org.eclipse.swt.snippets.Snippet230.java Source code

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Here is the source code for org.eclipse.swt.snippets.Snippet230.java

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/*******************************************************************************
 * Copyright (c) 2000, 2016 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.swt.snippets;

/*
 * Table example snippet: draw images on right side of table item
 *
 * For more info on custom-drawing TableItem and TreeItem content see
 * http://www.eclipse.org/articles/article.php?file=Article-CustomDrawingTableAndTreeItems/index.html
 *
 * For a list of all SWT example snippets see
 * http://www.eclipse.org/swt/snippets/
 *
 * @since 3.2
 */

import org.eclipse.swt.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;

public class Snippet230 {

    public static void main(String[] args) {
        Display display = new Display();
        final Image image = display.getSystemImage(SWT.ICON_INFORMATION);
        Shell shell = new Shell(display);
        shell.setText("Images on the right side of the TableItem");
        shell.setLayout(new FillLayout());
        Table table = new Table(shell, SWT.MULTI | SWT.FULL_SELECTION);
        table.setHeaderVisible(true);
        table.setLinesVisible(true);
        int columnCount = 3;
        for (int i = 0; i < columnCount; i++) {
            TableColumn column = new TableColumn(table, SWT.NONE);
            column.setText("Column " + i);
        }
        int itemCount = 8;
        for (int i = 0; i < itemCount; i++) {
            TableItem item = new TableItem(table, SWT.NONE);
            item.setText(new String[] { "item " + i + " a", "item " + i + " b", "item " + i + " c" });
        }
        /*
         * NOTE: MeasureItem, PaintItem and EraseItem are called repeatedly.
         * Therefore, it is critical for performance that these methods be
         * as efficient as possible.
         */
        Listener paintListener = event -> {
            switch (event.type) {
            case SWT.MeasureItem: {
                Rectangle rect1 = image.getBounds();
                event.width += rect1.width;
                event.height = Math.max(event.height, rect1.height + 2);
                break;
            }
            case SWT.PaintItem: {
                int x = event.x + event.width;
                Rectangle rect2 = image.getBounds();
                int offset = Math.max(0, (event.height - rect2.height) / 2);
                event.gc.drawImage(image, x, event.y + offset);
                break;
            }
            }
        };
        table.addListener(SWT.MeasureItem, paintListener);
        table.addListener(SWT.PaintItem, paintListener);

        for (int i = 0; i < columnCount; i++) {
            table.getColumn(i).pack();
        }
        shell.setSize(500, 200);
        shell.open();
        while (!shell.isDisposed()) {
            if (!display.readAndDispatch())
                display.sleep();
        }
        if (image != null)
            image.dispose();
        display.dispose();
    }
}