TextSpanMultipleColumns.java Source code

Introduction

Here is the source code for TextSpanMultipleColumns.java

Source

/*******************************************************************************
 * Copyright (c) 2000, 2006 IBM Corporation 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:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
//package org.eclipse.swt.snippets;
/* 
 * Table snippet: make text span multiple columns
 *
 * For a list of all SWT example snippets see
 * http://www.eclipse.org/swt/snippets/
 * 
 * @since 3.2
 */

import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Table;
import org.eclipse.swt.widgets.TableColumn;
import org.eclipse.swt.widgets.TableItem;

public class TextSpanMultipleColumns {

    public static void main(String[] args) {
        final Display display = new Display();
        Shell shell = new Shell(display);
        shell.setText("Text spans two columns in a TableItem");
        shell.setLayout(new FillLayout());
        final Table table = new Table(shell, SWT.MULTI | SWT.FULL_SELECTION);
        table.setHeaderVisible(true);
        int columnCount = 4;
        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(0, "item " + i + " a");
            item.setText(3, "item " + i + " d");
        }
        /*
         * NOTE: MeasureItem, PaintItem and EraseItem are called repeatedly.
         * Therefore, it is critical for performance that these methods be as
         * efficient as possible.
         */
        final String string = "text that spans two columns";
        GC gc = new GC(table);
        final Point extent = gc.stringExtent(string);
        gc.dispose();
        final Color red = display.getSystemColor(SWT.COLOR_RED);
        Listener paintListener = new Listener() {
            public void handleEvent(Event event) {
                switch (event.type) {
                case SWT.MeasureItem: {
                    if (event.index == 1 || event.index == 2) {
                        event.width = extent.x / 2;
                        event.height = Math.max(event.height, extent.y + 2);
                    }
                    break;
                }
                case SWT.PaintItem: {
                    if (event.index == 1 || event.index == 2) {
                        int offset = 0;
                        if (event.index == 2) {
                            TableColumn column1 = table.getColumn(1);
                            offset = column1.getWidth();
                        }
                        event.gc.setForeground(red);
                        int y = event.y + (event.height - extent.y) / 2;
                        event.gc.drawString(string, event.x - offset, y);
                    }
                    break;
                }
                }
            }
        };
        table.addListener(SWT.MeasureItem, paintListener);
        table.addListener(SWT.PaintItem, paintListener);
        for (int i = 0; i < columnCount; i++) {
            table.getColumn(i).pack();
        }
        shell.pack();
        shell.open();
        while (!shell.isDisposed()) {
            if (!display.readAndDispatch())
                display.sleep();
        }
        display.dispose();
    }
}