我正在开发一个java项目,我使用了一些swing组件。我遇到了JMenuBar的问题。我有一个扩展JMenuBar的类。它是功能性的,它是每个JMenu对象和几个JMenuItems。问题是在我选择JMenu之后的某些情况下,它不会自动取消选择。例如,如果我选择JMenu(当选择JMenu时,其JMenuItems变得像列表一样可见)并按下键盘上的alt + tab,则JMenuBar的JFrame对象将被隐藏,但JMenu仍然停留在屏幕上。另一种情况是,当我选择一个JMenu并使用鼠标移动主JFrame时,框架会被移动,但JMenu不会被取消选择也不会移动,再次静止不动。我会把一些图像和我的代码更加解释。
这是在选择菜单后按下alt + tab的情况 - 这是不需要的:
http://i.imgur.com/0qL2pdD.png)
这是在选择JMenu后用鼠标右移动主JFrame的情况 - 这也是不需要的:
http://i.imgur.com/c0BL4dE.png
这是我的自定义JMenuBar类的源代码:
public class EOPLMenuBar extends JMenuBar{
private EOPLMenuBarListenerDelegate delegate;
public EOPLMenuBar(EOPLMenuBarListenerDelegate delegate){
this.delegate = delegate;
initEOPLMenuBar();
}
private void initEOPLMenuBar(){
// --- JMenu Initializations -------- //
JMenu eoplMenu = new JMenu("EOPL");
Font f = new Font(eoplMenu.getFont().getFontName(), Font.BOLD, eoplMenu.getFont().getSize());
eoplMenu.setFont(f);
eoplMenu.addMenuListener(new MenuListener() {
@Override
public void menuSelected(MenuEvent menuEvent) {
System.out.println("Menu selected");
//To change body of implemented methods use File | Settings | File Templates.
}
@Override
public void menuDeselected(MenuEvent menuEvent) {
System.out.println("Menu deselected");
}
@Override
public void menuCanceled(MenuEvent menuEvent) {
System.out.println("Menu canceled");
}
});
JMenu fileMenu = new JMenu("File");
JMenu examplesMenu = new JMenu("Examples");
this.add(eoplMenu);
this.add(fileMenu);
this.add(examplesMenu);
///------EOPLMenu items---------- ///
JMenuItem item1 = new JMenuItem(MenuItemType.ABOUT_EOPL_GUI.getName());
JMenuItem item2 = new JMenuItem(MenuItemType.SETTINGS.getName());
JMenuItem item3 = new JMenuItem(MenuItemType.QUIT_EOPL_GUI.getName());
eoplMenu.add(item1);
eoplMenu.addSeparator();
eoplMenu.add(item2);
eoplMenu.addSeparator();
eoplMenu.add(item3);
///------FileMenu items-----------///
JMenuItem item4 = new JMenuItem(MenuItemType.SAVE_FILE.getName());
fileMenu.add(item4);
///------ExampleMenu items -------///
JMenu letMenu = new JMenu("Proc");
JMenuItem item5 = new JMenuItem(MenuItemType.PROC_EXAMPLE_1.getName());
JMenuItem item6 = new JMenuItem(MenuItemType.PROC_EXAMPLE_2.getName());
letMenu.add(item5);
letMenu.add(item6);
JMenuItem item7 = new JMenuItem(MenuItemType.LET_EXAMPLE_1.getName());
JMenuItem item8 = new JMenuItem(MenuItemType.LET_EXAMPLE_2.getName());
JMenuItem item9 = new JMenuItem(MenuItemType.LETREC_EXAMPLE_1.getName());
JMenuItem item10 = new JMenuItem(MenuItemType.LETREC_EXAMPLE_2.getName());
JMenuItem item11 = new JMenuItem(MenuItemType.CALL_BY_NEED_EXAMPLE_1.getName());
JMenuItem item12 = new JMenuItem(MenuItemType.CALL_BY_NEED_EXAMPLE_2.getName());
JMenuItem item13 = new JMenuItem(MenuItemType.CALL_BY_REF_EXAMPLE_1.getName());
JMenuItem item14 = new JMenuItem(MenuItemType.CALL_BY_REF_EXAMPLE_2.getName());
examplesMenu.add(letMenu);
examplesMenu.add(item7);
examplesMenu.add(item8);
examplesMenu.add(item9);
examplesMenu.add(item10);
examplesMenu.add(item11);
examplesMenu.add(item12);
examplesMenu.add(item13);
examplesMenu.add(item14);
// -- Add ActionListeners to all items.
item1.addActionListener(new EOPLMenuBarListener(item1.getText()));
item2.addActionListener(new EOPLMenuBarListener(item2.getText()));
item3.addActionListener(new EOPLMenuBarListener(item3.getText()));
item4.addActionListener(new EOPLMenuBarListener(item4.getText()));
item5.addActionListener(new EOPLMenuBarListener(item5.getText()));
item6.addActionListener(new EOPLMenuBarListener(item6.getText()));
}
private class EOPLMenuBarListener implements ActionListener{
private String itemType;
public EOPLMenuBarListener(String type){
this.itemType = type;
}
@Override
public void actionPerformed(ActionEvent actionEvent) {
//To change body of implemented methods use File | Settings | File Templates.
if(itemType.equals(EOPLMenuBar.MenuItemType.LET_EXAMPLE_1.getName())){
delegate.prepareUIWithExampleSourcecode("let x = -(4,1) in -(x,1)","let");
}else if(itemType.equals(EOPLMenuBar.MenuItemType.LET_EXAMPLE_2.getName())){
delegate.prepareUIWithExampleSourcecode("let x = 3 in let x = -(x,1) in x","let");
}
}
}
public enum MenuItemType{
ABOUT_EOPL_GUI (String.format("%-15s","About EOPL-GUI")),
SETTINGS (String.format("%-15s","Settings")),
QUIT_EOPL_GUI (String.format("%-15s","Quit EOPL-GUI")),
SAVE_FILE (String.format("%-15s","Save File")),
LET_EXAMPLE_1 (String.format("%-15s","Let example-1")),
LET_EXAMPLE_2 (String.format("%-15s","Let example-2")),
PROC_EXAMPLE_1 (String.format("%-15s","Example 1")),
PROC_EXAMPLE_2 (String.format("%-15s","Example 2")),
LETREC_EXAMPLE_1 (String.format("%-15s","Letrec example-1")),
LETREC_EXAMPLE_2 (String.format("%-15s","Letrec example-2")),
CALL_BY_NEED_EXAMPLE_1 (String.format("%-15s","Call-by-need example-1")),
CALL_BY_NEED_EXAMPLE_2 (String.format("%-15s","Call-by-need example-2")),
CALL_BY_REF_EXAMPLE_1 (String.format("%-15s","Call-by-ref example-1")),
CALL_BY_REF_EXAMPLE_2 (String.format("%-15s","Call-by-ref example-2"));
private String name;
MenuItemType(String name){
this.name = name;
}
public String getName(){
return name;
}
}
}
这是我使用自定义JMenuBar的源代码:
private static void startGUIFrame(){
JFrame frame = new JFrame("EOPL GUI");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setResizable(true);
frame.setSize(900, 700);
frame.setLocationRelativeTo(null);
//Add content to the window.
frame.add(eoplPanel);
frame.setJMenuBar(new EOPLMenuBar(controller));
//Display the window.
frame.pack();
frame.setVisible(true);
}
我在谷歌搜索了几个小时,但没有运气。任何帮助表示赞赏。
答案 0 :(得分:0)
您的代码实际上没有任何问题。这是JMenuBar
实施中的错误。