net.sf.solareclipse.ui.ColorEditor.java Source code

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Here is the source code for net.sf.solareclipse.ui.ColorEditor.java

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/**********************************************************************
Copyright (c) 2002  Widespace, OU  and others.
All rights reserved.   This program and the accompanying materials
are made available under the terms of the Common Public License v1.0
which accompanies this distribution, and is available at
http://solareclipse.sourceforge.net/legal/cpl-v10.html
    
Contributors:
   Igor Malinin - initial contribution
    
$Id$
**********************************************************************/
package net.sf.solareclipse.ui;

import org.eclipse.jface.resource.JFaceResources;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.DisposeEvent;
import org.eclipse.swt.events.DisposeListener;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.Font;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.RGB;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.ColorDialog;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Display;

/**
 * A "button" of a certain color determined by the color picker.
 */
public class ColorEditor {
    private Point extent;

    Button button;
    Image image;

    RGB rgb;
    Color color;

    public ColorEditor(Composite parent) {
        button = new Button(parent, SWT.PUSH);
        extent = computeImageSize(parent);
        image = new Image(parent.getDisplay(), extent.x, extent.y);

        GC gc = new GC(image);

        gc.setBackground(button.getBackground());
        gc.fillRectangle(0, 0, extent.x, extent.y);

        gc.dispose();

        button.setImage(image);

        button.addSelectionListener(new SelectionAdapter() {
            public void widgetSelected(SelectionEvent event) {
                ColorDialog colorDialog = new ColorDialog(button.getShell());
                colorDialog.setRGB(rgb);

                RGB newColor = colorDialog.open();
                if (newColor != null) {
                    rgb = newColor;
                    updateColorImage();
                }
            }
        });

        button.addDisposeListener(new DisposeListener() {
            public void widgetDisposed(DisposeEvent event) {
                if (image != null) {
                    image.dispose();
                    image = null;
                }

                if (color != null) {
                    color.dispose();
                    color = null;
                }
            }
        });
    }

    public RGB getColorValue() {
        return rgb;
    }

    public void setColorValue(RGB rgb) {
        this.rgb = rgb;

        updateColorImage();
    }

    public Button getButton() {
        return button;
    }

    protected void updateColorImage() {
        Display display = button.getDisplay();

        GC gc = new GC(image);

        gc.setForeground(display.getSystemColor(SWT.COLOR_BLACK));
        gc.drawRectangle(0, 2, extent.x - 1, extent.y - 4);

        if (color != null) {
            color.dispose();
        }

        color = new Color(display, rgb);

        gc.setBackground(color);
        gc.fillRectangle(1, 3, extent.x - 2, extent.y - 5);

        gc.dispose();

        button.setImage(image);
    }

    protected Point computeImageSize(Control control) {
        Font f = JFaceResources.getFontRegistry().get(JFaceResources.DEFAULT_FONT);

        GC gc = new GC(control);
        gc.setFont(f);

        int height = gc.getFontMetrics().getHeight();

        gc.dispose();

        return new Point(height * 3 - 6, height);
    }
}