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comparison org.eclipse.jface.examples.databinding/src/org/eclipse/jface/examples/databinding/snippets/Snippet008ComputedValue.d @ 99:5d5bd660917f

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build some databind snippets
author Frank Benoit <benoit@tionex.de>
date Wed, 22 Apr 2009 18:59:26 +0200
parents 6086085e153d
children e884642ad36e
comparison
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98:48d4ee626868 99:5d5bd660917f
8 * Contributors: 8 * Contributors:
9 * Brad Reynolds - initial API and implementation 9 * Brad Reynolds - initial API and implementation
10 * Matthew Hall - bug 260329 10 * Matthew Hall - bug 260329
11 ******************************************************************************/ 11 ******************************************************************************/
12 12
13 package org.eclipse.jface.examples.databinding.snippets; 13 module org.eclipse.jface.examples.databinding.snippets.Snippet008ComputedValue;
14
15 import java.lang.all;
14 16
15 import org.eclipse.core.databinding.DataBindingContext; 17 import org.eclipse.core.databinding.DataBindingContext;
16 import org.eclipse.core.databinding.UpdateValueStrategy; 18 import org.eclipse.core.databinding.UpdateValueStrategy;
17 import org.eclipse.core.databinding.observable.ObservableTracker; 19 import org.eclipse.core.databinding.observable.ObservableTracker;
18 import org.eclipse.core.databinding.observable.Realm; 20 import org.eclipse.core.databinding.observable.Realm;
35 * name as the user enters first and last name. 37 * name as the user enters first and last name.
36 * 38 *
37 * @since 3.2 39 * @since 3.2
38 */ 40 */
39 public class Snippet008ComputedValue { 41 public class Snippet008ComputedValue {
40 /** 42 /**
41 * @param args 43 * @param args
42 */ 44 */
43 public static void main(String[] args) { 45 public static void main(String[] args) {
44 final Display display = new Display(); 46 final Display display = new Display();
45 Realm.runWithDefault(SWTObservables.getRealm(display), new Runnable() { 47 Realm.runWithDefault(SWTObservables.getRealm(display), new Runnable() {
46 public void run() { 48 public void run() {
47 Shell shell = new Shell(display); 49 Shell shell = new Shell(display);
48 shell.setLayout(new FillLayout()); 50 shell.setLayout(new FillLayout());
49 51
50 final UI ui = new UI(shell); 52 final UI ui = new UI(shell);
51 final Data data = new Data(); 53 final Data data = new Data();
52 54
53 // Bind the UI to the Data. 55 // Bind the UI to the Data.
54 DataBindingContext dbc = new DataBindingContext(); 56 DataBindingContext dbc = new DataBindingContext();
55 dbc.bindValue(SWTObservables.observeText(ui.firstName, 57 dbc.bindValue(SWTObservables.observeText(ui.firstName,
56 SWT.Modify), data.firstName); 58 SWT.Modify), data.firstName);
57 dbc.bindValue(SWTObservables.observeText(ui.lastName, 59 dbc.bindValue(SWTObservables.observeText(ui.lastName,
58 SWT.Modify), data.lastName); 60 SWT.Modify), data.lastName);
59 61
60 // Construct the formatted name observable. 62 // Construct the formatted name observable.
61 FormattedName formattedName = new FormattedName(data.firstName, 63 FormattedName formattedName = new FormattedName(data.firstName,
62 data.lastName); 64 data.lastName);
63 65
64 // Bind the formatted name Text to the formatted name 66 // Bind the formatted name Text to the formatted name
65 // observable. 67 // observable.
66 dbc.bindValue(SWTObservables.observeText(ui.formattedName, 68 dbc.bindValue(SWTObservables.observeText(ui.formattedName,
67 SWT.None), formattedName, new UpdateValueStrategy(false, UpdateValueStrategy.POLICY_NEVER), null); 69 SWT.None), formattedName, new UpdateValueStrategy(false, UpdateValueStrategy.POLICY_NEVER), null);
68 70
69 shell.pack(); 71 shell.pack();
70 shell.open(); 72 shell.open();
71 while (!shell.isDisposed()) { 73 while (!shell.isDisposed()) {
72 if (!display.readAndDispatch()) 74 if (!display.readAndDispatch())
73 display.sleep(); 75 display.sleep();
74 } 76 }
75 } 77 }
76 }); 78 });
77 display.dispose(); 79 display.dispose();
78 } 80 }
79 81
80 /** 82 /**
81 * Creates the formatted name on change of the first or last name 83 * Creates the formatted name on change of the first or last name
82 * observables. 84 * observables.
83 * <p> 85 * <p>
84 * The key to understanding ComputedValue is understanding that it knows of 86 * The key to understanding ComputedValue is understanding that it knows of
85 * the observables that are queried without being told. This is done with 87 * the observables that are queried without being told. This is done with
86 * {@link ObservableTracker} voodoo. When calculate() is invoked 88 * {@link ObservableTracker} voodoo. When calculate() is invoked
87 * <code>ObservableTracker</code> records the observables that are 89 * <code>ObservableTracker</code> records the observables that are
88 * queried. It then exposes those observables and <code>ComputedValue</code> 90 * queried. It then exposes those observables and <code>ComputedValue</code>
89 * can listen to changes in those objects and react accordingly. 91 * can listen to changes in those objects and react accordingly.
