TextLayoutSubscriptSuperscript.java Source code

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Here is the source code for TextLayoutSubscriptSuperscript.java

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/*******************************************************************************
 * 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;
/*
 * TextLayout example snippet: using the rise field of a TextStyle.
 *
 * 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.graphics.Font;
import org.eclipse.swt.graphics.FontData;
import org.eclipse.swt.graphics.FontMetrics;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.graphics.TextLayout;
import org.eclipse.swt.graphics.TextStyle;
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 TextLayoutSubscriptSuperscript {

    public static void main(String[] args) {
        Display display = new Display();
        Shell shell = new Shell(display, SWT.SHELL_TRIM | SWT.DOUBLE_BUFFERED);
        shell.setText("Modify Rise");
        FontData data = display.getSystemFont().getFontData()[0];
        Font font = new Font(display, data.getName(), 24, SWT.NORMAL);
        Font smallFont = new Font(display, data.getName(), 8, SWT.NORMAL);
        GC gc = new GC(shell);
        gc.setFont(smallFont);
        FontMetrics smallMetrics = gc.getFontMetrics();
        final int smallBaseline = smallMetrics.getAscent() + smallMetrics.getLeading();
        gc.setFont(font);
        FontMetrics metrics = gc.getFontMetrics();
        final int baseline = metrics.getAscent() + metrics.getLeading();
        gc.dispose();

        final TextLayout layout0 = new TextLayout(display);
        layout0.setText("SubscriptScriptSuperscript");
        layout0.setFont(font);
        TextStyle subscript0 = new TextStyle(smallFont, null, null);
        TextStyle superscript0 = new TextStyle(smallFont, null, null);
        superscript0.rise = baseline - smallBaseline;
        layout0.setStyle(subscript0, 0, 8);
        layout0.setStyle(superscript0, 15, 25);

        final TextLayout layout1 = new TextLayout(display);
        layout1.setText("SubscriptScriptSuperscript");
        layout1.setFont(font);
        TextStyle subscript1 = new TextStyle(smallFont, null, null);
        subscript1.rise = -smallBaseline;
        TextStyle superscript1 = new TextStyle(smallFont, null, null);
        superscript1.rise = baseline;
        layout1.setStyle(subscript1, 0, 8);
        layout1.setStyle(superscript1, 15, 25);

        shell.addListener(SWT.Paint, new Listener() {
            public void handleEvent(Event event) {
                Display display = event.display;
                GC gc = event.gc;

                Rectangle rect0 = layout0.getBounds();
                rect0.x += 10;
                rect0.y += 10;
                gc.setBackground(display.getSystemColor(SWT.COLOR_WHITE));
                gc.setForeground(display.getSystemColor(SWT.COLOR_BLACK));
                gc.fillRectangle(rect0);
                layout0.draw(gc, rect0.x, rect0.y);
                gc.setForeground(display.getSystemColor(SWT.COLOR_MAGENTA));
                gc.drawLine(rect0.x, rect0.y, rect0.x + rect0.width, rect0.y);
                gc.drawLine(rect0.x, rect0.y + baseline, rect0.x + rect0.width, rect0.y + baseline);
                gc.drawLine(rect0.x + rect0.width / 2, rect0.y, rect0.x + rect0.width / 2, rect0.y + rect0.height);

                Rectangle rect1 = layout1.getBounds();
                rect1.x += 10;
                rect1.y += 20 + rect0.height;
                gc.setBackground(display.getSystemColor(SWT.COLOR_WHITE));
                gc.setForeground(display.getSystemColor(SWT.COLOR_BLACK));
                gc.fillRectangle(rect1);
                layout1.draw(gc, rect1.x, rect1.y);

                gc.setForeground(display.getSystemColor(SWT.COLOR_MAGENTA));
                gc.drawLine(rect1.x, rect1.y + smallBaseline, rect1.x + rect1.width, rect1.y + smallBaseline);
                gc.drawLine(rect1.x, rect1.y + baseline + smallBaseline, rect1.x + rect1.width,
                        rect1.y + baseline + smallBaseline);
                gc.drawLine(rect1.x + rect1.width / 2, rect1.y, rect1.x + rect1.width / 2, rect1.y + rect1.height);
            }
        });
        shell.open();
        while (!shell.isDisposed()) {
            if (!display.readAndDispatch())
                display.sleep();
        }
        layout0.dispose();
        layout1.dispose();
        smallFont.dispose();
        font.dispose();
        display.dispose();
    }
}