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/*
* Copyright (C) 2016 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.launcher3.dragndrop;
import android.graphics.Point;
import com.android.launcher3.DropTarget;
/**
* Set of options to control the drag and drop behavior.
*/
public class DragOptions {
/** Whether or not an accessible drag operation is in progress. */
public boolean isAccessibleDrag = false;
/** Specifies the start location for the system DnD, null when using internal DnD */
public Point systemDndStartPoint = null;
/** Determines when a pre-drag should transition to a drag. By default, this is immediate. */
public PreDragCondition preDragCondition = null;
/**
* Specifies a condition that must be met before DragListener#onDragStart() is called.
* By default, there is no condition and onDragStart() is called immediately following
* DragController#startDrag().
*
* This condition can be overridden, and callbacks are provided for the following cases:
* - The pre-drag starts, but onDragStart() is deferred (onPreDragStart()).
* - The pre-drag ends before the condition is met (onPreDragEnd(false)).
* - The actual drag starts when the condition is met (onPreDragEnd(true)).
*/
public interface PreDragCondition {
public boolean shouldStartDrag(double distanceDragged);
/**
* The pre-drag has started, but onDragStart() is
* deferred until shouldStartDrag() returns true.
*/
void onPreDragStart(DropTarget.DragObject dragObject);
/**
* The pre-drag has ended. This gets called at the same time as onDragStart()
* if the condition is met, otherwise at the same time as onDragEnd().
* @param dragStarted Whether the pre-drag ended because the actual drag started.
* This will be true if the condition was met, otherwise false.
*/
void onPreDragEnd(DropTarget.DragObject dragObject, boolean dragStarted);
}
}
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