// selection.js - GetSelection function

function GetSelectionType( w)
{
  var nType = null;
  if ( w.getSelection)
    nType = 1;
  else 
  if ( w.document.getSelection)
    nType = 2;
  else 
  if ( w.document.selection)
    nType = 3;
  return nType;
}

function GetSelectionInWindow( w, nType)
{
  var sel = '';
  try
  {
    // Opera can work bad with frames: "Security error: attempted to read protected variable"
    switch ( nType)
    {
      case 1:
      {
        sel = w.getSelection();
        break;
      }
      case 2:
      {
        sel = w.document.getSelection();
        break;
      }
      case 3:
      {
        sel = w.document.selection.createRange().text;
        break;
      }
    }
  }
  catch ( e)
  {
  }
  if ( sel == null)
    sel = '';
  return sel;
}

function GetSelection( w, nType)
{
  if ( !w)
    w = window.top;
  if ( !nType)
    nType = GetSelectionType( w);

  var sel = GetSelectionInWindow( w, nType);

  if ( !IsSelection( sel))
  {
    var i = 0;
    try
    {
      i = w.frames.length;
    }
    catch ( e)
    {
      i = 0;
    }

    while( !IsSelection( sel) && ( i--))
    {
      sel = GetSelection( w.frames[i], nType);
    }
  }
  return sel;
}

function IsSelection( sel)
{
  if (( sel == '') || ( sel == null))
    return false;
  return true;
}

function ClearSelectionRange( sel)
{
  if ( IsSelection( sel))
  {
    if ( sel.getRangeAt)
    {
      var i = 0;
      for ( i = 0; i < sel.rangeCount; i++)
      {
        var range = sel.getRangeAt(i);
        range.collapse( false);
        //range.detach();
        ////range.deleteContents();
      }
    }
    else 
    { 
      // It is not working in Safari
      // range = document.createRange();
      // range.setStart( sel.anchorNode, sel.anchorOffset);
      // range.setEnd( sel.focusNode, sel.focusOffset);
    }
  }
}
function ClearSelectionInWindow( w, nType)
{
  try
  {
    // Opera can work bad with frames: "Security error: attempted to read protected variable"
    switch ( nType)
    {
      case 1:
      case 2:
      {
        var sel = GetSelectionInWindow( w, nType);
        ClearSelectionRange( sel);
        break;
      }
      case 3:
      {
        w.document.selection.empty();
        break;
      }
    }
  }
  catch ( e)
  {
  }
}

function ClearSelection( w, nType)
{
  if ( !w)
    w = window;
  if ( !nType)
    nType = GetSelectionType( w);
  
  ClearSelectionInWindow( w, nType);

  var i = 0;
  try
  {
    i = w.frames.length;
  }
  catch ( e)
  {
    i = 0;
  }

  while( i--)
  {
    ClearSelectionInWindow( w.frames[i], nType);
  }
}