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/* Print button */
presentationStyle.cssRules[presentationStyle.cssRules.length - 1]
.insertRule("article, body { border: none !important; margin: 0; max-width: none; padding: 0; }");
presentationStyle.cssRules[presentationStyle.cssRules.length - 1]
.insertRule("nav, #article-container > :not(.slide), #pagenav { display: none !important; }");
presentationStyle.cssRules[presentationStyle.cssRules.length - 1]
.insertRule(".slide { height: 210mm; width: 297mm; margin: 0; }");
const printBtn = document.getElementById('printBtn');
printBtn.addEventListener('click', function() {
window.print();
});
/* Next and previous buttons */
const prevSlideBtn = document.getElementById('prevSlideBtn');
const slideIndexShow = document.getElementById('slideIndex');
const nextSlideBtn = document.getElementById('nextSlideBtn');
const slides = document.getElementsByClassName('slide');
var presenting = false;
var slideIndex = parseInt(document.URL.substr(document.URL.indexOf("#slide") + 7));
if (isNaN(slideIndex)) slideIndex = 0;
slideIndexShow.innerText = slideIndex;
slideIndexShow.href = '#slide-' + slideIndex;
var liIncrement = [];
var liCurrent = 0;
function resetIncrementation() {
liCurrent = 0;
liIncrement.forEach((li, i) => li.classList.remove('invisible-present'));
liIncrement = [];
}
// Shows the "slideIndex + mod" numbered slide
function showSlide(mod) {
if (!presenting) return;
if (incrementationMode) {
if (mod > 0 && liIncrement.length > 0 && liCurrent < liIncrement.length) {
liIncrement[liCurrent++].classList.remove('invisible-present');
return;
}
else if (mod < 0) {
resetIncrementation();
}
}
slides[slideIndex].classList.remove('absolute-slide');
slideIndex = (slides.length + slideIndex + mod) % slides.length;
slides[slideIndex].classList.add('absolute-slide');
if (incrementationMode && mod > 0) {
liCurrent = 0;
liIncrement = slides[slideIndex].querySelectorAll('li, dt, dd');
liIncrement.forEach((li, i) => li.classList.add('invisible-present'));
}
slideIndexShow.innerText = slideIndex;
slideIndexShow.href = '#slide-' + slideIndex;
}
prevSlideBtn.addEventListener('click', function() {
showSlide(-1);
});
nextSlideBtn.addEventListener('click', function() {
showSlide(+1);
});
/* Incrementation button */
const incrementationBtn = document.getElementById('incrementationBtn');
var incrementationMode = false;
function updateIncrementationMode() {
incrementationMode = !incrementationMode;
if (incrementationMode)
incrementationBtn.innerText = '⋱';
else
incrementationBtn.innerText = '⋮';
resetIncrementation();
}
incrementationBtn.addEventListener('click', updateIncrementationMode);
/* Present button */
const presentCont = document.getElementById('presentCont');
const presentBtn = document.getElementById('presentBtn');
const articleBtn = document.getElementById('articleBtn');
var pageY = 0;
var pageX = 0;
function togglePresentMode() {
if (presentationStyle.disabled) return;
// Hide the whole page
document.body.classList.toggle('invisible');
document.body.classList.toggle('no-overflow');
// Fix background color
document.body.classList.toggle('body-bg-color');
// Show the slide controller
presentCont.classList.toggle('absolute-cont');
for (var i = presentCont.children.length - 1; i >= 0; i--) {
if (i == 5) continue; // presentBtn
presentCont.children[i].classList.toggle('nodisplay');
}
presentBtn.classList.toggle('setting-btn');
if (presentBtn.innerText[0] === 'P') {
presentBtn.innerText = presentBtn.innerText.substr(8);
} else {
presentBtn.innerText = 'Present ' + presentBtn.innerText;
}
// Show the first slide
slides[slideIndex].classList.toggle('absolute-slide');
// Alignment of presentation to screen
if (presenting) {
window.scrollTo(pageX, pageY);
}
else {
pageY = window.scrollY; pageX = window.scrollX;
window.scrollTo(0, 0);
}
presenting = !presenting;
fixAbsoluteSlideScale();
}
presentBtn.addEventListener('click', togglePresentMode);
function fixAbsoluteSlideScale() {
var height = (presenting) ? window.innerHeight : articleElem.offsetHeight;
var width = (presenting) ? window.innerWidth : articleElem.offsetWidth - 32;
var scale = Math.min(height / slides[0].offsetHeight, width / slides[0].offsetWidth);
// Update .slide
presentationStyle.cssRules[0].style.transform = 'scale(' + scale + ')';
presentationStyle.cssRules[0].style.marginBottom = 'calc(1em - ' + slides[0].offsetHeight + 'px * ' + (1 - scale) + ')';
// Update .absolute-slide
presentationStyle.cssRules[1].style.transform = 'translate(-50%, -50%) scale(' + scale + ')';
// Update .clicked-image
presentationStyle.cssRules[2].style.transform = 'translate(-50%, -50%) scale(' + (1/scale) + ')';
}
function resizeCallback() {
let article = document.getElementsByTagName('article')[0];
if (article)
new ResizeObserver(fixAbsoluteSlideScale).observe(article);
else
setTimeout(resizeCallback, 0.1);
}
resizeCallback();
/* Show as article button */
function togglePresentationController() {
printBtn.classList.toggle('nodisplay');
presentBtn.classList.toggle('nodisplay');
// Fix message
if (articleBtn.innerText[3] === 'a')
articleBtn.innerText = 'As slides ☲';
else
articleBtn.innerText = 'As article ☲';
}
function toggleArticleMode() {
// Toggle presentation.css
presentationStyle.disabled = !presentationStyle.disabled;
// Add or remove "a" to url when in or not in article mode
var href = window.location.href;
var indqa = href.indexOf('?a');
if (presentationStyle.disabled && indqa == -1) {
var indquery = href.indexOf('?');
if (indquery < 0) {
var indend = Math.max(href.lastIndexOf('/'), href.indexOf('.html') + 4);
href = href.slice(0, indend + 1) + '?a' + href.slice(indend + 1);
}
else {
href = href.slice(0, indquery + 1) + 'a' + href.slice(indquery + 1);
}
}
else if (!presentationStyle.disabled && indqa > -1) {
href = href.slice(0, indqa) + href.slice(indqa + 2);
}
window.history.replaceState(history.state, document.title, href);
togglePresentationController();
fixAbsoluteSlideScale();
}
articleBtn.addEventListener('click', toggleArticleMode);
if (presentationStyle.disabled)
togglePresentationController();
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