Question

在我的应用程序中，我有3个扩展JInternalframe的类。一个是MainFrame。假设Mainframe有四个JTextFields。 TF1, TF2, TF3, TF4。默认情况下，MainFrame打开时TF1获得焦点。

现在，用户将按Enter键并转到TF2。在下一步中，取决于条件另一个JInternalFrame SubFrame_1或SubFrame_2将作为浮动窗口打开。

SubFrame_1有四种不同的TextField。 TF5, TF6, TF7, TF8。默认情况下，TF5再次获得焦点。一些计算将在此处完成，当用户按下输入TF8 SubFrame_1时将进行处理。主框架应重新关注TF3。相同的条件可能适用于SubFrame_2。但是当SubFrame_1处置TF3时，永远不会获得焦点。更糟糕的是，有时当SubFrame被处理时，MainFrame不会聚焦。我该怎样摆脱这个问题？我尝试了各种功能requestFocusInWindow()，requestFocus()，grabFocus()等。请帮忙。

Answer 1

这是我的小例子： public class Form1 extends javax.swing.JFrame {

/**
 * Creates new form Form1
 */
public Form1() {
    initComponents();
    this.jInternalFrame2.setVisible(false);
    this.jInternalFrame3.setVisible(false);

}

/**
 * This method is called from within the constructor to initialize the form.
 * WARNING: Do NOT modify this code. The content of this method is always
 * regenerated by the Form Editor.
 */
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">                          
private void initComponents() {

    jInternalFrame1 = new javax.swing.JInternalFrame();
    jButton1 = new javax.swing.JButton();
    jTextField1 = new javax.swing.JTextField();
    jTextField2 = new javax.swing.JTextField();
    jTextField3 = new javax.swing.JTextField();
    jInternalFrame2 = new javax.swing.JInternalFrame();
    jInternalFrame3 = new javax.swing.JInternalFrame();
    jTextField4 = new javax.swing.JTextField();
    jTextField5 = new javax.swing.JTextField();
    jButton2 = new javax.swing.JButton();

    setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

    jInternalFrame1.setTitle("JIF1");
    jInternalFrame1.setVisible(true);

    jButton1.setText("Focus In JIF 2");
    jButton1.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            jButton1ActionPerformed(evt);
        }
    });

    jTextField1.setText("jTextField1");

    jTextField2.setText("jTextField1");

    jTextField3.setText("jTextField1");

    javax.swing.GroupLayout jInternalFrame1Layout = new javax.swing.GroupLayout(jInternalFrame1.getContentPane());
    jInternalFrame1.getContentPane().setLayout(jInternalFrame1Layout);
    jInternalFrame1Layout.setHorizontalGroup(
        jInternalFrame1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(jInternalFrame1Layout.createSequentialGroup()
            .addContainerGap()
            .addGroup(jInternalFrame1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addComponent(jButton1, javax.swing.GroupLayout.DEFAULT_SIZE, 179, Short.MAX_VALUE)
                .addGroup(jInternalFrame1Layout.createSequentialGroup()
                    .addGroup(jInternalFrame1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                        .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addComponent(jTextField2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addComponent(jTextField3, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                    .addGap(0, 0, Short.MAX_VALUE)))
            .addContainerGap())
    );
    jInternalFrame1Layout.setVerticalGroup(
        jInternalFrame1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jInternalFrame1Layout.createSequentialGroup()
            .addContainerGap()
            .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
            .addComponent(jTextField2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
            .addComponent(jTextField3, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 109, Short.MAX_VALUE)
            .addComponent(jButton1)
            .addContainerGap())
    );

    jInternalFrame2.setVisible(true);

    javax.swing.GroupLayout jInternalFrame2Layout = new javax.swing.GroupLayout(jInternalFrame2.getContentPane());
    jInternalFrame2.getContentPane().setLayout(jInternalFrame2Layout);
    jInternalFrame2Layout.setHorizontalGroup(
        jInternalFrame2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGap(0, 0, Short.MAX_VALUE)
    );
    jInternalFrame2Layout.setVerticalGroup(
        jInternalFrame2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGap(0, 128, Short.MAX_VALUE)
    );

    jInternalFrame3.setTitle("JIF2");
    jInternalFrame3.setVisible(true);

    jTextField4.setText("jTextField4");

    jTextField5.setText("jTextField5");

    jButton2.setText("Focus in JIF 1");
    jButton2.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            jButton2ActionPerformed(evt);
        }
    });

    javax.swing.GroupLayout jInternalFrame3Layout = new javax.swing.GroupLayout(jInternalFrame3.getContentPane());
    jInternalFrame3.getContentPane().setLayout(jInternalFrame3Layout);
    jInternalFrame3Layout.setHorizontalGroup(
        jInternalFrame3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(jInternalFrame3Layout.createSequentialGroup()
            .addContainerGap()
            .addGroup(jInternalFrame3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addComponent(jTextField4, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addComponent(jTextField5, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
            .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
        .addComponent(jButton2, javax.swing.GroupLayout.DEFAULT_SIZE, 284, Short.MAX_VALUE)
    );
    jInternalFrame3Layout.setVerticalGroup(
        jInternalFrame3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(jInternalFrame3Layout.createSequentialGroup()
            .addContainerGap()
            .addComponent(jTextField4, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
            .addComponent(jTextField5, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
            .addComponent(jButton2)
            .addContainerGap())
    );

    javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
    getContentPane().setLayout(layout);
    layout.setHorizontalGroup(
        layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(layout.createSequentialGroup()
            .addContainerGap()
            .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
                .addComponent(jInternalFrame1)
                .addComponent(jInternalFrame2))
            .addGap(18, 18, 18)
            .addComponent(jInternalFrame3, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
            .addContainerGap(121, Short.MAX_VALUE))
    );
    layout.setVerticalGroup(
        layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(layout.createSequentialGroup()
            .addContainerGap()
            .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
                .addComponent(jInternalFrame3)
                .addComponent(jInternalFrame1))
            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
            .addComponent(jInternalFrame2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
            .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
    );

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

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
    this.jInternalFrame3.setVisible(true);
    this.jTextField4.requestFocus();
    this.jInternalFrame1.setVisible(false);
}                                        

private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {                                         
    this.jInternalFrame1.setVisible(true);
    this.jTextField3.requestFocus();
    this.jInternalFrame3.setVisible(false);
}                                        

/**
 * @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 {
        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(Form1.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (InstantiationException ex) {
        java.util.logging.Logger.getLogger(Form1.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (IllegalAccessException ex) {
        java.util.logging.Logger.getLogger(Form1.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (javax.swing.UnsupportedLookAndFeelException ex) {
        java.util.logging.Logger.getLogger(Form1.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 Form1().setVisible(true);
        }
    });
}
// Variables declaration - do not modify                     
private javax.swing.JButton jButton1;
private javax.swing.JButton jButton2;
private javax.swing.JInternalFrame jInternalFrame1;
private javax.swing.JInternalFrame jInternalFrame2;
private javax.swing.JInternalFrame jInternalFrame3;
private javax.swing.JTextField jTextField1;
private javax.swing.JTextField jTextField2;
private javax.swing.JTextField jTextField3;
private javax.swing.JTextField jTextField4;
private javax.swing.JTextField jTextField5;
// End of variables declaration

}

JTextfield聚焦在两个JInternalFrame之间

1 个答案: