JTextAreaWordWrapTest.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 */

/* @test
 * @key headful
 * @bug 8212904
 * @summary Verifies JTextArea line wrapping using UI scale
 * @run main JTextAreaWordWrapTest
 */
import java.awt.BorderLayout;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.io.IOException;
import java.net.URISyntaxException;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.ScrollPaneConstants;
import javax.swing.SwingUtilities;

public class JTextAreaWordWrapTest {

    static JFrame frame;
    static JFrame frame1;
    static JTextArea textArea;
    static JTextArea textArea1;

    public static void doWrapOnTest() {

        frame = new JFrame();
        frame.setSize( 720, 300 );
        frame.setLayout( new BorderLayout() );

        textArea = new JTextArea();
        textArea.setLineWrap( true );
        textArea.setWrapStyleWord( true );

        StringBuffer sb = new StringBuffer();
        for (int i = 0; i < 100; i++) {
            sb.append( "zz zzz zzzz zz zz zz zzz xzzzz zzzzzzzzzzzzzzzzx yyyyyyy tttttttttt sssss hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh\n" );
        }
        textArea.setText( sb.toString() );
        JScrollPane pane = new JScrollPane( textArea,
                                            ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS,
                                            ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED );
        frame.add( pane, BorderLayout.CENTER );
        frame.setVisible( true );

    }

    public static void doWrapOffTest() {
        frame1 = new JFrame();
        frame1.setSize( 720, 300 );
        frame1.setLayout( new BorderLayout() );

        textArea1 = new JTextArea();

        StringBuffer sb1 = new StringBuffer();
        for (int i = 0; i < 100; i++) {
            sb1.append( "zz zzz zzzz zz zz zz zzz xzzzz zzzzzzzzzzzzzzzzx yyyyyyy tttttttttt sssss hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh\n" );
        }
        textArea1.setText( sb1.toString() );
        JScrollPane pane1 = new JScrollPane( textArea1,
                                             ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS,
                                             ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED );
        frame1.add( pane1, BorderLayout.CENTER );
        frame1.setLocationRelativeTo(null);
        frame1.setVisible( true );
    }

    public static void main( String[] args ) throws Exception {
        System.setProperty( "sun.java2d.uiScale", "1.25" );
        try {
            SwingUtilities.invokeAndWait(() -> doWrapOnTest());
            Thread.sleep(500);
            SwingUtilities.invokeAndWait(() -> doWrapOffTest());
            Thread.sleep(500);

            SwingUtilities.invokeAndWait(() -> {

                int wraponHeight = textArea.getHeight();
                System.out.println("wraponheight " + wraponHeight);
                int wrapoffHeight = textArea1.getHeight();
                System.out.println("wrapoffheight " + wrapoffHeight);

                if (wraponHeight == wrapoffHeight) {
                    throw new RuntimeException("JTextArea line wrapping incorrect when using UI scale");
                }
            });

        } finally {
            SwingUtilities.invokeAndWait(() -> frame.dispose());
            SwingUtilities.invokeAndWait(() -> frame1.dispose());
        }
    }
}