bmstu-mt-wp/scripts/script.js

214 lines
4.9 KiB
JavaScript
Executable File

(function () {
var url = window.location,
body = document.body,
slides = document.querySelectorAll('div.slide'),
progress = document.querySelector('div.progress div'),
slideList = [],
l = slides.length,
i;
for (i = 0; i < l; i++) {
slideList.push(slides[i].id);
}
function getTransform() {
var denominator = Math.max(
body.clientWidth / window.innerWidth,
body.clientHeight / window.innerHeight
);
return 'scale(' + (1 / denominator) + ')';
}
function applyTransform(transform) {
body.style.MozTransform = transform;
body.style.WebkitTransform = transform;
body.style.OTransform = transform;
body.style.msTransform = transform;
body.style.transform = transform;
}
function enterSingleSlideMode() {
body.className = 'full';
applyTransform(getTransform());
}
function enterSlideListMode() {
body.className = 'list';
applyTransform('none');
}
function getCurrentSlideNumber() {
return slideList.indexOf(url.hash.substr(1));
}
function scrollToCurrentSlide() {
var current_slide = document.getElementById(slideList[getCurrentSlideNumber()]);
if (null != current_slide) {
window.scrollTo(0, current_slide.offsetTop);
}
}
function isSlideListMode() {
return 'full' !== url.search.substr(1);
}
function normalizeSlideNumber(slide_number) {
if (0 > slide_number) {
return slideList.length - 1;
} else if (slideList.length <= slide_number) {
return 0;
} else {
return slide_number;
}
}
function updateProgress(slide_number) {
if (!progress) return;
progress.style.width = (100 / (slideList.length - 1) * normalizeSlideNumber(slide_number)).toFixed(2) + '%';
}
function getSlideHashByNumber(slide_number) {
return '#' + slideList[normalizeSlideNumber(slide_number)];
}
function goToSlide(slide_number) {
url.hash = getSlideHashByNumber(slide_number);
if (!isSlideListMode()) {
updateProgress(slide_number);
}
}
window.addEventListener('DOMContentLoaded', function () {
if (!isSlideListMode()) {
// "?full" is present without slide hash so we should display first
// slide
if ( -1 === getCurrentSlideNumber() ) {
history.replaceState(null, null, url.pathname + '?full' + getSlideHashByNumber( 0 ) );
}
enterSingleSlideMode();
updateProgress(getCurrentSlideNumber());
}
}, false);
window.addEventListener('popstate', function (e) {
if (isSlideListMode()) {
enterSlideListMode();
scrollToCurrentSlide();
} else {
enterSingleSlideMode();
}
}, false);
window.addEventListener('resize', function (e) {
if (!isSlideListMode()) {
applyTransform(getTransform());
}
}, false);
document.addEventListener('keydown', function (e) {
if (e.altKey || e.ctrlKey || e.metaKey) return;
var current_slide_number = getCurrentSlideNumber();
switch (e.which) {
case 9: // Tab = +1; Shift + Tab = -1
if (isSlideListMode()) {
e.preventDefault();
current_slide_number += e.shiftKey ? -1 : 1;
url.hash = getSlideHashByNumber(current_slide_number);
}
break;
case 13: // Enter
if (isSlideListMode()) {
e.preventDefault();
history.pushState(null, null, url.pathname + '?full' + getSlideHashByNumber(current_slide_number));
enterSingleSlideMode();
updateProgress(current_slide_number);
}
break;
case 27: // Esc
if (!isSlideListMode()) {
e.preventDefault();
history.pushState(null, null, url.pathname + getSlideHashByNumber(current_slide_number));
enterSlideListMode();
scrollToCurrentSlide();
}
break;
case 33: // PgUp
case 38: // Up
case 37: // Left
case 72: // h
case 75: // k
e.preventDefault();
current_slide_number--;
goToSlide(current_slide_number);
break;
case 34: // PgDown
case 40: // Down
case 39: // Right
case 76: // l
case 74: // j
e.preventDefault();
current_slide_number++;
goToSlide(current_slide_number);
break;
case 36: // Home
e.preventDefault();
current_slide_number = 0;
goToSlide(current_slide_number);
break;
case 35: // End
e.preventDefault();
current_slide_number = slideList.length - 1;
goToSlide(current_slide_number);
break;
case 32: // Space = +1; Shift + Space = -1
e.preventDefault();
current_slide_number += e.shiftKey ? -1 : 1;
goToSlide(current_slide_number);
break;
default:
// Behave as usual
}
}, false);
document.addEventListener('click', function (e) {
if (
'SECTION' === e.target.nodeName &&
-1 !== e.target.parentNode.parentNode.className.indexOf('slide') &&
isSlideListMode()
) {
e.preventDefault();
// NOTE: we should update hash to get things work properly
url.hash = '#' + e.target.parentNode.parentNode.id;
history.replaceState(null, null, url.pathname + '?full#' + e.target.parentNode.parentNode.id);
enterSingleSlideMode();
updateProgress(getCurrentSlideNumber());
}
}, false);
}());