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

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Here is the source code for org.eclipse.e4.demo.viewer.PropertiesSash.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.UpdateValueStrategy;
import org.eclipse.core.databinding.observable.value.IObservableValue;
import org.eclipse.e4.ui.model.application.MApplicationPackage;
import org.eclipse.emf.common.util.BasicEList;
import org.eclipse.emf.common.util.EList;
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.swt.SWT;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Text;

/**
 * Basic information for the MStack 
 */
public class PropertiesSash extends PropertiesElement {

    private Text policy;
    private Text weights;
    private Binding weightsBinding;
    private Button visible;
    private Binding visibleBinding;

    public PropertiesSash(final Composite parent) {
        super(parent);
        policy = createTextControl(comp, "&Policy:", SWT.READ_ONLY);
        weights = createTextControl(comp, "&Weights:", SWT.NONE);
        visible = createButton(comp, "&Visible", SWT.NONE);
        GridData checkboxData = new GridData(SWT.RIGHT, SWT.TOP, false, false, 2, 1);
        visible.setLayoutData(checkboxData);
    }

    public void selected(EObject selected) {
        super.selected(selected);
        weightsBinding = bindList(weights, MApplicationPackage.Literals.GENERIC_TILE__WEIGHTS);
        visibleBinding = bind(visible, MApplicationPackage.Literals.UI_ELEMENT__VISIBLE);
    }

    protected Binding bindList(Text text, EStructuralFeature feature) {
        IObservableValue observable = EMFObservables.observeValue(selectedObject, feature);
        // NOTE: Do not use SWT.Modify as it might cause StackOverflow
        // when stack is dragged
        return dbc.bindValue(SWTObservables.observeText(text, SWT.FocusOut), observable, new UpdateValueStrategy() { // Text to EMF model
            @Override
            public Object convert(Object value) {
                if (!(value instanceof String))
                    return super.convert(value);

                String[] parts = ((String) value).split(", ");
                EList<Integer> emfList = new BasicEList<Integer>(parts.length);
                for (String part : parts) {
                    try {
                        emfList.add(Integer.decode(part));
                    } catch (NumberFormatException e) {
                        // can't process; pass to superclass
                        return super.convert(value);
                    }
                }
                return emfList;
            }
        }, new UpdateValueStrategy() { // EMF model to Text
            @Override
            public Object convert(Object value) {
                if (!(value instanceof EList<?>))
                    return super.convert(value);
                StringBuffer result = new StringBuffer();
                for (Object element : (EList<?>) value) {
                    if (result.length() != 0)
                        result.append(", ");
                    result.append(element.toString());
                }
                return result.toString();
            }
        });
    }

    protected void clearBindings() {
        super.clearBindings();
        if (weightsBinding != null) {
            weightsBinding.dispose();
            weightsBinding = null;
        }
        if (visibleBinding != null) {
            visibleBinding.dispose();
            visibleBinding = null;
        }
    }
}