// Global variables -------------------------------------------------------------------------------
var aspnm_expandedObjects = new Array();  // array of expanded groups
var aspnm_expandCount = 0;                // expanded group count


// Event handlers ---------------------------------------------------------------------------------

// Positions the subgroup for the given item, and initiates its expansion
function aspnm_itemMsOver(item, subGroup, expandDirection, horAdj, verAdj, expandDelay)
{
  var newLeft = 0;
  var newTop = 0;
  var oItem = document.getElementById(item);
  var oSubGroup = document.getElementById(subGroup);

  switch (expandDirection)
  {
    case 'belowleft':
      newLeft = aspnm_pageX(oItem);
      newTop = aspnm_pageY(oItem) + oItem.offsetHeight;
      break;
    case 'belowright':
      newLeft = aspnm_pageX(oItem) + oItem.offsetWidth - oSubGroup.offsetWidth;
      newTop =  aspnm_pageY(oItem) + oItem.offsetHeight;
      break;
    case 'aboveleft':
      newLeft = aspnm_pageX(oItem);
      newTop =  aspnm_pageY(oItem) - oSubGroup.offsetHeight;
      break;
    case 'aboveright':
      newLeft = aspnm_pageX(oItem) + oItem.offsetWidth - oSubGroup.offsetWidth;
      newTop =  aspnm_pageY(oItem) - oSubGroup.offsetHeight;
      break;
    case 'rightdown':
      newLeft = aspnm_pageX(oItem) + oItem.offsetWidth;
      newTop = aspnm_pageY(oItem);
      break;
    case 'rightup':
      newLeft = aspnm_pageX(oItem) + oItem.offsetWidth;
      newTop = aspnm_pageY(oItem) - oSubGroup.offsetHeight + oItem.offsetHeight;
      break;
    case 'leftdown':
      newLeft = aspnm_pageX(oItem) - oSubGroup.offsetWidth;
      newTop = aspnm_pageY(oItem);
      break;
    case 'leftup':
      newLeft = aspnm_pageX(oItem) - oSubGroup.offsetWidth;
      newTop = aspnm_pageY(oItem) - oSubGroup.offsetHeight + oItem.offsetHeight;
      break;
    default:
      newLeft = aspnm_pageX(oItem) + oItem.offsetWidth;
      newTop = aspnm_pageY(oItem);
      break;
  }

  newLeft += horAdj;
  if (verAdj < 0) newTop += verAdj;
  oSubGroup.style.left = newLeft;
  oSubGroup.style.top = newTop;

  aspnm_expand(subGroup);
}

// If the mouse pointer is not over the given item or its subGroup,
// this function initiates the collapse of the subGroup.
function aspnm_itemMsOut(item, group, subGroup, expandDelay, evt)
{
  if (!(aspnm_isMouseOnObject(subGroup, evt)))
    aspnm_collapse(subGroup);
}

// Not needed if expand delay is not implemented.
function aspnm_groupMsOver(group)
{

}

// If the mouse pointer is on the given group, its subGroup, or its parent item this function
// does nothing. If the pointer is over the parent group, but outside the parent item, then it
// initiates the collapse of itself and its subGroup (if any).
// Otherwise, the pointer is outside the menu structure and it initiates the collapse of all
// expanded objects.
function aspnm_groupMsOut(group, parentItem, parentGroup, expandDelay, evt)
{
  var subGroup = aspnm_expandedObjects[aspnm_expandCount];
  if (subGroup == group) subGroup = null;


  if (aspnm_isMouseOnObject(group, evt) || aspnm_isMouseOnObject(subGroup, evt) || aspnm_isMouseOnObject(parentItem, evt))
    ; //alert('do nothing');   // do nothing
  else if (aspnm_isMouseOnObject(parentGroup, evt))
  {
    aspnm_collapse(group);
    aspnm_collapse(subGroup);
  }
  else
  {
    aspnm_collapseAll();
  }
}

// Core functions ---------------------------------------------------------------------------------

// Expands the given menu group
function aspnm_expand(group)
{
  var oGroup = document.getElementById(group);
  if (oGroup.style.visibility != 'visible')
  {
    aspnm_hideSelectElements(group);
    oGroup.style.visibility = 'visible';
    aspnm_expandCount++;
    aspnm_expandedObjects[aspnm_expandCount] = group;
  }
}

// Collapses the given menu group
function aspnm_collapse(group)
{
  var oGroup = document.getElementById(group);
  if (group != null && group)
    if (oGroup.style.visibility != 'hidden')
    {
      oGroup.style.visibility = 'hidden';
      aspnm_expandCount--;
    }
  if (!(aspnm_contextUp) && aspnm_expandCount == 0)
    aspnm_restoreSelectElements();
}

// Collapses all expanded menu groups
function aspnm_collapseAll()
{
  for (var i = aspnm_expandCount; i >= 1; i--)
  {
    var oGroup = document.getElementById(aspnm_expandedObjects[i]);
    oGroup.style.visibility = 'hidden';
  }
  aspnm_expandCount = 0;
  if (!(aspnm_contextUp) && aspnm_expandCount == 0)
    aspnm_restoreSelectElements();
}

