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
