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/