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var Alectryon;
(function(Alectryon) {
(function (slideshow) {
function anchor(sentence) { return "#" + sentence.id; }
function current_sentence() { return slideshow.sentences[slideshow.pos]; }
function unhighlight() {
var sentence = current_sentence();
if (sentence) sentence.classList.remove("alectryon-target");
slideshow.pos = -1;
}
function highlight(sentence) {
sentence.classList.add("alectryon-target");
}
function scroll(sentence) {
// Put the top of the current fragment close to the top of the
// screen, but scroll it out of view if showing it requires pushing
// the sentence past half of the screen. If sentence is already in
// a reasonable position, don't move.
var parent = sentence.parentElement;
/* We want to scroll the whole document, so start at root… */
while (parent && !parent.classList.contains("alectryon-root"))
parent = parent.parentElement;
/* … and work up from there to find a scrollable element.
parent.scrollHeight can be greater than parent.clientHeight
without showing scrollbars, so we add a 10px buffer. */
while (parent && parent.scrollHeight <= parent.clientHeight + 10)
parent = parent.parentElement;
/* <body> and <html> elements can have their client rect overflow
* the window if their height is unset, so scroll the window
* instead */
if (parent && (parent.nodeName == "BODY" || parent.nodeName == "HTML"))
parent = null;
var rect = function(e) { return e.getBoundingClientRect(); };
var parent_box = parent ? rect(parent) : { y: 0, height: window.innerHeight },
sentence_y = rect(sentence).y - parent_box.y,
fragment_y = rect(sentence.parentElement).y - parent_box.y;
// The assertion below sometimes fails for the first element in a block.
// console.assert(sentence_y >= fragment_y);
if (sentence_y < 0.1 * parent_box.height ||
sentence_y > 0.7 * parent_box.height) {
(parent || window).scrollBy(
0, Math.max(sentence_y - 0.5 * parent_box.height,
fragment_y - 0.1 * parent_box.height));
}
}
function highlighted(pos) {
return slideshow.pos == pos;
}
function navigate(pos, inhibitScroll) {
unhighlight();
slideshow.pos = Math.min(Math.max(pos, 0), slideshow.sentences.length - 1);
var sentence = current_sentence();
highlight(sentence);
if (!inhibitScroll)
scroll(sentence);
}
var keys = {
PAGE_UP: 33,
PAGE_DOWN: 34,
ARROW_UP: 38,
ARROW_DOWN: 40,
h: 72, l: 76, p: 80, n: 78
};
function onkeydown(e) {
e = e || window.event;
if (e.ctrlKey) {
if (e.keyCode == keys.ARROW_UP)
slideshow.previous();
else if (e.keyCode == keys.ARROW_DOWN)
slideshow.next();
else
return;
} else {
// if (e.keyCode == keys.PAGE_UP || e.keyCode == keys.p || e.keyCode == keys.h)
// slideshow.previous();
// else if (e.keyCode == keys.PAGE_DOWN || e.keyCode == keys.n || e.keyCode == keys.l)
// slideshow.next();
// else
return;
}
e.preventDefault();
}
function start() {
slideshow.navigate(0);
}
function toggleHighlight(idx) {
if (highlighted(idx))
unhighlight();
else
navigate(idx, true);
}
function handleClick(evt) {
if (evt.ctrlKey || evt.metaKey) {
var sentence = evt.currentTarget;
// Ensure that the goal is shown on the side, not inline
var checkbox = sentence.getElementsByClassName("coq-toggle")[0];
if (checkbox)
checkbox.checked = false;
toggleHighlight(sentence.alectryon_index);
evt.preventDefault();
}
}
function init() {
document.onkeydown = onkeydown;
slideshow.pos = -1;
slideshow.sentences = Array.from(document.getElementsByClassName("coq-sentence"));
slideshow.sentences.forEach(function (s, idx) {
s.addEventListener('click', handleClick, false);
s.alectryon_index = idx;
});
}
slideshow.start = start;
slideshow.end = unhighlight;
slideshow.navigate = navigate;
slideshow.next = function() { navigate(slideshow.pos + 1); };
slideshow.previous = function() { navigate(slideshow.pos + -1); };
window.addEventListener('DOMContentLoaded', init);
})(Alectryon.slideshow || (Alectryon.slideshow = {}));
(function (styles) {
var styleNames = ["centered", "floating", "windowed"];
function className(style) {
return "alectryon-" + style;
}
function setStyle(style) {
var root = document.getElementsByClassName("alectryon-root")[0];
styleNames.forEach(function (s) {
root.classList.remove(className(s)); });
root.classList.add(className(style));
}
function init() {
var header = document.getElementsByClassName("alectryon-header")[0];
if (header) {
header.append(" Style: ");
styleNames.forEach(function (styleName, idx) {
var s = styleName;
var a = document.createElement("a");
a.onclick = function() { setStyle(s); };
a.append(styleName);
if (idx > 0) header.append("; ");
header.appendChild(a);
});
header.append(".");
}
}
window.addEventListener('DOMContentLoaded', init);
styles.setStyle = setStyle;
})(Alectryon.styles || (Alectryon.styles = {}));
})(Alectryon || (Alectryon = {}));
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