90 * </p> 92 * </p>
91 * 93 *
92 * @since 3.2 94 * @since 3.2
93 */ 95 */
94 static class FormattedName extends ComputedValue { 96 static class FormattedName extends ComputedValue {
95 private IObservableValue firstName; 97 private IObservableValue firstName;
96 98
97 private IObservableValue lastName; 99 private IObservableValue lastName;
98 100
99 FormattedName(IObservableValue firstName, IObservableValue lastName) { 101 FormattedName(IObservableValue firstName, IObservableValue lastName) {
100 this.firstName = firstName; 102 this.firstName = firstName;
101 this.lastName = lastName; 103 this.lastName = lastName;
102 } 104 }
103 105
104 protected Object calculate() { 106 protected Object calculate() {
105 String lastName = (String) this.lastName.getValue(); 107 String lastName = (String) this.lastName.getValue();
106 String firstName = (String) this.firstName.getValue(); 108 String firstName = (String) this.firstName.getValue();
107 lastName = (lastName != null && lastName.length() > 0) ? lastName 109 lastName = (lastName != null && lastName.length() > 0) ? lastName
108 : "[Last Name]"; 110 : "[Last Name]";
109 firstName = (firstName != null && firstName.length() > 0) ? firstName 111 firstName = (firstName != null && firstName.length() > 0) ? firstName
110 : "[First Name]"; 112 : "[First Name]";
111 113
112 StringBuffer buffer = new StringBuffer(); 114 StringBuffer buffer = new StringBuffer();
113 buffer.append(lastName).append(", ").append(firstName); 115 buffer.append(lastName).append(", ").append(firstName);
114 116
115 return buffer.toString(); 117 return buffer.toString();
116 } 118 }
117 } 119 }
118 120
119 static class Data { 121 static class Data {
120 final WritableValue firstName; 122 final WritableValue firstName;
121 123
122 final WritableValue lastName; 124 final WritableValue lastName;
123 125
124 Data() { 126 Data() {
125 firstName = new WritableValue("", String.class); 127 firstName = new WritableValue("", String.class);
126 lastName = new WritableValue("", String.class); 128 lastName = new WritableValue("", String.class);
127 } 129 }
128 } 130 }
129 131
130 /** 132 /**
131 * Composite that creates the UI. 133 * Composite that creates the UI.
132 * 134 *
133 * @since 3.2 135 * @since 3.2
134 */ 136 */
135 static class UI extends Composite { 137 static class UI extends Composite {
136 final Text firstName; 138 final Text firstName;
137 139
138 final Text lastName; 140 final Text lastName;
139 141
140 final Text formattedName; 142 final Text formattedName;
141 143
142 UI(Composite parent) { 144 UI(Composite parent) {
143 super(parent, SWT.NONE); 145 super(parent, SWT.NONE);
144 146
145 GridLayoutFactory.swtDefaults().numColumns(2).applyTo(this); 147 GridLayoutFactory.swtDefaults().numColumns(2).applyTo(this);
146 148
147 new Label(this, SWT.NONE).setText("First Name:"); 149 new Label(this, SWT.NONE).setText("First Name:");
148 new Label(this, SWT.NONE).setText("Last Name"); 150 new Label(this, SWT.NONE).setText("Last Name");
149 151
150 GridDataFactory gdf = GridDataFactory.swtDefaults().align(SWT.FILL, 152 GridDataFactory gdf = GridDataFactory.swtDefaults().align(SWT.FILL,
151 SWT.FILL).grab(true, false); 153 SWT.FILL).grab(true, false);
152 firstName = new Text(this, SWT.BORDER); 154 firstName = new Text(this, SWT.BORDER);
153 gdf.applyTo(firstName); 155 gdf.applyTo(firstName);
154 156
155 lastName = new Text(this, SWT.BORDER); 157 lastName = new Text(this, SWT.BORDER);
156 gdf.applyTo(lastName); 158 gdf.applyTo(lastName);
157 159
158 gdf = GridDataFactory.swtDefaults().span(2, 1).grab(true, false) 160 gdf = GridDataFactory.swtDefaults().span(2, 1).grab(true, false)
159 .align(SWT.FILL, SWT.BEGINNING); 161 .align(SWT.FILL, SWT.BEGINNING);
160 Label label = new Label(this, SWT.NONE); 162 Label label = new Label(this, SWT.NONE);
161 label.setText("Formatted Name:"); 163 label.setText("Formatted Name:");
162 gdf.applyTo(label); 164 gdf.applyTo(label);
163 165
164 formattedName = new Text(this, SWT.BORDER); 166 formattedName = new Text(this, SWT.BORDER);
165 formattedName.setEditable(false); 167 formattedName.setEditable(false);
166 gdf.applyTo(formattedName); 168 gdf.applyTo(formattedName);
167 } 169 }
168 } 170 }
169 } 171 }
172
173 void main( String[] args ){
174 Snippet008ComputedValue.main(args);
175 }