防止在按ALT时关闭JPopupMenu

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 fromswingbits.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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