//
// another example of the Java AWT, showing use of Dialog class.
// see class definition and main method for details.
//
import java.awt.* ;
import java.awt.event.* ;

//
// a DialogExample object is a CloseableFrame containing a Button
//      and a Label.  when the Button is pressed, a Dialog pops up
//      (modal or not depending on argument to constructor).  the
//      Dialog contains two Button objects; when one is pressed,
//      the Dialog displays the result in the Label and self-destructs.
//
class DialogExample extends CloseableFrame {

        Label display ;
        Dialog dlg ;

        DialogExample(boolean modal) {

                super("DialogExample") ;
                setLayout(new BorderLayout()) ;

                makeDialog(modal) ;

                display = new Label("", Label.CENTER) ;
                add(display, "North") ;

                Button b = new Button("press here for dialog") ;
                add(b, "South") ;
                // action to be performed when button is pressed --
                //      show dialog, and also print to standard output
                //      to confirm that button was pressed.  note
                //      that if dialog is modal, nothing happens here
                //      until the user makes a selection from the
                //      dialog.
                b.addActionListener( new ActionListener() {
                        public void actionPerformed(ActionEvent e) {
                                System.out.println("button pressed") ;
                                setDisplay("no answer yet") ;
                                dlg.show() ;
                        }
                } ) ;

                pack() ;
                show() ;
        }

        // sets the text in the display.
        void setDisplay(String s) {
                display.setText(s) ;
        }

        // makes the requested dialog (a separate Window).
        void makeDialog(boolean modal) {
                dlg = new Dialog(this, "A dialog", modal) ;
                dlg.setLayout(new BorderLayout()) ;

                // put some text in the dialog window.
                Label dlgL = new Label(
                        "Daisy, Daisy, give me your answer, do:", 
                        Label.CENTER) ;
                dlg.add(dlgL, "Center") ;

                // add two buttons to the dialog window, grouped
                //      using a panel.
                Panel yn = new Panel() ;
                Button yes = new Button("yes") ;
                Button no = new Button("no") ;
                yn.add(yes) ;
                yn.add(no) ;
                dlg.add(yn, "South") ;

                // actions to be performed when dialog buttons are
                //      pressed -- modify display in original
                //      frame, and self-destruct.
                yes.addActionListener(new ActionListener() {
                        public void actionPerformed(ActionEvent e) {
                                setDisplay("answer is yes") ;
                                dlg.dispose() ;
                        }
                } ) ;
                no.addActionListener(new ActionListener() {
                        public void actionPerformed(ActionEvent e) {
                                setDisplay("answer is no") ;
                                dlg.dispose() ;
                        }
                } ) ;
                // note that we wait for original frame to show
                //      (pop up) the dialog.
                dlg.pack() ;
        }

        //
        // ---- main ---------------------------------------------------
        //
        // command-line argument is y/n (whether dialog is modal).
        //
        public static void main(String[] args) {

                if (args.length < 1) {
                        System.out.println("Argument is y/n") ;
                        System.exit(-1) ;
                }
                boolean modal = args[0].equals("y") ;

                DialogExample d = new DialogExample(modal) ;
        }
}