Insert JDialog before frameview or main frame

问题:

i want to add Jdialog before frameview...my frameview consist of my main page of application. i just want to add Jdialog which get password from user and then enter in the Main frame. can any one tell me how can i achieve this in java swing??

回答1:

MyMainPanel mainPanel = new MyMainPanel();
LoginPanel loginPanel = new LoginPanel();

JFrame mainApp = new JFrame();
mainApp.add( mainPanel );
mainApp.pack();
mainApp.setVisible(true);

JDialog dialog = new JDialog( mainApp, true );
dialog.add( loginPanel );
dialog.setVisible( true );

if( login.isAuthenticated() ) { // after dialog is dismissed we can set the user
    mainPanel.setAuthenticatedUser( loginPanel.getAuthenticatedUser() );
} else {
    System.exit(-1);
}

That will show a dialog in front of your main panel and the user won't be able to use it until they login because its modal, and your LoginPanel can force the user to login by not offering any other option but Login, Signup, etc.

回答2:

by reading

1) How to use Top-Level Containers

2) How to Make Dialogs with methods

• setModal

• ModalityTypes

• toFront

回答3:

You could use following constructors to make a JDialog parent-less

JDialog d = new JDialog((Dialog)null);

JDialog d = new JDialog((Window)null);

JDialog d = new JDialog((Frame)null);

Quick code sample :

public class TestFrame extends JFrame{
    public TestFrame(){
        setSize(100,200);
    }

    public static void main(String[] args) {
            //Using null constructor ( Since JDK 6)
        final JDialog loginDialog = new JDialog((Dialog)null);
            //just a button for demo
        JButton okButton = new JButton("Login");
        okButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent ae) {
                TestFrame test = new TestFrame();
                test.setVisible(true);
                loginDialog.dispose();
            }
        });
        loginDialog.getContentPane().add(okButton);
        loginDialog.pack();
        loginDialog.setVisible(true);
    }
}