site-accueil-insa/assets/js/photos.js

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JavaScript
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let showcase = $("#imgBig");
let showcaseButtonContainer = $("#photoButtonsContainer");
let showcaseDownload = $("#downloadButton");
let photoOverlay = $("#photoOverlay");
let headerTop = $("#header-top");
let sideNav = $("#menuSidenav");
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let loading = $("#loadingIconContainer");
let move_photo = false;
let grab_offsetX = 0;
let grab_offsetY = 0;
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let idle_time = 0;
let isMobile = window.matchMedia("only screen and (max-width: 480px)").matches;
let isMouseOverButtons = false;
$(document).ready(
function () {
showcase.bind("mousewheel", function(event, delta) {
let min_width = $(window).width() / 5;
let min_height = $(window).height() / 5;
let max_width = $(window).width() * 5;
let max_height = $(window).height() * 5;
let scale = 150 / 100;
if (delta < 0)
scale = 1/scale;
let cursorY = event.pageY - $(window).scrollTop();
let offsetX = event.pageX - (showcase.position().left + showcase.width()/2);
let offsetY = cursorY - (showcase.position().top + showcase.height()/2);
let new_width = showcase.width() * scale;
let new_height = showcase.height() * scale;
if (new_width > max_width || new_width < min_width)
new_width = 0;
if (new_height > max_height || new_height < min_height)
new_height = 0;
if (new_width !== 0 && new_height !== 0){
let new_left = event.pageX - (offsetX * scale);
let new_top = cursorY - (offsetY * scale);
showcase.width(new_width);
showcase.height(new_height);
if (new_height > $(window).height() || new_width > $(window).width()){
showcase.css('left', new_left +'px');
showcase.css('top', new_top +'px');
showcase.css('cursor', 'move');
}
else{
showcase.css('left', $(window).width()/2 +'px');
showcase.css('top', $(window).height()/2 +'px');
showcase.css('cursor', 'default');
}
}
return false;
});
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document.getElementById("photosTitle").scrollIntoView();
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showcase.on('dragstart', function(event) { event.preventDefault(); }); // Stop image drag out of page
if (!isMobile)
setInterval(timerIncrement, 100);
}
);
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$(document).mousemove(function (event) {
let cursorY = event.pageY - $(window).scrollTop();
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let elem = document.elementFromPoint(event.pageX, cursorY);
isMouseOverButtons = !(elem.id === "closeBack" || elem.id === "loadingIconContainer" || elem.id === showcase.attr('id')); // Prevent entering fullscreen when cursor on control buttons
idle_time = 0;
});
showcase.mousemove(function(event){
if (showcase.height() > $(window).height() || showcase.width() > $(window).width) {
showcase.css('cursor', 'move');
if (move_photo){
let cursorY = event.pageY - $(window).scrollTop();
let offsetX = event.pageX - (showcase.position().left + showcase.width()/2);
let offsetY = cursorY - (showcase.position().top + showcase.height()/2);
let new_left = showcase.position().left + showcase.width()/2 + offsetX - grab_offsetX;
let new_top = showcase.position().top + showcase.height()/2 + offsetY - grab_offsetY;
showcase.css('left', new_left +'px');
showcase.css('top', new_top +'px');
}
}
else{
showcase.css('cursor', 'default');
}
});
showcase.mousedown(function(event){
move_photo = true;
let cursorY = event.pageY - $(window).scrollTop();
grab_offsetX = event.pageX - (showcase.position().left + showcase.width()/2);
grab_offsetY = cursorY - (showcase.position().top + showcase.height()/2);
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if (isMobile)
toggleFullscreen();
});
showcase.mouseup(function(){
move_photo = false;
});
showcase.mouseleave(function(){
move_photo = false;
});
/*
* Display selected image in showcase
* When clicked, display image in full size
*/
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function displayBig(elem) {
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isMouseOverButtons = false; // Allow fullscreen when clicking on an image without mouving the mouse
changeImage($(elem).attr('src'));
hideTopBar();
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disableFullscreen();
photoOverlay.fadeIn(500);
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$('body').css('overflow', 'hidden');
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}
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function getSourceFromThumbnail(source) {
return source.replace("photos_thumb/", "photos/");
}
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function getThumbnailFromSource(source) {
return source.replace("photos/", "photos_thumb/");
}
/*
* Hide showcase image
*/
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function closeBig() {
showTopBar();
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disableFullscreen();
photoOverlay.fadeOut(500);
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$('body').css('overflow', 'auto');
scrollToShowcaseImage();
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}
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function scrollToShowcaseImage() {
let source = showcase.attr('src');
let image = $("img[src$='" + getThumbnailFromSource(source) + "']");
if (image !== undefined) {
image.get(0).scrollIntoView();
}
}
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function enableFullscreen() {
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showcaseButtonContainer.fadeOut(500);
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}
function disableFullscreen() {
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showcaseButtonContainer.fadeIn(500);
}
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function toggleFullscreen() {
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if (isFullscreen())
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disableFullscreen();
else
enableFullscreen();
}
function hideTopBar() {
headerTop.fadeOut(500);
sideNav.fadeOut(500);
}
function showTopBar() {
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headerTop.fadeIn(500);
sideNav.fadeIn(500);
}
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function isFullscreen(){
return showcaseButtonContainer.css("display") === "none";
}
function timerIncrement() {
if (isMouseOverButtons)
idle_time = 0;
else
idle_time = idle_time+ 1;
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if (idle_time > 10 && !isFullscreen()) { // 1 second
enableFullscreen();
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} else if (idle_time <= 10 && isFullscreen()){
disableFullscreen();
}
}
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/*
* Control images with keyboard arrows
*/
$(document).keydown(function (e) {
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switch (e.keyCode) {
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case 37: // left
displayNext(-1);
break;
case 39: // right
displayNext(1);
break;
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case 27: // escape
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closeBig();
break;
default:
return; // exit this handler for other keys
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}
e.preventDefault(); // prevent the default action (scroll / move caret)
});
/*
* Display next/last image in showcase. When reaching end/start, loop back to start/end
*/
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function displayNext(direction) {
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let currentSrc = showcase.attr('src');
let photos = document.getElementsByClassName("photo");
let current = 0;
for (let i = 0; i < photos.length; i++) {
if (getSourceFromThumbnail($(photos[i]).attr('src')) === currentSrc) {
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current = i;
}
}
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let next = current + direction;
let nextId = "";
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if (direction > 0) {
nextId = "#photo-0";
} else {
nextId = "#photo-" + (photos.length - 1);
}
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if (document.getElementById("photo-" + next) != null) {
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nextId = "#photo-" + next;
}
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let nextSrc = $(nextId).attr('src');
changeImage(nextSrc);
}
/*
* Change image source, link and download
*/
function changeImage(thumb) {
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displayLoading();
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showcase.css('display', 'none');
showcase.on('load', function () {
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hideLoading();
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showcase.css('display', 'block');
if ($(showcase).width() > $(window).width()){ // prevent display problems on portait devices
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let scale = $(window).width() * 0.9 / $(showcase).width();
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$(showcase).width(scale*$(showcase).width());
$(showcase).height(scale*$(showcase).height());
}
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});
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let source = getSourceFromThumbnail(thumb);
showcase.attr("src", source);
showcase.css({
width: 'auto',
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height: '90%',
});
showcase.css('left', $(window).width()/2 +'px');
showcase.css('top', $(window).height()/2 +'px');
showcaseDownload.attr("href", source);
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}
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function displayLoading() {
loading.show();
}
function hideLoading() {
loading.fadeOut(200);
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}