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      1 /*
      2  * Copyright (C) 2011 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.content.Context;
     20 import android.text.TextUtils;
     21 import android.util.AttributeSet;
     22 import android.view.View;
     23 
     24 import com.android.launcher3.dragndrop.DragOptions;
     25 import com.android.launcher3.folder.Folder;
     26 
     27 public class DeleteDropTarget extends ButtonDropTarget {
     28 
     29     public DeleteDropTarget(Context context, AttributeSet attrs) {
     30         this(context, attrs, 0);
     31     }
     32 
     33     public DeleteDropTarget(Context context, AttributeSet attrs, int defStyle) {
     34         super(context, attrs, defStyle);
     35     }
     36 
     37     @Override
     38     protected void onFinishInflate() {
     39         super.onFinishInflate();
     40         // Get the hover color
     41         mHoverColor = getResources().getColor(R.color.delete_target_hover_tint);
     42 
     43         setDrawable(R.drawable.ic_remove_launcher);
     44     }
     45 
     46     @Override
     47     public void onDragStart(DropTarget.DragObject dragObject, DragOptions options) {
     48         super.onDragStart(dragObject, options);
     49         setTextBasedOnDragSource(dragObject.dragSource);
     50     }
     51 
     52     /** @return true for items that should have a "Remove" action in accessibility. */
     53     public static boolean supportsAccessibleDrop(ItemInfo info) {
     54         return (info instanceof ShortcutInfo)
     55                 || (info instanceof LauncherAppWidgetInfo)
     56                 || (info instanceof FolderInfo);
     57     }
     58 
     59     @Override
     60     protected boolean supportsDrop(DragSource source, ItemInfo info) {
     61         return true;
     62     }
     63 
     64     /**
     65      * Set the drop target's text to either "Remove" or "Cancel" depending on the drag source.
     66      */
     67     public void setTextBasedOnDragSource(DragSource dragSource) {
     68         if (!TextUtils.isEmpty(getText())) {
     69             setText(dragSource.supportsDeleteDropTarget() ? R.string.remove_drop_target_label
     70                     : android.R.string.cancel);
     71         }
     72     }
     73 
     74     @Override
     75     public void completeDrop(DragObject d) {
     76         ItemInfo item = d.dragInfo;
     77         if ((d.dragSource instanceof Workspace) || (d.dragSource instanceof Folder)) {
     78             removeWorkspaceOrFolderItem(mLauncher, item, null);
     79         }
     80     }
     81 
     82     /**
     83      * Removes the item from the workspace. If the view is not null, it also removes the view.
     84      */
     85     public static void removeWorkspaceOrFolderItem(Launcher launcher, ItemInfo item, View view) {
     86         // Remove the item from launcher and the db, we can ignore the containerInfo in this call
     87         // because we already remove the drag view from the folder (if the drag originated from
     88         // a folder) in Folder.beginDrag()
     89         launcher.removeItem(view, item, true /* deleteFromDb */);
     90         launcher.getWorkspace().stripEmptyScreens();
     91         launcher.getDragLayer().announceForAccessibility(launcher.getString(R.string.item_removed));
     92     }
     93 }
     94