/*************************************************************************
  
  dw_tooltip.js
  version date: July 2003
  requires: dw_event.js and dw_viewport.js
  
  This code is from Dynamic Web Coding 
  at http://www.dyn-web.com/
  Copyright 2003 by Sharon Paine 
  See Terms of Use at http://www.dyn-web.com/bus/terms.html
  Permission granted to use this code 
  as long as this entire notice is included.

*************************************************************************/

var Tooltip = {
  followMouse: true,
  offX: 8,
  offY: 12,
  
  ready: false,
  t1: null,
  t2: null,
  tipID: "HelpTip",
  tip: null,
  
  init: function() {
    if ( document.createElement && document.body && typeof document.body.appendChild != "undefined" ) {
      var el = document.createElement("DIV");
      el.className = "tooltip";
      el.id = this.tipID;
      el.name = this.tipID;
      document.body.appendChild(el);
      this.ready = true;
    }
  },
  
  show: function(e, msg) {
    if (this.t1) clearTimeout(this.t1); 
    if (this.t2) clearTimeout(this.t2); 
    this.tip = document.getElementById( this.tipID );
    // set up mousemove 
    if (this.followMouse) 
      dw_event.add( document, "mousemove", this.trackMouse, true );
    this.writeTip(msg);
    viewport.getAll();
    this.positionTip(e);
    this.t1 = setTimeout("document.getElementById('" + this.tipID + "').style.visibility = 'visible'",200); 
    },
    
    writeTip: function(msg) {
      if ( this.tip && typeof this.tip.innerHTML != "undefined" ) this.tip.innerHTML = msg;
    },
    
    positionTip: function(e) {
      var x, y;
      e = dw_event.DOMit(e);

      if ( e.clientX + this.tip.offsetWidth + this.offX > viewport.width )
        x = e.clientX - this.tip.offsetWidth - this.offX + viewport.scrollX;
      else x = e.clientX + viewport.scrollX + this.offX;
      
      if ( e.clientY + this.tip.offsetHeight + this.offY > viewport.height )
        y = viewport.height + viewport.scrollY - this.tip.offsetHeight;
      else y = e.clientY + viewport.scrollY + this.offY;
      
      this.tip.style.left = x + "px"; this.tip.style.top = y + "px";
    },
    
    hide: function() {
      if (this.t1) clearTimeout(this.t1); 
      if (this.t2) clearTimeout(this.t2); 
      this.t2 = setTimeout("document.getElementById('" + this.tipID + "').style.visibility = 'hidden'",200);
      // release mousemove
      if (this.followMouse) 
        dw_event.remove( document, "mousemove", this.trackMouse, true );
      this.tip = null;
    },
    
    trackMouse: function(e) {
      e = dw_event.DOMit(e);
      Tooltip.positionTip(e); 
    }

}