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/*******************************************************************************
 * Copyright (c) 2003, 2007 s IT Solutions AT Spardat GmbH .
 * 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:
 *     s IT Solutions AT Spardat GmbH - initial API and implementation
 *******************************************************************************/

// @(#) $Id: DNodeInspector.java 2089 2007-11-28 13:56:13Z s3460 $
package at.spardat.xma.mdl.util;

import java.util.Iterator;

import org.eclipse.swt.SWT;
import org.eclipse.swt.events.ShellAdapter;
import org.eclipse.swt.events.ShellEvent;
import org.eclipse.swt.layout.FormAttachment;
import org.eclipse.swt.layout.FormData;
import org.eclipse.swt.layout.FormLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Tree;
import org.eclipse.swt.widgets.TreeItem;
import org.eclipse.swt.widgets.Widget;

/**
 * Opens a SWT window to show a hierarchy of DNodes.
 * 
 * @author YSD, 03.05.2003 14:18:25
 */
public class DNodeInspector {
    
    /**
     * Constructor. Does not show. Use show to show.
     * 
     * @param rootNode
     */
    public DNodeInspector (DNode rootNode) {
        root_ = rootNode;
    }
    
    /**
     * Opens a non modal shell to show the hierachy.
     */
    public void show () {
        boolean myDisplay = false;
        Display display = Display.getCurrent();
        if (display == null) {
            display = new Display();
            myDisplay = true;
        }
             
        Shell shell = new Shell (display, SWT.MODELESS | SWT.SHELL_TRIM);
        FormLayout layout= new FormLayout ();
        layout.marginHeight = 5;
        layout.marginWidth = 5;
        shell.setLayout (layout);
        
        Tree t = new Tree(shell, SWT.BORDER | SWT.H_SCROLL | SWT.V_SCROLL);
        FormData formData = new FormData(800, 400);
        formData.top = new FormAttachment (0, 0);
        formData.left = new FormAttachment (0, 0);
        formData.right = new FormAttachment (100, 0);
        formData.bottom = new FormAttachment (100, 0);
        t.setLayoutData(formData);

        recursivelyAddNodes (t, root_);
        shell.addShellListener(new ShellAdapter() {
            public void shellClosed(ShellEvent e) {
                if (e.widget instanceof Shell) {
                    Shell s = (Shell)e.widget;
                    if (!s.isDisposed()) s.dispose();
                }
            }
        });
        
        // show 
        shell.pack();
        shell.open();
        
        if (myDisplay) {
            while (!shell.isDisposed()) {
               if (!display.readAndDispatch()) display.sleep();
            }
            display.dispose();
        }
    }

    // builds the tree
    private void recursivelyAddNodes (Widget parent, DNode dNode) {
        TreeItem            ti;
        if (parent instanceof Tree) {
            ti = new TreeItem ((Tree)parent, SWT.NULL);
        } else {
            ti = new TreeItem ((TreeItem)parent, SWT.NULL);
        }
        ti.setText(dNode.getText());
        // add sons of this
        Iterator iter = dNode.getSons();
        while (iter != null && iter.hasNext()) {
            DNode son = (DNode) iter.next();
            recursivelyAddNodes (ti, son);
        }
        ti.setExpanded(true);
    }
    

    
    // the root node
    private DNode           root_;
}