StyledText: use gradient background : StyledText « SWT « Java Tutorial





StyledText: use gradient background
/*******************************************************************************
 * Copyright (c) 2000, 2005 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;
/*
 * SWT StyledText snippet: use gradient background.
 * 
 * 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.custom.StyledText;
import org.eclipse.swt.graphics.Font;
import org.eclipse.swt.graphics.FontData;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.Rectangle;
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;

public class StyledTextGradientBackground {

  static String text = "Plans do not materialize out of nowhere, nor are they entirely static. To ensure the planning process is "
      + "transparent and open to the entire Eclipse community, we (the Eclipse PMC) post plans in an embryonic "
      + "form and revise them throughout the release cycle. \n"
      + "The first part of the plan deals with the important matters of release deliverables, release milestones, target "
      + "operating environments, and release-to-release compatibility. These are all things that need to be clear for "
      + "any release, even if no features were to change.  \n";

  static Image oldImage;

  public static void main(String[] args) {
    final Display display = new Display();
    final Shell shell = new Shell(display);
    shell.setLayout(new FillLayout());
    final StyledText styledText = new StyledText(shell, SWT.WRAP | SWT.BORDER);
    styledText.setText(text);
    FontData data = display.getSystemFont().getFontData()[0];
    Font font = new Font(display, data.getName(), 16, SWT.BOLD);
    styledText.setFont(font);
    styledText.setForeground(display.getSystemColor(SWT.COLOR_BLUE));
    styledText.addListener(SWT.Resize, new Listener() {
      public void handleEvent(Event event) {
        Rectangle rect = styledText.getClientArea();
        Image newImage = new Image(display, 1, Math.max(1, rect.height));
        GC gc = new GC(newImage);
        gc.setForeground(display.getSystemColor(SWT.COLOR_WHITE));
        gc.setBackground(display.getSystemColor(SWT.COLOR_YELLOW));
        gc.fillGradientRectangle(rect.x, rect.y, 1, rect.height, true);
        gc.dispose();
        styledText.setBackgroundImage(newImage);
        if (oldImage != null)
          oldImage.dispose();
        oldImage = newImage;
      }
    });
    shell.setSize(700, 400);
    shell.open();
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch())
        display.sleep();
    }
    if (oldImage != null)
      oldImage.dispose();
    font.dispose();
    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:Create a StyledText that scrolls vertically, wraps text, and displays a border:
17.42.3.Using the ClipboardUsing the Clipboard
17.42.4.Draw a box around textDraw a box around text
17.42.5.StyledText: embed imagesStyledText: embed images
17.42.6.StyledText: use gradient backgroundStyledText: use gradient background
17.42.7.StyledText: embed controlsStyledText: embed controls
17.42.8.Getting Statistics: Caret Offset, Total Lines of Text, Total Characters and Current LineGetting Statistics: Caret Offset, Total Lines of Text, Total Characters and Current Line
17.42.9.Print StyledText outPrint 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 acceptsLimit the number of characters that the StyledText accepts
17.42.14.Replace Text RangeReplace Text Range
17.42.15.Understanding the Repercussions
17.42.16.A simple editorA simple editor