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+// Deuxfleurs website script
+// Author: Deuxfleurs association
+// License: CC-BY-SA
+// Version: 2.0
+// Date: 2024
+
+// Dictionary containing the animated frames' ID as key, and animation delay as value
+const animationDelay = {
+ 'illustration-accueil': 500,
+ 'rennes': 1000,
+ 'orsay': 2000,
+ 'parterre': 1500
+};
+
+// Dictionary to keep track of frame count for each animation
+let animationFrame = {};
+// Dictionary to keep track of the animation callbacks in order to stop them
+let animationCallback = {};
+
+// Animations toggle switch (will be initialised in setupPage)
+let isAnimated = false;
+
+
+// Load the script once the document is ready
+document.addEventListener('DOMContentLoaded', function() {
+ setupPage();
+});
+
+function setupPage() {
+ // Check if the user configured that they prefer reduced motion
+ const prefersReducedMotion = window.matchMedia("(prefers-reduced-motion)").matches;
+ // Set the animation toggle switch value to the user's configured prefers-reduced-motion
+ isAnimated = prefersReducedMotion;
+
+ // Play/pause button setup, such that it starts/stops the animations ...
+ document.getElementById("bouton-play-pause").addEventListener("click", pauseButtonClickedCallback);
+ // ... and has a content reflecting the animation state
+ setPauseButtonContent();
+
+ // Initialise the animations by looping through animationDelay keys
+ Object.keys(animationDelay).forEach((id) => initAnimation(id));
+}
+
+function initAnimation(id) {
+ // Initialise this ID's animationCallback value to null
+ animationCallback[id] = null;
+ // Start by displaying the 0th frame
+ animationFrame[id] = 0;
+
+ // Start the animation if authorised
+ if (isAnimated) {
+ startAnimation(id);
+ }
+}
+
+function startAnimation(id) {
+ // console.log(`Starting animation of frame '${id}' with delay of ${animationDelay[id]}ms.`);
+ const container = document.getElementById(id);
+
+ // Periodically calls updateAnimation with a certain `delay` and function parameters
+ // We store the callback identifier in animationCallback to be able to stop it
+ animationCallback[id] = setInterval(
+ updateAnimation,
+ animationDelay[id],
+ id, container.children, container.children.length
+ );
+}
+
+function updateAnimation(id, frames, nFrames) {
+ // Hide the current frame
+ frames[animationFrame[id]].style.display = "none";
+ // Increment the frame counter for the given id
+ animationFrame[id] = (animationFrame[id] + 1) % nFrames;
+ // Show the next frame
+ frames[animationFrame[id]].style.display = "flex";
+}
+
+function pauseButtonClickedCallback() {
+ // console.log('Play/pause button clicked');
+ // Toggle the isAnimated switch
+ isAnimated = !isAnimated;
+
+ // Update the animation status for each animated block
+ Object.keys(animationDelay).forEach((id) => {
+ if (isAnimated) {
+ // If animations were just authorised, start it
+ startAnimation(id);
+ } else {
+ // Else, stop it by calling clearInterval on the existing callback
+ clearInterval(animationCallback[id]);
+ }
+ });
+
+ setPauseButtonContent();
+}
+
+function setPauseButtonContent() {
+ // Set the button content corresponding to the animation state
+ if (isAnimated) {
+ document.getElementById("bouton-play-pause").innerHTML = "[⏸]";
+ } else {
+ document.getElementById("bouton-play-pause").innerHTML = "[⏵]";
+ }
+}