JPopupMenu有一組非常具體的操作要求,是的,它們確實會在外觀和感覺之間發生變化.

您可以做的是使用未經修飾的JFrame創建自己的彈出窗口.這里的技巧是模仿所需的彈出窗口,例如,當另一個組件獲得焦點時自動關閉,使用轉義鍵消除彈出窗口的功能…等等…

這只是提供概念驗證的簡單示例,我個人還為轉義鍵添加了鍵綁定,某種偵聽器界面,以允許搜索窗格請求關閉彈出窗口以及自動聚焦的功能窗口可見時的某些組件,但是那只是我…

import java.awt.BorderLayout;

import java.awt.EventQueue;

import java.awt.GridBagLayout;

import java.awt.Point;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.awt.event.WindowEvent;

import java.awt.event.WindowFocusListener;

import javax.swing.JButton;

import javax.swing.JComponent;

import javax.swing.JFrame;

import javax.swing.JList;

import javax.swing.JPanel;

import javax.swing.JScrollPane;

import javax.swing.JTextField;

import javax.swing.SwingUtilities;

import javax.swing.UIManager;

import javax.swing.UnsupportedLookAndFeelException;

public class TestPopup {

public static void main(String[] args) {

new TestPopup();

}

public TestPopup() {

EventQueue.invokeLater(new Runnable() {

@Override

public void run() {

try {

UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());

} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {

ex.printStackTrace();

}

JFrame frame = new JFrame("Testing");

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.add(new TestPane());

frame.pack();

frame.setLocationRelativeTo(null);

frame.setVisible(true);

}

});

}

public class TestPane extends JPanel {

private JButton show;

public TestPane() {

setLayout(new GridBagLayout());

show = new JButton("...");

show.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

PopupWindow window = new PopupWindow();

window.show(show, 0, show.getHeight());

}

});

add(show);

}

}

public class SearchPane extends JPanel {

private JList list;

private JTextField search;

public SearchPane() {

setLayout(new BorderLayout());

list = new JList();

list.setPrototypeCellValue("This is just a test");

list.setVisibleRowCount(20);

search = new JTextField(10);

add(new JScrollPane(list));

add(search, BorderLayout.SOUTH);

}

}

public class PopupWindow extends JFrame {

private SearchPane searchPane;

public PopupWindow() {

setUndecorated(true);

setDefaultCloseOperation(DISPOSE_ON_CLOSE);

addWindowFocusListener(new WindowFocusListener() {

@Override

public void windowGainedFocus(WindowEvent e) {

}

@Override

public void windowLostFocus(WindowEvent e) {

dispose();

}

});

searchPane = new SearchPane();

add(searchPane);

pack();

}

public void show(JComponent parent, int x, int y) {

Point point = new Point(x, y);

SwingUtilities.convertPointToScreen(point, parent);

setLocation(point);

setVisible(true);

}

}

}

總結

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