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/*******************************************************************************
* Copyright (c) 2009, 2018 Eric Rizzo and others.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* Eric Rizzo - initial API and implementation
* Simon Scholz <simon.scholz@vogella.com> - Bug 434283
******************************************************************************/
package org.eclipse.jface.examples.databinding.snippets;
import java.beans.PropertyChangeListener;
import java.beans.PropertyChangeSupport;
import org.eclipse.core.databinding.DataBindingContext;
import org.eclipse.core.databinding.UpdateValueStrategy;
import org.eclipse.core.databinding.beans.typed.BeanProperties;
import org.eclipse.core.databinding.beans.typed.PojoProperties;
import org.eclipse.core.databinding.conversion.EnumConverters;
import org.eclipse.core.databinding.observable.Realm;
import org.eclipse.jface.databinding.swt.DisplayRealm;
import org.eclipse.jface.databinding.swt.typed.WidgetProperties;
import org.eclipse.jface.databinding.viewers.typed.ViewerProperties;
import org.eclipse.jface.viewers.ArrayContentProvider;
import org.eclipse.jface.viewers.ComboViewer;
import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.RowLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;
public class Snippet034ComboViewerAndEnum {
public static void main(String[] args) {
final Display display = new Display();
final Person model = new Person("Pat", Gender.UNKNOWN);
Realm.runWithDefault(DisplayRealm.getRealm(display), () -> {
Shell shell = new View(model).createShell();
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) {
display.sleep();
}
}
});
// Print the results
System.out.println("person.getName() = " + model.getName());
System.out.println("person.getGender() = " + model.getGender());
}
enum Gender {
MALE("Male"), FEMALE("Female"), UNKNOWN("Unknown"), OTHER("Other");
private String displayName;
private Gender(String displayName) {
this.displayName = displayName;
}
@Override
public String toString() {
return displayName;
}
}
/**
* The data model class.
* <p>
* In this example, we only push changes from the GUI to the model, so we don't
* worry about implementing JavaBeans bound properties. If we need our GUI to
* automatically reflect changes in the Person object, the Person object would
* need to implement the JavaBeans property change listener methods.
*/
static class Person {
private String name;
private Gender gender;
private PropertyChangeSupport propertyChangeSupport = new PropertyChangeSupport(this);
public Person(String name, Gender gender) {
this.name = name;
this.gender = gender;
}
public String getName() {
return name;
}
public void setName(String newName) {
String old = this.name;
this.name = newName;
propertyChangeSupport.firePropertyChange("name", old, name);
}
public Gender getGender() {
return gender;
}
public void setGender(Gender newGender) {
Gender old = this.gender;
this.gender = newGender;
propertyChangeSupport.firePropertyChange("gender", old, gender);
}
public void addPropertyChangeListener(String propertyName, PropertyChangeListener listener) {
propertyChangeSupport.addPropertyChangeListener(propertyName, listener);
}
public void removePropertyChangeListener(String propertyName, PropertyChangeListener listener) {
propertyChangeSupport.removePropertyChangeListener(propertyName, listener);
}
}
/** The GUI view. */
static class View {
private Person viewModel;
private Text name;
private ComboViewer gender;
private Label genderText;
public View(Person viewModel) {
this.viewModel = viewModel;
}
public Shell createShell() {
// Build a UI
Display display = Display.getDefault();
Shell shell = new Shell(display);
RowLayout layout = new RowLayout(SWT.VERTICAL);
layout.fill = true;
layout.marginWidth = layout.marginHeight = 5;
shell.setLayout(layout);
name = new Text(shell, SWT.BORDER);
gender = new ComboViewer(shell, SWT.READ_ONLY);
genderText = new Label(shell, SWT.NONE);
// Here's the first key to binding a combo to an Enum:
// First give it an ArrayContentProvider,
// then set the input to the list of values from the Enum.
gender.setContentProvider(ArrayContentProvider.getInstance());
gender.setInput(Gender.values());
// Bind the fields
DataBindingContext bindingContext = new DataBindingContext();
bindingContext.bindValue(WidgetProperties.text(SWT.Modify).observe(name),
PojoProperties.value(Person.class, "name").observe(viewModel));
// The second key to binding a combo to an Enum is to use a
// selection observable from the ComboViewer:
bindingContext.bindValue(ViewerProperties.singleSelection(Gender.class).observe(gender),
PojoProperties.value(Person.class, "gender").observe(viewModel));
// The EnumConverters class is convenient when binding an enum in a situation
// where a Viewer can not be used
bindingContext.bindValue(WidgetProperties.text().observe(genderText),
BeanProperties.value(Person.class, "gender", Gender.class).observe(viewModel), null,
UpdateValueStrategy.create(EnumConverters.toString(Gender.class)));
shell.pack();
shell.open();
return shell;
}
}
}
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