org.eclipse.e4.demo.viewer.PropertiesElement.java Source code

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Here is the source code for org.eclipse.e4.demo.viewer.PropertiesElement.java

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/*******************************************************************************
 * Copyright (c) 2009 IBM Corporation 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:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.e4.demo.viewer;

import org.eclipse.core.databinding.Binding;
import org.eclipse.core.databinding.DataBindingContext;
import org.eclipse.core.databinding.observable.value.IObservableValue;
import org.eclipse.e4.ui.model.application.MApplicationPackage;
import org.eclipse.emf.databinding.EMFObservables;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.EStructuralFeature;
import org.eclipse.jface.databinding.swt.SWTObservables;
import org.eclipse.jface.layout.GridLayoutFactory;
import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Text;
import org.eclipse.ui.forms.widgets.FormToolkit;
import org.eclipse.ui.forms.widgets.ScrolledForm;
import org.eclipse.ui.forms.widgets.Section;

/**
 * Basic control for model items 
 */
public class PropertiesElement extends Composite {

    protected EObject selectedObject;

    protected DataBindingContext dbc;

    private Text id;
    private Binding idBinding;

    protected FormToolkit toolkit;
    protected ScrolledForm form;
    protected Section right;

    protected Composite comp;

    public PropertiesElement(final Composite parent) {
        super(parent, SWT.NONE);

        toolkit = new FormToolkit(parent.getDisplay());
        form = toolkit.createScrolledForm(this);
        form.setLayoutData(new GridData(GridData.FILL_BOTH | GridData.GRAB_HORIZONTAL | GridData.GRAB_VERTICAL));
        form.getBody().setLayout(new GridLayout());

        right = toolkit.createSection(form.getBody(), Section.TITLE_BAR | Section.EXPANDED);
        right.setText("Properties");
        right.setLayoutData(new GridData(GridData.FILL_BOTH | GridData.GRAB_HORIZONTAL));

        comp = toolkit.createComposite(right);
        comp.setLayout(new GridLayout(2, false));
        comp.setLayoutData(new GridData(GridData.FILL_BOTH | GridData.GRAB_HORIZONTAL | GridData.GRAB_VERTICAL));
        right.setClient(comp);

        dbc = new DataBindingContext();

        id = createTextControl(comp, "&ID:", SWT.NONE);

        GridLayoutFactory.fillDefaults().generateLayout(this);
    }

    /**
     * Passing the focus request to the form.
     */
    public boolean setFocus() {
        boolean result = super.setFocus();
        form.setFocus();
        return result;
    }

    protected Text createTextControl(Composite parent, String labelText, int style) {

        Label label = toolkit.createLabel(parent, labelText);
        label.setLayoutData(new GridData());
        Text result = toolkit.createText(parent, "", style);
        result.setLayoutData(new GridData(GridData.FILL_HORIZONTAL | GridData.GRAB_HORIZONTAL));
        return result;
    }

    protected Button createButton(Composite parent, String labelText, int style) {
        Button result = toolkit.createButton(parent, labelText, SWT.CHECK | style);
        return result;
    }

    protected Binding bind(Text text, EStructuralFeature feature) {
        if (selectedObject == null)
            return null;
        IObservableValue observable = EMFObservables.observeValue(selectedObject, feature);
        return dbc.bindValue(SWTObservables.observeText(text, SWT.Modify), observable, null, null);
    }

    protected Binding bind(Button button, EStructuralFeature feature) {
        if (selectedObject == null)
            return null;
        IObservableValue observable = EMFObservables.observeValue(selectedObject, feature);
        return dbc.bindValue(SWTObservables.observeSelection(button), observable, null, null);
    }

    public void selected(EObject selected) {
        if (selected == selectedObject)
            return;
        clearBindings();
        selectedObject = selected;

        idBinding = bind(id, MApplicationPackage.Literals.APPLICATION_ELEMENT__ID);
    }

    protected void clearBindings() {
        if (idBinding != null) {
            idBinding.dispose();
            idBinding = null;
        }
    }

    public void dispose() {
        clearBindings();
        toolkit.dispose();
    }

}