/////////////////////////////////////////////////////////////////// 
//
// scrollToolbar.js
// 
// Ensure the SharePoint HTML editor floating toolbar is always visible
//
// Copyright Vincent Rothwell 2007 http://blog.thekid.me.uk
//
///////////////////////////////////////////////////////////////////

var _tk_old_RTE2_GenerateToolBarHtml = null;
var _tk_old_RTE2_ShowToolbar = null;
var _tk_old_window_scroll = null;
var _tk_RTE2_Editors = new Array();

function _tk_switchRTE2_Functions()
{
    if (typeof(RTE2_ShowToolbar) != "undefined")
    {
    	_tk_old_RTE2_ShowToolbar = RTE2_ShowToolbar;
        _tk_old_RTE2_GenerateToolBarHtml = RTE2_GenerateToolBarHtml;
        RTE2_GenerateToolBarHtml = _tk_RTE2_GenerateToolBarHtml;
        RTE2_ShowToolbar = _tk_RTE2_ShowToolbar;
    }
    
    _tk_old_window_scroll = window.onscroll;
    window.onscroll = windowScrolled;
}

function _tk_RTE2_GenerateToolBarHtml(strBaseElementID, strWebLanguage, toolbarWidth, instanceVariables)
{
	_tk_RTE2_Editors.push(strBaseElementID);
	
	// Once the toolbar has been added ensure it is visible
	setTimeout("_tk_RTE2EnsureVisible('" + strBaseElementID + "')", 50);
	
	return _tk_old_RTE2_GenerateToolBarHtml(strBaseElementID, strWebLanguage, toolbarWidth, instanceVariables);
}

function _tk_RTE2_ShowToolbar(strBaseElementID)
{
	_tk_old_RTE2_ShowToolbar(strBaseElementID);

	// Ensure the toolbar is visible when it is re-displayed
	_tk_RTE2EnsureVisible(strBaseElementID); 
}

function windowScrolled()
{
	// Call any previous scrolling function
	if (_tk_old_window_scroll != null) _tk_old_window_scroll();

	// Are any edtors visible?
	for (var c=0; c<_tk_RTE2_Editors.length; c++)
	{
		var oToolbar = RTE2_GetToolbar(_tk_RTE2_Editors[c]);

		if (oToolbar != null)
		{
			if (oToolbar.style.display == "")
			{
				_tk_RTE2EnsureVisible(_tk_RTE2_Editors[c]);
				return; // Only one can be visible
			}
		}
	}
}

function _tk_RTE2EnsureVisible(strBaseElementID)
{
	var oToolbar = RTE2_GetToolbar(strBaseElementID);
	var oIFrame = RTE2_GetToolbarIFrame(strBaseElementID)

	// Is it off the top?
	if ( document.body.scrollTop > (oToolbar.parentNode.offsetTop + parseInt(oToolbar.style.top))+5)
	{
		var iTop = document.body.scrollTop - oToolbar.parentNode.offsetTop + 5;
		oToolbar.style.top = iTop;
		oIFrame.style.top = iTop;
	}
				
	// Is it off the bottom?
	if ( document.body.scrollTop + document.body.clientHeight < (oToolbar.parentNode.offsetTop + parseInt(oToolbar.style.top) + 70))
	{
		var iTop = document.body.scrollTop + document.body.clientHeight - 70 - oToolbar.parentNode.offsetTop;
		oToolbar.style.top = iTop;
		oIFrame.style.top = iTop;
	}
}

setTimeout("_tk_switchRTE2_Functions()", 100);