/** 
  * Bandscope Receiver Applet 1.0.0 [CENTRE-FREQUENCY ENTRY FIELD]
  * @author Robert J Morton <robmorton@clara.net> YE572246C
  * @version 13 March 2002, 20 March 2012
  * @copyright Robert J Morton (all rights reserved) */

import java.awt.*;        // for graphics operations (GUI)
import javax.swing.*;     // swing widgets
import java.awt.event.*;  // for the new-fangled 1.1 event handling

class updown {
  private static final int
    CX = 230,  // x-coordinate of graph centre
    CY = 132,  // y-coordinate of graph centre
    D = 110,   // horizontal distance of the buttons from scope centre
    W = 25,    // width of a button
    H = 50;    // height of a button

  private int
    Y = CY - H/2;  // y-coordinate of the tops of the buttons

  private listeningon lo;

  private JButton
    DnBut,  // set up the Down button
    UpBut;  // set up the Up button


  updown(Container cp) {
    Font font = new Font("Serif",Font.BOLD,16);  // font for applet canvas
      
    DnBut = new JButton();  // set up the Down button
    cp.add(DnBut);
    DnBut.setBounds(CX - D - W,Y,W,H);
    DnBut.setMargin(new Insets(3,3,3,3));
    DnBut.setFont(font);
    DnBut.setText("-");
    DnBut.addActionListener(new updownbl(updownbl.DNBUT,this));

    UpBut = new JButton();  // set up the Up button
    cp.add(UpBut);
    UpBut.setBounds(CX + D,Y,W,H);
    UpBut.setMargin(new Insets(3,3,3,3));
    UpBut.setFont(font);
    UpBut.setText("+");
    UpBut.addActionListener(new updownbl(updownbl.UPBUT,this));
  }

   void setLo(listeningon lo) {this.lo = lo;}

   //action to be taken when Up button is pressed
   void pressUpBut() {lo.inchFreq( 1);}

   //action to be taken when Down button is pressed
   void pressDnBut() {lo.inchFreq(-1);}
}


class updownbl implements ActionListener {
   static final int UPBUT  = 0;  // 'Up button pressed' event
   static final int DNBUT  = 1;  // 'Down button pressed' event
   int id;     // one of the above
   updown ap;  // the application that called: always the above applet!

   // constructor for a new command
   public updownbl(int id, updown ap) { this.id = id; this.ap = ap; }

   // one of the buttons has been clicked
   public void actionPerformed(ActionEvent e) {
      switch(id) {  // id of this instance of ActionEvent
         case UPBUT: ap.pressUpBut(); break;  // it was the 'Up' button
         case DNBUT: ap.pressDnBut(); break;  // it was the 'Down' button
      }
   }
}