content: /*
   * 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.lb.launcher;
  
  import android.content.Context;
  import android.graphics.PointF;
  import android.graphics.Rect;
  import android.util.Log;
  
  /**
   * Interface defining an object that can receive a drag.
   *
   */
  public interface DropTarget {
  
      public static final String TAG = "DropTarget";
  
      class DragObject {
          public int x = -1;
          public int y = -1;
  
          /** X offset from the upper-left corner of the cell to where we touched.  */
          public int xOffset = -1;
  
          /** Y offset from the upper-left corner of the cell to where we touched.  */
          public int yOffset = -1;
  
          /** This indicates whether a drag is in final stages, either drop or cancel. It
           * differentiates onDragExit, since this is called when the drag is ending, above
           * the current drag target, or when the drag moves off the current drag object.
           */
          public boolean dragComplete = false;
  
          /** The view that moves around while you drag.  */
          public DragView dragView = null;
  
          /** The data associated with the object being dragged */
          public Object dragInfo = null;
  
          /** Where the drag originated */
          public DragSource dragSource = null;
  
          /** Post drag animation runnable */
          public Runnable postAnimationRunnable = null;
  
          /** Indicates that the drag operation was cancelled */
          public boolean cancelled = false;
  
          /** Defers removing the DragView from the DragLayer until after the drop animation. */
          public boolean deferDragViewCleanupPostAnimation = true;
  
          public DragObject() {
          }
      }
  
      public static class DragEnforcer implements DragController.DragListener {
          int dragParity = 0;
  
          public DragEnforcer(Context context) {
              Launcher launcher = (Launcher) context;
              launcher.getDragController().addDragListener(this);
          }
  
          void onDragEnter() {
              dragParity++;
              if (dragParity != 1) {
                  Log.e(TAG, "onDragEnter: Drag contract violated: " + dragParity);
              }
          }
  
          void onDragExit() {
              dragParity--;
              if (dragParity != 0) {
                  Log.e(TAG, "onDragExit: Drag contract violated: " + dragParity);
              }
          }
  
          @Override
          public void onDragStart(DragSource source, Object info, int dragAction) {
              if (dragParity != 0) {
                  Log.e(TAG, "onDragEnter: Drag contract violated: " + dragParity);
              }
          }
  
          @Override
          public void onDragEnd() {
              if (dragParity != 0) {
                  Log.e(TAG, "onDragExit: Drag contract violated: " + dragParity);
              }
          }
      }
  
      /**
       * Used to temporarily disable certain drop targets
       *
       * @return boolean specifying whether this drop target is currently enabled
       */
      boolean isDropEnabled();
  
      /**
       * Handle an object being dropped on the DropTarget
       * 
       * @param source DragSource where the drag started
       * @param x X coordinate of the drop location
       * @param y Y coordinate of the drop location
       * @param xOffset Horizontal offset with the object being dragged where the original
       *          touch happened
       * @param yOffset Vertical offset with the object being dragged where the original
       *          touch happened
       * @param dragView The DragView that's being dragged around on screen.
       * @param dragInfo Data associated with the object being dragged
       *
       */
      void onDrop(DragObject dragObject);
  
      void onDragEnter(DragObject dragObject);
  
      void onDragOver(DragObject dragObject);
  
      void onDragExit(DragObject dragObject);
  
      /**
       * Handle an object being dropped as a result of flinging to delete and will be called in place
       * of onDrop().  (This is only called on objects that are set as the DragController's
       * fling-to-delete target.
       */
      void onFlingToDelete(DragObject dragObject, int x, int y, PointF vec);
  
      /**
       * Check if a drop action can occur at, or near, the requested location.
       * This will be called just before onDrop.
       * 
       * @param source DragSource where the drag started
       * @param x X coordinate of the drop location
       * @param y Y coordinate of the drop location
       * @param xOffset Horizontal offset with the object being dragged where the
       *            original touch happened
       * @param yOffset Vertical offset with the object being dragged where the
       *            original touch happened
       * @param dragView The DragView that's being dragged around on screen.
       * @param dragInfo Data associated with the object being dragged
       * @return True if the drop will be accepted, false otherwise.
       */
      boolean acceptDrop(DragObject dragObject);
  
      // These methods are implemented in Views
      void getHitRectRelativeToDragLayer(Rect outRect);
      void getLocationInDragLayer(int[] loc);
      int getLeft();
      int getTop();
  }
  