如何隐藏JScrollBar中的箭头按钮

Question

我需要在AWT应用程序中隐藏java.awt.Scrollbar(VERTICAL)的箭头按钮。 有谁知道如何实现这一目标？

我看到了一个示例here，但代码只是隐藏了按钮。按钮的空置空间仍然存在;它没有被滚动条占用。

更确切地说，这是我应该实现的截图。我不确定要走哪条路。

更新：我一直在寻找AWT的解决方案。但现在我也对Swing的建议持开放态度。

Answer 1

尝试这个..它用垂直ScrollBar上的常规按钮替换大小为0x0的按钮。

它确实限制了你的外观和感觉:(

JScrollPane scroller = new JScrollPane(mainPane);
scroller.setPreferredSize(new Dimension(200,200));
// ... etc
scroller.getVerticalScrollBar().setUI(new BasicScrollBarUI()
    {   
        @Override
        protected JButton createDecreaseButton(int orientation) {
            return createZeroButton();
        }

        @Override    
        protected JButton createIncreaseButton(int orientation) {
            return createZeroButton();
        }

        private JButton createZeroButton() {
            JButton jbutton = new JButton();
            jbutton.setPreferredSize(new Dimension(0, 0));
            jbutton.setMinimumSize(new Dimension(0, 0));
            jbutton.setMaximumSize(new Dimension(0, 0));
            return jbutton;
        }
    });

更新：抱歉，这是一个摇摆解决方案

Answer 2

使用Nimbus Look and Feel您可以使用此功能删除箭头按钮：

    UIManager.getLookAndFeelDefaults().put(
        "ScrollBar:\"ScrollBar.button\".size", 0);
    UIManager.getLookAndFeelDefaults().put(
        "ScrollBar.decrementButtonGap", 0);
    UIManager.getLookAndFeelDefaults().put(
        "ScrollBar.incrementButtonGap", 0);

以下是一个完整的例子：

public class ScrollDemo extends JFrame {

    public ScrollDemo() {

        String[] columnNames = {"Column"};
        Object[][] data = {
                {"A"},{"B"},{"C"},{"D"},{"E"},{"F"},
                {"A"},{"B"},{"C"},{"D"},{"E"},{"F"},
                {"A"},{"B"},{"C"},{"D"},{"E"},{"F"},
                {"A"},{"B"},{"C"},{"D"},{"E"},{"F"},
                {"A"},{"B"},{"C"},{"D"},{"E"},{"F"},
        };

        add(new JScrollPane(new JTable(data, columnNames)));
        pack();
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        setVisible(true);
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {

            @Override
            public void run() {

                try {
                    UIManager.setLookAndFeel("javax.swing.plaf.nimbus.NimbusLookAndFeel");
                } catch (Exception e) {
                    // No Nimbus
                }
                UIManager.getLookAndFeelDefaults().put(
                        "ScrollBar:ScrollBarThumb[Enabled].backgroundPainter",
                        new FillPainter(new Color(127, 169, 191)));
                UIManager.getLookAndFeelDefaults().put(
                        "ScrollBar:ScrollBarThumb[MouseOver].backgroundPainter",
                        new FillPainter(new Color(127, 169, 191)));
                UIManager.getLookAndFeelDefaults().put(
                        "ScrollBar:ScrollBarTrack[Enabled].backgroundPainter",
                        new FillPainter(new Color(190, 212, 223)));

                UIManager.getLookAndFeelDefaults().put(
                        "ScrollBar:\"ScrollBar.button\".size", 0);
                UIManager.getLookAndFeelDefaults().put(
                        "ScrollBar.decrementButtonGap", 0);
                UIManager.getLookAndFeelDefaults().put(
                        "ScrollBar.incrementButtonGap", 0);

                new ScrollDemo();
            }
        });
    }

}

所使用的Painter的代码：

public class FillPainter implements Painter<JComponent> {

    private final Color color;

    public FillPainter(Color c) { color = c; }

    @Override
    public void paint(Graphics2D g, JComponent object, int width, int height) {
        g.setColor(color);
        g.fillRect(0, 0, width-1, height-1);
    }

}