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viewer: fix load transition — snapshot appears before navigation blank

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Show the canvas snapshot on the current page (z-index 9999) immediately
before navigating, so the browser's between-pages blank is hidden behind
the static image. Navigate without delay. Remove the body fadeIn animation
that was making the snapshot on the new page invisible during the 0.2s
fade-in, causing the visible blank-then-snapshot sequence.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
Bruno Postle 2026-04-26 08:29:32 +01:00
parent be1395649c
commit dd0fb2c365
1 changed files with 11 additions and 7 deletions
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18
forgejo/custom/public/assets/viewer.html
View file

@ -69,8 +69,6 @@
pointer-events: none;
}
#status:empty { display: none; }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
body { animation: fadeIn 0.2s ease; }
#snapshot-overlay {
position: fixed; inset: 0; top: var(--toolbar-h, 72px); z-index: 4;
background: #1c1c1e center/contain no-repeat;
@ -357,14 +355,20 @@
function loadUrl(url) {
if (rendererCanvas) {
try {
sessionStorage.setItem("viewerSnapshot", rendererCanvas.toDataURL("image/jpeg", 0.6));
} catch (_) { /* cross-origin or context-lost — skip */ }
const snap = rendererCanvas.toDataURL("image/jpeg", 0.6);
sessionStorage.setItem("viewerSnapshot", snap);
// Cover the 3D view with the snapshot NOW, before the page unloads,
// so the browser's navigation blank is hidden behind the static image.
const cover = document.createElement("div");
cover.style.cssText = "position:fixed;inset:0;z-index:9999;" +
"background:#1c1c1e center/contain no-repeat";
cover.style.backgroundImage = `url("${snap}")`;
document.body.appendChild(cover);
} catch (_) { /* context-lost or cross-origin — skip */ }
}
document.body.style.transition = "opacity 0.15s";
document.body.style.opacity = "0";
const pageUrl = new URL(window.location.href);
pageUrl.searchParams.set("url", url);
setTimeout(() => { window.location.href = pageUrl.toString(); }, 150);
window.location.href = pageUrl.toString();
}
urlInput.addEventListener("keydown", e => {