forked from rebillar/site-accueil-insa
286 lines
8.1 KiB
JavaScript
Executable file
286 lines
8.1 KiB
JavaScript
Executable file
let showcase = $("#img-big");
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let showcaseButton = $("#photo-buttons");
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let showcaseLink = $("#img_big_link");
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let showcaseDownload = $("#img_big_download");
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let photoOverlay = $("#photo-overlay");
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let headerTop = $("#header-top");
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let sideNav = $("#menuSidenav");
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let loading = $("#loading");
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var move_photo = false;
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var grab_offsetX = 0;
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var grab_offsetY = 0;
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var idle_time = 0;
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var scaling = false;
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var isMobile = window.matchMedia("only screen and (max-width: 480px)").matches;
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var isMouseOverButtons = false;
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$(document).ready(
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function () {
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showcase.bind("mousewheel", function(event, delta) {
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let min_width = $(window).width() / 5;
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let min_height = $(window).height() / 5;
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let max_width = $(window).width() * 5;
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let max_height = $(window).height() * 5;
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let scale = 150 / 100;
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if (delta < 0)
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scale = 1/scale;
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let cursorY = event.pageY - $(window).scrollTop();
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let offsetX = event.pageX - (showcase.position().left + showcase.width()/2);
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let offsetY = cursorY - (showcase.position().top + showcase.height()/2);
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let new_width = showcase.width() * scale;
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let new_height = showcase.height() * scale;
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if (new_width > max_width || new_width < min_width)
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new_width = 0;
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if (new_height > max_height || new_height < min_height)
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new_height = 0;
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if (new_width !== 0 && new_height !== 0){
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let new_left = event.pageX - (offsetX * scale);
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let new_top = cursorY - (offsetY * scale);
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showcase.width(new_width);
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showcase.height(new_height);
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if (new_height > $(window).height() || new_width > $(window).width()){
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showcase.css('left', new_left +'px');
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showcase.css('top', new_top +'px');
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showcase.css('cursor', 'move');
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}
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else{
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showcase.css('left', $(window).width()/2 +'px');
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showcase.css('top', $(window).height()/2 +'px');
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showcase.css('cursor', 'default');
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}
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}
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return false;
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});
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document.getElementById("photos_title").scrollIntoView();
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showcase.on('dragstart', function(event) { event.preventDefault(); }); // Stop image drag out of page
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if (!isMobile)
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setInterval(timerIncrement, 100);
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}
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);
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$(document).mousemove(function (event) {
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let cursorY = event.pageY - $(window).scrollTop();
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var elem = document.elementFromPoint(event.pageX, cursorY);
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isMouseOverButtons = !(elem.id === "close-back" || elem.id === "img-big"); // Prevent entering fullscreen when cursor on control buttons
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idle_time = 0;
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});
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showcase.mousemove(function(event){
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if (showcase.height() > $(window).height() || showcase.width() > $(window).width) {
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showcase.css('cursor', 'move');
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if (move_photo){
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let cursorY = event.pageY - $(window).scrollTop();
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let offsetX = event.pageX - (showcase.position().left + showcase.width()/2);
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let offsetY = cursorY - (showcase.position().top + showcase.height()/2);
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let new_left = showcase.position().left + showcase.width()/2 + offsetX - grab_offsetX;
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let new_top = showcase.position().top + showcase.height()/2 + offsetY - grab_offsetY;
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showcase.css('left', new_left +'px');
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showcase.css('top', new_top +'px');
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}
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}
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else{
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showcase.css('cursor', 'default');
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}
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});
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showcase.mousedown(function(event){
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move_photo = true;
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let cursorY = event.pageY - $(window).scrollTop();
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grab_offsetX = event.pageX - (showcase.position().left + showcase.width()/2);
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grab_offsetY = cursorY - (showcase.position().top + showcase.height()/2);
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if (isMobile)
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toggleFullscreen();
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});
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showcase.mouseup(function(){
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move_photo = false;
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});
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showcase.mouseleave(function(){
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move_photo = false;
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});
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/*
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* Display selected image in showcase
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* When clicked, display image in full size
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*/
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function displayBig(elem) {
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changeImage($(elem).attr('src'));
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hideTopBar();
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disableFullscreen();
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photoOverlay.fadeIn(500);
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}
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function getSourceFromThumbnail(source) {
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return source.replace("photos_thumb/", "photos/");
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}
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/*
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* Hide showcase image
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*/
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function closeBig() {
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showTopBar();
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disableFullscreen();
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photoOverlay.fadeOut(500);
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}
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function enableFullscreen() {
