Java example source code file (Test6526631.java)

This example Java source code file (Test6526631.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

awt, cols, dimension, error, gui, jframe, jscrollbar, jscrollpane, jtextarea, jviewport, offset, rows, swing, test6526631, throwable

The Test6526631.java Java example source code

/*
 * Copyright (c) 2009, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * 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.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

/*
 * @test
 * @bug 6526631
 * @summary Resizes right-oriented scroll pane
 * @author Sergey Malenkov
 * @library ..
 */

import java.awt.ComponentOrientation;
import java.awt.Dimension;
import javax.swing.JFrame;
import javax.swing.JScrollBar;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JViewport;

public class Test6526631 {

    private static final int COLS = 90;
    private static final int ROWS = 50;
    private static final int OFFSET = 10;

    public static void main(String[] args) throws Throwable {
        SwingTest.start(Test6526631.class);
    }

    private final JScrollPane pane;
    private final JFrame frame;

    public Test6526631(JFrame frame) {
        this.pane = new JScrollPane(new JTextArea(ROWS, COLS));
        this.pane.setComponentOrientation(ComponentOrientation.RIGHT_TO_LEFT);
        this.frame = frame;
        this.frame.add(this.pane);
    }

    private void update(int offset) {
        Dimension size = this.frame.getSize();
        size.width += offset;
        this.frame.setSize(size);
    }

    public void validateFirst() {
        validateThird();
        update(OFFSET);
    }

    public void validateSecond() {
        validateThird();
        update(-OFFSET);
    }

    public void validateThird() {
        JViewport viewport = this.pane.getViewport();
        JScrollBar scroller = this.pane.getHorizontalScrollBar();
        if (!scroller.getComponentOrientation().equals(ComponentOrientation.RIGHT_TO_LEFT)) {
            throw new Error("unexpected component orientation");
        }
        int value = scroller.getValue();
        if (value != 0) {
            throw new Error("unexpected scroll value");
        }
        int extent = viewport.getExtentSize().width;
        if (extent != scroller.getVisibleAmount()) {
            throw new Error("unexpected visible amount");
        }
        int size = viewport.getViewSize().width;
        if (size != scroller.getMaximum()) {
            throw new Error("unexpected maximum");
        }
        int pos = size - extent - value;
        if (pos != viewport.getViewPosition().x) {
            throw new Error("unexpected position");
        }
    }
}