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comparison org.eclipse.jface.databinding/src/org/eclipse/jface/internal/databinding/swt/SingleSelectionObservableValue.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) 2005, 2008 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 * Brad Reynolds - bug 164653
11 *******************************************************************************/
12 module org.eclipse.jface.internal.databinding.swt.SingleSelectionObservableValue;
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.jface.internal.databinding.provisional.swt.AbstractSWTObservableValue;
19 import org.eclipse.swt.widgets.Control;
20
21 /**
22 * @since 1.0
23 *
24 */
25 abstract public class SingleSelectionObservableValue :
26 AbstractSWTObservableValue {
27
28 private bool updating = false;
29
30 private int currentSelection;
31
32 /**
33 * @param control
34 * the control
35 */
36 public this(Control control) {
37 super(control);
38 init();
39 }
40
41 /**
42 * @param realm
43 * @param control
44 */
45 public this(Realm realm, Control control) {
46 super(realm, control);
47 init();
48 }
49
50 private void init() {
51 currentSelection = doGetSelectionIndex();
52 doAddSelectionListener(new class() Runnable{
53 public void run() {
54 if (!updating) {
55 int newSelection = doGetSelectionIndex();
56 notifyIfChanged(currentSelection, newSelection);
57 currentSelection = newSelection;
58 }
59 }
60 });
61 }
62
63 /**
64 * @param runnable
65 */
66 protected abstract void doAddSelectionListener(Runnable runnable);
67
68 public void doSetValue(Object value) {
69 try {
70 updating = true;
71 int intValue = (cast(Integer) value).intValue();
72 doSetSelectionIndex(intValue);
73 notifyIfChanged(currentSelection, intValue);
74 currentSelection = intValue;
75 } finally {
76 updating = false;
77 }
78 }
79
80 /**
81 * @param intValue
82 * the selection index
83 */
84 protected abstract void doSetSelectionIndex(int intValue);
85
86 public Object doGetValue() {
87 return new Integer(doGetSelectionIndex());
88 }
89
90 /**
91 * @return the selection index
92 */
93 protected abstract int doGetSelectionIndex();
94
95 public Object getValueType() {
96 return Integer.TYPE;
97 }
98
99 private void notifyIfChanged(int oldValue, int newValue) {
100 if (oldValue !is newValue) {
101 fireValueChange(Diffs.createValueDiff(new Integer(
102 oldValue), new Integer(newValue)));
103 }
104 }
105 }