package java.awt;

import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;

/**
 * CheckboxMenuItem
 *
 * Copyright (c) 1998
 *   Transvirtual Technologies Inc., BISS GmbH.  All rights reserved.
 *
 * See the file "license.terms" for information on usage and redistribution
 * of this file.
 * @author J.H.Mehlitz
 */
public class CheckboxMenuItem
  extends MenuItem
  implements ItemSelectable
{
	boolean isChecked;
	ItemListener iListener;

public CheckboxMenuItem () {
	this( "", false);
}

public CheckboxMenuItem ( String label ) {
	this( label, false);
}

public CheckboxMenuItem ( String label, boolean isChecked ) {
	super( label);

	this.isChecked = isChecked;
}

public void addItemListener( ItemListener newListener) {
	iListener = AWTEventMulticaster.add( iListener, newListener);
}

public Object[] getSelectedObjects () {
	// ItemSelectable interface
	
	if ( isChecked ) {
		Object[] selItems = new Object[1];
		selItems[0] = getLabel();
		return selItems;
	}
	else
		return null;
}

public boolean getState () {
	return isChecked;
}

int getWidth() {
	int sw = super.getWidth();
	sw += 3*getHeight()/4;
	return sw;
}

int paint ( Graphics g, int xoff, int y, int width, Color back, Color fore, boolean sel) {
	int cm = getHeight();
	g.setColor( isChecked ? Defaults.FocusClr : Defaults.BtnClr);
	g.fill3DRect( xoff, y + cm/4, cm/2, cm/2, !isChecked);
	xoff += 3*cm/4;

	return super.paint( g, xoff, y, width, back, fore, sel);
}

public String paramString() {
	return super.paramString() + ", " + (isChecked ? "checked" : "unchecked");
}

void process() {
	setState( !isChecked );
	if ( hasToNotify( iListener) ) {
		ItemEvent ie = AWTEvent.getItemEvent( this, ItemEvent.ITEM_STATE_CHANGED );
		ie.setItemEvent( getLabel(), isChecked ? ItemEvent.SELECTED : ItemEvent.DESELECTED );
		Toolkit.eventQueue.postEvent( ie);
	}
}

protected void processItemEvent ( ItemEvent ie ) {
	if ( hasToNotify( iListener) )
		iListener.itemStateChanged( ie);
}

public void removeItemListener ( ItemListener listener ) {
	iListener = AWTEventMulticaster.remove( iListener, listener);
}

public synchronized void setState ( boolean isChecked ) {
	this.isChecked = isChecked;
}
}