/*******************************************************************************
 * Copyright (c) 2004-2008 Istvan Rath and Daniel Varro
 * 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:
 *    Istvan Rath - initial API and implementation
 *******************************************************************************/

 package org.eclipse.viatra2.treeeditor.providers;


import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.TreeEditor;
import org.eclipse.swt.events.FocusEvent;
import org.eclipse.swt.events.FocusListener;
import org.eclipse.swt.events.KeyEvent;
import org.eclipse.swt.events.KeyListener;
import org.eclipse.swt.events.ModifyEvent;
import org.eclipse.swt.events.ModifyListener;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Text;
import org.eclipse.viatra2.core.IModelElement;
import org.eclipse.viatra2.treeeditor.ViatraTreeEditor;
import org.eclipse.viatra2.treeeditor.commands.ChangeElementNameCommand;
import org.eclipse.viatra2.treeeditor.commands.ChangePropertyCommand;
import org.eclipse.viatra2.treeeditor.properties.VPMProperties;

public class ViatraTreeEventListener implements ModifyListener, FocusListener,
		KeyListener {

	/**
	 * Reference to the cell editor for the Tree widget.
	 */
	protected TreeEditor iEditor;
	
	protected IModelElement iME;
	
	protected ViatraTreeEditor iVTE;
	
	public ViatraTreeEventListener(IModelElement me, TreeEditor te, ViatraTreeEditor vte) {
		iEditor = te;
		iME = me;
		iVTE = vte;
	}
	
	
	public void modifyText(ModifyEvent e) {
		// don't care

	}

	public void focusGained(FocusEvent e) {
		// don't care
	}

	public void focusLost(FocusEvent e) {
		cancelEditing();
	}

	public void keyPressed(KeyEvent e) {
		if (e.keyCode == SWT.ESC)
			cancelEditing();
		else if (e.keyCode == SWT.CR || e.keyCode == SWT.KEYPAD_CR)
			submitEditing();
	}

	public void keyReleased(KeyEvent e) {
		// don't care
	}

	/**
	 * Cancels the editing of the tree item.
	 */
	public void cancelEditing() {
		Control ctrl = iEditor.getEditor();
		if (ctrl != null && !ctrl.isDisposed()) {
			ctrl.removeFocusListener(this);
			ctrl.removeKeyListener(this);
			((Text) ctrl).removeModifyListener(this);
			ctrl.dispose();
		}
		iEditor.dispose();
	}
	
	/**
	 * Submits the editing of the tree item.
	 */
	public void submitEditing() {
		String text = ((Text)iEditor.getEditor()).getText();
		String name = "";
		String value = "";
		int braceStart = text.indexOf('{');
		int braceEnd = text.indexOf('}');
		if (braceStart>-1 && braceEnd>braceStart) {
			value = text.substring(braceStart+1, braceEnd);
			name = text.replaceAll(value, "");
			name = name.replaceAll("\\{\\}", "").trim();
		}
		else {
			name = text;
		}
		ChangeElementNameCommand cmd = new ChangeElementNameCommand();
		cmd.setTargetElem(iME);
		cmd.setNewElemName(name);
		iVTE.getCommandStack().execute(cmd);
		if (value.length()>0) {
			ChangePropertyCommand c1 = new ChangePropertyCommand();
			c1.setKind(VPMProperties.VALUE);
			c1.setNewValue(value);
			c1.setTarget(iME);
			iVTE.getCommandStack().execute(c1);
		}
		cancelEditing();
	}
	
}