org.eclipse.swt.snippets.Snippet218.java Source code

Introduction

Here is the source code for org.eclipse.swt.snippets.Snippet218.java

Source

/*******************************************************************************
 * Copyright (c) 2000, 2016 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * 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.*;
import org.eclipse.swt.custom.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;

public class Snippet218 {

    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.setText("Snippet 218");
        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, 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();
    }
}