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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 import android.view.View;
     20 
     21 import com.android.launcher3.DropTarget.DragObject;
     22 import com.android.launcher3.logging.UserEventDispatcher.LaunchSourceProvider;
     23 
     24 /**
     25  * Interface defining an object that can originate a drag.
     26  */
     27 public interface DragSource extends LaunchSourceProvider {
     28 
     29     /**
     30      * @return whether items dragged from this source supports
     31      */
     32     boolean supportsFlingToDelete();
     33 
     34     /**
     35      * @return whether items dragged from this source supports 'App Info'
     36      */
     37     boolean supportsAppInfoDropTarget();
     38 
     39     /**
     40      * @return whether items dragged from this source supports 'Delete' drop target (e.g. to remove
     41      * a shortcut.) If this returns false, the drop target will say "Cancel" instead of "Remove."
     42      */
     43     boolean supportsDeleteDropTarget();
     44 
     45     /*
     46      * @return the scale of the icons over the workspace icon size
     47      */
     48     float getIntrinsicIconScaleFactor();
     49 
     50     /**
     51      * A callback specifically made back to the source after an item from this source has been flung
     52      * to be deleted on a DropTarget.  In such a situation, this method will be called after
     53      * onDropCompleted, and more importantly, after the fling animation has completed.
     54      */
     55     void onFlingToDeleteCompleted();
     56 
     57     /**
     58      * A callback made back to the source after an item from this source has been dropped on a
     59      * DropTarget.
     60      */
     61     void onDropCompleted(View target, DragObject d, boolean isFlingToDelete, boolean success);
     62 }
     63