JAVA setVisible 不隐藏组件

Question

我试图隐藏除 1 之外的所有 jList，它是从 jcomboBox (cbLists) 的索引中获得的，它并没有真正隐藏 jLists，就像禁用而不是隐藏一样，我需要它隐藏所有内容，就像完全不可见一样，除了 1 这是我正在尝试的代码:

package javaapplication2;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;


public class Form1 extends javax.swing.JFrame {

    public Form1() {
        initComponents();

        ActionListener actionListener = (ActionEvent e) -> {
            System.out.println("Selected: " + cbLists.getSelectedItem());
            System.out.println(", Position: " + cbLists.getSelectedIndex());
            setCB(cbLists.getSelectedIndex());
        };
        cbLists.addActionListener(actionListener);
    }

    private void setCB(int index) {
        switch (index) {
            case 1:
                jList1.setVisible(false);
                jList4.setVisible(false);
                jList3.setVisible(false);
                jList2.setVisible(true);
                break;
            case 2:
                jList1.setVisible(false);
                jList2.setVisible(false);
                jList3.setVisible(true);
                jList4.setVisible(false);
                break;
            case 3:
                jList1.setVisible(false);
                jList2.setVisible(false);
                jList3.setVisible(false);
                jList4.setVisible(true);
                break;
            default:
                jList1.setVisible(true);
                jList2.setVisible(false);
                jList3.setVisible(false);
                jList4.setVisible(false);
                break;
        }

    }

    /**
     * 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() {

        cbLists = new javax.swing.JComboBox<>();
        jScrollPane1 = new javax.swing.JScrollPane();
        jList1 = new javax.swing.JList<>();
        jScrollPane2 = new javax.swing.JScrollPane();
        jList2 = new javax.swing.JList<>();
        jScrollPane3 = new javax.swing.JScrollPane();
        jList3 = new javax.swing.JList<>();
        jScrollPane4 = new javax.swing.JScrollPane();
        jList4 = new javax.swing.JList<>();

        cbLists.setModel(new javax.swing.DefaultComboBoxModel<>(new String[] { "jList1", "jList2", "jList3", "jList4" }));

        jList1.setModel(new javax.swing.AbstractListModel<String>() {
            String[] strings = { "Item 1", "Item 2", "Item 3", "Item 4", "Item 5" };
            public int getSize() { return strings.length; }
            public String getElementAt(int i) { return strings[i]; }
        });
        jScrollPane1.setViewportView(jList1);

        jList2.setModel(new javax.swing.AbstractListModel<String>() {
            String[] strings = { "Item 1", "Item 2", "Item 3", "Item 4", "Item 5" };
            public int getSize() { return strings.length; }
            public String getElementAt(int i) { return strings[i]; }
        });
        jScrollPane2.setViewportView(jList2);

        jList3.setModel(new javax.swing.AbstractListModel<String>() {
            String[] strings = { "Item 1", "Item 2", "Item 3", "Item 4", "Item 5" };
            public int getSize() { return strings.length; }
            public String getElementAt(int i) { return strings[i]; }
        });
        jScrollPane3.setViewportView(jList3);

        jList4.setModel(new javax.swing.AbstractListModel<String>() {
            String[] strings = { "Item 1", "Item 2", "Item 3", "Item 4", "Item 5" };
            public int getSize() { return strings.length; }
            public String getElementAt(int i) { return strings[i]; }
        });
        jScrollPane4.setViewportView(jList4);

        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)
                    .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 248, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(cbLists, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addContainerGap(622, Short.MAX_VALUE))
            .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addGroup(layout.createSequentialGroup()
                    .addGap(25, 25, 25)
                    .addComponent(jScrollPane2, javax.swing.GroupLayout.PREFERRED_SIZE, 248, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addContainerGap(612, Short.MAX_VALUE)))
            .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addGroup(layout.createSequentialGroup()
                    .addGap(35, 35, 35)
                    .addComponent(jScrollPane3, javax.swing.GroupLayout.PREFERRED_SIZE, 248, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addContainerGap(602, Short.MAX_VALUE)))
            .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addGroup(layout.createSequentialGroup()
                    .addGap(45, 45, 45)
                    .addComponent(jScrollPane4, javax.swing.GroupLayout.PREFERRED_SIZE, 248, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addContainerGap(592, Short.MAX_VALUE)))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(jScrollPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 266, Short.MAX_VALUE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addComponent(cbLists, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addGap(143, 143, 143))
            .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addGroup(layout.createSequentialGroup()
                    .addGap(26, 26, 26)
                    .addComponent(jScrollPane2, javax.swing.GroupLayout.DEFAULT_SIZE, 266, Short.MAX_VALUE)
                    .addGap(168, 168, 168)))
            .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addGroup(layout.createSequentialGroup()
                    .addGap(36, 36, 36)
                    .addComponent(jScrollPane3, javax.swing.GroupLayout.DEFAULT_SIZE, 266, Short.MAX_VALUE)
                    .addGap(158, 158, 158)))
            .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addGroup(layout.createSequentialGroup()
                    .addGap(46, 46, 46)
                    .addComponent(jScrollPane4, javax.swing.GroupLayout.DEFAULT_SIZE, 266, Short.MAX_VALUE)
                    .addGap(148, 148, 148)))
        );

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

    /**
     * @param args the command line arguments
     */
    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 | InstantiationException | IllegalAccessException | javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(Form1.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }


        /* Create and display the form */
        java.awt.EventQueue.invokeLater(() -> {
            new Form1().setVisible(true);
        });
    }

    // Variables declaration - do not modify                     
    private javax.swing.JComboBox<String> cbLists;
    private javax.swing.JList<String> jList1;
    private javax.swing.JList<String> jList2;
    private javax.swing.JList<String> jList3;
    private javax.swing.JList<String> jList4;
    private javax.swing.JScrollPane jScrollPane1;
    private javax.swing.JScrollPane jScrollPane2;
    private javax.swing.JScrollPane jScrollPane3;
    private javax.swing.JScrollPane jScrollPane4;
    // End of variables declaration                   
}

正如您在图像中看到的，jList2 被选择在 jList1 后面，我需要它位于前面，其余部分不可见，这很奇怪......

Answer 1

我认为您想隐藏 jScrollPane1 - jScrollPane4。所以您看到的灰色框是 JScrollPanes。它们没有被禁用，它们只是空的，因为您在其中隐藏了白名单。您必须隐藏整个 Pane 。

如果您愿意，您可以稍微改进您的代码...例如您可以创建滚动 Pane 列表

private List<JScrollPane> scrollPaneList = new ArrayList<>();

并将您的 Pane 添加到列表中

this.scrollPaneList.addAll(Arrays.asList(jScrollPane1, jScrollPane2, jScrollPane3, jScrollPane4));

然后你可以做这样的事情

    private void setCB(int index)
    {
        for (int i = 0; i < scrollPaneList.size(); i++)
        {
            scrollPaneList.get(i).setVisible(index == i);
        }      

    }