// Hides all menu groups prior to calling ClientSideOnClick event handler
function aspnm_hideAllGroups()
{
  aspnm_collapseAll();
}

// Utilities --------------------------------------------------------------------------------------

// Determines whether the mouse pointer is currently over the given object
function aspnm_isMouseOnObject(objName, evt)
{
  if (objName != null)
  {
    var obj = document.getElementById(objName);
    var objLeft = aspnm_pageX(obj) - 1;
    var objTop = aspnm_pageY(obj) - 1;
    var objRight = objLeft + obj.offsetWidth + 1;
    var objBottom = objTop + obj.offsetHeight + 1;

    if ((evt.pageX > objLeft) && (evt.pageX < objRight) &&
        (evt.pageY > objTop) && (evt.pageY < objBottom))
      return true;
    else
      return false;
  }
  else
    return false;
}

// Calculates the absolute page x coordinate of any element
function aspnm_pageX(element)
{
  var x = 0;
  do
  {
    if (element.style.position == 'absolute')
    {

      return x + element.offsetLeft;
    }
    else
    {
      x += element.offsetLeft;
      if (element.offsetParent)
        if (element.offsetParent.tagName == 'TABLE')
          if (parseInt(element.offsetParent.border) > 0)
          {
            x += 1;
          }
    }
  }
  while ((element = element.offsetParent));
  return x;
}

// Calculates the absolute page y coordinate of any element
function aspnm_pageY(element)
{
  var y = 0;
  do
  {
    if (element.style.position == 'absolute')
    {
      return y + element.offsetTop;
    }
    else
    {
      y += element.offsetTop;
      if (element.offsetParent)
        if (element.offsetParent.tagName == 'TABLE')
          if (parseInt(element.offsetParent.border) > 0)
          {
            y += 1;
          }
    }
  }
  while ((element = element.offsetParent));
  return y;
}


// Hides HTML select elements that are overlapping the given menu group
function aspnm_hideSelectElements(group)
{
  if (document.getElementsByTagName)
  {
    var arrElements = document.getElementsByTagName('select');
    if (aspnm_hideSelectElems)
      for (var i = 0; i < arrElements.length; i++)
        if (aspnm_objectsOverlapping(document.getElementById(group), arrElements[i]))
          arrElements[i].style.visibility = 'hidden';
  }
}

// Whether the given objects are overlapping
function aspnm_objectsOverlapping(obj1, obj2)
{
  var result = true;
  var obj1Left = aspnm_pageX(obj1);
  var obj1Top = aspnm_pageY(obj1);
  var obj1Right = obj1Left + obj1.offsetWidth;
  var obj1Bottom = obj1Top + obj1.offsetHeight;
  var obj2Left = aspnm_pageX(obj2);
  var obj2Top = aspnm_pageY(obj2);
  var obj2Right = obj2Left + obj2.offsetWidth;
  var obj2Bottom = obj2Top + obj2.offsetHeight;

  if (obj1Right <= obj2Left || obj1Bottom <= obj2Top ||
      obj1Left >= obj2Right || obj1Top >= obj2Bottom)
    result = false;
  return result;
}

// Restores all HTML select elements on the page
function aspnm_restoreSelectElements()
{
  if (document.getElementsByTagName)
  {
    var arrElements = document.getElementsByTagName('select');
    if (aspnm_hideSelectElems)
      for (var i = 0; i < arrElements.length; i++)
        arrElements[i].style.visibility = 'visible';
  }
}

// Positions the menu based on the alignment, offsetX, and offsetY properties
function aspnm_positionMenu(menu, alignment, offsetX, offsetY)
{
  if (aspnm_dragging) return false;
  var scrlLeft = window.pageXOffset;
  var scrlTop = window.pageYOffset;
  var clientW = window.innerWidth;
  var clientH = window.innerHeight;
  var menuWidth = menu.offsetWidth;
  var menuHeight = menu.offsetHeight;
  var newLeft = 0;
  var newTop = 0;

  switch (alignment)
  {
    case 'topleft':
      newLeft = scrlLeft;
      newTop = scrlTop;
      break;
    case 'topmiddle':
      newLeft = (clientW - menuWidth) / 2 + scrlLeft;
      newTop = scrlTop;
      break;
    case 'topright':
      newLeft = clientW + scrlLeft - menuWidth;
      newTop = scrlTop;
      break;
    case 'bottomleft':
      newLeft = scrlLeft;
      newTop = clientH + scrlTop - menuHeight;
      break;
    case 'bottommiddle':
      newLeft = (clientW - menuWidth) / 2 + scrlLeft;
      newTop = clientH + scrlTop - menuHeight;
      break;
    case 'bottomright':
      newLeft = clientW + scrlLeft - menuWidth;
      newTop = clientH + scrlTop - menuHeight;
      break;
    default:
      newLeft = clientW + scrlLeft;
      newTop = clientH + scrlTop;
      break;
  }

  newLeft += offsetX;
  newTop += offsetY;
  menu.style.left = newLeft;
  menu.style.top = newTop;
}