java - 使文本字段在复选框的 itemStatechanged 事件中可见

Question

如何使文本字段在 Swing 中复选框的 itemStatechanged 事件中可见？

我正在尝试创建一个带有复选框和文本字段的框架。我希望只有在选中复选框时才显示文本字段。因此，当我初始化组件时，我将 textfield.setvisible 设置为 false 并为复选框添加了 addItemListener 并调用 itemStateChanged 事件并且复选框被选中，我将 setVisible 方法设置为 true。

我的 SSCCE 看起来像:

package ui;
public class Evaluator extends javax.swing.JFrame {
public Evaluator() {
    initComponents();
}
private void initComponents() {

    jCheckBox1 = new javax.swing.JCheckBox();
    jTextField1 = new javax.swing.JTextField();
    jTextField1.setVisible(false);
    setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
    setPreferredSize(new java.awt.Dimension(800, 800));
    jCheckBox1.setFont(new java.awt.Font("Tahoma", 0, 14));
    jCheckBox1.setText("Properties");
    jCheckBox1.addItemListener(new java.awt.event.ItemListener() {
        public void itemStateChanged(java.awt.event.ItemEvent evt) {
            jCheckBox1ItemStateChanged(evt);
        }
    });
    jTextField1.setFont(new java.awt.Font("Tahoma", 0, 14));
    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()
            .addComponent(jCheckBox1)
            .addGap(41, 41, 41)
            .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, 109, javax.swing.GroupLayout.PREFERRED_SIZE)
            .addContainerGap(155, Short.MAX_VALUE))
    );
    layout.setVerticalGroup(
        layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
            .addContainerGap(229, Short.MAX_VALUE)
            .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                .addComponent(jCheckBox1)
                .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, 37, javax.swing.GroupLayout.PREFERRED_SIZE))
            .addGap(34, 34, 34))
    );
    pack();
}
private void jCheckBox1ItemStateChanged(java.awt.event.ItemEvent evt) {                                            
    // TODO add your handling code here:
     if(evt.getStateChange()== java.awt.event.ItemEvent.SELECTED){
        jTextField1.setVisible(true);

   }
}                                           
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(Evaluator.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (InstantiationException ex) {
        java.util.logging.Logger.getLogger(Evaluator.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (IllegalAccessException ex) {
        java.util.logging.Logger.getLogger(Evaluator.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (javax.swing.UnsupportedLookAndFeelException ex) {
        java.util.logging.Logger.getLogger(Evaluator.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    }
    java.awt.EventQueue.invokeLater(new Runnable() {
        public void run() {
            new Evaluator().setVisible(true);
        }
    });
}
private javax.swing.JCheckBox jCheckBox1;
private javax.swing.JTextField jTextField1;                
}

Answer 1

基本上，您需要使框架(或父容器)无效以强制重新布局

private void jCheckBox2ItemStateChanged(java.awt.event.ItemEvent evt) {
    jTextField1.setVisible(jCheckBox2.isSelected());
    invalidate();
    validate();
}

已更新

我还建议您避免将整个 UI 添加到顶级容器中，而是使用 JPanel 作为基础组件并围绕它们构建 UI。准备就绪后，只需将基础面板添加到您需要的任何顶级容器中即可。