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Java > Open Source Codes > org > eclipse > debug > internal > ui > views > memory > MemoryViewTreeViewer


1 /*******************************************************************************
2  * Copyright (c) 2006 IBM Corporation and others.
3  * All rights reserved. This program and the accompanying materials
4  * are made available under the terms of the Eclipse Public License v1.0
5  * which accompanies this distribution, and is available at
6  * http://www.eclipse.org/legal/epl-v10.html
7  *
8  * Contributors:
9  * IBM Corporation - initial API and implementation
10  *******************************************************************************/
11
12 package org.eclipse.debug.internal.ui.views.memory;
13
14 import org.eclipse.debug.internal.ui.viewers.model.TreeModelContentProvider;
15 import org.eclipse.debug.internal.ui.viewers.model.provisional.IPresentationContext;
16 import org.eclipse.debug.internal.ui.viewers.model.provisional.TreeModelViewer;
17 import org.eclipse.swt.widgets.Composite;
18
19 /**
20  * Customized tree viewer for the Memory View
21  * This Tree Viewer has a specialized update policy for the memory view.
22  * When the model fires a ADDED delta, the update policy handles the event as follows:
23  * If the ADDED delta is accompanied by SELECT, and the added element is an memory blok, then
24  * the udpate policy asks the Memory View if the it is currently pinned to a memory block. If the view
25  * is currently pinned, then the SELECT delta is ignored.
26  *
27  * If the ADDED delta and SELECT delta are recieved in separate nodes, then the delta will be handled as-is and would
28  * not take the pinning state of the memory view into account.
29  *
30  */
31 public class MemoryViewTreeViewer extends TreeModelViewer {
32
33     public MemoryViewTreeViewer(Composite parent, int style,
34             IPresentationContext context) {
35         super(parent, style, context);
36     }
37     
38     /*
39      * Need to have a customized content provider to define a special update policy for the Memory View
40      * (non-Javadoc)
41      * @see org.eclipse.debug.internal.ui.viewers.model.InternalTreeModelViewer#createContentProvider()
42      */
43     protected TreeModelContentProvider createContentProvider() {
44         return new MemoryViewTreeModelContentProvider();
45     }
46
47 }
48
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