br.ufes.inf.nemo.ontouml.transformation.onto2info.ui.util.EmulatedNativeCheckBoxLabelProvider.java Source code

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Here is the source code for br.ufes.inf.nemo.ontouml.transformation.onto2info.ui.util.EmulatedNativeCheckBoxLabelProvider.java

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/*******************************************************************************
 * Copyright (c) 2006, 2010 Tom Schindl and others.
 * 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:
 *     Tom Schindl<tom.schindl@bestsolution.at> - initial API and implementation
 *     Florian Potschka<signalrauschen@gmail.com> - in bug 260061
 *     Alexander Ljungberg<siker@norwinter.com> - in bug 260061
 *******************************************************************************/

package br.ufes.inf.nemo.ontouml.transformation.onto2info.ui.util;

import org.eclipse.jface.resource.JFaceResources;
import org.eclipse.jface.util.Util;
import org.eclipse.jface.viewers.ColumnViewer;
import org.eclipse.jface.viewers.OwnerDrawLabelProvider;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.ImageData;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.TableItem;
import org.eclipse.swt.widgets.TreeItem;

public abstract class EmulatedNativeCheckBoxLabelProvider extends OwnerDrawLabelProvider {
    private static final String CHECKED_KEY = "CHECKED";
    private static final String UNCHECK_KEY = "UNCHECKED";

    public EmulatedNativeCheckBoxLabelProvider(ColumnViewer viewer) {
        if (JFaceResources.getImageRegistry().getDescriptor(CHECKED_KEY) == null) {
            JFaceResources.getImageRegistry().put(UNCHECK_KEY, makeShot(viewer.getControl(), false));
            JFaceResources.getImageRegistry().put(CHECKED_KEY, makeShot(viewer.getControl(), true));
        }
    }

    private Image makeShot(Control control, boolean type) {
        // Hopefully no platform uses exactly this color because we'll make
        // it transparent in the image.
        Color greenScreen = new Color(control.getDisplay(), 222, 223, 224);

        Shell shell = new Shell(control.getShell(), SWT.NO_TRIM);

        // otherwise we have a default gray color
        shell.setBackground(greenScreen);

        if (Util.isMac()) {
            Button button2 = new Button(shell, SWT.CHECK);
            Point bsize = button2.computeSize(SWT.DEFAULT, SWT.DEFAULT);

            // otherwise an image is stretched by width
            bsize.x = Math.max(bsize.x - 1, bsize.y - 1);
            bsize.y = Math.max(bsize.x - 1, bsize.y - 1);
            button2.setSize(bsize);
            button2.setLocation(100, 100);
        }

        Button button = new Button(shell, SWT.CHECK);
        button.setBackground(greenScreen);
        button.setSelection(type);

        // otherwise an image is located in a corner
        button.setLocation(1, 1);
        Point bsize = button.computeSize(SWT.DEFAULT, SWT.DEFAULT);

        // otherwise an image is stretched by width
        bsize.x = Math.max(bsize.x - 1, bsize.y - 1);
        bsize.y = Math.max(bsize.x - 1, bsize.y - 1);
        button.setSize(bsize);

        shell.setSize(bsize);

        shell.open();

        GC gc = new GC(shell);
        Image image = new Image(control.getDisplay(), bsize.x, bsize.y);
        gc.copyArea(image, 0, 0);
        gc.dispose();
        shell.close();

        ImageData imageData = image.getImageData();
        imageData.transparentPixel = imageData.palette.getPixel(greenScreen.getRGB());

        Image img = new Image(control.getDisplay(), imageData);
        image.dispose();

        return img;
    }

    public Image getImage(Object element) {
        if (isChecked(element)) {
            return JFaceResources.getImageRegistry().get(CHECKED_KEY);
        } else {
            return JFaceResources.getImageRegistry().get(UNCHECK_KEY);
        }
    }

    protected void measure(Event event, Object element) {
        event.height = getImage(element).getBounds().height;
    }

    protected void paint(Event event, Object element) {
        Image img = getImage(element);

        if (img != null) {
            Rectangle bounds;

            if (event.item instanceof TableItem) {
                bounds = ((TableItem) event.item).getBounds(event.index);
            } else {
                bounds = ((TreeItem) event.item).getBounds(event.index);
            }

            Rectangle imgBounds = img.getBounds();
            bounds.width /= 2;
            bounds.width -= imgBounds.width / 2;
            bounds.height /= 2;
            bounds.height -= imgBounds.height / 2;

            int x = bounds.width > 0 ? bounds.x + bounds.width : bounds.x;
            int y = bounds.height > 0 ? bounds.y + bounds.height : bounds.y;

            if (SWT.getPlatform().equals("carbon")) {
                event.gc.drawImage(img, x + 2, y - 1);
            } else {
                event.gc.drawImage(img, x, y - 1);
            }
        }
    }

    protected abstract boolean isChecked(Object element);
}