/*******************************************************************************
 * Copyright (c) 2010 Standards for Technology in Automotive Retail 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:
 *     David Carver - initial API and implementation
 *******************************************************************************/

package org.eclipse.wst.xml.ui.internal.views.contentmodel;

import org.eclipse.core.commands.Command;
import org.eclipse.core.commands.State;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.TreeViewer;
import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Tree;
import org.eclipse.ui.IEditorPart;
import org.eclipse.ui.IMemento;
import org.eclipse.ui.ISelectionListener;
import org.eclipse.ui.IViewSite;
import org.eclipse.ui.IWorkbenchPart;
import org.eclipse.ui.PartInitException;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.commands.ICommandService;
import org.eclipse.ui.model.BaseWorkbenchContentProvider;
import org.eclipse.ui.model.WorkbenchLabelProvider;
import org.eclipse.ui.part.ViewPart;
import org.w3c.dom.Element;


public class ContentModelView extends ViewPart implements ISelectionListener {
	private TreeViewer tv;

	public void init(IViewSite site, IMemento memento) throws PartInitException {
		super.init(site, memento);
		getSite().getPage().addPostSelectionListener(this);
	}

	public void dispose() {
		getSite().getPage().removePostSelectionListener(this);
		super.dispose();
	}

	public void createPartControl(Composite parent) {
		Tree tree = new Tree(parent, SWT.NONE);
		tv = new TreeViewer(tree);
		tv.setContentProvider(new BaseWorkbenchContentProvider());
		tv.setLabelProvider(new WorkbenchLabelProvider());
	}

	public void setFocus() {

	}


	private IStructuredSelection currentSelection;

	public void selectionChanged(IWorkbenchPart part, ISelection selection) {

		IEditorPart edPart = getSite().getPage().getActiveEditor();
		if (part.equals(edPart)) {
			if (selection instanceof IStructuredSelection) {
				currentSelection = (IStructuredSelection) selection;
				if (!selection.isEmpty()
						&& (currentSelection.getFirstElement() instanceof Element)) {
					if (isLinkedWithEditor() && !currentSelection.getFirstElement().equals(tv.getInput())) {
						tv.setInput(currentSelection.getFirstElement());
					} 
				}
			}
		}

	}

	private boolean isLinkedWithEditor() {
		ICommandService service = (ICommandService) PlatformUI.getWorkbench()
				.getService(ICommandService.class);
		Command command = service.getCommand("org.eclipse.wst.xml.ui.cmnd.contentmodel.sych"); //$NON-NLS-1$
		State state = command.getState("org.eclipse.ui.commands.toggleState"); //$NON-NLS-1$

		return ((Boolean) state.getValue()).booleanValue();
	}

}