slides.js

Requirement =====================================================================================

// S5 v1.1 slides.js -- released into the Public Domain
// Modified for Docutils (http://docutils.sf.net) by David Goodger
//
// Please see http://www.meyerweb.com/eric/tools/s5/credits.html for
// information about all the wonderful and talented contributors to this code!

var undef;
var slideCSS = '';
var snum = 0;
var smax = 1;
var slideIDs = new Array();
var incpos = 0;
var number = undef;
var s5mode = true;
var defaultView = 'slideshow';
var controlVis = 'visible';

var isIE = navigator.appName == 'Microsoft Internet Explorer' ? 1 : 0;
var isOp = navigator.userAgent.indexOf('Opera') > -1 ? 1 : 0;
var isGe = navigator.userAgent.indexOf('Gecko') > -1 && navigator.userAgent.indexOf('Safari') < 1 ? 1 : 0;

function hasClass(object, className) {
	if (!object.className) return false;
	return (object.className.search('(^|\\s)' + className + '(\\s|$)') != -1);
}

function hasValue(object, value) {
	if (!object) return false;
	return (object.search('(^|\\s)' + value + '(\\s|$)') != -1);
}

function removeClass(object,className) {
	if (!object) return;
	object.className = object.className.replace(new RegExp('(^|\\s)'+className+'(\\s|$)'), RegExp.$1+RegExp.$2);
}

function addClass(object,className) {
	if (!object || hasClass(object, className)) return;
	if (object.className) {
		object.className += ' '+className;
	} else {
		object.className = className;
	}
}

function GetElementsWithClassName(elementName,className) {
	var allElements = document.getElementsByTagName(elementName);
	var elemColl = new Array();
	for (var i = 0; i< allElements.length; i++) {
		if (hasClass(allElements[i], className)) {
			elemColl[elemColl.length] = allElements[i];
		}
	}
	return elemColl;
}

function isParentOrSelf(element, id) {
	if (element == null || element.nodeName=='BODY') return false;
	else if (element.id == id) return true;
	else return isParentOrSelf(element.parentNode, id);
}

function nodeValue(node) {
	var result = "";
	if (node.nodeType == 1) {
		var children = node.childNodes;
		for (var i = 0; i < children.length; ++i) {
			result += nodeValue(children[i]);
		}		
	}
	else if (node.nodeType == 3) {
		result = node.nodeValue;
	}
	return(result);
}

function slideLabel() {
	var slideColl = GetElementsWithClassName('*','slide');
	var list = document.getElementById('jumplist');
	smax = slideColl.length;
	for (var n = 0; n < smax; n++) {
		var obj = slideColl[n];

		var did = 'slide' + n.toString();
		if (obj.getAttribute('id')) {
			slideIDs[n] = obj.getAttribute('id');
		}
		else {
			obj.setAttribute('id',did);
			slideIDs[n] = did;
		}
		if (isOp) continue;

		var otext = '';
		var menu = obj.firstChild;
		if (!menu) continue; // to cope with empty slides
		while (menu && menu.nodeType == 3) {
			menu = menu.nextSibling;
		}
	 	if (!menu) continue; // to cope with slides with only text nodes

		var menunodes = menu.childNodes;
		for (var o = 0; o < menunodes.length; o++) {
			otext += nodeValue(menunodes[o]);
		}
		list.options[list.length] = new Option(n + ' : '  + otext, n);
	}
}

function currentSlide() {
	var cs;
	var footer_nodes;
	var vis = 'visible';
	if (document.getElementById) {
		cs = document.getElementById('currentSlide');
		footer_nodes = document.getElementById('footer').childNodes;
	} else {
		cs = document.currentSlide;
		footer = document.footer.childNodes;
	}
	cs.innerHTML = '<span id="csHere">' + snum + '<\/span> ' + 
		'<span id="csSep">\/<\/span> ' + 
		'<span id="csTotal">' + (smax-1) + '<\/span>';
	if (snum == 0) {
		vis = 'hidden';
	}
	cs.style.visibility = vis;
	for (var i = 0; i < footer_nodes.length; i++) {
		if (footer_nodes[i].nodeType == 1) {
			footer_nodes[i].style.visibility = vis;
		}
	}		
}

