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/* Add stylesheet to page */
var presStyle = document.createElement('link');
presStyle.type = 'text/css';
presStyle.rel = 'stylesheet';
presStyle.href = '/presentation.css';
document.head.appendChild(presStyle);
/* Print button */
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;
// Shows the "slideIndex + mod" numbered slide
function showSlide(mod) {
if (!presenting) return;
slides[slideIndex].classList.remove('absolute-slide');
slideIndex = (slides.length + slideIndex + mod) % slides.length;
slides[slideIndex].classList.add('absolute-slide');
slideIndexShow.innerText = slideIndex;
slideIndexShow.href = '#slide-' + slideIndex;
}
prevSlideBtn.addEventListener('click', function() {
showSlide(-1);
});
nextSlideBtn.addEventListener('click', function() {
showSlide(+1);
});
/* 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 (document.styleSheets.item(3).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 == 4) 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
document.styleSheets.item(3).cssRules[0].style.transform = 'scale(' + scale + ')';
document.styleSheets.item(3).cssRules[0].style.marginBottom = 'calc(1em - ' + slides[0].offsetHeight + 'px * ' + (1 - scale) + ')';
// Update .absolute-slide
document.styleSheets.item(3).cssRules[1].style.transform = 'translate(-50%, -50%) scale(' + scale + ')';
// Update .clicked-image
document.styleSheets.item(3).cssRules[2].style.transform = 'translate(-50%, -50%) scale(' + (1/scale) + ')';
}
window.addEventListener('resize', fixAbsoluteSlideScale);
window.addEventListener('load', fixAbsoluteSlideScale);
/* Show as article button */
function toggleArticleMode() {
printBtn.classList.toggle('nodisplay');
presentBtn.classList.toggle('nodisplay');
// Toggle presentation.css
document.styleSheets.item(3).disabled = !document.styleSheets.item(3).disabled;
// Add a=y to url when in article mode
var url = window.location.href.substring(0, window.location.href.indexOf('?'));
if (document.styleSheets.item(3).disabled) url += '?a=y';
url += window.location.href.substr(window.location.href.indexOf('#'));
window.history.replaceState(history.state, document.title, url);
// Fix message
if (articleBtn.innerText[0] === 'A') {
articleBtn.innerText = 'Slide' + articleBtn.innerText.substr(7);
} else {
articleBtn.innerText = 'Article' + articleBtn.innerText.substr(5);
}
}
articleBtn.addEventListener('click', toggleArticleMode);
window.addEventListener('load', function() {
if (window.location.href.substr(window.location.href.indexOf('?'), 4) === '?a=y')
toggleArticleMode();
});
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