org.eclipse.xwt.tools.ui.designer/src/org/eclipse/xwt/tools/ui/designer/databinding/ui/ObserveModelGroup.java

/*******************************************************************************
 * Copyright (c) 2006, 2010 Soyatec (http://www.soyatec.com) 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:
 *     Soyatec - initial API and implementation
 *******************************************************************************/
package org.eclipse.xwt.tools.ui.designer.databinding.ui;

import java.beans.PropertyChangeEvent;

import org.eclipse.gef.EditPart;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.TreeViewer;
import org.eclipse.xwt.tools.ui.designer.databinding.BindingContext;
import org.eclipse.xwt.tools.ui.designer.databinding.BindingHelper;
import org.eclipse.xwt.tools.ui.designer.databinding.DataContext;
import org.eclipse.xwt.tools.ui.designer.databinding.IObservable;
import org.eclipse.xwt.tools.ui.designer.databinding.Observable;
import org.eclipse.xwt.tools.ui.designer.databinding.ObservableUtil;
import org.eclipse.xwt.tools.ui.designer.databinding.Property;
import org.eclipse.xwt.tools.ui.designer.parts.ViewerEditPart;
import org.eclipse.xwt.tools.ui.designer.parts.WidgetEditPart;

/**
 * @author jliu (jin.liu@soyatec.com)
 */
public class ObserveModelGroup extends ObserveGroup {

	public ObserveModelGroup(BindingContext bindingContext, EditPart rootEditPart) {
		super(bindingContext, rootEditPart);
	}

	protected String computeMessage() {
		String message = "Model:";
		BindingContext bc = getBindingContext();
		IObservable model = bc.getModel();
		Property modelProperty = bc.getModelProperty();
		if (model != null) {
			message += model.getDisplayName();
			if (modelProperty != null) {
				message += "." + modelProperty;
			}
		} else {
			message += "<empty>";
		}
		return message;
	}

	protected void handleSelection(IStructuredSelection selection) {
		Object element = selection.getFirstElement();
		BindingContext bindingContext = getBindingContext();
		if (element == null) {
			bindingContext.setModel(null);
			bindingContext.setModelProperty(null);
		} else if (element instanceof IObservable) {
			bindingContext.setModel((IObservable) element);
			bindingContext.setModelProperty(null);
		} else if (element instanceof Property) {
			bindingContext.setModelProperty((Property) element);
		}
	}

	protected void selectAndReveal(PropertyChangeEvent evt) {
		Object newValue = evt.getNewValue();
		if ("model".equals(evt.getPropertyName())) {
			TreeViewer treeViewer = observableList.getTreeViewer();
			treeViewer.setSelection(createSelection(newValue), true);
		} else if ("modelProperty".equals(evt.getPropertyName())) {
			propertiesTree.setSelection(createSelection(newValue), true);
		}
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.xwt.tools.ui.designer.databinding.ui.ObserveGroup#computeObservables(org.eclipse.gef.EditPart)
	 */
	protected IObservable[] computeObservables(EditPart rootEditPart) {
		if (rootEditPart == null) {
			return new IObservable[0];
		}
		Object root = null;
		if (rootEditPart instanceof WidgetEditPart) {
			root = ((WidgetEditPart) rootEditPart).getWidget();
		} else if (rootEditPart instanceof ViewerEditPart) {
			root = ((ViewerEditPart) rootEditPart).getViewer();
		}
		if (root == null) {
			return new IObservable[0];
		}
		DataContext dataContext = BindingHelper.getDataContext(root);
		Observable widgets = ObservableUtil.getObservable(root);
		if (dataContext == null) {
			return new IObservable[] { widgets };
		}
		IObservable[] models = new IObservable[2];
		models[0] = widgets;
		models[1] = ObservableUtil.getObservable(dataContext);
		return models;
	}

}