Mercurial > projects > dwt2
view org.eclipse.jface.examples.databinding/src/org/eclipse/jface/examples/databinding/snippets/Snippet011ValidateMultipleBindingsSnippet.d @ 90:6086085e153d
Added databinding snippets. unmodified java sources.
author | Frank Benoit <benoit@tionex.de> |
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date | Sun, 19 Apr 2009 11:33:55 +0200 |
parents | |
children | 5d5bd660917f |
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/******************************************************************************* * Copyright (c) 2007 Brad Reynolds and others. * All rights reserved. This program and the accompanying materials * are made available under the terms of the Eclipse Public License v1.0 * which accompanies this distribution, and is available at * http://www.eclipse.org/legal/epl-v10.html * * Contributors: * Brad Reynolds - initial API and implementation ******************************************************************************/ package org.eclipse.jface.examples.databinding.snippets; import org.eclipse.core.databinding.DataBindingContext; import org.eclipse.core.databinding.UpdateValueStrategy; import org.eclipse.core.databinding.observable.Realm; import org.eclipse.core.databinding.observable.value.IObservableValue; import org.eclipse.core.databinding.observable.value.IValueChangeListener; import org.eclipse.core.databinding.observable.value.ValueChangeEvent; import org.eclipse.core.databinding.observable.value.WritableValue; import org.eclipse.core.databinding.validation.IValidator; import org.eclipse.core.databinding.validation.ValidationStatus; import org.eclipse.core.runtime.IStatus; import org.eclipse.jface.databinding.swt.SWTObservables; import org.eclipse.swt.SWT; import org.eclipse.swt.layout.GridLayout; import org.eclipse.swt.widgets.Composite; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Shell; import org.eclipse.swt.widgets.Text; /** * Snippet that validates values across multiple bindings on change of each * observable. If the values of the target observables are not equal the model * is not updated. When the values are equal they will be written to sysout. * * @author Brad Reynolds */ public class Snippet011ValidateMultipleBindingsSnippet { public static void main(String[] args) { Realm.runWithDefault(SWTObservables.getRealm(Display.getDefault()), new Runnable() { public void run() { Snippet011ValidateMultipleBindingsSnippet.run(); } }); } private static void run() { Shell shell = new Shell(); View view = new View(shell); final Model model = new Model(); DataBindingContext dbc = new DataBindingContext(); dbc.bindValue(SWTObservables.observeText(view.text1, SWT.Modify), model.value1, new UpdateValueStrategy() .setAfterConvertValidator(new CrossFieldValidator( model.value2)), null); dbc.bindValue(SWTObservables.observeText(view.text2, SWT.Modify), model.value2, new UpdateValueStrategy() .setAfterConvertValidator(new CrossFieldValidator( model.value1)), null); // DEBUG - print to show value change model.value1.addValueChangeListener(new IValueChangeListener() { public void handleValueChange(ValueChangeEvent event) { System.out.println("Value 1: " + model.value1.getValue()); } }); // DEBUG - print to show value change model.value2.addValueChangeListener(new IValueChangeListener() { public void handleValueChange(ValueChangeEvent event) { System.out.println("Value 2: " + model.value2.getValue()); } }); shell.pack(); shell.open(); Display display = shell.getDisplay(); while (!shell.isDisposed()) { if (!display.readAndDispatch()) display.sleep(); } display.dispose(); } /** * @since 3.2 * */ private static final class CrossFieldValidator implements IValidator { /** * */ private final IObservableValue other; /** * @param model */ private CrossFieldValidator(IObservableValue other) { this.other = other; } public IStatus validate(Object value) { if (!value.equals(other.getValue())) { return ValidationStatus.ok(); } return ValidationStatus.error("values cannot be the same"); } } static class Model { WritableValue value1 = new WritableValue(); WritableValue value2 = new WritableValue(); } static class View { Text text1; Text text2; View(Composite composite) { composite.setLayout(new GridLayout(2, true)); text1 = new Text(composite, SWT.BORDER); text2 = new Text(composite, SWT.BORDER); } } }