/****************************************************************************
 * Copyright (c) 2008, 2009 Jeremy Dowdall
 * 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:
 *    Jeremy Dowdall <jeremyd@aspencloud.com> - initial API and implementation
 *****************************************************************************/

package edu.ualberta.med.biobank.gui.common.widgets.nebula.v;

import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.internal.theme.ButtonDrawData;
import org.eclipse.swt.internal.theme.DrawData;
import org.eclipse.swt.internal.theme.Theme;
import org.eclipse.swt.widgets.Event;

@SuppressWarnings("restriction")
public class VButtonPainter extends VControlPainter {

    static boolean isWindows = System.getProperty("os.name").startsWith( //$NON-NLS-1$
        "Windows"); //$NON-NLS-1$

    @Override
    public void paintBackground(VControl control, Event e) {
        VButton button = (VButton) control;
        if (button.paintNative) {
            if (button.paintInactive
                || button.hasState(VButton.STATE_ACTIVE
                    | VButton.STATE_SELECTED)
                || (button == VTracker.getFocusControl())) {
                ButtonDrawData data = new ButtonDrawData();
                data.style = SWT.PUSH;
                if (button.hasState(VButton.STATE_SELECTED)) {
                    data.state[0] |= DrawData.HOT;
                    data.state[0] |= DrawData.PRESSED;
                } else if (button.hasState(VButton.STATE_ACTIVE)) {
                    data.state[0] |= DrawData.HOT;
                }
                if (button == VTracker.getFocusControl()) {
                    data.state[0] |= DrawData.FOCUSED;
                }
                if (e.gc.getAlpha() == 255) {
                    Theme theme = new Theme(e.display);
                    theme.drawBackground(e.gc, button.bounds, data);
                    theme.dispose();
                } else {
                    // Bug 260624 - ButtonDrawData#draw does not respect alpha
                    // setting
                    //
                    // BioBank - the following code crashes on Linux 64 bit
                    // systems
                    if (isWindows) {
                        Image img = new Image(e.display, new Rectangle(0, 0,
                            button.bounds.width, button.bounds.height));
                        GC gc = new GC(img);
                        Theme theme = new Theme(e.display);
                        theme.drawBackground(gc, img.getBounds(), data);
                        e.gc.drawImage(img, button.bounds.x, button.bounds.y);
                        theme.dispose();
                        gc.dispose();
                        img.dispose();
                    }
                }
            } else {
                super.paintBackground(control, e);
            }
        } else {
            super.paintBackground(control, e);
        }
    }

}