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frontend: generic lazy loader for webcomponents (#8510)

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After seeing #8111 use a webcomponent, I think that they are a neat usecase for Forgejo where most of the frontend is backend-generated, with some "island of enhancements".

I am considering using a webcomponent for the CITATION management (last occurrence of [`Blob.GetBlobContent`](https://codeberg.org/forgejo/forgejo/issues/8222)), however I noticed that the developer experience wasn't ideal.

With this PR it would be very easy to declare a webcomponent, which will be loaded only if needed (I converted `model-viewer` and `pdf-object` to this technique).

Some cleanup in the neighbor webcomponents.

## Testing

1) Create a new repository or use an existing one.
2) Upload a `.pdf` or `.glb`  file (such as https://codeberg.org/forgejo/forgejo/src/branch/forgejo/tests/testdata/data/viewer/Unicode%E2%9D%A4%E2%99%BBTest.glb)
3) Open the Network inspector and view the file in the repository.
    - After a short loading spinner, the PDF or 3D model should be rendered in a viewer
    - the related JS should have been loaded (e.g. http://localhost:3000/assets/js/model-viewer.494bf0cd.js)
    - visiting another page and check that this JS file isn't loaded

Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/8510
Reviewed-by: Gusted <gusted@noreply.codeberg.org>
Reviewed-by: 0ko <0ko@noreply.codeberg.org>
Reviewed-by: Beowulf <beowulf@beocode.eu>
Co-authored-by: oliverpool <git@olivier.pfad.fr>
Co-committed-by: oliverpool <git@olivier.pfad.fr>
This commit is contained in:
oliverpool 2025-07-23 04:10:50 +02:00 • committed by Gusted
commit 83ea43cf49
14 changed files with 166 additions and 137 deletions
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6
web_src/css/modules/animations.css
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@ -3,11 +3,13 @@
100% { transform: translate(-50%, -50%) rotate(360deg); }
}
lazy-webc,
.is-loading {
pointer-events: none !important;
position: relative !important;
}
lazy-webc > *,
.is-loading > * {
opacity: 0.3;
}
@ -17,6 +19,7 @@
opacity: 0;
}
lazy-webc::after,
.is-loading::after {
content: "";
position: absolute;
@ -52,8 +55,7 @@ form.single-button-form.is-loading .button {
}
.markup pre.is-loading,
.editor-loading.is-loading,
.pdf-content.is-loading {
.editor-loading.is-loading {
height: var(--height-loading);
}