source/ch/cyberduck/ui/cocoa/delegate/CollectionMenuDelegate.java

   1 package ch.cyberduck.ui.cocoa.delegate;
   2
   3 /*
   4  * Copyright (c) 2002-2009 David Kocher. All rights reserved.
   5  *
   6  * http://cyberduck.ch/
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * Bug fixes, suggestions and comments should be sent to:
  19  * dkocher@cyberduck.ch
  20  */
  21
  22 import ch.cyberduck.binding.application.NSMenu;
  23 import ch.cyberduck.core.Collection;
  24 import ch.cyberduck.core.CollectionListener;
  25
  26 import org.rococoa.cocoa.foundation.NSInteger;
  27
  28 /**
  29  * @version $Id$
  30  */
  31 public abstract class CollectionMenuDelegate<T> extends AbstractMenuDelegate implements CollectionListener<T> {
  32
  33     private Collection<T> collection;
  34
  35     public CollectionMenuDelegate(Collection<T> c) {
  36         this.collection = c;
  37         this.collection.addListener(this);
  38     }
  39
  40     @Override
  41     public NSInteger numberOfItemsInMenu(NSMenu menu) {
  42         if(this.isPopulated()) {
  43             // If you return a negative value, the number of items is left unchanged
  44             // and menu:updateItem:atIndex:shouldCancel: is not called.
  45             return new NSInteger(-1);
  46         }
  47         if(collection.size() > 0) {
  48             // The number of history plus a delimiter and the 'Clear' menu
  49             return new NSInteger(collection.size());
  50         }
  51         return new NSInteger(1);
  52     }
  53
  54     @Override
  55     public void collectionItemAdded(T item) {
  56         this.setNeedsUpdate(true);
  57     }
  58
  59     @Override
  60     public void collectionItemRemoved(T item) {
  61         this.setNeedsUpdate(true);
  62     }
  63
  64     @Override
  65     public void collectionItemChanged(T item) {
  66         this.setNeedsUpdate(true);
  67     }
  68
  69     @Override
  70     public void collectionLoaded() {
  71         this.setNeedsUpdate(true);
  72     }
  73
  74     @Override
  75     public void invalidate() {
  76         this.collection.removeListener(this);
  77         super.invalidate();
  78     }
  79 }