/*
************************************************************
  Keyboard support
    Keys:
      RIGHT Arrow  : Go to Next page
      LEFT Arrow   : Go to Previous page
      Page UP      : Go to Index page
      HOME         : Go to First page
      END          : Go to Last page
      S, s         : Toggle start/stop slide show (not in index)
      ESC          : Stop slide show (not in index)
      I, i         : Toggle exif info (not in index)
      H, h         : Toggle help tips
    Tested on: IE6, Mozilla 1.4, Netscape 7.1, Opera 7.2

    Bugs:
     - HOME,END doesn't work in Opera
************************************************************
*/

var takenAction = false;

//IE&Gecko Code
function IEGeckoKeyPress(oEvent) 
{
	if (!oEvent)
	    var oEvent = window.event;
	if (oEvent.keyCode)
	    myKeyCode = oEvent.keyCode;
	else if (oEvent.which)
	    myKeyCode = oEvent.which;

	if (oEvent.repeat || takenAction)
	    return;
	if (myKeyCode >= 16 && myKeyCode <= 18)
	    return;

	/*if (oEvent.shiftKey)
	    myKeyCode += 1000;
	if (oEvent.ctrlKey)
	    myKeyCode += 2000;
	if (oEvent.altKey)
	    myKeyCode += 4000;*/
	//alert(oEvent.type + "=" + myKeyCode);
	myKeyPress(myKeyCode);
}

function myKeyPress(myKeyCode) 
{
	switch (myKeyCode)
	{
		case 39:					// RIGHT Arrow
		case 107:					// NUM +
			if( hasRealNextPage )
			{
				takenAction = true;
				nextPage();
			}
			break;
		case 37:					// LEFT Arrow
		case 109:					// NUM -
			if( hasRealPrevPage )
			{
				takenAction = true;
				prevPage();
			}
			break;
		case 33: 					// Page UP
			takenAction = true;
			upPage();
			break;
		case 36:					// HOME
			takenAction = true;
			firstPage();
			break;
		case 35:					// END
			takenAction = true;
			lastPage();
			break;
		case 27:					// ESC
			if( isSlideShow )
			{
				// Only if i have slide show
				takenAction = true;
				dontSlides();
            	takenAction = false;
			}
			break;
		case 83:					// S, s
			if( isSlideShow )
			{
				// Only if i have slide show
				takenAction = true;
				toggleSlideShow();
            	takenAction = false;
			}
			break;
		case 73:					// I, i
			if( hasMetaData )
			{
				// Only if metadata exists
				takenAction = true;
				togglePhotographicMetaInformation();
            	takenAction = false;
			}
			break;
		case 72:					// H, h
			if( hasNavigationHelpTips )
			{
				// Only if help tips are ON
				takenAction = true;
				toggleNavigationHelpTips();
            	takenAction = false;
			}
			break;
		default:
			//alert("KeyCode: " + myKeyCode);
			break;
		}
}

function initKeyboard() 
{
	document.onkeydown = IEGeckoKeyPress;
}