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/*
* Copyright (C) 2008 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.launcher;
import android.view.View;
/**
* Interface for initiating a drag within a view or across multiple views.
*
*/
public interface DragController {
/**
* Interface to receive notifications when a drag starts or stops
*/
interface DragListener {
/**
* A drag has begun
*
* @param v The view that is being dragged
* @param source An object representing where the drag originated
* @param info The data associated with the object that is being dragged
* @param dragAction The drag action: either {@link DragController#DRAG_ACTION_MOVE}
* or {@link DragController#DRAG_ACTION_COPY}
*/
void onDragStart(View v, DragSource source, Object info, int dragAction);
/**
* The drag has eneded
*/
void onDragEnd();
}
/**
* Indicates the drag is a move.
*/
public static int DRAG_ACTION_MOVE = 0;
/**
* Indicates the drag is a copy.
*/
public static int DRAG_ACTION_COPY = 1;
/**
* Starts a drag
*
* @param v The view that is being dragged
* @param source An object representing where the drag originated
* @param info The data associated with the object that is being dragged
* @param dragAction The drag action: either {@link #DRAG_ACTION_MOVE} or
* {@link #DRAG_ACTION_COPY}
*/
void startDrag(View v, DragSource source, Object info, int dragAction);
/**
* Sets the drag listner which will be notified when a drag starts or ends.
*/
void setDragListener(DragListener l);
/**
* Remove a previously installed drag listener.
*/
void removeDragListener(DragListener l);
}
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