java - JTextPane 文本在 Mac 操作系统中滚动时折叠

Question

我正在创建一个简单的 JTextPane 并在视口(viewport)设置后设置长文本，但是当我在 Mac os 10.11.5 中运行程序时，我的 JTextPane 文本行会折叠并显示彼此。当我缓慢滚动时，它不会发生，但是当我快速滚动时，它开始崩溃。这个问题在windows中不会出现。这是我的示例源代码:

public class JTextPaneScroll extends javax.swing.JFrame {

    private String s = "Wait! Some of your past questions have not been well-received, and you're in danger of being blocked from asking any more.\n"
        + "\n For help formulating a clear, useful question, see: How do I ask a good question?\n"
        + "Also, edit your previous questions to improve formatting and clarity."
        + "Wait! Some of your past questions have not been well-received, and you're in danger of being blocked from asking any more.\n"
        + "\n For help formulating a clear, useful question, see: How do I ask a good question?\n"
        + "Also, edit your previous questions to improve formatting and clarity."
        + "Wait! Some of your past questions have not been well-received, and you're in danger of being blocked from asking any more.\n"
        + "\n For help formulating a clear, useful question, see: How do I ask a good question?\n"
        + "Also, edit your previous questions to improve formatting and clarity.";

    public JTextPaneScroll() {
        initComponents();
        setTextToPane();
    }
// <editor-fold defaultstate="collapsed" desc="Generated Code">                          

    private void initComponents() {

        jspcomp = new javax.swing.JScrollPane();
        comp = new javax.swing.JTextPane();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        getContentPane().setLayout(new org.netbeans.lib.awtextra.AbsoluteLayout());

        jspcomp.setViewportView(comp);

        getContentPane().add(jspcomp, new org.netbeans.lib.awtextra.AbsoluteConstraints(30, 20, 290, 180));

        pack();
    }// </editor-fold>                        

    private void setTextToPane() {
        try {
            comp.setText(s);
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }

    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        /* Set the Nimbus look and feel */
        //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
        /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
     * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html 
         */
        try {
            javax.swing.UIManager.setLookAndFeel(javax.swing.UIManager.getSystemLookAndFeelClassName());
        } catch (ClassNotFoundException ex) {
            java.util.logging.Logger.getLogger(JTextPaneScroll.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(JTextPaneScroll.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(JTextPaneScroll.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(JTextPaneScroll.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>

        /* Create and display the form */
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new JTextPaneScroll().setVisible(true);
            }
        });
    }

// Variables declaration - do not modify                     
    private javax.swing.JTextPane comp;
    private javax.swing.JScrollPane jspcomp;
// End of variables declaration                   
}

Answer 1

JTextPane是可滚动，因此您可以将其设置为您想要的任何首选尺寸，并且仍然可以使用您想要的任何布局。默认情况下，组件会添加到 JFrame 的 BorderLayout.CENTER 中。您可以调整框架大小以查看会发生什么。

textPane = new javax.swing.JTextPane() {
    @Override
    public Dimension getPreferredScrollableViewportSize() {
        return new Dimension(290, 192);
    }
};

import java.awt.Dimension;

public class JTextPaneScroll extends javax.swing.JFrame {

    private javax.swing.JTextPane textPane;
    private javax.swing.JScrollPane scrollPane;

    private String s = ""
        + "Wait! Some of your past questions have not been well-received, and you're in danger of being blocked from asking any more.\n"
        + "For help formulating a clear, useful question, see: How do I ask a good question?\n"
        + "Also, edit your previous questions to improve formatting and clarity.\n"
        + "Wait! Some of your past questions have not been well-received, and you're in danger of being blocked from asking any more.\n"
        + "For help formulating a clear, useful question, see: How do I ask a good question?\n"
        + "Also, edit your previous questions to improve formatting and clarity.\n"
        + "Wait! Some of your past questions have not been well-received, and you're in danger of being blocked from asking any more.\n"
        + "For help formulating a clear, useful question, see: How do I ask a good question?\n"
        + "Also, edit your previous questions to improve formatting and clarity.\n";

    public JTextPaneScroll() {
        initComponents();
        setTextToPane();
    }

    private void initComponents() {
        scrollPane = new javax.swing.JScrollPane();
        textPane = new javax.swing.JTextPane() {
            @Override
            public Dimension getPreferredScrollableViewportSize() {
                return new Dimension(290, 192);
            }
        };
        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        scrollPane.setViewportView(textPane);
        add(scrollPane);
        pack();
    }

    private void setTextToPane() {
        try {
            textPane.setText(s);
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }

    public static void main(String args[]) {
        try {
            javax.swing.UIManager.setLookAndFeel(javax.swing.UIManager.getSystemLookAndFeelClassName());
        } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(JTextPaneScroll.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }

        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new JTextPaneScroll().setVisible(true);
            }
        });
    }
}