/*******************************************************************************
 * Copyright (c) 2007, 2010 Association for Decentralized Information Management
 * in Industry THTH ry.
 * 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:
 *     VTT Technical Research Centre of Finland - initial API and implementation
 *******************************************************************************/
package org.simantics.diagram.ui;

import java.awt.geom.Point2D;

import org.eclipse.swt.SWT;
import org.eclipse.swt.events.MenuEvent;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Menu;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.ui.IWorkbenchPartSite;
import org.simantics.g2d.diagram.DiagramHints;

/**
 * This is a SWTPopupMenu implementation with workaround for SWT popup menus that do not work when overlaid top of AWT widgets in Linux/GTK 
 * 
 * @see https://bugs.eclipse.org/bugs/show_bug.cgi?id=392101
 * 
 * 
 * @author Marko Luukkainen
 *
 */
public class SWTPopupMenuParticipantAwt extends SWTPopupMenuParticipant {

	Shell shell;
	Menu menu;
	
    public SWTPopupMenuParticipantAwt(IWorkbenchPartSite site, Control control, Display display, String menuId) {
		super(site, control, display, menuId);
	}
    
    @Override
    protected void runDispose() {
    	if (shell != null) {
    		shell.dispose();
    		shell = null;
    	}
    		
    	super.runDispose();
    }
    

    @Override
    protected void createControl() {
    	if(shell == null) {
    	    shell = new Shell(control.getShell(),SWT.NO_TRIM|SWT.NO_FOCUS|SWT.ON_TOP);
    	    shell.setSize(4, 4);
    	    shell.setVisible(false);
    	}
    	menuManager = createPopupMenu();
        if (menuManager != null) {
        	menu = menuManager.createContextMenu(shell);
            menu.addMenuListener(menuListener);
            shell.setMenu(menu);
            if (site != null) {
                site.registerContextMenu(menuManager.getId(), menuManager, wbsp);
            }
        }
    }
    
    @Override
    protected void menuHidden(MenuEvent e) {
    	if (shell != null)
    		shell.setVisible(false);
    	super.menuHidden(e);
    }
    
	/**
     * @param newValue
     * @thread canvas-thread (AWT)
     */
    protected void showPopup(Point2D newValue) {
    	final Point2D cp = (Point2D) newValue;
        setHint(DiagramHints.POPUP_MENU_CONTROL_POSITION, cp);
        setHint(DiagramHints.POPUP_MENU_CANVAS_POSITION, trUtil.controlToCanvas(cp, null));
        display.asyncExec(new Runnable() {
            @Override
            public void run() {
            	 
            	if (control == null || control.isDisposed())
                    return;
                final Point p = control.toDisplay((int) cp.getX(), (int) cp.getY());
          				  
          	    shell.getDisplay().asyncExec(new Runnable() {
          	      public void run() {
	          		shell.setLocation(p.x-1, p.y-1);
	          		shell.setActive();
	          		shell.setVisible(true);
          	      }});
          	    shell.getDisplay().asyncExec(new Runnable() {
          	      public void run() {
          	    	menuManager.getMenu().setLocation(p);
                    menuManager.getMenu().setVisible(true);
          	      }});

            }
        });
    }

}