org.eclipse.rap.demo.databinding.Snippet000HelloWorld.java Source code

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Here is the source code for org.eclipse.rap.demo.databinding.Snippet000HelloWorld.java

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/*******************************************************************************
 * Copyright (c) 2006, 2012 The Pampered Chef, Inc 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:
 *    The Pampered Chef, Inc. - initial API and implementation
 *    Brad Reynolds - bug 116920
 *    Samy Abou-Shama - adapted for RAP and implemented Snippet as Control
 *    EclipseSource - ongoing development
 ******************************************************************************/
package org.eclipse.rap.demo.databinding;

import org.eclipse.core.databinding.DataBindingContext;
import org.eclipse.core.databinding.beans.BeansObservables;
import org.eclipse.core.databinding.observable.Realm;
import org.eclipse.jface.databinding.swt.SWTObservables;
import org.eclipse.rap.demo.databinding.nestedselection.ModelObject;
import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;

/**
 * Hello, databinding. Bind changes in a GUI to a Model object but don't worry
 * about propagating changes from the Model to the GUI.
 * <p>
 * Illustrates the basic Model-ViewModel-Binding-View architecture typically
 * used in data binding applications.
 */
public class Snippet000HelloWorld extends Group {
    private final ViewModel viewModel = new ViewModel();
    private Text name;
    private Label labelName;

    // The data model class. This is normally a persistent class of some sort.
    //
    // 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 extends ModelObject {

        // A property...
        String name = "HelloWorld";

        public String getName() {
            return name;
        }

        public void setName(final String name) {
            String oldValue = this.name;
            this.name = name;
            firePropertyChange("name", oldValue, this.name);
        }
    }

    // The View's model--the root of our Model graph for this particular GUI.
    //
    // Typically each View class has a corresponding ViewModel class.
    // The ViewModel is responsible for getting the objects to edit from the
    // DAO. Since this snippet doesn't have any persistent objects to
    // retrieve, this ViewModel just instantiates a model object to edit.
    static class ViewModel {

        // The model to bind
        private final Person person = new Person();

        public Person getPerson() {
            return person;
        }
    }

    public Snippet000HelloWorld(final Composite parent, final int style) {
        super(parent, style);
        createPartControl();
    }

    public void createPartControl() {
        FormLayout formLayout = new FormLayout();
        formLayout.marginHeight = DatabindingSnippetsView.GROUP_MARGIN_HEIGHT;
        formLayout.marginWidth = DatabindingSnippetsView.GROUP_MARGIN_WIDTH;
        setLayout(formLayout);
        setText("Hello World Snippet 0001 - Binding Example");
        // Info Label
        Label info1 = new Label(this, SWT.NONE);
        info1.setText("This Textbox is linked to the Model (Person/Name). "
                + "If you type in a text, it automatically updates " + "the name property of the model");
        FormData data = new FormData(DatabindingSnippetsView.UNDEFINDED, SWT.DEFAULT);
        data.top = new FormAttachment(0, DatabindingSnippetsView.TOP_MARGIN);
        data.left = new FormAttachment(0, 0);
        info1.setLayoutData(data);
        name = new Text(this, SWT.BORDER);
        data = new FormData(DatabindingSnippetsView.STD_TEXT_WIDTH_LARGE, SWT.DEFAULT);
        data.top = new FormAttachment(info1, DatabindingSnippetsView.TOP_MARGIN);
        data.left = new FormAttachment(0, 0);
        name.setLayoutData(data);
        Label info2 = new Label(this, SWT.NONE);
        info2.setText("This Label is also linked (readonly) to the Model." + " It gets updated on all changes");
        data = new FormData(DatabindingSnippetsView.UNDEFINDED, SWT.DEFAULT);
        data.top = new FormAttachment(name, DatabindingSnippetsView.TOP_MARGIN);
        data.left = new FormAttachment(0, 0);
        info2.setLayoutData(data);
        labelName = new Label(this, SWT.BORDER);
        data = new FormData(DatabindingSnippetsView.STD_TEXT_WIDTH_LARGE, SWT.DEFAULT);
        data.top = new FormAttachment(info2, DatabindingSnippetsView.TOP_MARGIN);
        data.left = new FormAttachment(0, 0);
        labelName.setLayoutData(data);
        labelName.setText("not changed yet...");

        Realm realm = SWTObservables.getRealm(Display.getCurrent());
        DataBindingContext bindingContext = new DataBindingContext(realm);
        Person person = viewModel.getPerson();
        bindingContext.bindValue(SWTObservables.observeText(name, SWT.Modify),
                BeansObservables.observeValue(realm, person, "name"), null, null);
        bindingContext.bindValue(SWTObservables.observeText(labelName),
                BeansObservables.observeValue(realm, person, "name"), null, null);
    }
}