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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
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 *
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 * 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).
 *
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 * 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
 * @bug 4210250
 * @summary Tests that PlainView repaints the necessary lines of text.
 * @library /java/awt/regtesthelpers
 * @build PassFailJFrame
 * @run main/manual PaintTest
 */

import java.awt.Container;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Rectangle;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.SwingUtilities;

public class PaintTest {

    private static final String INSTRUCTIONS =
        "Click the paint button.\n" +
        "If half of the second line is erased,\n" +
        "that is you can only see the bottom half of the second line\n" +
        "with the top half painted over in white, click fail, else click pass.";


    public static void main(String[] args) throws Exception {
        PassFailJFrame.builder()
                .title("PlainView Repaint Instructions")
                .instructions(INSTRUCTIONS)
                .rows(7)
                .columns(35)
                .testUI(PaintTest::createTestUI)
                .build()
                .awaitAndCheck();
    }

    private static JFrame createTestUI() {
        JFrame frame = new JFrame("PaintTest");

        new PaintTest().create(frame.getContentPane());
        frame.pack();
        return frame;
    }


    void create(Container parent) {
        parent.setLayout(new FlowLayout());

        final JTextArea ta = new JTextArea
            ("A sample textarea\nwith a couple of lines\nof text") {
                public Dimension getPreferredSize() {
                    Dimension size = super.getPreferredSize();
                    if (getFont() != null) {
                        size.height += getFontMetrics(getFont())
                                       .getHeight() / 2;
                    }
                    return size;
                }
            };
        JButton button = new JButton("paint");

        button.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent ae) {
                SwingUtilities.invokeLater(new Runnable() {
                    public void run() {
                        Rectangle taBounds = ta.getBounds();
                        int fontHeight =
                            ta.getFontMetrics(ta.getFont()).getHeight();

                        taBounds.height = fontHeight + fontHeight / 2;
                        ta.repaint(taBounds);
                    }
                });
            }
        });

        parent.add(new JScrollPane(ta));
        parent.add(button);
    }
}