svgedit/screencasts/svgopen2010/script.js

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JavaScript
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/* eslint-disable no-var */
(function () {
var doc = document;
var disableBuilds = true;
var ctr = 0;
var spaces = /\s+/, a1 = [''];
var toArray = function (list) {
return Array.prototype.slice.call(list || [], 0);
};
var byId = function (id) {
if (typeof id === 'string') { return doc.getElementById(id); }
return id;
};
var query = function (query, root) {
if (!query) { return []; }
if (typeof query !== 'string') { return toArray(query); }
if (typeof root === 'string') {
root = byId(root);
if (!root) { return []; }
}
root = root || document;
var rootIsDoc = (root.nodeType === 9);
var doc = rootIsDoc ? root : (root.ownerDocument || document);
// rewrite the query to be ID rooted
if (!rootIsDoc || ('>~+'.indexOf(query.charAt(0)) >= 0)) {
root.id = root.id || ('qUnique' + (ctr++));
query = '#' + root.id + ' ' + query;
}
// don't choke on something like ".yada.yada >"
if ('>~+'.indexOf(query.slice(-1)) >= 0) { query += ' *'; }
return toArray(doc.querySelectorAll(query));
};
var strToArray = function (s) {
if (typeof s === 'string' || s instanceof String) {
if (s.indexOf(' ') < 0) {
a1[0] = s;
return a1;
}
return s.split(spaces);
}
return s;
};
var addClass = function (node, classStr) {
classStr = strToArray(classStr);
var cls = ' ' + node.className + ' ';
for (var i = 0, len = classStr.length, c; i < len; ++i) {
c = classStr[i];
if (c && cls.indexOf(' ' + c + ' ') < 0) {
cls += c + ' ';
}
}
node.className = cls.trim();
};
var removeClass = function (node, classStr) {
var cls;
if (classStr !== undefined) {
classStr = strToArray(classStr);
cls = ' ' + node.className + ' ';
for (var i = 0, len = classStr.length; i < len; ++i) {
cls = cls.replace(' ' + classStr[i] + ' ', ' ');
}
cls = cls.trim();
} else {
cls = '';
}
if (node.className !== cls) {
node.className = cls;
}
};
var toggleClass = function (node, classStr) {
var cls = ' ' + node.className + ' ';
if (cls.indexOf(' ' + classStr.trim() + ' ') >= 0) {
removeClass(node, classStr);
} else {
addClass(node, classStr);
}
};
var ua = navigator.userAgent;
var isFF = parseFloat(ua.split('Firefox/')[1]) || undefined;
var isWK = parseFloat(ua.split('WebKit/')[1]) || undefined;
var isOpera = parseFloat(ua.split('Opera/')[1]) || undefined;
var canTransition = (function () {
var ver = parseFloat(ua.split('Version/')[1]) || undefined;
// test to determine if this browser can handle CSS transitions.
var cachedCanTransition =
(isWK || (isFF && isFF > 3.6) || (isOpera && ver >= 10.5));
return function () { return cachedCanTransition; };
})();
//
// Slide class
//
var Slide = function (node, idx) {
this._node = node;
if (idx >= 0) {
this._count = idx + 1;
}
if (this._node) {
addClass(this._node, 'slide distant-slide');
}
this._makeCounter();
this._makeBuildList();
};
Slide.prototype = {
_node: null,
_count: 0,
_buildList: [],
_visited: false,
_currentState: '',
_states: [ 'distant-slide', 'far-past',
'past', 'current', 'future',
'far-future', 'distant-slide' ],
setState: function (state) {
if (typeof state !== 'string') {
state = this._states[state];
}
if (state === 'current' && !this._visited) {
this._visited = true;
this._makeBuildList();
}
removeClass(this._node, this._states);
addClass(this._node, state);
this._currentState = state;
// delay first auto run. Really wish this were in CSS.
