// tfmenu.js  ver 1.4
// http://www.kakura.jp/pg/tfmenu/
//
// Daisuke Kakura <info@kakura.jp> "2007-07-23 Mon 16:59:12 Cuzco, Peru"
// Some Rights Reserved under Creative Commons License.
// http://creativecommons.org/licenses/by/2.1/jp/

// 設定可能な変数 -----------------------------------------------------------------------
var expand_speed = 150;  // メニュー項目を開閉する速さ (ミリ秒)
var updown_speed =  20;  // メニューが移動する速さ (ミリ秒)
var steps        =  20;  // メニューが updown_speed ミリ秒ごとに移動するピクセル幅
var jump         =   1;  // メニューが離れすぎたら高速移動する (1: yes 0: no)
var sticky       =   0;  // メニューを固定する (1: yes 0: no)

// IE 以外のブラウザでメニューが移動するピクセル幅
// Firefox は IE よりなぜか遅いので、このピクセル幅を増やして対応する
var steps2       =  40;  // メニューが updown_speed ミリ秒ごとに移動するピクセル幅



// 設定可能な変数 ここまで  -------------------------------------------------------------

var curr_y;
var istimerc_on = 0;
var istimere_on = 0;
var limit_y;
var menu_pos = new Object();
var status_p;
var tfm_body;
var tfmenu;
var isInternetExplorer;

if (navigator.appName.indexOf("Microsoft") < 0) {
   // it's not IE.
   steps = steps2;
}

function expandMenu(e) {
   var close_only = 0;
   var col_elem;
   var exp_elem;
   var ic;
   var ie;
   var isopen = 0;
   var target_elem;
   var target_node;
   var timerc;
   var timere;

   var collapseItem = function() {
      if(col_elem[ic]) {
         setVisibility(col_elem[ic], "hidden");
         ic++;
      } else {
         clearInterval(timerc);
         istimerc_on = 0;
      }
   }
   var expandItem = function() {
      if(!istimerc_on) {
         if(exp_elem[ie]) {
            setVisibility(exp_elem[ie], "visible");
            ie++;
         } else {
            clearInterval(timere);
            istimere_on = 0;
         }
      }
   }

   if(e.target) {
      target_node = e.target;
   } else if (e.srcElement) {
      target_node = e.srcElement;
   }
   // for Safari.
   if (target_node.nodeType == 3) {
      target_node = target_node.parentNode;
   }
   target_elem = target_node.getElementsByTagName("div");
   // if a gap between items (background tfm_body) was clicked, ignore.
   if(target_node.id == "tfm-body") {
      return;
   }
   // if the top item was clicked and it was already open, just close it.
   if(target_elem[0]) {
      if(target_elem[0].style.visibility == "visible") {
         close_only = 1;
      }
   }
   // collapse menu.
   if(!istimerc_on && !istimere_on) {
      for(var i = 0; i < tfm_body.length && !isopen; ++i) { // search the first visible chiled item.
         col_elem = tfm_body[i].getElementsByTagName("div");
         for(var ii = 0; ii < col_elem.length; ++ii) {
            if(col_elem[ii].style.visibility == "visible") {
               isopen = 1;
               break;
            }
         }
      }
      if(isopen) {
         ic          = 0;
         istimerc_on = 1;
         timerc      = setInterval(collapseItem, expand_speed);
      }
   }
   // expand active menu items.
   if(!istimere_on && !close_only) {
      exp_elem    = target_elem;
      ie          = 0;
      istimere_on = 1;
      timere      = setInterval(expandItem, expand_speed);
   }
}

function setVisibility(e, value) {
   e.style.visibility = value;
   if(value == "hidden") {
      e.style.lineHeight     = "0px";
      e.parentNode.className = "tf1";
   } else {
      e.style.lineHeight     = "100%";
      e.parentNode.className = "tf1active";
   }
}

function setTopPos() {
   var target_y    = document.body.scrollTop;
// var suffix_y;
   var dance_steps = steps;
   var distance;
   var status;

   distance = Math.abs(target_y - curr_y);

   // if menu box was too far from active area, then speed up.
   if(jump && tfmenu.offsetHeight * 2 < distance) {
      dance_steps = steps * 10;
   }
   // slow down if it's getting closer.
   if(distance < 25) {
      dance_steps = 1;
   }
   // do not exceed the bottom of the parent element.
   if(limit_y <= target_y) {
      target_y = limit_y;
      curr_y   = limit_y;
   }
   // going up or donw?
   if(curr_y > target_y) {
      curr_y -= dance_steps; // ascending
      status = "tfm-up";
   } else if(curr_y < target_y) {
      curr_y += dance_steps; // descending
      status = "tfm-down";
   } else {
      status = "tfm-stop";
   }
   if(distance != 0) {
      tfmenu.style.top = curr_y + "px";
   }
   // change status (class name)
   if(status_p != status) {
      status_p = status;
      tfmenu.className = status;
   }
}

function setListeners(e) {
   var i;
   var ii;
   tfmenu           = document.getElementById("tfmenu");
   tfmenu.innerHTML = menu_html;
   tfm_body         = document.getElementById("tfm-body")
   tfmenu.className = "tfm-stop";
   addListener(tfm_body, 'mouseup', expandMenu, false);
   tfm_body         = tfm_body.childNodes;

   for(i = 0; i < tfm_body.length; ++i) {
      // if name property was set, make that node (id) to visible.
      var items = tfm_body[i].getElementsByTagName("div");
      var visib = "hidden";
      if(tfmenu.getAttribute('name') == tfm_body[i].id) {
         visib = "visible";
      }
      for(ii = 0; ii < items.length; ++ii) {
         setVisibility(items[ii], visib);
      }
   }

   tfmenu.style.position = "absolute";
   tfmenu.style.left     = "0px";
   if(sticky) {
      tfmenu.style.top = "0px";
   } else {
      curr_y           = document.body.scrollTop;
      tfmenu.style.top = curr_y + "px";
      setInterval("setTopPos()", updown_speed);
   }
   // bug: if there is no parent element, limit_y will be screen height which is too short.
   limit_y = tfmenu.parentNode.offsetHeight - tfmenu.offsetHeight;
}

function addListener(elem, eventType, func, cap) {
   if(elem.addEventListener) {
      elem.addEventListener(eventType, func, cap);
   } else if(elem.attachEvent) {
      elem.attachEvent('on' + eventType, func);
   } else {
      window.alert("Sorry... Please use Internet Explorer or Firefox.");
      return false;
   }
}

addListener(window, 'load', setListeners, false);

// eof