Question

我使用了JOptionpane作为错误消息，该消息由JDialog上的错误用户输入调用。

模态类型：APPLICATION MODAL
modalExclusionType：APPLICATION_EXCLUDE

问题是当JOptionpane出现时JDialog仍然有效。下面是调用JOptionpane

的代码

   JOptionPane.showMessageDialog(JDialog's name, "you must fill in all required fields", "Error!", 0);

有什么方法可以解决这个问题吗？

这是一个最小的示例程序

import javax.swing.JOptionPane;


public class Modality extends javax.swing.JFrame {


    public Modality() {
        initComponents();
    }


    private void initComponents() {

        jDialog1 = new javax.swing.JDialog();
        jTextField1 = new javax.swing.JTextField();
        jButton2 = new javax.swing.JButton();
        jLabel1 = new javax.swing.JLabel();
        jButton1 = new javax.swing.JButton();

        jDialog1.setModalExclusionType(java.awt.Dialog.ModalExclusionType.APPLICATION_EXCLUDE);
        jDialog1.setModalityType(java.awt.Dialog.ModalityType.APPLICATION_MODAL);

        jButton2.setText("JOptionpane");
        jButton2.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton2ActionPerformed(evt);
            }
        });

        jLabel1.setText("Type in the textfield while the jdialog is visible");

        javax.swing.GroupLayout jDialog1Layout = new javax.swing.GroupLayout(jDialog1.getContentPane());
        jDialog1.getContentPane().setLayout(jDialog1Layout);
        jDialog1Layout.setHorizontalGroup(
            jDialog1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jDialog1Layout.createSequentialGroup()
                .addGroup(jDialog1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(jDialog1Layout.createSequentialGroup()
                        .addGap(109, 109, 109)
                        .addComponent(jButton2))
                    .addGroup(jDialog1Layout.createSequentialGroup()
                        .addGap(76, 76, 76)
                        .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, 154, javax.swing.GroupLayout.PREFERRED_SIZE))
                    .addGroup(jDialog1Layout.createSequentialGroup()
                        .addGap(50, 50, 50)
                        .addComponent(jLabel1)))
                .addContainerGap(82, Short.MAX_VALUE))
        );
        jDialog1Layout.setVerticalGroup(
            jDialog1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jDialog1Layout.createSequentialGroup()
                .addGap(111, 111, 111)
                .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addGap(18, 18, 18)
                .addComponent(jButton2)
                .addGap(18, 18, 18)
                .addComponent(jLabel1)
                .addContainerGap(96, Short.MAX_VALUE))
        );

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        jButton1.setText(" View JDialog");
        jButton1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton1ActionPerformed(evt);
            }
        });

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(97, 97, 97)
                .addComponent(jButton1)
                .addContainerGap(122, Short.MAX_VALUE))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(101, 101, 101)
                .addComponent(jButton1, javax.swing.GroupLayout.PREFERRED_SIZE, 51, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap(105, Short.MAX_VALUE))
        );

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

    private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {

        jDialog1.pack();
        jDialog1.setVisible(true);
    }

    private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {

        JOptionPane.showMessageDialog(jDialog1, "Hello World! What's wrong with focus?");
    }



    public static void main(String args[]) {


        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException ex) {
            java.util.logging.Logger.getLogger(Modality.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(Modality.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(Modality.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(Modality.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>


        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new Modality().setVisible(true);
            }
        });
    }
    // Variables declaration - do not modify
    private javax.swing.JButton jButton1;
    private javax.swing.JButton jButton2;
    private javax.swing.JDialog jDialog1;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JTextField jTextField1;

}

Answer 1

问题在于：

modalExclusionType：APPLICATION_EXCLUDE

根据Window API：

指定此窗口的模式排除类型。 如果窗口被模态排除，则不会被某些模式对话框阻止。有关可能的模态排除类型，请参阅Dialog.ModalExclusionType。

如果你没有设置它，那么JOptionPane就可以很好地阻止对话窗口了。

为什么Joptionpane不是JDialog之上的模态

1 个答案: