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Upscale thumbnails to the container size

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Force thumbnails to be the size of the container, even if that means
upscaling them. As per comment, this will mean that the thumbnails
will sometimes be larger and a bit blurry rather than small. It looks
like this was probably a source of scroll jumps before.

As per comment, a better fix would be to be be able to know what
size thumbnails the HS will give us so we can size the containers
appropriately.

Type: defect
Regressed by: https://github.com/matrix-org/matrix-react-sdk/pull/6514
Fixes https://github.com/vector-im/element-web/issues/18307
This commit is contained in:
David Baker 2021-08-10 15:14:04 +01:00
parent 87690f0739
commit 50aa3d6c46
1 changed files with 15 additions and 3 deletions
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18
src/components/views/messages/MImageBody.tsx
View File

@ -347,12 +347,21 @@ export default class MImageBody extends React.Component<IBodyProps, IState> {
className="mx_MImageBody_thumbnail"
src={thumbUrl}
ref={this.image}
style={{ maxWidth: `min(100%, ${maxWidth}px)` }}
// Force the image to be the full size of the container, even if the
// pixel size is smaller. The problem here is that we don't know what
// thumbnail size the HS is going to give us, but we have to commit to
// a container size immediately and not change it when the image loads
// or we'll get a scroll jump (or have to leave blank space).
// This will obviously result in an upscaled image which will be a bit
// blurry. The best fix would be for the HS to advertise what size thumbnails
// it guarantees to produce.
style={{ height: '100%' }}
alt={content.body}
onError={this.onImageError}
onLoad={this.onImageLoad}
onMouseEnter={this.onImageEnter}
onMouseLeave={this.onImageLeave} />
onMouseLeave={this.onImageLeave}
/>
);
}
@ -379,7 +388,10 @@ export default class MImageBody extends React.Component<IBodyProps, IState> {
</div>
}
<div style={{ display: !showPlaceholder ? undefined : 'none' }}>
<div style={{
display: !showPlaceholder ? undefined : 'none',
height: '100%', // Also force to size of a parent to prevent scroll-jumps (see above)
}}>
{ img }
{ gifLabel }
</div>