org.gumtree.gumnix.sics.batch.ui.views.SicsVariableView.java Source code

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Here is the source code for org.gumtree.gumnix.sics.batch.ui.views.SicsVariableView.java

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/*****************************************************************************
 * Copyright (c) 2007 Australian Nuclear Science and Technology Organisation.
 * 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:
 *     Tony Lam (Bragg Institute) - initial API and implementation
 *****************************************************************************/

package org.gumtree.gumnix.sics.batch.ui.views;

import org.eclipse.core.databinding.DataBindingContext;
import org.eclipse.core.databinding.UpdateValueStrategy;
import org.eclipse.core.databinding.beans.BeansObservables;
import org.eclipse.core.databinding.observable.Realm;
import org.eclipse.jface.databinding.swt.SWTObservables;
import org.eclipse.jface.fieldassist.ControlDecoration;
import org.eclipse.jface.fieldassist.FieldDecoration;
import org.eclipse.jface.fieldassist.FieldDecorationRegistry;
import org.eclipse.jface.layout.GridDataFactory;
import org.eclipse.jface.layout.GridLayoutFactory;
import org.eclipse.jface.viewers.ArrayContentProvider;
import org.eclipse.jface.viewers.ComboViewer;
import org.eclipse.jface.viewers.LabelProvider;
import org.eclipse.jface.viewers.StructuredSelection;
import org.eclipse.jface.viewers.ViewerSorter;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.ModifyEvent;
import org.eclipse.swt.events.ModifyListener;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Text;
import org.gumtree.gumnix.sics.batch.ui.commands.SicsVariableCommand;
import org.gumtree.gumnix.sics.batch.ui.util.SicsBatchUIUtils;

public class SicsVariableView extends AbstractSicsCommandView<SicsVariableCommand> {

    private DataBindingContext bindingContext;

    private ComboViewer comboViewer;

    private Text text;

    @Override
    public void createPartControl(Composite parent, SicsVariableCommand command) {
        GridLayoutFactory.fillDefaults().margins(0, 0).spacing(10, SWT.DEFAULT).numColumns(2).applyTo(parent);

        /*********************************************************************
         * Sics variable selection
         *********************************************************************/
        final String[] sicsVariables = SicsBatchUIUtils.getSicsVariables();
        comboViewer = new ComboViewer(parent, SWT.READ_ONLY);
        comboViewer.setContentProvider(new ArrayContentProvider());
        comboViewer.setLabelProvider(new LabelProvider());
        comboViewer.setInput(sicsVariables);
        comboViewer.setSorter(new ViewerSorter());
        comboViewer.getCombo().setVisibleItemCount(20);
        GridDataFactory.swtDefaults().hint(WIDTH_COMBO, SWT.DEFAULT).indent(0, 2).applyTo(comboViewer.getCombo());

        /*********************************************************************
         * Argument
         *********************************************************************/
        text = getToolkit().createText(parent, "", SWT.BORDER);
        text.setToolTipText("Enter sics variable argument");
        GridDataFactory.fillDefaults().indent(0, 2).grab(true, false).applyTo(text);
        // Check empty field
        final ControlDecoration controlDec = new ControlDecoration(text, SWT.LEFT | SWT.BOTTOM);
        final FieldDecoration fieldDec = FieldDecorationRegistry.getDefault()
                .getFieldDecoration(FieldDecorationRegistry.DEC_ERROR);
        text.addModifyListener(new ModifyListener() {
            public void modifyText(ModifyEvent e) {
                if ((text.getText() == null) || text.getText().length() == 0) {
                    controlDec.setImage(fieldDec.getImage());
                    controlDec.setDescriptionText("SICS variable argument is empty");
                    controlDec.show();
                } else {
                    controlDec.hide();
                }
            }
        });

        /*********************************************************************
         * Data binding
         *********************************************************************/
        Realm.runWithDefault(SWTObservables.getRealm(Display.getDefault()), new Runnable() {
            public void run() {
                bindingContext = new DataBindingContext();

                bindingContext.bindValue(SWTObservables.observeSelection(comboViewer.getCombo()),
                        BeansObservables.observeValue(getCommand(), "sicsVariable"), new UpdateValueStrategy(),
                        new UpdateValueStrategy());

                bindingContext.bindValue(SWTObservables.observeText(text, SWT.Modify),
                        BeansObservables.observeValue(getCommand(), "value"), new UpdateValueStrategy(),
                        new UpdateValueStrategy());

                // Set Default selection (only works after the binding is set)
                if (getCommand().getSicsVariable() == null) {
                    if (comboViewer.getCombo().getItemCount() > 0) {
                        comboViewer.setSelection(new StructuredSelection(
                                comboViewer.getCombo().getItem(comboViewer.getCombo().getItemCount() - 1)));
                    }
                }
            }
        });
    }

    @Override
    public void dispose() {
        if (bindingContext != null) {
            bindingContext.dispose();
            bindingContext = null;
        }
        comboViewer = null;
        text = null;
        super.dispose();
    }

}