MainFrameGlassPane.java

/*
 * This file is part of the OSMembrane project.
 * More informations under www.osmembrane.de
 * 
 * The project is licensed under the GNU GENERAL PUBLIC LICENSE 3.0.
 * for more details about the license see http://www.osmembrane.de/license/
 * 
 * Source: $HeadURL$ ($Revision$)
 * Last changed: $Date$
 */

package de.osmembrane.view.frames;

import java.awt.GridLayout;
import java.awt.Point;
import java.awt.dnd.DragSource;

import javax.swing.JComponent;
import javax.swing.JPanel;

import de.osmembrane.view.panels.LibraryFunction;
import de.osmembrane.view.panels.StartPanel;

/**
 * Glass pane that improvises the drawing of the drag & drop
 * 
 * @author tobias_kuhn
 * 
 */
public class MainFrameGlassPane extends JComponent {

    private static final long serialVersionUID = -997512362081326789L;

    /**
     * the {@link LibraryFunction} that is currently dragged to store
     */
    private LibraryFunction dragAndDrop;

    /**
     * Initializer for new {@link MainFrameGlassPane}
     * 
     * @param showStartScreen
     *            whether the start screen shall be displayed upon
     *            initialization
     */
    public MainFrameGlassPane(boolean showStartScreen) {
        if (showStartScreen) {
            setLayout(new GridLayout(1, 1));
            JPanel startPanel = new StartPanel();
            add(startPanel);
        }
    }

    /**
     * Draws a specific {@link LibraryFunction} that is currently dragged & drop
     * where the cursor is
     * 
     * @param libraryFunction
     *            the view function to be drawn
     * @param point
     *            top left position of the view function to be drawn
     */
    public void dragAndDrop(LibraryFunction libraryFunction, Point point) {
        if (dragAndDrop == null) {
            // add the display function
            dragAndDrop = new LibraryFunction(null,
                    libraryFunction.getModelFunctionPrototype(), false);

            dragAndDrop.setSize(libraryFunction.getPreferredSize());
            dragAndDrop.forceHighlight(true);
            dragAndDrop.setCursor(DragSource.DefaultCopyDrop);

            add(dragAndDrop);
            setVisible(true);
        }
        dragAndDrop.setLocation(point);
    }

    /**
     * Ends the current drag and drop functionality and restores normal behavior
     */
    public void endDragAndDrop() {
        if (dragAndDrop != null) {
            remove(dragAndDrop);
            dragAndDrop = null;
        }
        setVisible(false);
    }

}