org.bonitasoft.studio.migration.ui.view.CheckboxLabelProvider.java Source code

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Here is the source code for org.bonitasoft.studio.migration.ui.view.CheckboxLabelProvider.java

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/**
 * Copyright (C) 2012-2013 BonitaSoft S.A.
 * BonitaSoft, 32 rue Gustave Eiffel - 38000 Grenoble
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 2.0 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.bonitasoft.studio.migration.ui.view;

import org.bonitasoft.studio.migration.model.report.Change;
import org.eclipse.jface.resource.JFaceResources;
import org.eclipse.jface.viewers.ILabelProvider;
import org.eclipse.jface.viewers.StyledCellLabelProvider;
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;

public class CheckboxLabelProvider extends StyledCellLabelProvider implements ILabelProvider {

    private static final String CHECKED_KEY = "checkedKey";//NON-NLS-1
    private static final String UNCHECK_KEY = "uncheckKey";//NON-NLS-1

    public CheckboxLabelProvider(Control control) {
        if (JFaceResources.getImageRegistry().getDescriptor(CHECKED_KEY) == null) {
            JFaceResources.getImageRegistry().put(UNCHECK_KEY, makeShot(control, false));
            JFaceResources.getImageRegistry().put(CHECKED_KEY, makeShot(control, true));
        }
    }

    @Override
    public Image getImage(Object element) {
        return null;
    }

    @Override
    public String getText(Object element) {
        if (element instanceof Change) {
            return Boolean.valueOf(((Change) element).isReviewed()).toString();
        }
        return Boolean.FALSE.toString();
    }

    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);

        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());

        return new Image(control.getDisplay(), imageData);
    }

    @Override
    protected void paint(Event event, Object element) {
        super.paint(event, element);
        Image image = null;
        Change change = (Change) element;
        if (change.isReviewed()) {
            image = JFaceResources.getImage(CHECKED_KEY);
        } else {
            image = JFaceResources.getImage(UNCHECK_KEY);
        }
        Rectangle bounds = ((TableItem) event.item).getBounds(event.index);
        Rectangle imgBounds = image.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;

        event.gc.drawImage(image, x, y);
    }

}