显示了JPanel的大小，另一个JPanel已显示 [英] JPanel gets resized of another JPanel is shown

问题描述

我有一个关于嵌套BoxLayouts的问题.

I have a question about nested BoxLayouts.

我想构建一个DropDownPanel，它由2个子面板组成:顶部的标题和底部的主体.身体最初是隐藏的.通过单击标题，您可以切换主体的可见性并显示其内容(例如展开/折叠).

I want to build a DropDownPanel which consists of 2 sub-Panels: a header at the top and a body at the bottom. The body is initially hidden. By clicking on the header you can toggle the visibility of the body and show its contents (like expand/collapse).

通常，这很好.但是，有一些奇怪的行为:
如果只有一个DropDownPanel展开而另一个已折叠，则折叠后的DropDownPanel会调整大小并浮动到右侧.

In general this works fine. However there is some strange behaviour:
If only one DropDownPanel is expanded and the other is collapsed then the collapsed DropDownPanel gets resized and floated to the right.

我已经尝试过JPanel的属性，例如alignmentX，但是我找不到我的错误. 有人知道我在做什么错吗?

I already experimented with the JPanel's properties like alignmentX, but I could not find my mistake. Does anyone know what I am doing wrong?

这是代码:
DropDownPanel.java

Here is the code:
DropDownPanel.java

public class DropDownPanel extends javax.swing.JPanel {

    private boolean mShowContent = false;

    /**
     * Creates new form DropDownPanel
     */
    public DropDownPanel() {
        initComponents();
        showContent(mShowContent);
    }

    private void showContent(boolean showContent) {
        mShowContent = showContent;
        System.out.println(mShowContent? "show" : "hide");
        body.setVisible(mShowContent);
        revalidate();
    }

    /**
     * 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">//GEN-BEGIN:initComponents
    private void initComponents() {

        jPanel3 = new javax.swing.JPanel();
        header = new javax.swing.JPanel();
        jLabel1 = new javax.swing.JLabel();
        body = new javax.swing.JPanel();
        jPanel5 = new javax.swing.JPanel();
        jLabel2 = new javax.swing.JLabel();

        setBorder(javax.swing.BorderFactory.createLineBorder(new java.awt.Color(0, 0, 0)));
        setLayout(new javax.swing.BoxLayout(this, javax.swing.BoxLayout.Y_AXIS));

        jPanel3.setLayout(new javax.swing.BoxLayout(jPanel3, javax.swing.BoxLayout.Y_AXIS));

        header.setMaximumSize(new java.awt.Dimension(32000, 60));
        header.setMinimumSize(new java.awt.Dimension(0, 60));
        header.setPreferredSize(new java.awt.Dimension(0, 60));
        header.addMouseListener(new java.awt.event.MouseAdapter() {
            public void mouseClicked(java.awt.event.MouseEvent evt) {
                headerMouseClicked(evt);
            }
        });
        header.setLayout(new javax.swing.BoxLayout(header, javax.swing.BoxLayout.X_AXIS));

        jLabel1.setText("Click Me!");
        header.add(jLabel1);

        jPanel3.add(header);

        body.setLayout(new javax.swing.BoxLayout(body, javax.swing.BoxLayout.Y_AXIS));

        jPanel5.setLayout(new javax.swing.BoxLayout(jPanel5, javax.swing.BoxLayout.X_AXIS));

        jLabel2.setText("jLabel2");
        jPanel5.add(jLabel2);

        body.add(jPanel5);

        jPanel3.add(body);

        add(jPanel3);
    }// </editor-fold>//GEN-END:initComponents

    private void headerMouseClicked(java.awt.event.MouseEvent evt) {//GEN-FIRST:event_headerMouseClicked
        System.out.println("asd");
        showContent(!mShowContent);
    }//GEN-LAST:event_headerMouseClicked
    // Variables declaration - do not modify//GEN-BEGIN:variables
    private javax.swing.JPanel body;
    private javax.swing.JPanel header;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JLabel jLabel2;
    private javax.swing.JPanel jPanel3;
    private javax.swing.JPanel jPanel5;
    // End of variables declaration//GEN-END:variables
}

TestFrame.java

TestFrame.java

public class TestFrame extends javax.swing.JFrame {

    /**
     * Creates new form TestFrame
     */
    public TestFrame() {
        initComponents();
        jPanel1.add(new DropDownPanel());
        jPanel1.add(new DropDownPanel());
        revalidate();
    }

    /**
     * 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">//GEN-BEGIN:initComponents
    private void initComponents() {

        jScrollPane1 = new javax.swing.JScrollPane();
        jPanel1 = new javax.swing.JPanel();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        setMinimumSize(new java.awt.Dimension(400, 300));

        jPanel1.setLayout(new javax.swing.BoxLayout(jPanel1, javax.swing.BoxLayout.Y_AXIS));
        jScrollPane1.setViewportView(jPanel1);

        getContentPane().add(jScrollPane1, java.awt.BorderLayout.CENTER);

        pack();
    }// </editor-fold>//GEN-END:initComponents

    /**
     * @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(TestFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(TestFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(TestFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(TestFrame.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 TestFrame().setVisible(true);
            }
        });
    }
    // Variables declaration - do not modify//GEN-BEGIN:variables
    private javax.swing.JPanel jPanel1;
    private javax.swing.JScrollPane jScrollPane1;
    // End of variables declaration//GEN-END:variables
}

推荐答案

不确定您的问题是您...

not sure from your question are you ...

• 手风琴

或

• 扩展/折叠JPanels

或

• 丝带(仅具有物质外观)

• Ribbon (with Substance Look and Feel only)

这篇关于显示了JPanel的大小，另一个JPanel已显示的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！