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showcaseButton.fadeOut(500);
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}
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function disableFullscreen() {
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showcaseButton.fadeIn(500);
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}
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function toggleFullscreen() {
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if (is_fullscreen())
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disableFullscreen();
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else
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enableFullscreen();
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}
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function hideTopBar() {
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headerTop.fadeOut(500);
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sideNav.fadeOut(500);
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}
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function showTopBar() {
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headerTop.fadeIn(500);
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sideNav.fadeIn(500);
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}
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function is_fullscreen(){
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return showcaseButton.css("display") === "none";
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}
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function timerIncrement() {
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if (isMouseOverButtons)
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idle_time = 0;
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else
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idle_time = idle_time+ 1;
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if (idle_time > 10 && !is_fullscreen()) { // 1 second
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enableFullscreen();
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} else if (idle_time <= 10 && is_fullscreen()){
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disableFullscreen();
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}
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}
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/*
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* Control images with keyboard arrows
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*/
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$(document).keydown(function (e) {
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switch (e.keyCode) {
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case 37: // left
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displayNext(-1);
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break;
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case 39: // right
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displayNext(1);
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break;
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case 27:
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closeBig();
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break;
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default:
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return; // exit this handler for other keys
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}
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e.preventDefault(); // prevent the default action (scroll / move caret)
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});
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/*
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* Control images with swipes
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*/
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var img = document.querySelector('#img-big');
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// Create a manager to manager the element
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var manager = new Hammer.Manager(img, {touchAction: "auto"}); // enable the touch action to allow scrolling on the sidenav
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// Create a recognizer
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var Swipe = new Hammer.Swipe();
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// Add the recognizer to the manager
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manager.add(Swipe);
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// Subscribe to the swipe event
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manager.on('swipe', function(e) {
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var direction = e.offsetDirection;
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if (isMobile){
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if (direction === 4) { // right
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displayNext(-1);
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} else if (direction === 2) { // left
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displayNext(1);
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}
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}
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});
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/*
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* Display next/last image in showcase. When reaching end/start, loop back to start/end
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*/
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function displayNext(direction) {
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var currentSrc = showcase.attr('src');
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var photos = document.getElementsByClassName("photo");
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var current = 0;
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for (var i = 0; i < photos.length; i++) {
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if (getSourceFromThumbnail($(photos[i]).attr('src')) === currentSrc) {
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current = i;
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}
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}
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var next = current + direction;
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var nextId = "";
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if (direction > 0) {
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nextId = "#photo-0";
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} else {
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nextId = "#photo-" + (photos.length - 1);
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}
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if (document.getElementById("photo-" + next) != null) {
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nextId = "#photo-" + next;
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}
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var nextSrc = $(nextId).attr('src');
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changeImage(nextSrc);
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}
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/*
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* Change image source, link and download
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*/
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function changeImage(thumb) {
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displayLoading();
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showcase.css('display', 'none');
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showcase.on('load', function () {
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hideLoading();
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showcase.css('display', 'block');
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if ($(showcase).width() > $(window).width()){ // prevent display problems on portait devices
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var scale = $(window).width() * 0.9 / $(showcase).width();
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$(showcase).width(scale*$(showcase).width());
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$(showcase).height(scale*$(showcase).height());
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}
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});
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var source = getSourceFromThumbnail(thumb);
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showcase.attr("src", source);
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showcase.css({
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width: 'auto',
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height: '90%',
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});
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showcase.css('left', $(window).width()/2 +'px');
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showcase.css('top', $(window).height()/2 +'px');
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showcaseLink.attr("href", source);
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showcaseDownload.attr("href", source);
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}
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function displayLoading() {
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loading.show();
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}
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function hideLoading() {
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loading.fadeOut(200);
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}
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