// ----------------------------------------------
// File:		BrowserUtils.js
// Author:		Nathan Derksen
// Description:	Class to provide access to some basic browser utilities 
// Example:
// var width = BrowserUtils.getBrowserWidth();
// ----------------------------------------------


// ----------------------------------------------
// Function:	BrowserUtils()
// Author:		Nathan Derksen
// Description:	Base class
// Inputs:		<None>
// Returns:		<Nothing>
// ----------------------------------------------
function BrowserUtils()
{
}

// ----------------------------------------------
// Function:	getBrowserWidth()
// Author:		Nathan Derksen
// Description:	Find out how wide the browser window is
// Inputs:		<None>
// Returns:		<Number>
// ----------------------------------------------
BrowserUtils.getBrowserWidth = function()
{
	var width = 0;
	
	if (typeof(innerWidth) == "number")
	{
		width = window.innerWidth;
	}
	else if (document.documentElement && document.documentElement.clientWidth)
	{
		width = document.documentElement.clientWidth;
	}
	else
	{
		width = document.body.clientWidth;
	}
	return width;
};

// ----------------------------------------------
// Function:	getBrowserHeight()
// Author:		Nathan Derksen
// Description:	Find out how tall the browser page is
// Inputs:		<None>
// Returns:		<Number>
// ----------------------------------------------
BrowserUtils.getBrowserHeight = function()
{
	var height = 0;
	
	if (typeof(innerHeight) == "number")
	{
		height = window.innerHeight;
	}
	else if (document.documentElement && document.documentElement.clientHeight)
	{
		height = document.documentElement.clientHeight;
	}
	else
	{
		height = document.body.clientHeight;
	}
	return height;
};

// ----------------------------------------------
// Function:	addOnLoadHandler()
// Author:		Nathan Derksen
// Description:	Add a function to a list of functions to be called when the page completes loading
// Inputs:		<Function> newHandler - The function to execute on page load
// Returns:		<Nothing>
// ----------------------------------------------
BrowserUtils.addOnLoadHandler = function(newHandler)
{
	try
	{
		if (window.onload)
		{
			if (newHandler)
			{
				var oldHandler = window.onload;
				window.onload = function()
				{
					oldHandler();
					newHandler();
				};
			}
		}
		else
		{
			window.onload = newHandler;
		}
	}
	catch (err)
	{
		Debug.error(err);
	}
};

// ----------------------------------------------
// ----------------------------------------------
BrowserUtils.getPosition = function(elementHandle)
{
	var currentLeft = currentTop = 0;
	if (elementHandle.offsetParent) 
	{
		currentLeft = elementHandle.offsetLeft;
		currentTop = elementHandle.offsetTop;
		while (elementHandle = elementHandle.offsetParent) 
		{
			currentLeft += elementHandle.offsetLeft;
			currentTop += elementHandle.offsetTop;
		}
	}
	return {left:currentLeft, top:currentTop};
};

// ----------------------------------------------
// ----------------------------------------------
BrowserUtils.getIsSecure = function()
{
	var pageLocation = window.location.href.toLowerCase();
	if (pageLocation.indexOf("https://") == 0)
	{
		return true;
	}
	return false;
}