Attachment 267424 Details for Bug 502711 – modified Snippet240

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modified Snippet240

Snippet240.java (text/x-java), 3.13 KB, created by Lakshmi P Shanmugam

on 2017-03-23 07:47:32 EDT

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Creator: Lakshmi P Shanmugam

Created: 2017-03-23 07:47:32 EDT

Size: 3.13 KB

patch

obsolete

>/*******************************************************************************
> * Copyright (c) 2000, 2016 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 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 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 = 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, true);
>				}
>				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();
>}
>}

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Attachments on bug 502711: 267422 | 267424 | 267426 | 271820