Mercurial > projects > dwt2

comparison org.eclipse.core.databinding/src/org/eclipse/core/internal/databinding/observable/masterdetail/DetailObservableValue.d @ 78:0a55d2d5a946

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Added file for databinding
author Frank Benoit <benoit@tionex.de>
date Tue, 14 Apr 2009 11:35:29 +0200
parents
children 6be48cf9f95c
comparison
equal deleted inserted replaced
76:f05e6e8b2f2d 78:0a55d2d5a946
1 /*******************************************************************************
2 * Copyright (c) 2005, 2007 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 * Brad Reynolds - bug 147515
12 *******************************************************************************/
13 module org.eclipse.core.internal.databinding.observable.masterdetail.DetailObservableValue;
14
15 import java.lang.all;
16
17 import org.eclipse.core.databinding.observable.Diffs;
18 import org.eclipse.core.databinding.observable.IObserving;
19 import org.eclipse.core.databinding.observable.masterdetail.IObservableFactory;
20 import org.eclipse.core.databinding.observable.value.AbstractObservableValue;
21 import org.eclipse.core.databinding.observable.value.IObservableValue;
22 import org.eclipse.core.databinding.observable.value.IValueChangeListener;
23 import org.eclipse.core.databinding.observable.value.ValueChangeEvent;
24 import org.eclipse.core.runtime.Assert;
25
26 /**
27 * @since 1.0
28 *
29 */
30 public class DetailObservableValue : AbstractObservableValue , IObserving {
31
32 private bool updating = false;
33
34 private IValueChangeListener innerChangeListener = new class() IValueChangeListener {
35 public void handleValueChange(ValueChangeEvent event) {
36 if (!updating) {
37 fireValueChange(event.diff);
38 }
39 }
40 };
41
42 private Object currentOuterValue;
43
44 private IObservableValue innerObservableValue;
45
46 private Object detailType;
47
48 private IObservableValue outerObservableValue;
49
50 private IObservableFactory factory;
51
52 /**
53 * @param outerObservableValue
54 * @param factory
55 * @param detailType
56 */
57 public this(IObservableValue outerObservableValue,
58 IObservableFactory factory, Object detailType) {
59 super(outerObservableValue.getRealm());
60 this.factory = factory;
61 this.detailType = detailType;
62 this.outerObservableValue = outerObservableValue;
63 updateInnerObservableValue(outerObservableValue);
64
65 outerObservableValue.addValueChangeListener(outerChangeListener);
66 }
67
68 IValueChangeListener outerChangeListener = new class() IValueChangeListener {
69 public void handleValueChange(ValueChangeEvent event) {
70 Object oldValue = doGetValue();
71 updateInnerObservableValue(outerObservableValue);
72 fireValueChange(Diffs.createValueDiff(oldValue, doGetValue()));
73 }
74 };
75
76 private void updateInnerObservableValue(
77 IObservableValue outerObservableValue) {
78 currentOuterValue = outerObservableValue.getValue();
79 if (innerObservableValue !is null) {
80 innerObservableValue.removeValueChangeListener(innerChangeListener);
81 innerObservableValue.dispose();
82 }
83 if (currentOuterValue is null) {
84 innerObservableValue = null;
85 } else {
86 this.innerObservableValue = cast(IObservableValue) factory
87 .createObservable(currentOuterValue);
88 Object innerValueType = innerObservableValue.getValueType();
89
90 if (detailType !is null) {
91 Assert
92 .isTrue(
93 detailType.equals(innerValueType),
94 "Cannot change value type in a nested observable value, from " + innerValueType + " to " + detailType); //$NON-NLS-1$ //$NON-NLS-2$
95 }
96 innerObservableValue.addValueChangeListener(innerChangeListener);
97 }
98 }
99
100 public void doSetValue(Object value) {
101 if (innerObservableValue !is null)
102 innerObservableValue.setValue(value);
103 }
104
105 public Object doGetValue() {
106 return innerObservableValue is null ? null : innerObservableValue
107 .getValue();
108 }
109
110 public Object getValueType() {
111 return detailType;
112 }
113
114 public void dispose() {
115 super.dispose();
116
117 if (outerObservableValue !is null) {
118 outerObservableValue.removeValueChangeListener(outerChangeListener);
119 outerObservableValue.dispose();
120 }
121 if (innerObservableValue !is null) {
122 innerObservableValue.removeValueChangeListener(innerChangeListener);
123 innerObservableValue.dispose();
124 }
125 currentOuterValue = null;
126 factory = null;
127 innerObservableValue = null;
128 innerChangeListener = null;
129 }
130
131 public Object getObserved() {
132 if ( null !is cast(IObserving)innerObservableValue ) {
133 return (cast(IObserving)innerObservableValue).getObserved();
134 }
135 return null;
136 }
137
138 }