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Copyright 2025, Mark Forscher */
/* ======================================================================================= */
import { Utils } from './utils.js';
export class Core {
constructor() {
this.preloaderProgress = 0;
this.preloaderTargets = [];
this.targetCompletionPercentage = 65;
this.preloaderStartTime = null;
this.minDisplayTime = 0;
this.animationInterval = null;
this.contentReady = false;
this.displayedProgress = 0;
}
// Detect WebP browser support and add class to html element
detectWebPSupport() {
// Quick synchronous check using canvas
const canvas = document.createElement('canvas');
if (canvas.getContext && canvas.getContext('2d')) {
canvas.width = canvas.height = 1;
const supportsWebP = canvas.toDataURL('image/webp').indexOf('image/webp') === 0;
if (!supportsWebP) {
document.documentElement.classList.add('no-webp');
console.warn('WebP not supported - using fallback images');
} else E{
document.documentElement.classList.add('webp');
}
} else {
// Fallback for browsers without canvas support
document.documentElement.classList.add('no-webp');
}
}
// Bind global event listeners
bindEvents() {
// DOM content loaded
if (document.readyState === 'loading') {
document.addEventListener('DOMContentLoaded', () => this.onDOMReady());
} else {
this.onDOMReady();
}
// Window load event
window.addEventListener('load', () => this.onWindowLoad());
}
// DOM ready handler
onDOMReady() {
this.completePreloaderTarget('dom');
this.trackAboveFoldImageLoading();
}
// Window load handler
onWindowLoad() {
// Fallback: complete above-fold images if not already done
this.completePreloaderTarget('above-fold-images');
}
// Track above-the-fold image loading progress
trackAboveFoldImageLoading() {
// Focus on images that are likely above the fold or critical
const aboveFoldImages = Array.from(document.querySelectorAll('img')).filter(img => {
const rect = img.getBoundingClientRect();
const windowHeight = window.innerHeight;
// Include images that are:
// 1. Currently visible or within 200px of viewport
// 2. Have critical classes/attributes
// 3. Are in hero/header sections
return (
rect.top < windowHeight + 200 ||
img.closest('header, .hero, .masthead, .intro, .page-intro') ||
img.classList.contains('hero', 'featured', 'priority') ||
img.hasAttribute('loading') && img.getAttribute('loading') === 'eager'
);
});
Eif (aboveFoldImages.length === 0) {
this.completePreloaderTarget('above-fold-images');
return;
}
let loadedImages = 0;
const totalImages = aboveFoldImages.length;
const checkImageProgress = () => {
loadedImages++;
if (loadedImages >= totalImages) {
this.completePreloaderTarget('above-fold-images');
}
};
aboveFoldImages.forEach(img => {
if (img.complete) {
checkImageProgress();
} else {
img.addEventListener('load', checkImageProgress);
img.addEventListener('error', checkImageProgress); // Count errors as "loaded"
}
});
}
// Minimal preloader with smooth number animation
initPreloader() {
this.preloaderProgress = 0;
this.preloaderTargets = [
{ name: 'dom', weight: 25, completed: false },
{ name: 'above-fold-images', weight: 40, completed: false }
];
this.targetCompletionPercentage = 65; // Complete at 65% instead of 100%
// Initialize preloader display
this.preloaderStartTime = Date.now();
this.minDisplayTime = 0; // No artificial delay
this.animationInterval = null;
this.contentReady = false;
// Prevent body scrolling during preloader
document.body.style.overflow = 'hidden';
// Start progress tracking and animation
this.startPreloaderAnimation();
}
// Start smooth number animation
startPreloaderAnimation() {
const percentageText = Utils.$1('#preloader-percentage');
Eif (!percentageText) {
setTimeout(() => this.startPreloaderAnimation(), 100);
return;
}
this.displayedProgress = 0;
this.updatePreloaderDisplay();
// Quick increment animation - updates every 50ms
this.animationInterval = setInterval(() => {
this.updatePreloaderDisplay();
}, 50);
}
// Update the displayed percentage with smooth animation
updatePreloaderDisplay() {
const percentageText = Utils.$1('#preloader-percentage');
if (!percentageText) return;
// Calculate target progress based on completed targets
let actualProgress = 0;
this.preloaderTargets.forEach(target => {
if (target.completed) {
actualProgress += target.weight;
}
});
// Scale progress to show 0-100% but complete at our target percentage
const scaledTargetProgress = Math.min((actualProgress / this.targetCompletionPercentage) * 100, 100);
// Animate towards target with quick increments
Eif (this.displayedProgress < scaledTargetProgress) {
const increment = Math.max(1, Math.ceil((scaledTargetProgress - this.displayedProgress) / 8));
this.displayedProgress = Math.min(this.displayedProgress + increment, scaledTargetProgress);
// Add updating class for micro-animation
percentageText.classList.add('updating');
setTimeout(() => percentageText.classList.remove('updating'), 50);
}
// Update display
percentageText.textContent = `${Math.round(this.displayedProgress)}%`;
// Complete loading when we reach our target or 100%
if (actualProgress >= this.targetCompletionPercentage || this.displayedProgress >= 100) {
clearInterval(this.animationInterval);
this.completePreloaderAnimation();
}
}
// Complete preloader with slide-up animation
completePreloaderAnimation() {
const percentageText = Utils.$1('#preloader-percentage');
Eif (percentageText) {
percentageText.classList.add('slide-up');
}
setTimeout(() => {
this.hidePreloader();
}, 100); // Match slide-up animation duration
}
// Mark a preloader target as completed
completePreloaderTarget(targetName) {
const target = this.preloaderTargets.find(t => t.name === targetName);
if (target && !target.completed) {
target.completed = true;
// Animation will automatically pick up the change
}
}
// Hide preloader and start content loading sequence
hidePreloader() {
const preloader = Utils.$1('#preloader');
if (!preloader) return;
// Ensure minimum display time for smooth UX
const elapsed = Date.now() - this.preloaderStartTime;
const remainingTime = Math.max(0, this.minDisplayTime - elapsed);
setTimeout(() => {
preloader.classList.add('loading-complete');
setTimeout(() => {
preloader.style.display = 'none';
document.body.style.overflow = 'visible';
// Start content loading sequence
this.startContentLoadingSequence();
}, 200); // Match CSS transition duration
}, remainingTime);
}
// Start the content loading sequence after preloader
startContentLoadingSequence() {
// Restore body scrolling
document.body.style.overflow = 'visible';
// The existing fade-in system will handle viewport-based animations
}
// Show preloader for page transitions
showPreloaderForTransition() {
const preloader = Utils.$1('#preloader');
const percentageText = Utils.$1('#preloader-percentage');
if (preloader) {
// Reset classes and display
preloader.classList.remove('loading-complete', 'page-transition-out');
preloader.style.display = 'block';
preloader.style.opacity = '0';
document.body.style.overflow = 'hidden';
// Hide percentage for transitions
if (percentageText) {
percentageText.style.opacity = '0';
}
// Quick fade in
setTimeout(() => {
preloader.classList.add('page-transition-in');
}, 10);
}
}
// Detect hover capability
detectHoverCapability() {
window.addEventListener('mouseover', function onFirstHover() {
window.USER_CAN_HOVER = true;
window.removeEventListener('mouseover', onFirstHover);
}, { once: true });
}
// Navigate with page transition animation
navigateWithPreloader(href) {
// Show transition preloader
this.showPreloaderForTransition();
// Navigate after fade-in completes
setTimeout(() => {
window.location.href = href;
}, 200); // Match transition timing
}
}
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