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/* 
To compile:
   nicec --classpath "niceswt.jar;swt.jar" -a helloswt.jar helloswt
To run:
   java -cp swt.jar;helloswt.jar helloswt.fun
*/

import nice.swt;
import nice.swt.events;
import nice.swt.layout;
import nice.swt.widgets;


void main(String[] args){
   makeHelloGoodbye().open;
}

HelloGoodbye makeHelloGoodbye(){
   let d = new Display();
   let s = new Shell(d, SWT.TITLE | SWT.CLOSE | SWT.BORDER);
   s.setLayout( new FillLayout(SWT.VERTICAL) );
   s.setText(" SWT Nice Hello/Goodbye ");
   s.setSize(200, 100);
   let b1 = new Button(s, SWT.PUSH);
   b1.setText("Hello");
   let b2 = new Button(s, SWT.PUSH);
   b2.setText("Goodbye");

   let v =  
      new HelloGoodbye(
         display: d,
         shell: s,
         helloButton: b1,
         goodbyeButton: b2
      );
   b1.addSelectionListener( v.helloButtonSelected );
   b2.addSelectionListener( v.goodbyeButtonSelected );

   return v;
} 

void open(HelloGoodbye v){
   v.shell.open;
   while (!v.shell.isDisposed) {
      if (!v.display.readAndDispatch) 
         v.display.sleep;
   }
   v.display.dispose;
}


//  Some prefer to separate the UI event 
//  handling from the UI initialization.

SelectionAdapter helloButtonSelected(HelloGoodbye v) =
   new SelectionAdapter( widgetSelected: SelectionEvent e => {
      if (v.helloIsReply) 
         v.helloButton.setText("Hello");
      else
         v.helloButton.setText("HELLO!");

      v.helloIsReply = ! v.helloIsReply;
      }
   );

SelectionAdapter goodbyeButtonSelected(HelloGoodbye v) =
   new SelectionAdapter( widgetSelected: SelectionEvent e => {
      if (v.goodbyeIsReply) 
         v.goodbyeButton.setText("Goodbye");
      else
         v.goodbyeButton.setText("Bye!");

      v.goodbyeIsReply = ! v.goodbyeIsReply;
      }
   );


class HelloGoodbye {
   Display display;
   Shell shell;
   Button helloButton;
   Button goodbyeButton;
   boolean helloIsReply = false;
   boolean goodbyeIsReply = false;
}