BehaviorSection.java

package org.csstudio.sds.ui.internal.editor.newproperties;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import org.csstudio.sds.SdsPlugin;
import org.csstudio.sds.internal.eventhandling.BehaviorDescriptor;
import org.csstudio.sds.internal.eventhandling.IBehaviorDescription;
import org.csstudio.sds.internal.eventhandling.IBehaviorService;
import org.csstudio.sds.internal.model.BehaviorProperty;
import org.eclipse.jface.viewers.ArrayContentProvider;
import org.eclipse.jface.viewers.ComboViewer;
import org.eclipse.jface.viewers.ISelectionChangedListener;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.LabelProvider;
import org.eclipse.jface.viewers.SelectionChangedEvent;
import org.eclipse.jface.viewers.StructuredSelection;
import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.CCombo;
import org.eclipse.swt.layout.FormAttachment;
import org.eclipse.swt.layout.FormData;
import org.eclipse.swt.layout.FormLayout;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.ui.views.properties.tabbed.TabbedPropertySheetPage;

/**
 * Section for {@link BehaviorProperty}.
 * 
 * @author Sven Wende
 * 
 */
public class BehaviorSection extends AbstractBaseSection<BehaviorProperty> {

	private ComboViewer optionViewer;
	private ISelectionChangedListener changeListener;

	public BehaviorSection(String propertyId) {
		super(propertyId);
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	protected void doCreateControls(Composite parent,
			TabbedPropertySheetPage tabbedPropertySheetPage) {
		parent.setLayout(new FormLayout());

		// .. create a combo and the corresponding viewer
		CCombo combo = getWidgetFactory().createCCombo(parent,
				SWT.BORDER | SWT.READ_ONLY);
		FormData fd = new FormData();
		fd.left = new FormAttachment(0, 0);
		fd.right = new FormAttachment(50, 0);
		combo.setLayoutData(fd);

		optionViewer = new ComboViewer(combo);
		optionViewer.setLabelProvider(new BehaviorDescriptionLabelProvider());
		optionViewer.setContentProvider(new ArrayContentProvider());

		// .. listen to changes
		changeListener = new ISelectionChangedListener() {
			@Override
			public void selectionChanged(SelectionChangedEvent event) {
				IBehaviorDescription behaviorDescription = (IBehaviorDescription) ((IStructuredSelection) optionViewer
						.getSelection()).getFirstElement();

				if (behaviorDescription != null) {
					applyPropertyChange(behaviorDescription.getBehaviorId());
				} else {
					applyPropertyChange("");
				}
			}
		};
		optionViewer.addSelectionChangedListener(changeListener);
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	protected void doRefreshControls(BehaviorProperty widgetProperty) {
		// .. update the combobox
		if (optionViewer.getContentProvider() != null) {
			List<BehaviorDescriptor> behaviorDescriptors = getBehaviorDescriptors();

			optionViewer.setInput(behaviorDescriptors);

			// .. select the current behavior
			BehaviorDescriptor selectedBehavior = behaviorDescriptors.get(0);

			String currentBehaviorId = widgetProperty.getPropertyValue();
			if (currentBehaviorId != null) {
				for (BehaviorDescriptor d : behaviorDescriptors) {
					if (currentBehaviorId.equals(d.getBehaviorId())) {
						selectedBehavior = d;
						break;
					}
				}
			}

			assert selectedBehavior != null;

			optionViewer.removeSelectionChangedListener(changeListener);
			optionViewer
					.setSelection(new StructuredSelection(selectedBehavior));
			optionViewer.addSelectionChangedListener(changeListener);

		}
	}

	@SuppressWarnings("unchecked")
	private List<BehaviorDescriptor> getBehaviorDescriptors() {
		List<BehaviorDescriptor> result = new ArrayList<BehaviorDescriptor>();

		// .. add empty
		BehaviorDescriptor noneDescriptor = new BehaviorDescriptor("none", "*",
				"None", Collections.EMPTY_SET, null);
		result.add(noneDescriptor);

		// .. add real behaviors
		if (selectedWidget != null) {
			IBehaviorService service = SdsPlugin.getDefault()
					.getBehaviourService();
			result.addAll(service.getBehaviors(selectedWidget.getTypeID()));
		}
		return result;
	}

	/**
	 * Label provider for {@link IBehaviorDescription}.
	 * 
	 * @author Sven Wende
	 * 
	 */
	private static final class BehaviorDescriptionLabelProvider extends
			LabelProvider {
		@Override
		public String getText(Object element) {
			BehaviorDescriptor d = (BehaviorDescriptor) element;
			return d.getDescription();
		}
	}

}