Draw a box around text : StyledText « SWT « Java Tutorial

1. Java Tutorial
2. SWT
3. StyledText

/*******************************************************************************
 * 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;
/*
 * StyledText snippet: Draw a box around text.
 * 
 * For a list of all SWT example snippets see
 * http://www.eclipse.org/swt/snippets/
 */

import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.StyledText;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Shell;

public class TextAroundBox {
  static String SEARCH_STRING = "box";

  public static void main(String[] args) {
    final Display display = new Display();
    final Color RED = display.getSystemColor(SWT.COLOR_RED);
    Shell shell = new Shell(display);
    shell.setBounds(10, 10, 250, 250);
    final StyledText text = new StyledText(shell, SWT.NONE);
    text.setBounds(10, 10, 200, 200);
    text.addListener(SWT.Paint, new Listener() {
      public void handleEvent(Event event) {
        String contents = text.getText();
        int stringWidth = event.gc.stringExtent(SEARCH_STRING).x;
        int lineHeight = text.getLineHeight();
        event.gc.setForeground(RED);
        int index = contents.indexOf(SEARCH_STRING);
        while (index != -1) {
          Point topLeft = text.getLocationAtOffset(index);
          event.gc.drawRectangle(topLeft.x - 1, topLeft.y, stringWidth + 1, lineHeight - 1);
          index = contents.indexOf(SEARCH_STRING, index + 1);
        }
      }
    });
    text
        .setText("This demonstrates drawing a box\naround every occurrence of the word\nbox in the StyledText");
    shell.open();
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch())
        display.sleep();
    }
    display.dispose();
  }
}

17.42.StyledText
	17.42.1.	Creating a StyledText Widget
	17.42.2.	Create a StyledText that scrolls vertically, wraps text, and displays a border:
	17.42.3.	Using the Clipboard
	17.42.4.	Draw a box around text
	17.42.5.	StyledText: embed images
	17.42.6.	StyledText: use gradient background
	17.42.7.	StyledText: embed controls
	17.42.8.	Getting Statistics: Caret Offset, Total Lines of Text, Total Characters and Current Line
	17.42.9.	Print StyledText out
	17.42.10.	Print to the default printer in a separate thread
	17.42.11.	Set page format for printing
	17.42.12.	Make a StyledText read-only
	17.42.13.	Limit the number of characters that the StyledText accepts
	17.42.14.	Replace Text Range
	17.42.15.	Understanding the Repercussions
	17.42.16.	A simple editor