[英]How to trigger an action when clicking a disabled JMenuItem?
我在SO中做了一些谷歌搜索和查找,但是找到的所有示例都是针对启用JMenuItem
情况。
我要执行的操作的上下文是,我希望禁用的JMenuItem
(由于权限受限)在单击时显示一个弹出框,要求用户升级以便他们可以访问所述JMenuItem
。
以下是我目前所拥有的精简版本,命令行上未打印任何内容:
public class ExportMenuItem extends JMenuItem
{
public ExportMenuItem()
{
super("Menu Item Name");
addMouseListener(new MouseAdapter()
{
@Override
public void mouseClicked(MouseEvent mouseEvent)
{
if (!isEnabled())
{
JOptionPane.showMessageDialog(editor.getFrame(), "Hello world.");
System.out.println("Sys print hello.");
}
System.out.println("Sys print hello outside.");
}
});
}
}
这是你想要的?
import javax.swing.*;
import java.awt.event.*;
public class ExportMenuItem extends JMenuItem{
public ExportMenuItem(){
super("menu item");
addMouseListener(new MouseListener(){
@Override
public void mouseClicked(MouseEvent mouseEvent){
if (!isEnabled()) {
JOptionPane.showMessageDialog(null, "Upgrade me!");
}//end of if
}//end of mouseClicked
public void mouseExited(MouseEvent mouseEvent){}
public void mouseEntered(MouseEvent mouseEvent){}
public void mouseReleased(MouseEvent mouseEvent){}
public void mousePressed(MouseEvent mouseEvent){}
// And the remaining methods to implement...
});//end of anonymous class
}//end of constructor
public static void main(String[] a){
JFrame f = new JFrame();
JMenu menu = new JMenu("menu");
JMenuBar menuBar = new JMenuBar();
f.setJMenuBar(menuBar);
f.setSize(300, 300);
f.setVisible(true);
menuBar.add(menu);
JMenuItem item = new ExportMenuItem();
menu.add(item);
item.setEnabled(false);
}//end of main
}//end of class
也许是一种完全不同的方法,对用户而言更合乎逻辑:
在菜单项后面放置一个描述文字:
private void addRestartHint(JMenuItem m, String text) {
final String spaceholder = " ";
String t = m.getText() + spaceholder;
m.setLayout(new BorderLayout());
m.setText(t);
m.add(new JLabel(text), BorderLayout.EAST);
}
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