Model.java

/*
 * Model.java
 *
 * Created on July 17, 2002, 4:00 PM
 */

package org.reldb.dbrowser.ui.content.rev;

import java.util.Collection;
import java.util.HashSet;

import org.eclipse.swt.SWT;
import org.eclipse.swt.events.MouseEvent;
import org.eclipse.swt.events.MouseMoveListener;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Menu;
import org.reldb.dbrowser.ui.RevDatabase;

/**
 * Defines a layered pane in which visualised classes may be manipulated.
 *
 * @author  Dave Voorhis
 */
public class Model extends Composite {
    
	private int lastMouseX;
	private int lastMouseY;
	
	private Rev rev;
	
	private String modelName;
	
    /** Ctor */
    public Model(Rev rev, String modelName, Composite parent) {
    	super(parent, SWT.NONE);
    	
    	this.rev = rev;
    	this.modelName = modelName;
    	
    	addMouseMoveListener(new MouseMoveListener() {
			@Override
			public void mouseMove(MouseEvent e) {
				lastMouseX = e.x;
				lastMouseY = e.y;
				enablePopupMenu();
			}
    	});
    }

    private Menu preservedPopupMenu;
    
    void disablePopupMenu() {
    	if (getMenu() == null)
    		return;
    	preservedPopupMenu = getMenu();
    	setMenu(null);
    }
    
    void enablePopupMenu() {
    	if (getMenu() != null)
    		return;
    	if (preservedPopupMenu == null)
    		return;
    	setMenu(preservedPopupMenu);
    	preservedPopupMenu = null;
    }
    
    public Point getLastMousePosition() {
    	return new Point(lastMouseX, lastMouseY);
    }
    
	public void removeEverything() {
		Collection<Visualiser> visualisers = new HashSet<Visualiser>();
		for (Control child: getChildren())
			if (child instanceof Visualiser)
				visualisers.add((Visualiser)child);
		for (Visualiser visualiser: visualisers)
			visualiser.delete();
		rev.fireModelChangeEvent();
	}

	void clear() {
		for (Control control: getChildren())
			control.dispose();
	}

	public int getVisualiserCount() {
		int count = 0;
		for (Control child: getChildren())
			if (child instanceof Visualiser)
				count++;
		return count;
	}
	
	public Visualiser getVisualiser(String visualiserName) {
		for (Control child: getChildren()) {
			if (!(child instanceof Visualiser))
				continue;
			Visualiser childVisualiser = (Visualiser)child;
			if (childVisualiser.getID().compareTo(visualiserName) == 0)
				return childVisualiser;
		}
		return null;
	}
	
	public Visualiser getPossibleDropTarget(int i, int j, Visualiser visualiser) {
		for (Control child: getChildren()) {
			if (!(child instanceof Visualiser))
				continue;
			Visualiser childVisualiser = (Visualiser)child;
			if (visualiser.getBounds().intersects(childVisualiser.getBounds()) && childVisualiser.canReceiveDropOf(visualiser))
				return childVisualiser;
		}
		return null;
	}

	public RevDatabase getDatabase() {
		return rev.getDatabase();
	}

	public String getModelName() {
		return modelName;
	}

	public void setModelName(String name) {
		modelName = name;
	}
	
	public Rev getRev() {
		return rev;
	}
    
}