svgedit/archive/screencasts/svgopen2010/script.js

339 lines
8.6 KiB
JavaScript

(() => {
const doc = document;
const disableBuilds = true;
let ctr = 0;
const byId = function (id) {
if (typeof id === 'string') { return doc.getElementById(id); }
return id;
};
const query = function (qry, root) {
if (!qry) { return []; }
if (typeof qry !== 'string') { return [...qry]; }
if (typeof root === 'string') {
root = byId(root);
if (!root) { return []; }
}
root = root || document;
const rootIsDoc = (root.nodeType === 9);
const dcmnt = rootIsDoc ? root : (root.ownerDocument || document);
// rewrite the query to be ID rooted
if (!rootIsDoc || ('>~+'.includes(qry[0]))) {
root.id = root.id || ('qUnique' + (ctr++));
qry = '#' + root.id + ' ' + qry;
}
// don't choke on something like ".yada.yada >"
if ('>~+'.includes(qry.slice(-1))) { qry += ' *'; }
return [...dcmnt.querySelectorAll(qry)];
};
const ua = navigator.userAgent;
const isFF = Number.parseFloat(ua.split('Firefox/')[1]) || undefined;
const isWK = Number.parseFloat(ua.split('WebKit/')[1]) || undefined;
const isOpera = Number.parseFloat(ua.split('Opera/')[1]) || undefined;
const canTransition = (function () {
const ver = Number.parseFloat(ua.split('Version/')[1]) || undefined;
// test to determine if this browser can handle CSS transitions.
const cachedCanTransition =
(isWK || (isFF && isFF > 3.6) || (isOpera && ver >= 10.5));
return function () { return cachedCanTransition; };
})();
//
// Slide class
//
const Slide = function (node, idx) {
this._node = node;
if (idx >= 0) {
this._count = idx + 1;
}
if (this._node) {
this._node.classList.add('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 (state) {
if (typeof state !== 'string') {
state = this._states[state];
}
if (state === 'current' && !this._visited) {
this._visited = true;
this._makeBuildList();
}
this._node.classList.remove(...this._states);
this._node.classList.add(state);
this._currentState = state;
// delay first auto run. Really wish this were in CSS.
/*
this._runAutos();
*/
const that = this;
setTimeout(function () { that._runAutos(); }, 400);
},
_makeCounter () {
if (!this._count || !this._node) { return; }
const c = doc.createElement('span');
c.textContent = this._count;
c.className = 'counter';
this._node.append(c);
},
_makeBuildList () {
this._buildList = [];
if (disableBuilds) { return; }
if (this._node) {
this._buildList = query('[data-build] > *', this._node);
}
this._buildList.forEach(function (el) {
el.classList.add('to-build');
});
},
_runAutos () {
if (this._currentState !== 'current') {
return;
}
// find the next auto, slice it out of the list, and run it
let idx = -1;
this._buildList.some(function (n, i) {
if (n.hasAttribute('data-auto')) {
idx = i;
return true;
}
return false;
});
if (idx >= 0) {
const elem = this._buildList.splice(idx, 1)[0];
const transitionEnd = isWK ? 'webkitTransitionEnd' : (isFF ? 'mozTransitionEnd' : 'oTransitionEnd');
const that = this;
if (canTransition()) {
const l = function (evt) {
elem.parentNode.removeEventListener(transitionEnd, l);
that._runAutos();
};
elem.parentNode.addEventListener(transitionEnd, l);
elem.classList.remove('to-build');
} else {
setTimeout(function () {
elem.classList.remove('to-build');
that._runAutos();
}, 400);
}
}
},
buildNext () {
if (!this._buildList.length) {
return false;
}
this._buildList.shift().classList.remove('to-build');
return true;
}
};
//
// SlideShow class
//
const SlideShow = function (slides) {
this._slides = (slides || []).map(function (el, idx) {
return new Slide(el, idx);
});
const h = window.location.hash;
try {
this.current = Number.parseInt(h.split('#slide')[1]);
} catch (e) { /* squelch */ }
this.current = Number.isNaN(this.current) ? 1 : this.current;
const that = this;
doc.addEventListener('keydown',
function (e) { that.handleKeys(e); });
doc.addEventListener('mousewheel',
function (e) { that.handleWheel(e); });
doc.addEventListener('DOMMouseScroll',
function (e) { that.handleWheel(e); });
doc.addEventListener('touchstart',
function (e) { that.handleTouchStart(e); });
doc.addEventListener('touchend',
function (e) { that.handleTouchEnd(e); });
window.addEventListener('popstate',
function (e) { that.go(e.state); });
this._update();
};
SlideShow.prototype = {
_slides: [],
_update (dontPush) {
document.querySelector('#presentation-counter').textContent = 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 (let 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 () {
if (!this._slides[this.current - 1].buildNext()) {
this.current = Math.min(this.current + 1, this._slides.length);
this._update();
}
},
prev () {
this.current = Math.max(this.current - 1, 1);
this._update();
},
go (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 () {
const notesOn = this._notesOn = !this._notesOn;
query('.notes').forEach(function (el) {
el.style.display = (notesOn) ? 'block' : 'none';
});
},
switch3D () {
document.body.classList.toggle('three-d');
},
handleWheel (e) {
let 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 (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 (e) {
this._touchStartX = e.touches[0].pageX;
},
handleTouchEnd (e) {
const delta = this._touchStartX - e.changedTouches[0].pageX;
const SWIPE_SIZE = 150;
if (delta > SWIPE_SIZE) {
this.next();
} else if (delta < -SWIPE_SIZE) {
this.prev();
}
}
};
// Initialize
/* const slideshow = */ new SlideShow(query('.slide')); // eslint-disable-line no-new
document.querySelector('#toggle-counter').addEventListener('click', toggleCounter);
document.querySelector('#toggle-size').addEventListener('click', toggleSize);
document.querySelector('#toggle-transitions').addEventListener('click', toggleTransitions);
document.querySelector('#toggle-gradients').addEventListener('click', toggleGradients);
const counters = document.querySelectorAll('.counter');
const slides = document.querySelectorAll('.slide');
/**
* Show or hide the counters.
* @returns {void}
*/
function toggleCounter () {
[...counters].forEach(function (el) {
el.style.display = (el.offsetHeight) ? 'none' : 'block';
});
}
/**
* Add or remove `reduced` (size) class.
* @returns {void}
*/
function toggleSize () {
[...slides].forEach(function (el) {
if (!(/reduced/).test(el.className)) {
el.classList.add('reduced');
} else {
el.classList.remove('reduced');
}
});
}
/**
* Add or remove `no-transitions` class.
* @returns {void}
*/
function toggleTransitions () {
[...slides].forEach(function (el) {
if (!(/no-transitions/).test(el.className)) {
el.classList.add('no-transitions');
} else {
el.classList.remove('no-transitions');
}
});
}
/**
* Add or remove `no-gradients` class.
* @returns {void}
*/
function toggleGradients () {
[...slides].forEach(function (el) {
if (!(/no-gradients/).test(el.className)) {
el.classList.add('no-gradients');
} else {
el.classList.remove('no-gradients');
}
});
}
})();