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comparison org.eclipse.jface.databinding/src/org/eclipse/jface/internal/databinding/viewers/ViewerInputObservableValue.d @ 78:0a55d2d5a946

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Added file for databinding
author Frank Benoit <benoit@tionex.de>
date Tue, 14 Apr 2009 11:35:29 +0200
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76:f05e6e8b2f2d 78:0a55d2d5a946
1 /*******************************************************************************
2 * Copyright (c) 2007 Matthew Hall 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 * Matthew Hall - initial API and implementation (bug 206839)
10 *******************************************************************************/
11
12 module org.eclipse.jface.internal.databinding.viewers.ViewerInputObservableValue;
13
14 import java.lang.all;
15
16 import org.eclipse.core.databinding.observable.Diffs;
17 import org.eclipse.core.databinding.observable.Realm;
18 import org.eclipse.core.databinding.observable.value.AbstractObservableValue;
19 import org.eclipse.jface.util.Util;
20 import org.eclipse.jface.viewers.Viewer;
21
22 /**
23 * Observes the input of a <code>Viewer</code>.
24 * <p>
25 * This observer is blind to changes in the viewer's input unless its
26 * {@link #setValue(Object)} method is called directly.
27 *
28 * @since 1.2
29 */
30 public class ViewerInputObservableValue : AbstractObservableValue {
31
32 private final Viewer viewer;
33
34 /**
35 * Constructs a new instance associated with the provided <code>viewer</code>.
36 *
37 * @param realm
38 * @param viewer
39 */
40 public this( Realm realm, Viewer viewer ) {
41 super( realm );
42 if ( viewer is null ) {
43 throw new IllegalArgumentException( "The 'viewer' parameter is null." ); //$NON-NLS-1$
44 }
45
46 this.viewer = viewer;
47 }
48
49 /**
50 * Sets the input to the provided <code>value</code>. Value change events are
51 * fired after input is set in the viewer.
52 *
53 * @param value object to set as input
54 */
55 protected void doSetValue( Object value ) {
56 Object oldValue = doGetValue();
57 viewer.setInput( value );
58 if ( !Util.equals( oldValue, value ) ) {
59 fireValueChange( Diffs.createValueDiff( oldValue, value ) );
60 }
61 }
62
63 /**
64 * Retrieves the current input.
65 *
66 * @return the current input
67 */
68 protected Object doGetValue() {
69 return viewer.getInput();
70 }
71
72 public Object getValueType() {
73 return null;
74 }
75 }