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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.browser;
     18 
     19 import android.app.Activity;
     20 import android.content.ClipData;
     21 import android.content.ContentResolver;
     22 import android.content.ContentUris;
     23 import android.content.ContentValues;
     24 import android.database.Cursor;
     25 import android.net.Uri;
     26 import android.provider.BrowserContract;
     27 import android.view.ActionMode;
     28 import android.view.ActionMode.Callback;
     29 import android.view.DragEvent;
     30 import android.view.Menu;
     31 import android.view.MenuItem;
     32 import android.view.View;
     33 import android.view.View.OnDragListener;
     34 import android.view.ViewGroup;
     35 
     36 public class BookmarkDragHandler implements Callback {
     37 
     38     public static interface BookmarkDragController {
     39         boolean startDrag(Cursor item);
     40 
     41         ViewGroup getActionModeView(ActionMode mode, BookmarkDragState state);
     42         void actionItemClicked(View v, BookmarkDragState state);
     43     }
     44 
     45     public static interface BookmarkDragAdapter {
     46         void setBookmarkDragHandler(BookmarkDragHandler handler);
     47         Cursor getItemForView(View v);
     48     }
     49 
     50     public static class BookmarkDragState {
     51         public long id;
     52         public long parent;
     53         public Object extraState;
     54     }
     55 
     56     static final String BOOKMARK_DRAG_LABEL = "com.android.browser.BOOKMARK_LABEL";
     57 
     58     private Activity mActivity;
     59     private BookmarkDragController mDragController;
     60     private BookmarkDragAdapter mDragAdapter;
     61     private ActionMode mActionMode;
     62     private BookmarkDragState mDragState;
     63 
     64     public BookmarkDragHandler(Activity activity, BookmarkDragController controller,
     65             BookmarkDragAdapter adapter) {
     66         mActivity = activity;
     67         mDragController = controller;
     68         mDragAdapter = adapter;
     69         mDragAdapter.setBookmarkDragHandler(this);
     70     }
     71 
     72     public boolean startDrag(View view, Cursor item, long id, Object extraState) {
     73         if (!mDragController.startDrag(item)) {
     74             return false;
     75         }
     76         Uri uri = ContentUris.withAppendedId(
     77                 BrowserContract.Bookmarks.CONTENT_URI, id);
     78         ClipData data = ClipData.newRawUri(BOOKMARK_DRAG_LABEL, uri);
     79         BookmarkDragState state = new BookmarkDragState();
     80         state.id = id;
     81         state.parent = item.getLong(BookmarksLoader.COLUMN_INDEX_PARENT);
     82         state.extraState = extraState;
     83         mDragState = state;
     84         view.startDrag(data, new View.DragShadowBuilder(view), state, 0);
     85         mActionMode = view.startActionMode(this);
     86         return true;
     87     }
     88 
     89     public void registerBookmarkDragHandler(View view) {
     90         view.setOnDragListener(mBookmarkDragListener);
     91     }
     92 
     93     private OnDragListener mBookmarkDragListener = new OnDragListener() {
     94 
     95         @Override
     96         public boolean onDrag(View v, DragEvent event) {
     97             Cursor c = mDragAdapter.getItemForView(v);
     98             BookmarkDragState state = (BookmarkDragState) event.getLocalState();
     99             switch (event.getAction()) {
    100             case DragEvent.ACTION_DRAG_STARTED:
    101                 return true;
    102             case DragEvent.ACTION_DROP:
    103                 long id = c.getLong(BookmarksLoader.COLUMN_INDEX_ID);
    104                 if (id == state.id) {
    105                     // We dropped onto ourselves, show the context menu
    106                     v.showContextMenu();
    107                     return false;
    108                 }
    109                 long parent = c.getLong(BookmarksLoader.COLUMN_INDEX_PARENT);
    110                 if (isFolder(c)) {
    111                     parent = c.getLong(BookmarksLoader.COLUMN_INDEX_ID);
    112                 }
    113                 if (parent != state.parent) {
    114                     ContentResolver cr = mActivity.getContentResolver();
    115                     ContentValues values = new ContentValues();
    116                     values.put(BrowserContract.Bookmarks.PARENT, parent);
    117                     Uri uri = event.getClipData().getItemAt(0).getUri();
    118                     cr.update(uri, values, null, null);
    119                 }
    120                 break;
    121             }
    122             return false;
    123         }
    124     };
    125 
    126     private OnDragListener mActionModeDragListener = new OnDragListener() {
    127 
    128         @Override
    129         public boolean onDrag(View v, DragEvent event) {
    130             BookmarkDragState state = (BookmarkDragState) event.getLocalState();
    131             switch (event.getAction()) {
    132             case DragEvent.ACTION_DRAG_STARTED:
    133                 return true;
    134             case DragEvent.ACTION_DROP:
    135                 mDragController.actionItemClicked(v, state);
    136                 // fall through
    137             case DragEvent.ACTION_DRAG_ENDED:
    138                 if (mActionMode != null) {
    139                     mActionMode.finish();
    140                     mActionMode = null;
    141                 }
    142                 return true;
    143             }
    144             return false;
    145         }
    146     };
    147 
    148     static boolean isFolder(Cursor c) {
    149         return c.getInt(BookmarksLoader.COLUMN_INDEX_IS_FOLDER) != 0;
    150     }
    151 
    152     @Override
    153     public boolean onCreateActionMode(ActionMode mode, Menu menu) {
    154         ViewGroup view = mDragController.getActionModeView(mode, mDragState);
    155         int count = view.getChildCount();
    156         for (int i = 0; i < count; i++) {
    157             view.getChildAt(i).setOnDragListener(mActionModeDragListener);
    158         }
    159         mode.setCustomView(view);
    160         return true;
    161     }
    162 
    163     @Override
    164     public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
    165         return true;
    166     }
    167 
    168     @Override
    169     public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
    170         return false;
    171     }
    172 
    173     @Override
    174     public void onDestroyActionMode(ActionMode mode) {
    175     }
    176 
    177 }
    178