package de.mpg.mpiwg.itgroup.digilib.manipulator.extensions;


import org.eclipse.swt.SWT;
import org.eclipse.swt.events.MouseEvent;
import org.eclipse.swt.events.MouseListener;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.widgets.Label;

import de.mpg.mpiwg.itgroup.digilib.digiImage.DigiImageController;
import de.mpg.mpiwg.itgroup.digilib.plugin.editors.DigilibLinkEditorObservable;

/**
 * Listener to select the zoom area for the zoomarea function on digiimage.
 * calls zoom area after an area on the image was selected.
 * @author dwinter
 *
 */
public class ZoomAreaRectangleListener implements MouseListener {
	static int FIRST_CLICK=1;
	static int SECOND_CLICK=2;
	static int NO_CLICK=0;
	int status=NO_CLICK;
	private Label label;
	private Point firstPoint;
	private DigiImageController dc;
	
	
	private ZoomAreaRectangleListener() {};
	
	public ZoomAreaRectangleListener(DigiImageController dc){
		this.label = dc.digiImage.getLabel();
		this.dc=dc;
	}
	public void reset(){
		status=0;
	}
	public void mouseDoubleClick(MouseEvent e) {
		// TODO Auto-generated method stub

	}

	public void mouseDown(MouseEvent e) {
		// TODO Auto-generated method stub

	}

	public void mouseUp(MouseEvent e) {
		if (status==NO_CLICK){
			handleFirstClick(e);
		} else if (status==FIRST_CLICK){
			handleSecondClick(e);
		}

	}

	private void handleSecondClick(MouseEvent e) {
		//Canvas canvas = new Canvas(label.getParent(),SWT.NO_BACKGROUND);

		GC gc = new GC(label.getImage());
		
		gc.setForeground(new Color(label.getDisplay(),255,0,0));
		
		gc.drawRectangle(firstPoint.x, firstPoint.y, e.x-firstPoint.x, e.y-firstPoint.y);
		gc.dispose();
		label.redraw();
		status=SECOND_CLICK;
		dc.zoomArea(firstPoint.x,firstPoint.y,e.x,e.y);
		dc.digiImage.getLabel().removeMouseListener(this);
		DigilibLinkEditorObservable.INSTANCE.setCursorStatus(SWT.CURSOR_ARROW);
		//DigilibLinkEditorObservable.INSTANCE.imageHasChanged(dc.digiImage);
		
	}

	private void handleFirstClick(MouseEvent e) {
		//Canvas canvas = new Canvas(label.getParent(),SWT.NO_BACKGROUND);

		GC gc = new GC(label.getImage());
		
		gc.setForeground(new Color(label.getDisplay(),255,0,0));
		firstPoint = new Point(e.x,e.y);
		gc.drawOval(e.x, e.y, 10, 10);
		gc.dispose();
		status=FIRST_CLICK;
		label.redraw();
		DigilibLinkEditorObservable.INSTANCE.setCursorStatus(SWT.CURSOR_CROSS);
	}

	
}