/*
this._runAutos();
*/
var _t = this;
setTimeout(function () { _t._runAutos(); }, 400);
},
_makeCounter: function () {
if (!this._count || !this._node) { return; }
var c = doc.createElement('span');
c.innerHTML = this._count;
c.className = 'counter';
this._node.appendChild(c);
},
_makeBuildList: function () {
this._buildList = [];
if (disableBuilds) { return; }
if (this._node) {
this._buildList = query('[data-build] > *', this._node);
}
this._buildList.forEach(function (el) {
addClass(el, 'to-build');
});
},
_runAutos: function () {
if (this._currentState !== 'current') {
return;
}
// find the next auto, slice it out of the list, and run it
var idx = -1;
this._buildList.some(function (n, i) {
if (n.hasAttribute('data-auto')) {
idx = i;
return true;
}
return false;
});
if (idx >= 0) {
var elem = this._buildList.splice(idx, 1)[0];
var transitionEnd = isWK ? 'webkitTransitionEnd' : (isFF ? 'mozTransitionEnd' : 'oTransitionEnd');
var _t = this;
if (canTransition()) {
var l = function (evt) {
elem.parentNode.removeEventListener(transitionEnd, l, false);
_t._runAutos();
};
elem.parentNode.addEventListener(transitionEnd, l, false);
removeClass(elem, 'to-build');
} else {
setTimeout(function () {
removeClass(elem, 'to-build');
_t._runAutos();
}, 400);
}
}
},
buildNext: function () {
if (!this._buildList.length) {
return false;
}
removeClass(this._buildList.shift(), 'to-build');
return true;
}
};
//
// SlideShow class
//
var SlideShow = function (slides) {
this._slides = (slides || []).map(function (el, idx) {
return new Slide(el, idx);
});
var h = window.location.hash;
try {
this.current = parseInt(h.split('#slide')[1], 10);
} catch (e) { /* squeltch */ }
this.current = isNaN(this.current) ? 1 : this.current;
var _t = this;
doc.addEventListener('keydown',
function (e) { _t.handleKeys(e); }, false);
doc.addEventListener('mousewheel',
function (e) { _t.handleWheel(e); }, false);
doc.addEventListener('DOMMouseScroll',
function (e) { _t.handleWheel(e); }, false);
doc.addEventListener('touchstart',
function (e) { _t.handleTouchStart(e); }, false);
doc.addEventListener('touchend',
function (e) { _t.handleTouchEnd(e); }, false);
window.addEventListener('popstate',
function (e) { _t.go(e.state); }, false);
this._update();
};
SlideShow.prototype = {
_slides: [],
_update: function (dontPush) {
document.querySelector('#presentation-counter').innerText = this.current;
if (history.pushState) {
if (!dontPush) {
history.pushState(this.current, 'Slide ' + this.current, '#slide' + this.current);
}
} else {
window.location.hash = 'slide' + this.current;
}
for (var x = this.current - 1; x < this.current + 7; x++) {
if (this._slides[x - 4]) {
this._slides[x - 4].setState(Math.max(0, x - this.current));
}
}
},
current: 0,
next: function () {
if (!this._slides[this.current - 1].buildNext()) {
this.current = Math.min(this.current + 1, this._slides.length);
this._update();
}
},
prev: function () {
this.current = Math.max(this.current - 1, 1);
this._update();
},
go: function (num) {
if (history.pushState && this.current !== num) {
history.replaceState(this.current, 'Slide ' + this.current, '#slide' + this.current);
}
this.current = num;
this._update(true);
},
_notesOn: false,
showNotes: function () {
var notesOn = this._notesOn = !this._notesOn;
query('.notes').forEach(function (el) {
el.style.display = (notesOn) ? 'block' : 'none';
});
},
switch3D: function () {
toggleClass(document.body, 'three-d');
},
handleWheel: function (e) {
var delta = 0;
if (e.wheelDelta) {
delta = e.wheelDelta / 120;
if (isOpera) {
delta = -delta;
}
} else if (e.detail) {
delta = -e.detail / 3;
}
if (delta > 0) {
this.prev();
return;
}
if (delta < 0) {
this.next();
}
},
handleKeys: function (e) {
if (/^(input|textarea)$/i.test(e.target.nodeName)) return;
switch (e.keyCode) {
case 37: // left arrow
this.prev(); break;
case 39: // right arrow
case 32: // space
this.next(); break;
case 50: // 2
this.showNotes(); break;
case 51: // 3
this.switch3D(); break;
}
},
_touchStartX: 0,
handleTouchStart: function (e) {
this._touchStartX = e.touches[0].pageX;
},
handleTouchEnd: function (e) {
var delta = this._touchStartX - e.changedTouches[0].pageX;
var SWIPE_SIZE = 150;
if (delta > SWIPE_SIZE) {
this.next();
} else if (delta < -SWIPE_SIZE) {
this.prev();
}
}
};
// Initialize
var slideshow = new SlideShow(query('.slide')); // eslint-disable-line no-unused-vars
document.querySelector('#toggle-counter').addEventListener('click', toggleCounter, false);
document.querySelector('#toggle-size').addEventListener('click', toggleSize, false);
document.querySelector('#toggle-transitions').addEventListener('click', toggleTransitions, false);
document.querySelector('#toggle-gradients').addEventListener('click', toggleGradients, false);
var counters = document.querySelectorAll('.counter');
var slides = document.querySelectorAll('.slide');
function toggleCounter () {
toArray(counters).forEach(function (el) {
el.style.display = (el.offsetHeight) ? 'none' : 'block';
});
}
function toggleSize () {
toArray(slides).forEach(function (el) {
if (!/reduced/.test(el.className)) {
addClass(el, 'reduced');
} else {
removeClass(el, 'reduced');
}
});
}
function toggleTransitions () {
toArray(slides).forEach(function (el) {
if (!/no-transitions/.test(el.className)) {
addClass(el, 'no-transitions');
} else {
removeClass(el, 'no-transitions');
}
});
}
function toggleGradients () {
toArray(slides).forEach(function (el) {
if (!/no-gradients/.test(el.className)) {
addClass(el, 'no-gradients');
} else {
removeClass(el, 'no-gradients');
}
});
}
})();