bmstu-mt-wp/scripts/script.js

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JavaScript
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var domSlides = document.querySelectorAll('section.slide'),
url = document.location,
slides = [],
backhash = {},
linkScreen = document.querySelector('link[title=screen]'),
linkProjection = document.querySelector('link[title=projection]');
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for(var i = 0, len = domSlides.length; i < len; i++) {
var id = domSlides[i].id;
slides[i] = '#' + id;
backhash['#' + id] = i;
}
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function fullScreen() {
return window.screenX == 0 &&
window.screenY == 0 &&
screen.width == window.outerWidth &&
screen.height == window.outerHeight;
}
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function turnSlide(e) {
if(!fullScreen()) return;
var current = backhash[url.hash],
target,
command;
switch(e.which) {
case 33 : // PgUp
case 38 : // Up
case 37 : // Left
current--;
break;
case 34 : // PgDown
case 40 : // Down
case 39 : // Right
current++;
break;
case 32 : // Space
current += e.shiftKey ? -1 : 1;
break;
default:
return;
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}
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target = slides[current];
e.preventDefault();
if(target) url.hash = target;
}
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function updateView() {
var fullscreen = fullScreen();
linkScreen.disabled = fullscreen;
linkProjection.disabled = !fullscreen;
if(fullscreen && !backhash[url.hash]) url.hash = slides[0];
}
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window.addEventListener('DOMContentLoaded', updateView, false);
window.addEventListener('resize', updateView, false);
document.addEventListener('keyup', turnSlide, false);