<krpano><action autorun="preinit" type="js" protect="true"><![CDATA[
	
	var wakelock_support = false;
	var wakelock_handle = null;
	
	if (navigator && navigator.wakeLock && navigator.wakeLock.request)
	{
		wakelock_support = true;
	}
	
	function wakelock_api(enable)
	{
		if (enable && wakelock_support)
		{
			if (wakelock_handle == null)
			{
				try
				{
					var wakelock_promise = navigator.wakeLock.request('screen');
					
					if (wakelock_promise && wakelock_promise.then)
					{
						wakelock_promise.then( function(handle)
						{
							if (handle)
							{
								wakelock_handle = handle;
								wakelock_handle.addEventListener('release', function(){ wakelock_handle = null; });
							}
						}).catch(function(err)
						{
							krpano.trace(2,"Wakelock Error:" + err);
						});
					}
				}
				catch(err)
				{
					krpano.trace(2,"Wakelock Error:" + err);
				}
			}
		}
		else	// disable wakelock
		{
			if (wakelock_handle)
			{
				wakelock_handle.release();
				wakelock_handle = null;
			}
		}
	}
	
	
	// krpano API
	
	krpano.wakelocksupport = wakelock_support;

	krpano.requestwakelock = function()
	{
		wakelock_api(true);
	}
	
	krpano.releasewakelock = function()
	{
		wakelock_api(false);
	}
	
]]></action></krpano>