org.eclipse.jface.examples.databinding.snippets.Snippet010MasterDetail.java Source code

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Here is the source code for org.eclipse.jface.examples.databinding.snippets.Snippet010MasterDetail.java

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/*******************************************************************************
 * Copyright (c) 2007, 2018 Brad Reynolds 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:
 *     Brad Reynolds - initial API and implementation
 *     Matthew Hall - bug 260329
 *     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.observable.Realm;
import org.eclipse.core.databinding.observable.value.IObservableValue;
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.ListViewer;
import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;

/**
 * Snippet that displays a simple master detail use case. A list of persons is
 * displayed in a list and upon selection the name of the selected person will
 * be displayed in a Text widget.
 */
public class Snippet010MasterDetail {
    public static void main(String[] args) {
        final Display display = new Display();
        Realm.runWithDefault(DisplayRealm.getRealm(display), () -> {
            Shell shell = new Shell(display);
            shell.setLayout(new GridLayout());

            Person[] persons = new Person[] { new Person("Me"), new Person("Myself"), new Person("I") };

            ListViewer viewer = new ListViewer(shell);
            viewer.setContentProvider(new ArrayContentProvider());
            viewer.setInput(persons);

            Text name = new Text(shell, SWT.BORDER | SWT.READ_ONLY);

            // 1. Observe changes in selection.
            IObservableValue<Person> selection = ViewerProperties.singleSelection(Person.class).observe(viewer);

            // 2. Observe the name property of the current selection.
            IObservableValue<String> detailObservable = BeanProperties.value(Person.class, "name", String.class)
                    .observeDetail(selection);

            // 3. Bind the Text widget to the name detail (selection's
            // name).
            new DataBindingContext().bindValue(WidgetProperties.text(SWT.NONE).observe(name), detailObservable,
                    new UpdateValueStrategy<>(false, UpdateValueStrategy.POLICY_NEVER), null);

            shell.open();
            while (!shell.isDisposed()) {
                if (!display.readAndDispatch())
                    display.sleep();
            }
        });
        display.dispose();
    }

    public static class Person {
        private String name;
        private PropertyChangeSupport changeSupport = new PropertyChangeSupport(this);

        Person(String name) {
            this.name = name;
        }

        public void addPropertyChangeListener(PropertyChangeListener listener) {
            changeSupport.addPropertyChangeListener(listener);
        }

        public void removePropertyChangeListener(PropertyChangeListener listener) {
            changeSupport.removePropertyChangeListener(listener);
        }

        /**
         * @return Returns the name.
         */
        public String getName() {
            return name;
        }

        @Override
        public String toString() {
            return name;
        }
    }
}