package com.android.dialer.list; import android.util.Log; import android.view.View; import com.android.contacts.common.compat.CompatUtils; import java.util.ArrayList; import java.util.List; /** * Class that handles and combines drag events generated from multiple views, and then fires * off events to any OnDragDropListeners that have registered for callbacks. */ public class DragDropController { private final List mOnDragDropListeners = new ArrayList(); private final DragItemContainer mDragItemContainer; private final int[] mLocationOnScreen = new int[2]; /** * Callback interface used to retrieve views based on the current touch coordinates of the * drag event. The {@link DragItemContainer} houses the draggable views that this * {@link DragDropController} controls. */ public interface DragItemContainer { public PhoneFavoriteSquareTileView getViewForLocation(int x, int y); } public DragDropController(DragItemContainer dragItemContainer) { mDragItemContainer = dragItemContainer; } /** * @return True if the drag is started, false if the drag is cancelled for some reason. */ boolean handleDragStarted(View v, int x, int y) { int screenX = x; int screenY = y; // The coordinates in dragEvent of DragEvent.ACTION_DRAG_STARTED before NYC is window-related. // This is fixed in NYC. if (CompatUtils.isNCompatible()) { v.getLocationOnScreen(mLocationOnScreen); screenX = x + mLocationOnScreen[0]; screenY = y + mLocationOnScreen[1]; } final PhoneFavoriteSquareTileView tileView = mDragItemContainer.getViewForLocation( screenX, screenY); if (tileView == null) { return false; } for (int i = 0; i < mOnDragDropListeners.size(); i++) { mOnDragDropListeners.get(i).onDragStarted(screenX, screenY, tileView); } return true; } public void handleDragHovered(View v, int x, int y) { v.getLocationOnScreen(mLocationOnScreen); final int screenX = x + mLocationOnScreen[0]; final int screenY = y + mLocationOnScreen[1]; final PhoneFavoriteSquareTileView view = mDragItemContainer.getViewForLocation( screenX, screenY); for (int i = 0; i < mOnDragDropListeners.size(); i++) { mOnDragDropListeners.get(i).onDragHovered(screenX, screenY, view); } } public void handleDragFinished(int x, int y, boolean isRemoveView) { if (isRemoveView) { for (int i = 0; i < mOnDragDropListeners.size(); i++) { mOnDragDropListeners.get(i).onDroppedOnRemove(); } } for (int i = 0; i < mOnDragDropListeners.size(); i++) { mOnDragDropListeners.get(i).onDragFinished(x, y); } } public void addOnDragDropListener(OnDragDropListener listener) { if (!mOnDragDropListeners.contains(listener)) { mOnDragDropListeners.add(listener); } } public void removeOnDragDropListener(OnDragDropListener listener) { if (mOnDragDropListeners.contains(listener)) { mOnDragDropListeners.remove(listener); } } }