/** 
  * Bandscope Receiver Applet 1.0.0 
    [UPDATE FREQUENCY SELECTOR AND UPDATE BUTTON]
  * @author Robert J Morton <robmorton@clara.net>
  * @version 13 March 2002, 22 March 2012
  * @copyright Robert J Morton (all rights reserved) */

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

class update {
  private static final int
    X = 395,  // x-coordinate of hold button on applet panel
    Y = 183,  // y-coordinate of hold button on applet panel
    W = 140,  // width of peak hold button 
    H = 30,   // height of peak hold button
    h = 15;   // label height

  private String Age = "";  // age of latest scan data for selected band
  private JLabel AgeLabel;  // label on which the above is displayed
  private msgpanel mp;      // instance reference of the message panel object
  private loader ld;        // instance reference of the loader object

  update(bs cp, msgpanel mp) {
    this.mp = mp;  // instance reference of message panel object

    int y = Y;  /* set the y-coordinate to where the top of
                   the first Swing widget should be placed. */

    JLabel UpdtLab =                // create an "Update Trace" label
      new JLabel("Update trace...");
    cp.add(UpdtLab);                // add it to the applet's content pane
    UpdtLab.setBounds(X, y, W, h);  // set its position and size

    y += 18;  /* advance the y-coordinate to where the top of
                 the next Swing widget should be placed. */

    JComboBox<String> Update =    // create update frequency choice menu
      new JComboBox<String>();
    Update.addItem("on demand");  // enter its fixed text values
    Update.addItem("continuous"); 
    Update.addItem("every minute");
    Update.addItem("every 5 mins"); 
    Update.addItem("every 10 mins"); 
    Update.addItem("every 15 mins");
    Update.addItem("every 20 mins"); 
    Update.addItem("every 30 mins"); 
    Update.addItem("every hour");
    cp.add(Update);             // add it to the applet's content pane
    Update.setBounds(X,y,W,H);  // set its position and size

    // create a listener for this choice menu
    Update.addItemListener(new udchl(udchl.UPDATE, this));

    y += 39;  /* advance the y-coordinate to where the top of
                 the next Swing widget should be lpaced. */

    // create a blank label in which to show the age of the scan data
    AgeLabel = new JLabel("");
    cp.add(AgeLabel);                // add it to the main JPanel
    AgeLabel.setBounds(X, y, W, h);  // set its position and size

    y += 18;   /* advance the y-coordinate to where the top of
                  the next Swing widget should be lpaced. */

    // create the Pull button
    JButton PulBut = new JButton("Update Now");

    cp.add(PulBut);             // add it to the main JPanel
    PulBut.setBounds(X,y,W,H);  // set its position and size

    // create a listener for this button
    PulBut.addActionListener(new updatebl(updatebl.PULBUT, this));
  }

  // set the reference to the loader class instance
  void setLd(loader ld) {this.ld = ld;}

  // action to be taken when update choice made
  void selUpdate() {mp.showMsg("new update frequency selected", false);}

  // action to be taken when Pull button is pressed
  void pressPulBut() {
    if(false) {     // replace with server ack signal
      ld.post();    // send POST command to server to invoke a re-scan
    } else {
      mp.showMsg("RX port server currently unavailable.", true);
      ld.reload();  // trigger a delayed reload of current data
    }
  }

  // !!! THIS MUST BE DONE ON THE EVENT-DESPATCHING THREAD !!!
  void setAgeLabel(String Age) {AgeLabel.setText(Age);}
}



// LISTENS FOR EVENTS FROM THE BUTTONS
class updatebl implements ActionListener {
  static final int PULBUT = 0;  // 'Pull button pressed' event
  int id;                       // one of the above
  update ap;                    // the application that called

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

  public void actionPerformed(ActionEvent e){
    switch(id) {case PULBUT: ap.pressPulBut(); break;}
  }  // entered when PULL button has been pressed
}



/* LISTENS FOR EVENTS FROM THE CHOICE MENU SELECTORS: In this case, 
   an event from the 'update frequency selector' choice menu. */

class udchl implements ItemListener {
  static final int UPDATE = 0;
  int id;     // one of the above events
  update ap;  // the app that called: always the above app

  /* Constructor for a new Choice selection event. Sets the
  id number pertaining to this instance of 'cl' and then
  the reference to the instance of the 'bs' app from which
  it came. (there will only be one instance anyway). */

  public udchl(int id, update ap) {
    this.id = id;        
    this.ap = ap;        
  }                

  // a Choice selection event has occurred from checkbox 'id'
  public void itemStateChanged(ItemEvent e) {
    switch(id) {case UPDATE: ap.selUpdate(); break;}
  }  // Execute the method in the above applet which deals with this choice
}