防止在按ALT时关闭JPopupMenu [英] Prevent JPopupMenu from closing when ALT is pressed
问题描述
希望有人可以提供帮助.我想使用过滤器从 Swingbits . 我想利用buildin机会通过正则表达式过滤不同的项目.最大的问题是,似乎无法输入| (管道)在搜索字段中.弹出窗口(基于JPopupmenu)始终在按Alt-Gr时关闭.我试图删除Alt-Gr的键绑定,但没有任何效果.似乎它在内部深处.任何想法如何解决这个问题? 提前致谢. 朱莉安(Juliane)
hopefully someone can give some help. I want to use the filter for JTables from swingbits. I wanted to use the buildin opportunity to filter the distinct items by regular expressions. The big problem is, it seems impossible to enter a | (pipe) in the search field. The popup (based on JPopupmenu) always closes just when pressing Alt-Gr. I tried to remove the keybindings for Alt-Gr, with no effect. It seems it is somewhere deep inside. Any ideas how to solve this? Thanks in advance. Juliane
推荐答案
类似于Windows L& F的功能,它在Java源代码中很深.但是我找到了另一种解决方案.
Looks like a feature of Windows L&F, which is somewhere deep in the Java source code. But I've found another solution.
import java.awt.Color;
import java.awt.Window;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.event.WindowFocusListener;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.JWindow;
import javax.swing.Popup;
import javax.swing.PopupFactory;
import javax.swing.SwingConstants;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import javax.swing.WindowConstants;
import javax.swing.border.LineBorder;
public class PopupTest implements Runnable {
private Popup popup;
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (Exception e) {
e.printStackTrace();
}
JFrame frm = new JFrame("Popup test");
JLabel label = new JLabel("Click somewhere right mouse button to get a popup");
label.setHorizontalAlignment(SwingConstants.CENTER);
label.addMouseListener(new MouseAdapter() {
@Override
public void mouseClicked(MouseEvent e) {
if (SwingUtilities.isRightMouseButton(e)) {
if (popup != null) {
popup.hide();
}
JTextField field = new JTextField(10);
JLabel lbl = new JLabel("Enter text here: ");
JPanel p = new JPanel();
p.add(lbl);
p.add(field);
p.setBorder(new LineBorder(Color.BLACK));
popup = PopupFactory.getSharedInstance().getPopup(label, p, e.getXOnScreen(), e.getYOnScreen());
// we need some logic for a heavy-weight popup
Window win = SwingUtilities.windowForComponent(p);
if (win instanceof JWindow) {
// if heavy weight make the window focusable
win.setFocusableWindowState(true);
// and install focus listener to hide popup when it lost focus
win.addWindowFocusListener(new WindowFocusListener() {
@Override
public void windowLostFocus(WindowEvent e) {
if (popup != null) {
popup.hide();
}
}
@Override
public void windowGainedFocus(WindowEvent e) {
// TODO Auto-generated method stub
}
});
}
popup.show();
field.requestFocus();
}
}
});
frm.addWindowListener(new WindowAdapter() {
@Override
public void windowDeactivated(WindowEvent e) {
if (popup != null) {
popup.hide();
}
}
});
frm.add(label);
frm.setSize(500, 200);
frm.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
frm.setLocationRelativeTo(null);
frm.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new PopupTest());
}
}
在文本字段中,我可以使用"Alt Gr"键而不关闭弹出窗口.
In the text field I can use "Alt Gr" key without to close the popop.
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