pinafore/routes/_components/compose/ComposeLengthGauge.html

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<div class="compose-box-length-gauge {{shouldAnimate ? 'should-animate' : ''}} {{overLimit ? 'over-char-limit' : ''}}"
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style="transform: scaleX({{lengthAsFractionRoundedAfterRaf || 0}});"
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aria-hidden="true"
></div>
<style>
.compose-box-length-gauge {
grid-area: gauge;
margin: 0 0 5px 5px;
height: 2px;
background: var(--main-theme-color);
transform-origin: left;
}
.compose-box-length-gauge.should-animate {
transition: transform 0.2s linear;
}
.compose-box-length-gauge.over-char-limit {
background: var(--warning-color);
}
</style>
<script>
import { CHAR_LIMIT } from '../../_static/statuses'
import { mark, stop } from '../../_utils/marks'
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import { store } from '../../_store/store'
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export default {
oncreate() {
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// perf improvement for keyboard input latency
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this.observe('lengthAsFractionRounded', lengthAsFractionRounded => {
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requestAnimationFrame(() => {
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mark('set lengthAsFractionRoundedAfterRaf')
this.set({lengthAsFractionRoundedAfterRaf: lengthAsFractionRounded})
stop('set lengthAsFractionRoundedAfterRaf')
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requestAnimationFrame(() => this.set({shouldAnimate: true}))
})
})
},
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store: () => store,
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computed: {
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lengthAsFraction: (length) => Math.min(CHAR_LIMIT, length) / CHAR_LIMIT,
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lengthAsFractionRounded: (lengthAsFraction) => {
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// We don't need to update the gauge for every decimal point, so round it to the nearest 0.02
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let int = Math.round(lengthAsFraction * 100)
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int -= (int % 2)
return int / 100
}
}
}
</script>