1 /* 2 * Copyright (C) 2016 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.dragndrop; 18 19 import android.graphics.Point; 20 21 import com.android.launcher3.DropTarget; 22 23 /** 24 * Set of options to control the drag and drop behavior. 25 */ 26 public class DragOptions { 27 28 /** Whether or not an accessible drag operation is in progress. */ 29 public boolean isAccessibleDrag = false; 30 31 /** Specifies the start location for the system DnD, null when using internal DnD */ 32 public Point systemDndStartPoint = null; 33 34 /** Determines when a pre-drag should transition to a drag. By default, this is immediate. */ 35 public PreDragCondition preDragCondition = null; 36 37 /** Scale of the icons over the workspace icon size. */ 38 public float intrinsicIconScaleFactor = 1f; 39 40 public boolean isFlingToDelete; 41 42 /** 43 * Specifies a condition that must be met before DragListener#onDragStart() is called. 44 * By default, there is no condition and onDragStart() is called immediately following 45 * DragController#startDrag(). 46 * 47 * This condition can be overridden, and callbacks are provided for the following cases: 48 * - The pre-drag starts, but onDragStart() is deferred (onPreDragStart()). 49 * - The pre-drag ends before the condition is met (onPreDragEnd(false)). 50 * - The actual drag starts when the condition is met (onPreDragEnd(true)). 51 */ 52 public interface PreDragCondition { 53 shouldStartDrag(double distanceDragged)54 public boolean shouldStartDrag(double distanceDragged); 55 56 /** 57 * The pre-drag has started, but onDragStart() is 58 * deferred until shouldStartDrag() returns true. 59 */ onPreDragStart(DropTarget.DragObject dragObject)60 void onPreDragStart(DropTarget.DragObject dragObject); 61 62 /** 63 * The pre-drag has ended. This gets called at the same time as onDragStart() 64 * if the condition is met, otherwise at the same time as onDragEnd(). 65 * @param dragStarted Whether the pre-drag ended because the actual drag started. 66 * This will be true if the condition was met, otherwise false. 67 */ onPreDragEnd(DropTarget.DragObject dragObject, boolean dragStarted)68 void onPreDragEnd(DropTarget.DragObject dragObject, boolean dragStarted); 69 } 70 } 71