作为我的软件开发文凭的一部分，我们必须创建一个 Java GUI 来管理足球联赛。我的小组已经制作了许多 JPanel，它们在我们放入 JTabbedPane 的点击原型中。到目前为止，这一直很好，我将它们移动到单独的文件和 MVC 布局中。
我正在使用一个窗口类来保存顶级 JFrame 和菜单栏，并在其中添加选项卡式窗格。这在构造函数中工作正常，但是当我从构造函数中删除它们并尝试通过Window.attachTabbedPanel(String name, JPanel panel)它从引导程序中添加它们时，它不会显示，但查询会tabbedPane.getTabCount()显示递增数量的选项卡。
这是一组精简的代码：Bootstrap 文件：
public class Bootstrap {
private Window mainWindow;
public Bootstrap() {
//Window class is our containing JFrame and JMenuBar
mainWindow = new Window();
//Load up our view classes
TestTab tab1 = new TestTab();
TestTab tab2 = new TestTab();
//Attach them
mainWindow.attachTabbedPanel("Tab1", tab1.getScreen());
mainWindow.attachTabbedPanel("Tab2", tab2.getScreen());
} // Bootstrap()
public gui.Window getWindow(){
return mainWindow;
}
} // Bootstrap
这由主文件调用：
public class Main {
public static void main(String[] args) {
Bootstrap RunMVC = new Bootstrap();
gui.Window mainWindow = RunMVC.getWindow();
mainWindow.run();
} // main()
} // Main
问题从 Window 类开始，我在选项卡中添加了一个In Constructor选项卡以检查我没有填满 tabbedPane，但此时它工作正常。
public class Window {
private JFrame frame;
private JMenuBar menuBarMain;
private JMenu mnFile;
private JTabbedPane tabbedPane;
private int count;
/**
* Create the application.
*/
public Window() {
//Build the frame
frame = new JFrame();
frame.setBounds(100, 100, 1280, 800);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().setLayout(new CardLayout(0, 0));
//End Build frame
TestTab conTab = new TestTab();
//Add the tabbed pane to hold the top level screens
tabbedPane = new JTabbedPane(JTabbedPane.TOP);
frame.getContentPane().add(tabbedPane, "name_1");
tabbedPane.addTab("In Consructor", conTab.getScreen());
count = 1;
}
public void attachTabbedPanel(String name, JPanel panel){
System.out.println("Window: adding Jpanel name: "+name);
System.out.println("panel is a: "+panel);
tabbedPane.addTab(name, panel);
tabbedPane.updateUI();
System.out.println("Number of tabs: "+tabbedPane.getTabCount());
System.out.println("Last Tab .isEnabledAt() "+tabbedPane.isEnabledAt(count++));
tabbedPane.updateUI();
}
/**
* Launch the window.
*/
public void run() {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
Window window = new Window();
window.frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
}
最后是小组：
public class TestTab {
private JPanel screen;
private JLabel lblSeason;
private JButton btnEdit;
private JLabel lblRounds;
public JPanel getScreen() {
return screen;
}
/**
* Initialize the contents of the frame.
*/
public TestTab() {
screen = new JPanel();
screen.setLayout(new MigLayout("", "[8%,right][10%,left][8%,right][10%,left][grow][50%]", "[][][grow]"));
lblSeason = new JLabel("Test");
screen.add(lblSeason, "flowx,cell 0 0");
btnEdit = new JButton("Edit Test");
screen.add(btnEdit, "cell 5 0,alignx right");
lblRounds = new JLabel("More Testing");
screen.add(lblRounds, "cell 0 1,alignx left");
}
}