function go(step) {
	if (document.getElementById('slideProj').disabled || step == 0) return;
	var jl = document.getElementById('jumplist');
	var cid = slideIDs[snum];
	var ce = document.getElementById(cid);
	if (incrementals[snum].length > 0) {
		for (var i = 0; i < incrementals[snum].length; i++) {
			removeClass(incrementals[snum][i], 'current');
			removeClass(incrementals[snum][i], 'incremental');
		}
	}
	if (step != 'j') {
		snum += step;
		lmax = smax - 1;
		if (snum > lmax) snum = lmax;
		if (snum < 0) snum = 0;
	} else
		snum = parseInt(jl.value);
	var nid = slideIDs[snum];
	var ne = document.getElementById(nid);
	if (!ne) {
		ne = document.getElementById(slideIDs[0]);
		snum = 0;
	}
	if (step < 0) {incpos = incrementals[snum].length} else {incpos = 0;}
	if (incrementals[snum].length > 0 && incpos == 0) {
		for (var i = 0; i < incrementals[snum].length; i++) {
			if (hasClass(incrementals[snum][i], 'current'))
				incpos = i + 1;
			else
				addClass(incrementals[snum][i], 'incremental');
		}
	}
	if (incrementals[snum].length > 0 && incpos > 0)
		addClass(incrementals[snum][incpos - 1], 'current');
	ce.style.visibility = 'hidden';
	ne.style.visibility = 'visible';
	jl.selectedIndex = snum;
	currentSlide();
	number = 0;
}

function goTo(target) {
	if (target >= smax || target == snum) return;
	go(target - snum);
}

function subgo(step) {
	if (step > 0) {
		removeClass(incrementals[snum][incpos - 1],'current');
		removeClass(incrementals[snum][incpos], 'incremental');
		addClass(incrementals[snum][incpos],'current');
		incpos++;
	} else {
		incpos--;
		removeClass(incrementals[snum][incpos],'current');
		addClass(incrementals[snum][incpos], 'incremental');
		addClass(incrementals[snum][incpos - 1],'current');
	}
}

function toggle() {
	var slideColl = GetElementsWithClassName('*','slide');
	var slides = document.getElementById('slideProj');
	var outline = document.getElementById('outlineStyle');
	if (!slides.disabled) {
		slides.disabled = true;
		outline.disabled = false;
		s5mode = false;
		fontSize('1em');
		for (var n = 0; n < smax; n++) {
			var slide = slideColl[n];
			slide.style.visibility = 'visible';
		}
	} else {
		slides.disabled = false;
		outline.disabled = true;
		s5mode = true;
		fontScale();
		for (var n = 0; n < smax; n++) {
			var slide = slideColl[n];
			slide.style.visibility = 'hidden';
		}
		slideColl[snum].style.visibility = 'visible';
	}
}

function showHide(action) {
	var obj = GetElementsWithClassName('*','hideme')[0];
	switch (action) {
	case 's': obj.style.visibility = 'visible'; break;
	case 'h': obj.style.visibility = 'hidden'; break;
	case 'k':
		if (obj.style.visibility != 'visible') {
			obj.style.visibility = 'visible';
		} else {
			obj.style.visibility = 'hidden';
		}
	break;
	}
}

// 'keys' code adapted from MozPoint (http://mozpoint.mozdev.org/)
function keys(key) {
	if (!key) {
		key = event;
		key.which = key.keyCode;
	}
	if (key.which == 84) {
		toggle();
		return;
	}
	if (s5mode) {
		switch (key.which) {
			case 10: // return
			case 13: // enter
				if (window.event && isParentOrSelf(window.event.srcElement, 'controls')) return;
				if (key.target && isParentOrSelf(key.target, 'controls')) return;
				if(number != undef) {
					goTo(number);
					break;
				}
			case 32: // spacebar
			case 34: // page down
			case 39: // rightkey
			case 40: // downkey
				if(number != undef) {
					go(number);
				} else if (!incrementals[snum] || incpos >= incrementals[snum].length) {
					go(1);
				} else {
					subgo(1);
				}
				break;
			case 33: // page up
			case 37: // leftkey
			case 38: // upkey
				if(number != undef) {
					go(-1 * number);
				} else if (!incrementals[snum] || incpos <= 0) {
					go(-1);
				} else {
					subgo(-1);
				}
				break;
			case 36: // home