/** 
  * Bandscope Receiver Applet 1.0.0
    [UPDATE FREQUENCY SELECTOR AND UPDATE BUTTON]
  * @author Robert J Morton <robmorton@clara.net> YE572246C
  * @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(Container cp, msgpanel mp) {  // CONSTRUCTOR
    this.mp = mp;  // instance reference of THE message panel object
    int y = Y;     // y-coordinate of the first Swing widget in this class

    /* create an "Update Trace" label, add it to the
    applet's content pane then set its position and size. */

    JLabel UpdtLab = new JLabel("Update trace...");
    cp.add(UpdtLab); UpdtLab.setBounds(X, y, W, h);

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

    /* Create the update frequency choice menu, enter its fixed text
    items, add it to the applet's content pane, set its position and 
    size then create a listener to detect selection events from it. */

    JComboBox<String> Update = new JComboBox<String>();
    Update.addItem("on demand"); 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); Update.setBounds(X,y,W,H);
    Update.addItemListener(new udchl(udchl.UPDATE,this));

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

    /* Create a blank label in which to show the age of the scan data,
    add it to the applet's content pane then set its position and size. */

    AgeLabel = new JLabel("");
    cp.add(AgeLabel); 
    AgeLabel.setBounds(X,y,W,h);

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

    /* Create the Update button, add it to the applet's content pane
    then set its position and size. Create a listener for this button. */

    JButton PulBut = new JButton("Update Now");
    cp.add(PulBut); PulBut.setBounds(X,y,W,H);
    PulBut.addActionListener(new updatebl(updatebl.PULBUT,this));
  }

  // set 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); }

  void pressPulBut() {  // action to be taken when Pull button is pressed
    if(false) {         // replace 'false' 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 'PULL' BUTTON
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: always the above applet!

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

  // The 'Pull' button has been clicked
  public void actionPerformed(ActionEvent e) {
    switch(id) { case PULBUT: ap.pressPulBut(); break; }
  }
}

// LISTENS FOR EVENTS FROM THE CHOICE MENU SELECTORS
class udchl implements ItemListener {

  static final int UPDATE = 0;  /* selected item number from the 'up-
                                date frequency selector' choice menu */

  int id;      //one of the above events
  update ap;   //the application that called: always the above applet!

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

  /* A Choice selection event has occurred from checkbox 'id', so exe-
  cute the method in the above applet which deals with this choice. */

  public void itemStateChanged(ItemEvent e) {
    switch(id) { case UPDATE: ap.selUpdate(); break; }
  }
}