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      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 {
     26         public PhoneFavoriteSquareTileView getViewForLocation(int x, int y);
     27     }
     28 
     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      */
     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 
     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 
     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 
     71     public void addOnDragDropListener(OnDragDropListener listener) {
     72         if (!mOnDragDropListeners.contains(listener)) {
     73             mOnDragDropListeners.add(listener);
     74         }
     75     }
     76 
     77     public void removeOnDragDropListener(OnDragDropListener listener) {
     78         if (mOnDragDropListeners.contains(listener)) {
     79             mOnDragDropListeners.remove(listener);
     80         }
     81     }
     82 
     83 }