// IE5.5+ PNG Alpha Fix v2.0 Alpha: Background Tiling Support
// (c) 2008 Angus Turnbull http://www.twinhelix.com

// This is licensed under the GNU LGPL, version 2.1 or later.
// For details, see: http://creativecommons.org/licenses/LGPL/2.1/

// IE6 Flicker fix
try { document.execCommand("BackgroundImageCache", false, true); } catch(err) {}

var IEPNGFix = window.IEPNGFix || {};

IEPNGFix.tileBG = function(elm, pngSrc, ready) {
	// Params: A reference to a DOM element, the PNG src file pathname, and a
	// hidden "ready-to-run" passed when called back after image preloading.

	var data = this.data[elm.uniqueID],
		elmW = Math.max(elm.clientWidth, elm.scrollWidth),
		elmH = Math.max(elm.clientHeight, elm.scrollHeight),
		bgX = elm.currentStyle.backgroundPositionX,
		bgY = elm.currentStyle.backgroundPositionY,
		bgR = elm.currentStyle.backgroundRepeat;

	// Cache of DIVs created per element, and image preloader/data.
	if (!data.tiles) {
		data.tiles = {
			elm: elm,
			src: '',
			cache: [],
			img: new Image(),
			old: {}
		};
	}
	var tiles = data.tiles,
		pngW = tiles.img.width,
		pngH = tiles.img.height;

	if (pngSrc) {
		if (!ready && pngSrc != tiles.src) {
			// New image? Preload it with a callback to detect dimensions.
			tiles.img.onload = function() {
				this.onload = null;
				IEPNGFix.tileBG(elm, pngSrc, 1);
			};
			return tiles.img.src = pngSrc;
		}
	} else {
		// No image?
		if (tiles.src) ready = 1;
		pngW = pngH = 0;
	}
	tiles.src = pngSrc;

	if (!ready && elmW == tiles.old.w && elmH == tiles.old.h &&
		bgX == tiles.old.x && bgY == tiles.old.y && bgR == tiles.old.r) {
		return;
	}

	// Convert English and percentage positions to pixels.
	var pos = {
			top: '0%',
			left: '0%',
			center: '50%',
			bottom: '100%',
			right: '100%'
		},
		x,
		y,
		pc;
	x = pos[bgX] || bgX;
	y = pos[bgY] || bgY;
	if (pc = x.match(/(\d+)%/)) {
		x = Math.round((elmW - pngW) * (parseInt(pc[1]) / 100));
	}
	if (pc = y.match(/(\d+)%/)) {
		y = Math.round((elmH - pngH) * (parseInt(pc[1]) / 100));
	}
	x = parseInt(x);
	y = parseInt(y);

	// Handle backgroundRepeat.
	var repeatX = { 'repeat': 1, 'repeat-x': 1 }[bgR],
		repeatY = { 'repeat': 1, 'repeat-y': 1 }[bgR];
	if (repeatX) {
		x %= pngW;
		if (x > 0) x -= pngW;
	}
	if (repeatY) {
		y %= pngH;
		if (y > 0) y -= pngH;
	}

	// Go!
	this.hook.enabled = 0;
	if (!({ relative: 1, absolute: 1 }[elm.currentStyle.position])) {
		elm.style.position = 'relative';
	}
	var count = 0,
		xPos,
		maxX = repeatX ? elmW : x + 0.1,
		yPos,
		maxY = repeatY ? elmH : y + 0.1,
		d,
		s,
		isNew;
	if (pngW && pngH) {
		for (xPos = x; xPos < maxX; xPos += pngW) {
			for (yPos = y; yPos < maxY; yPos += pngH) {
				isNew = 0;
				if (!tiles.cache[count]) {
					tiles.cache[count] = document.createElement('div');
					isNew = 1;
				}
				var clipR = (xPos + pngW > elmW ? elmW - xPos : pngW),
					clipB = (yPos + pngH > elmH ? elmH - yPos : pngH);
				d = tiles.cache[count];
				s = d.style;
				s.behavior = 'none';
				s.left = xPos + 'px';
				s.top = yPos + 'px';
				s.width = clipR + 'px';
				s.height = clipB + 'px';
				s.clip = 'rect(' +
					(yPos < 0 ? 0 - yPos : 0) + 'px,' +
					clipR + 'px,' +
					clipB + 'px,' +
					(xPos < 0 ? 0 - xPos : 0) + 'px)';
				s.display = 'block';
				if (isNew) {
					s.position = 'absolute';
					s.zIndex = -999;
					if (elm.firstChild) {
						elm.insertBefore(d, elm.firstChild);
					} else {
						elm.appendChild(d);
					}
				}
				this.fix(d, pngSrc, 0);
				count++;
			}
		}
	}
	while (count < tiles.cache.length) {
		this.fix(tiles.cache[count], '', 0);
		tiles.cache[count++].style.display = 'none';
	}

	this.hook.enabled = 1;

