/**
 * 
 */
package com.aelitis.azureus.ui.swt.skin;

import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.widgets.*;

/**
 * @author TuxPaper
 * @created Jun 8, 2006
 *
 */
public class SWTSkinImageChanger
	implements Listener
{
	private final String suffix;

	private final int eventOn;

	private final int eventOff;

	private Control lastControl;

	/**
	 * Default Constructor
	 * 
	 * @param suffix
	 * @param eventOff 
	 * @param eventOn 
	 */
	public SWTSkinImageChanger(String suffix, int eventOn, int eventOff) {
		this.suffix = suffix;
		this.eventOn = eventOn;
		this.eventOff = eventOff;
	}

	public void handleEvent(Event event) {
		Control control = (Control) event.widget;
		
		if (control == null) {
			return;
		}

		try {
			if (event.type == SWT.MouseExit && lastControl != null) {
				if (control.getParent() == lastControl) {
					return;
				}
			}

			SWTSkinObject skinObject = (SWTSkinObject) control.getData("SkinObject");

			if (event.type == SWT.MouseExit
					&& (skinObject instanceof SWTSkinObjectContainer)) {
				// check if exiting and going into child
				SWTSkinObjectContainer soContainer = (SWTSkinObjectContainer) skinObject;
				if (soContainer.getPropogation()) {
					Point pt = control.toDisplay(event.x, event.y);
					Composite composite = soContainer.getComposite();
					Point relPt = composite.toControl(pt);
					Rectangle bounds = composite.getBounds();
					if (relPt.x >= 0 && relPt.y >= 0 && relPt.x < bounds.width
							&& relPt.y < bounds.height) {
						//System.out.println("skip " + skinObject + " because going into child");
						return;
					}
				}
			}

			if (event.type == SWT.MouseExit) {
				// check if exiting and going into parent
				Composite parent = control.getParent();
				SWTSkinObject soParent = (SWTSkinObject) parent.getData("SkinObject");
				if (soParent != null && (soParent instanceof SWTSkinObjectContainer)) {
					SWTSkinObjectContainer container = (SWTSkinObjectContainer) soParent;
					if (container.getPropogation()) {
						Point pt = control.toDisplay(event.x, event.y);
						Point relPt = container.getComposite().toControl(pt);
						Rectangle bounds = parent.getBounds();
						if (relPt.x >= 0 && relPt.y >= 0 && relPt.x < bounds.width
								&& relPt.y < bounds.height) {
							//System.out.println("skip " + skinObject + " because going into parent");
							return;
						}
					}
				}
			}

			if (skinObject != null) {
				String sSuffix = (event.type == eventOn) ? suffix : "";
				//System.out.println(System.currentTimeMillis() + ": " + skinObject + "--" + sSuffix);

				skinObject.switchSuffix(sSuffix, 2, true);
			}
		} finally {
			lastControl = control;
		}
	}
}