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⚡ bolt: [gpu-accelerated scroll progress bar] #35

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⚡ bolt: [gpu-accelerated scroll progress bar] #35

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10 changes: 6 additions & 4 deletions script.js
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Original file line number Diff line number Diff line change
Expand Up @@ -582,16 +582,18 @@ const ScrollProgress = {
if (this.isModalActive) return;
const scrollTop = window.scrollY;
const docHeight = this.cachedDocHeight - this.cachedWindowHeight;
const progress = docHeight > 0 ? (scrollTop / docHeight) * 100 : 0;
this.bar.style.width = `${Math.max(0, Math.min(100, progress))}%`;
const progress = docHeight > 0 ? (scrollTop / docHeight) : 0;
// ⚡ bolt: update via transform scaleX instead of width to prevent layout thrashing
this.bar.style.transform = `scaleX(${Math.max(0, Math.min(1, progress))})`;
},

updateModal() {
if (!this.isModalActive || !this.modalContent) return;
const scrollTop = this.modalContent.scrollTop;
const scrollHeight = this.modalContent.scrollHeight - this.modalContent.clientHeight;
const progress = scrollHeight > 0 ? (scrollTop / scrollHeight) * 100 : 0;
this.bar.style.width = `${Math.max(0, Math.min(100, progress))}%`;
const progress = scrollHeight > 0 ? (scrollTop / scrollHeight) : 0;
// ⚡ bolt: update via transform scaleX instead of width to prevent layout thrashing
this.bar.style.transform = `scaleX(${Math.max(0, Math.min(1, progress))})`;
}
};

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6 changes: 4 additions & 2 deletions styles.css
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Expand Up @@ -594,9 +594,11 @@ button {
left: 0;
height: 2px;
background: var(--accent);
width: 0%;
width: 100%;
transform: scaleX(0);
transform-origin: left;
z-index: 10001;
transition: width 0.1s linear;
transition: transform 0.1s linear;
}

/* === Gallery === */
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