| /******************************************************************************* |
| * 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; |
| |
| /* |
| * Tree snippet: Text that spans multiple columns |
| * |
| * 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 Snippet240 { |
| |
| public static void main(String [] args) { |
| final Display display = new Display(); |
| Shell shell = new Shell (display); |
| shell.setText("Text spans two columns in a TreeItem"); |
| shell.setLayout (new FillLayout()); |
| final Tree tree = new Tree(shell, SWT.MULTI | SWT.FULL_SELECTION); |
| tree.setHeaderVisible(true); |
| int columnCount = 4; |
| for (int i=0; i<columnCount; i++) { |
| TreeColumn column = new TreeColumn(tree, SWT.NONE); |
| column.setText("Column " + i); |
| } |
| int itemCount = 8; |
| for (int i = 0; i < itemCount; i++) { |
| TreeItem item = new TreeItem(tree, SWT.NONE); |
| item.setText(0, "item "+i+" a"); |
| item.setText(3, "item "+i+" d"); |
| for (int j = 0; j < 3; j++) { |
| TreeItem subItem = new TreeItem(item, SWT.NONE); |
| subItem.setText(0, "subItem "+i+"-"+j+" a"); |
| subItem.setText(3, "subItem "+i+"-"+j+" 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(tree); |
| 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) { |
| TreeColumn column1 = tree.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; |
| } |
| } |
| } |
| }; |
| tree.addListener(SWT.MeasureItem, paintListener); |
| tree.addListener(SWT.PaintItem, paintListener); |
| for (int i = 0; i < columnCount; i++) { |
| tree.getColumn(i).pack(); |
| } |
| shell.pack(); |
| shell.open(); |
| while(!shell.isDisposed()) { |
| if(!display.readAndDispatch()) display.sleep(); |
| } |
| display.dispose(); |
| } |
| } |