1 package com.android.dialer.list;
2 
3 import android.util.Log;
4 import android.view.View;
5 
6 import java.util.ArrayList;
7 import java.util.List;
8 
9 /**
10  * Class that handles and combines drag events generated from multiple views, and then fires
11  * off events to any OnDragDropListeners that have registered for callbacks.
12  */
13 public class DragDropController {
14 
15     private final List<OnDragDropListener> mOnDragDropListeners =
16             new ArrayList<OnDragDropListener>();
17     private final DragItemContainer mDragItemContainer;
18     private final int[] mLocationOnScreen = new int[2];
19 
20     /**
21      * Callback interface used to retrieve views based on the current touch coordinates of the
22      * drag event. The {@link DragItemContainer} houses the draggable views that this
23      * {@link DragDropController} controls.
24      */
25     public interface DragItemContainer {
getViewForLocation(int x, int y)26         public PhoneFavoriteSquareTileView getViewForLocation(int x, int y);
27     }
28 
DragDropController(DragItemContainer dragItemContainer)29     public DragDropController(DragItemContainer dragItemContainer) {
30         mDragItemContainer = dragItemContainer;
31     }
32 
33     /**
34      * @return True if the drag is started, false if the drag is cancelled for some reason.
35      */
handleDragStarted(int x, int y)36     boolean handleDragStarted(int x, int y) {
37         final PhoneFavoriteSquareTileView tileView = mDragItemContainer.getViewForLocation(x, y);
38         if (tileView == null) {
39             return false;
40         }
41         for (int i = 0; i < mOnDragDropListeners.size(); i++) {
42             mOnDragDropListeners.get(i).onDragStarted(x, y, tileView);
43         }
44 
45         return true;
46     }
47 
handleDragHovered(View v, int x, int y)48     public void handleDragHovered(View v, int x, int y) {
49         v.getLocationOnScreen(mLocationOnScreen);
50         final int screenX = x + mLocationOnScreen[0];
51         final int screenY = y + mLocationOnScreen[1];
52         final PhoneFavoriteSquareTileView view = mDragItemContainer.getViewForLocation(
53                 screenX, screenY);
54         for (int i = 0; i < mOnDragDropListeners.size(); i++) {
55             mOnDragDropListeners.get(i).onDragHovered(screenX, screenY, view);
56         }
57     }
58 
handleDragFinished(int x, int y, boolean isRemoveView)59     public void handleDragFinished(int x, int y, boolean isRemoveView) {
60         if (isRemoveView) {
61             for (int i = 0; i < mOnDragDropListeners.size(); i++) {
62                 mOnDragDropListeners.get(i).onDroppedOnRemove();
63             }
64         }
65 
66         for (int i = 0; i < mOnDragDropListeners.size(); i++) {
67             mOnDragDropListeners.get(i).onDragFinished(x, y);
68         }
69     }
70 
addOnDragDropListener(OnDragDropListener listener)71     public void addOnDragDropListener(OnDragDropListener listener) {
72         if (!mOnDragDropListeners.contains(listener)) {
73             mOnDragDropListeners.add(listener);
74         }
75     }
76 
removeOnDragDropListener(OnDragDropListener listener)77     public void removeOnDragDropListener(OnDragDropListener listener) {
78         if (mOnDragDropListeners.contains(listener)) {
79             mOnDragDropListeners.remove(listener);
80         }
81     }
82 
83 }