// xTooltipGroup, Copyright 2002-2006 Michael Foster (Cross-Browser.com)
// Part of X, a Cross-Browser Javascript Library, Distributed under the terms of the GNU LGPL

function xTooltipGroup(grpClassOrIdList, tipClass, origin, xOffset, yOffset, textList)
{
  //// Properties

  this.c = tipClass;
  this.o = origin;
  this.x = xOffset;
  this.y = yOffset;

  //// Constructor Code

  var i, tips;
  if (xStr(grpClassOrIdList)) {
    tips = xGetElementsByClassName(grpClassOrIdList);
    for (i = 0; i < tips.length; ++i) {
      tips[i].xTooltip = this;
    }
  }
  else {
    tips = new Array();
    for (i = 0; i < grpClassOrIdList.length; ++i) {
      tips[i] = xGetElementById(grpClassOrIdList[i]);
      if (!tips[i]) {
        alert('Element not found for id = ' + grpClassOrIdList[i]);
      }  
      else {
        tips[i].xTooltip = this;
        tips[i].xTooltipText = textList[i];
      }
    }
  }
  if (!xTooltipGroup.tipEle) { // only execute once
    var te = document.createElement("div");
    if (te) {
      te.setAttribute('id', 'xTooltipElement');
      te.setAttribute('style', 'position:absolute;visibility:hidden;');
      xTooltipGroup.tipEle = document.body.appendChild(te);
      xAddEventListener(document, 'mousemove', xTooltipGroup.docOnMousemove, false);
    }
  }
} // end xTooltipGroup ctor

//// Static Properties

xTooltipGroup.trgEle = null; // currently active trigger
xTooltipGroup.tipEle = null; // the tooltip element (all groups use the same element)

//// Static Method

xTooltipGroup.docOnMousemove = function(oEvent)
{
  var o, e = new xEvent(oEvent);
  if (e.target && (o = e.target.xTooltip)) {
    o.show(e.target, e.pageX, e.pageY);
  }
  else if (xTooltipGroup.trgEle) {
    xTooltipGroup.trgEle.xTooltip.hide();
  }
};

//// xTooltipGroup Public Methods

xTooltipGroup.prototype.show = function(trigEle, mx, my)
{
  if (xTooltipGroup.trgEle != trigEle) { // if not active or moved to an adjacent trigger
    xTooltipGroup.tipEle.className = trigEle.xTooltip.c;
    xTooltipGroup.tipEle.innerHTML = trigEle.xTooltipText ? trigEle.xTooltipText : trigEle.title;
    xTooltipGroup.trgEle = trigEle;
  }  
  var x, y, tipW, trgW, trgX;
  tipW = xWidth(xTooltipGroup.tipEle);
  trgW = xWidth(trigEle);
  trgX = xPageX(trigEle);
  switch(this.o) {
    case 'right':
      if (trgX + this.x + trgW + tipW < xClientWidth()) { x = trgX + this.x + trgW; }
      else { x = trgX - tipW - this.x; }
      y = xPageY(trigEle) + this.y;
      break;
    case 'top':
      x = trgX + this.x;
      y = xPageY(trigEle) - xHeight(trigEle) + this.y;
      break;
    case 'mouse':
      if (mx + this.x + tipW < xClientWidth()) { x = mx + this.x; }
      else { x = mx - tipW - this.x; }
      y = my + this.y;
      break;
  }
  xMoveTo(xTooltipGroup.tipEle, x, y);
  xShow(xTooltipGroup.tipEle);
};

xTooltipGroup.prototype.hide = function()
{
  xMoveTo(xTooltipGroup.tipEle, -1000, -1000);
  xTooltipGroup.trgEle = null;
};