Handles scrolling while dragging
     21  *
     22  */
     23 public interface DragScroller {
     24     void scrollLeft();
     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      */
     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      */
     39     boolean onExitScrollArea();
     40 }
     41