	// Cache so updates are infrequent.
	tiles.old = {
		w: elmW,
		h: elmH,
		x: bgX,
		y: bgY,
		r: bgR
	};
};


IEPNGFix.update = function() {
	// Update all PNG backgrounds.
	for (var i in IEPNGFix.data) {
		var t = IEPNGFix.data[i].tiles;
		if (t && t.elm && t.src) {
			IEPNGFix.tileBG(t.elm, t.src);
		}
	}
};
IEPNGFix.update.timer = 0;

if (window.attachEvent && !window.opera) {
	window.attachEvent('onresize', function() {
		clearTimeout(IEPNGFix.update.timer);
		IEPNGFix.update.timer = setTimeout(IEPNGFix.update, 100);
	});
}

// na laden van de pagina acties
window.addEvent('domready', function() {
	var footerafbeelding = new Element('div', {
		'id': 'footerafbeelding'
	});
	
	// input veld zoeken focus
	var zoek = $("zoek");
	zoek.onfocus = function() {
		if (this.value == 'Stel hier uw vraag') {
			this.value = '';
		}
	}
	zoek.onblur = function() {
		if (this.value == '') {
			this.value = 'Stel hier uw vraag';
		}
	}
	
	footerafbeelding.inject($("container"), "top");
	setFooter();
	setNieuwsbriefSubmit();
	setPrintKnop();
	setProjectUrl();
});

// resizen van de window
window.addEvent('resize', function() {
	setFooter();
});

// positionering van de footer balk + footer afbeelding
function setFooter() {
	// Viewport breedte ophalen (.getSize werkt niet in Chrome 1)
	var bodyElement = $(document.body);
	var bodyMargins = bodyElement.getStyle('margin-left').toInt() + bodyElement.getStyle('margin-right').toInt();
	var bodyPaddings = bodyElement.getStyle('padding-left').toInt() + bodyElement.getStyle('padding-right').toInt();
	var bodyBorders = bodyElement.getStyle('border-left').toInt() + bodyElement.getStyle('border-right').toInt();
	var bodyWidth = bodyElement.getStyle('width').toInt();
	var viewPortWidth = bodyMargins + bodyPaddings + bodyBorders + bodyWidth;

	// Ophalen benodigde info voor plaatsing
	var footerdiv = $("footer");
	footerdiv.style.width = 'auto';
	var footerafbeeldingdiv = $("footerafbeelding");
	var footer = footerdiv.getSize();
	var viewport = window.getSize();
	var container = $("container").getSize();
	var hoogteafbeelding = $("footerafbeelding").getSize();
	var left = (viewPortWidth/2)-(footer.x/2);	
	
	// de hoogte van container of viewport ophalen
	if (container.y > viewport.y) {
		var top = (container.y + 69); // 69 is margin-bottom van container	
	}
	else {		
		var top = (viewport.y + 5);
	}
	
	// footerbalk onderaan positioneren
	footerdiv.setStyles({
		left: left,
		top: top,
		width: viewPortWidth-left-2
	});	
	
	// afbeelding ook onderaan positioneren
	footerafbeeldingdiv.setStyles({
		top: top - hoogteafbeelding.y + footer.y						  
	});
}

// nieuwsbrief knop submit activeren
function setNieuwsbriefSubmit() {
	var schrijfin = $("schrijfin");
	
	if (schrijfin) {
		schrijfin.addEvent('click', function(e) {
			e.stop();
			document.forms.nieuwsbrief.submit();
			return true;
		});		
	}
}

// print knop voor <a class="print" id ="print">
function setPrintKnop() {
	var aprint = $("print");
	
	if (aprint) {
		aprint.addEvent('click', function(e) {
			e.stop();
			window.print();
			return true;
		});		
	}
}

// project overzicht pagina ul.projecten
// zet url op hele li blok
function setProjectUrl() {
	var projecten = $$("ul.projecten li");
	
	if (projecten.length > 0) {
		for (i = 0; i < projecten.length; i++) {
			projecten[i].addEvent('click', function (e) {
				e.stop();
				x = this.getElement('a');
				url = x.href;
				document.location = url;
			});
		}
	}
}