org.eclipse.swt.snippets.Snippet283.java Source code

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Here is the source code for org.eclipse.swt.snippets.Snippet283.java

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/*******************************************************************************
 * Copyright (c) 2007, 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 left aligned icon, text and selection
 *
 * 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/
 */

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

public class Snippet283 {
    public static void main(String[] args) {
        Display display = new Display();
        Image image = new Image(display, Snippet283.class.getResourceAsStream("eclipse.png"));
        Shell shell = new Shell(display);
        shell.setText("Snippet 283");
        shell.setLayout(new FillLayout());
        final Table table = new Table(shell, SWT.FULL_SELECTION);
        for (int i = 0; i < 8; i++) {
            TableItem item = new TableItem(table, SWT.NONE);
            item.setText("Item " + i + " with long text that scrolls.");
            if (i % 2 == 1)
                item.setImage(image);
        }
        table.addListener(SWT.MouseDown, event -> {
            Rectangle rect = table.getClientArea();
            Point point = new Point(event.x, event.y);
            if (table.getItem(point) != null)
                return;
            for (int i = table.getTopIndex(); i < table.getItemCount(); i++) {
                TableItem item = table.getItem(i);
                Rectangle itemRect = item.getBounds();
                if (!itemRect.intersects(rect))
                    return;
                itemRect.x = rect.x;
                itemRect.width = rect.width;
                if (itemRect.contains(point)) {
                    table.setSelection(item);
                    Event selectionEvent = new Event();
                    selectionEvent.item = item;
                    table.notifyListeners(SWT.Selection, selectionEvent);
                    return;
                }
            }
        });
        /*
         * NOTE: MeasureItem, PaintItem and EraseItem are called repeatedly.
         * Therefore, it is critical for performance that these methods be
         * as efficient as possible.
         */
        table.addListener(SWT.EraseItem, event -> {
            event.detail &= ~SWT.FOREGROUND;
            String osName = System.getProperty("os.name");
            if (osName != null && osName.contains("Windows")) {
                if (osName.contains("Vista") || osName.contains("unknown")) {
                    return;
                }
            }
            event.detail &= ~(SWT.FOREGROUND | SWT.SELECTED | SWT.HOT | SWT.FOCUSED);
            GC gc = event.gc;
            TableItem item = (TableItem) event.item;
            Rectangle rect = table.getClientArea();
            Rectangle itemRect = item.getBounds();
            itemRect.x = rect.x;
            itemRect.width = rect.width;
            gc.setClipping((Rectangle) null);
            gc.fillRectangle(itemRect);
        });
        table.addListener(SWT.PaintItem, event -> {
            TableItem item = (TableItem) event.item;
            GC gc = event.gc;
            Image image1 = item.getImage(0);
            String text = item.getText(0);
            Point textExtent = gc.stringExtent(text);
            Rectangle imageRect = item.getImageBounds(0);
            Rectangle textRect = item.getTextBounds(0);
            int textY = textRect.y + Math.max(0, (textRect.height - textExtent.y) / 2);
            if (image1 == null) {
                gc.drawString(text, imageRect.x, textY, true);
            } else {
                Rectangle imageExtent = image1.getBounds();
                int imageY = imageRect.y + Math.max(0, (imageRect.height - imageExtent.height) / 2);
                gc.drawImage(image1, imageRect.x, imageY);
                gc.drawString(text, textRect.x, textY, true);
            }
        });
        shell.pack();
        shell.open();
        while (!shell.isDisposed()) {
            if (!display.readAndDispatch())
                display.sleep();
        }
        display.dispose();
    }
}