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[feature/frontend] Respect prefers-reduced-motion for avatars, headers, and emojis (#3118)

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* [feature/frontend] Respect `prefers-reduced-motion` for avatars, headers, and emojis

* go fmt

* fix tests

* use static version of instance thumbnail when appropriate

* use prefers-reduced-motion

* simplify account conversion a bit

* fix c&p error
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tobi 2024-07-21 14:22:08 +02:00 • committed by GitHub
commit 027a93facc
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24 changed files with 435 additions and 140 deletions
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80
internal/text/emojify.go
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@ -32,20 +32,44 @@ func EmojifyWeb(emojis []apimodel.Emoji, html template.HTML) template.HTML {
out := emojify(
emojis,
string(html),
func(url, code string, buf *bytes.Buffer) {
buf.WriteString(`<img src="`)
buf.WriteString(url)
buf.WriteString(`" title=":`)
buf.WriteString(code)
buf.WriteString(`:" alt=":`)
buf.WriteString(code)
buf.WriteString(`:" class="emoji" `)
// Lazy load emojis when
// they scroll into view.
buf.WriteString(`loading="lazy" `)
// Limit size to avoid showing
// huge emojis when unstyled.
buf.WriteString(`width="25" height="25"/>`)
func(url, staticURL, code string, buf *bytes.Buffer) {
// Open a picture tag so we
// can present multiple options.
buf.WriteString(`<picture>`)
// Static version.
buf.WriteString(`<source `)
{
buf.WriteString(`class="emoji" `)
buf.WriteString(`srcset="` + staticURL + `" `)
buf.WriteString(`type="image/png" `)
// Show this version when user
// doesn't want an animated emoji.
buf.WriteString(`media="(prefers-reduced-motion: reduce)" `)
// Limit size to avoid showing
// huge emojis when unstyled.
buf.WriteString(`width="25" height="25" `)
}
buf.WriteString(`/>`)
// Original image source.
buf.WriteString(`<img `)
{
buf.WriteString(`class="emoji" `)
buf.WriteString(`src="` + url + `" `)
buf.WriteString(`title=":` + code + `:" `)
buf.WriteString(`alt=":` + code + `:" `)
// Lazy load emojis when
// they scroll into view.
buf.WriteString(`loading="lazy" `)
// Limit size to avoid showing
// huge emojis when unstyled.
buf.WriteString(`width="25" height="25" `)
}
buf.WriteString(`/>`)
// Close the picture tag.
buf.WriteString(`</picture>`)
},
)
@ -60,17 +84,18 @@ func EmojifyRSS(emojis []apimodel.Emoji, text string) string {
return emojify(
emojis,
text,
func(url, code string, buf *bytes.Buffer) {
buf.WriteString(`<img src="`)
buf.WriteString(url)
buf.WriteString(`" title=":`)
buf.WriteString(code)
buf.WriteString(`:" alt=":`)
buf.WriteString(code)
buf.WriteString(`:" `)
// Limit size to avoid showing
// huge emojis in RSS readers.
buf.WriteString(`width="25" height="25"/>`)
func(url, staticURL, code string, buf *bytes.Buffer) {
// Original image source.
buf.WriteString(`<img `)
{
buf.WriteString(`src="` + url + `" `)
buf.WriteString(`title=":` + code + `:" `)
buf.WriteString(`alt=":` + code + `:" `)
// Limit size to avoid showing
// huge emojis in RSS readers.
buf.WriteString(`width="25" height="25" `)
}
buf.WriteString(`/>`)
},
)
}
@ -85,7 +110,7 @@ func Demojify(text string) string {
func emojify(
emojis []apimodel.Emoji,
input string,
write func(url, code string, buf *bytes.Buffer),
write func(url, staticURL, code string, buf *bytes.Buffer),
) string {
// Build map of shortcodes. Normalize each
// shortcode by readding closing colons.
@ -107,10 +132,11 @@ func emojify(
// Escape raw emoji content.
url := html.EscapeString(emoji.URL)
staticURL := html.EscapeString(emoji.StaticURL)
code := html.EscapeString(emoji.Shortcode)
// Write emoji repr to buffer.
write(url, code, buf)
write(url, staticURL, code, buf)
return buf.String()
},
)