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comparison org.eclipse.jface.databinding/src/org/eclipse/jface/internal/databinding/swt/ScaleObservableValue.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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children 6be48cf9f95c
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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 * Peter Centgraf - bug 175763
11 *******************************************************************************/
12 module org.eclipse.jface.internal.databinding.swt.ScaleObservableValue;
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.runtime.Assert;
19 import org.eclipse.jface.internal.databinding.provisional.swt.AbstractSWTObservableValue;
20 import org.eclipse.swt.events.SelectionAdapter;
21 import org.eclipse.swt.events.SelectionEvent;
22 import org.eclipse.swt.events.SelectionListener;
23 import org.eclipse.swt.widgets.Scale;
24
25 /**
26 * @since 1.0
27 *
28 */
29 public class ScaleObservableValue : AbstractSWTObservableValue {
30
31 private final Scale scale;
32
33 private final String attribute;
34
35 private bool updating = false;
36
37 private int currentSelection;
38
39 private SelectionListener listener;
40
41 /**
42 * @param scale
43 * @param attribute
44 */
45 public this(Scale scale, String attribute) {
46 super(scale);
47 this.scale = scale;
48 this.attribute = attribute;
49 init();
50 }
51
52 /**
53 * @param realm
54 * @param scale
55 * @param attribute
56 */
57 public this(Realm realm, Scale scale, String attribute) {
58 super(realm, scale);
59 this.scale = scale;
60 this.attribute = attribute;
61 init();
62 }
63
64 private void init() {
65 if (attribute.equals(SWTProperties.SELECTION)) {
66 currentSelection = scale.getSelection();
67 scale.addSelectionListener(listener = new class() SelectionAdapter {
68 public void widgetSelected(SelectionEvent e) {
69 if (!updating) {
70 int newSelection = this.outer.scale
71 .getSelection();
72 notifyIfChanged(currentSelection, newSelection);
73 currentSelection = newSelection;
74 }
75 }
76 });
77 } else if (!attribute.equals(SWTProperties.MIN)
78 && !attribute.equals(SWTProperties.MAX)) {
79 throw new IllegalArgumentException(
80 "Attribute name not valid: " + attribute); //$NON-NLS-1$
81 }
82 }
83
84 public void doSetValue(Object value) {
85 int oldValue;
86 int newValue;
87 try {
88 updating = true;
89 newValue = (cast(Integer) value).intValue();
90 if (attribute.equals(SWTProperties.SELECTION)) {
91 oldValue = scale.getSelection();
92 scale.setSelection(newValue);
93 currentSelection = newValue;
94 } else if (attribute.equals(SWTProperties.MIN)) {
95 oldValue = scale.getMinimum();
96 scale.setMinimum(newValue);
97 } else if (attribute.equals(SWTProperties.MAX)) {
98 oldValue = scale.getMaximum();
99 scale.setMaximum(newValue);
100 } else {
101 Assert.isTrue(false, "invalid attribute name:" + attribute); //$NON-NLS-1$
102 return;
103 }
104
105 notifyIfChanged(oldValue, newValue);
106 } finally {
107 updating = false;
108 }
109 }
110
111 public Object doGetValue() {
112 int value = 0;
113 if (attribute.opEquals(SWTProperties.SELECTION)) {
114 value = scale.getSelection();
115 } else if (attribute.equals(SWTProperties.MIN)) {
116 value = scale.getMinimum();
117 } else if (attribute.equals(SWTProperties.MAX)) {
118 value = scale.getMaximum();
119 }
120 return new Integer(value);
121 }
122
123 public Object getValueType() {
124 return Integer.TYPE;
125 }
126
127 /**
128 * @return attribute being observed
129 */
130 public String getAttribute() {
131 return attribute;
132 }
133
134 /* (non-Javadoc)
135 * @see org.eclipse.core.databinding.observable.value.AbstractObservableValue#dispose()
136 */
137 public synchronized void dispose() {
138 super.dispose();
139
140 if (listener !is null && !scale.isDisposed()) {
141 scale.removeSelectionListener(listener);
142 }
143 listener = null;
144 }
145
146 private void notifyIfChanged(int oldValue, int newValue) {
147 if (oldValue !is newValue) {
148 fireValueChange(Diffs.createValueDiff(new Integer(oldValue),
149 new Integer(newValue)));
150 }
151 }
152 }