Function signMenu

src/main/js/modules/signs/menu.js:67–174

(label, options, callback, selectedIndex)

signs.menu = signMenu;

function signMenu(label, options, callback, selectedIndex) {
  if (typeof selectedIndex == 'undefined') {
    selectedIndex = 0;
  }
  //
  // variables common to all instances of this menu can go here
  //
  var labelPadding = '---------------';
  var optionPadding = '              ';
  var i;
  var paddedLabel = (labelPadding + label + labelPadding).substr(
    (label.length + 30) / 2 - 7,
    15
  );
  var optLen = options.length;
  var displayOptions = [];
  for (i = 0; i < options.length; i++) {
    displayOptions[i] = (' ' + options[i] + optionPadding).substring(0, 15);
  }
  /*
   this function is returned by signs.menu and when it is invoked it will
   attach menu behaviour to an existing sign in the world.
   signs.menu is for use by Plugin Authors. 
   The function returned by signs.menu is for use by admins/ops.
   */
  var convertToMenuSign = function(/* Sign */ sign, save) {
    if (typeof save == 'undefined') {
      save = true;
    }
    //
    // per-sign variables go here
    //
    var cSelectedIndex = selectedIndex;
    setLine(sign, 0, paddedLabel.bold());
    var _updateSign = function(p_player, p_sign) {
      cSelectedIndex = (cSelectedIndex + 1) % optLen;
      _redrawMenuSign(p_sign, cSelectedIndex, displayOptions);
      var signSelectionEvent = {
        player: p_player,
        sign: p_sign,
        text: options[cSelectedIndex],
        number: cSelectedIndex
      };
      callback(signSelectionEvent);
    };

    /* 
     get a unique ID for this particular sign instance
     */
    var signLoc = sign.block.location;
    var menuSignSaveData = utils.locationToJSON(signLoc);
    var menuSignUID = JSON.stringify(menuSignSaveData);
    /*
     keep a reference to the update function for use by the event handler
     */
    _updaters[menuSignUID] = _updateSign;

    // initialize the sign