我有JFrame和一个在单击事件时打开JPopupMenu的按钮。
此JPopupMenu具有一个带有按钮的JPanel。该按钮应该用于放置JPopupMenu。只要JFrame没有最大化,它就会执行的操作。但是,当JFrame最大化时,它将关闭Jframe本身。

任何帮助或指向解决此问题的指针将不胜感激。

(我正在使用netbeans开发它。)

//Demo.Java

public class Demo extends javax.swing.JFrame {
    public JPopupMenu menu1;

    public Demo() {
        initComponents();
        menu1 = new JPopupMenu();
        menu1.add(new MyJPanel());
    }

    @SuppressWarnings("unchecked")
    private void initComponents() {
        jButton1 = new javax.swing.JButton();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        jButton1.setText("Open JPopupMenu");
        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(53, 53, 53)
                .addComponent(jButton1)
                .addContainerGap(224, Short.MAX_VALUE))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(85, 85, 85)
                .addComponent(jButton1)
                .addContainerGap(192, Short.MAX_VALUE))
        );

        pack();
    }

    private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
        menu1.show(jButton1,0,0);
    }

    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new Demo().setVisible(true);
            }
        });
    }

    // Variables declaration - do not modify
    private javax.swing.JButton jButton1;
    // End of variables declaration
}


下面是MyJpanel的代码。

// MyJPanel.java
package demo;

import java.awt.Window;
import javax.swing.SwingUtilities;

public class MyJPanel extends javax.swing.JPanel {
    public MyJPanel() {
        initComponents();
    }
    @SuppressWarnings("unchecked")
    private void initComponents() {

        jTabbedPane1 = new javax.swing.JTabbedPane();
        jPanel1 = new javax.swing.JPanel();
        jButton1 = new javax.swing.JButton();
        jPanel2 = new javax.swing.JPanel();

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

        javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
        jPanel1.setLayout(jPanel1Layout);
        jPanel1Layout.setHorizontalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel1Layout.createSequentialGroup()
                .addGap(82, 82, 82)
                .addComponent(jButton1)
                .addContainerGap(192, Short.MAX_VALUE))
        );
        jPanel1Layout.setVerticalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel1Layout.createSequentialGroup()
                .addGap(122, 122, 122)
                .addComponent(jButton1)
                .addContainerGap(127, Short.MAX_VALUE))
        );

        jButton1.getAccessibleContext().setAccessibleName("closeParent");

        jTabbedPane1.addTab("tab1", jPanel1);

        javax.swing.GroupLayout jPanel2Layout = new javax.swing.GroupLayout(jPanel2);
        jPanel2.setLayout(jPanel2Layout);
        jPanel2Layout.setHorizontalGroup(
            jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 395, Short.MAX_VALUE)
        );
        jPanel2Layout.setVerticalGroup(
            jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 272, Short.MAX_VALUE)
        );

        jTabbedPane1.addTab("tab2", jPanel2);

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(this);
        this.setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addComponent(jTabbedPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 400, Short.MAX_VALUE)
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addComponent(jTabbedPane1)
        );
    }

    private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
        Window w = SwingUtilities.getWindowAncestor(MyJPanel.this);
        w.dispose();
    }

    // Variables declaration - do not modify
    private javax.swing.JButton jButton1;
    private javax.swing.JPanel jPanel1;
    private javax.swing.JPanel jPanel2;
    private javax.swing.JTabbedPane jTabbedPane1;
    // End of variables declaration


}

最佳答案

我认为,您的意思是:


  当JFrame最大化时,它将关闭JPopupMenu本身


JPopupMenu菜单的状态分别与其祖先(JFrame)或整个窗口系统紧密绑定。它将在焦点丢失,鼠标/按键按下时隐藏……实际上在任何窗口中的任何状态更改或输入事件中都将其隐藏,就像从普通弹出菜单中期望的那样。解决此问题将迫使您重新打开菜单(捕获事件很难甚至不可能)。但是,这将导致闪烁。注意,JPopupMenu可能依赖于不复杂的平台窗口系统的固定基本机制,因此不能通过AWT / Swing更改其行为。

最近我想要类似的东西。使用JTable切换JPopupMenu的多个列的可见性。
但是随后,随着黑客行为的泛滥,我决定使用带JDialog的模态JList和包含条目的JList。将悬停效果添加到JTable(或SwingUtilities.getWindowAncestor(MyJPanel.this))是一种可移植且可重复使用的效果,与上面提到的任何hack相比,它的问题少得多:Change JList item background color on hover



编辑:

Window

由于JPopupMenu不是getWindowAncestor(),因此JpopupMenu找不到应该完全关闭的,如下所示:

public class MyJPanel extends javax.swing.JPanel {
    //...

    /**
     * Try to find and hide the first enclosing JPopupMenu by traversing the
     * parent components
     */
    private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
        for (Component parent = this.getParent(); parent != null; parent = parent.getParent())
            if (parent instanceof JPopupMenu) {
                ((JPopupMenu) parent).setVisible(false);
                break;
            }
    }

    //...
}

关于java - 在父JFrame处于最大化状态下关闭JPopupMenu时发出的问题,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/19344295/

10-12 16:35