| /******************************************************************************* |
| * 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 example snippet: Multiple lines in a TreeItem |
| * |
| * 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 Snippet227 { |
| public static void main(String [] args) { |
| Display display = new Display(); |
| Shell shell = new Shell (display); |
| shell.setText("Multiple lines in a TreeItem"); |
| shell.setLayout (new FillLayout()); |
| final Tree tree = new Tree(shell, SWT.MULTI | SWT.FULL_SELECTION); |
| tree.setHeaderVisible(true); |
| tree.setLinesVisible(true); |
| int columnCount = 4; |
| for (int i=0; i<columnCount; i++) { |
| TreeColumn column = new TreeColumn(tree, SWT.NONE); |
| column.setText("Column " + i); |
| column.setWidth(100); |
| } |
| int itemCount = 3; |
| for (int i=0; i<itemCount; i++) { |
| TreeItem item1 = new TreeItem(tree, SWT.NONE); |
| item1.setText("item "+i); |
| for (int c=1; c < columnCount; c++) { |
| item1.setText(c, "item ["+i+"-"+c+"]"); |
| } |
| for (int j=0; j<itemCount; j++) { |
| TreeItem item2 = new TreeItem(item1, SWT.NONE); |
| item2.setText("item ["+i+" "+j+"]"); |
| for (int c=1; c<columnCount; c++) { |
| item2.setText(c, "item ["+i+" "+j+"-"+c+"]"); |
| } |
| for (int k=0; k<itemCount; k++) { |
| TreeItem item3 = new TreeItem(item2, SWT.NONE); |
| item3.setText("item ["+i+" "+j+" "+k+"]"); |
| for (int c=1; c<columnCount; c++) { |
| item3.setText(c, "item ["+i+" "+j+" "+k+"-"+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 = new Listener() { |
| public void handleEvent(Event event) { |
| switch(event.type) { |
| case SWT.MeasureItem: { |
| TreeItem item = (TreeItem)event.item; |
| String text = getText(item, event.index); |
| Point size = event.gc.textExtent(text); |
| event.width = size.x; |
| event.height = Math.max(event.height, size.y); |
| break; |
| } |
| case SWT.PaintItem: { |
| TreeItem item = (TreeItem)event.item; |
| String text = getText(item, event.index); |
| Point size = event.gc.textExtent(text); |
| int offset2 = event.index == 0 ? Math.max(0, (event.height - size.y) / 2) : 0; |
| event.gc.drawText(text, event.x, event.y + offset2, true); |
| break; |
| } |
| case SWT.EraseItem: { |
| event.detail &= ~SWT.FOREGROUND; |
| break; |
| } |
| } |
| } |
| String getText(TreeItem item, int column) { |
| String text = item.getText(column); |
| if (column != 0) { |
| TreeItem parent = item.getParentItem(); |
| int index = parent == null ? tree.indexOf(item) : parent.indexOf(item); |
| if ((index+column) % 3 == 1){ |
| text +="\nnew line"; |
| } |
| if ((index+column) % 3 == 2) { |
| text +="\nnew line\nnew line"; |
| } |
| } |
| return text; |
| } |
| }; |
| tree.addListener(SWT.MeasureItem, paintListener); |
| tree.addListener(SWT.PaintItem, paintListener); |
| tree.addListener(SWT.EraseItem, paintListener); |
| |
| shell.setSize(600, 400); |
| shell.open(); |
| while (!shell.isDisposed()) { |
| if (!display.readAndDispatch()) display.sleep(); |
| } |
| display.dispose(); |
| } |
| } |