58 lines
1.9 KiB
HTML
58 lines
1.9 KiB
HTML
<div class="compose-box-length-gauge {{shouldAnimate ? 'should-animate' : ''}} {{overLimit ? 'over-char-limit' : ''}}"
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style="transform: scaleX({{lengthAsFractionDeferred}});"
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aria-hidden="true"
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></div>
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<style>
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.compose-box-length-gauge {
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grid-area: gauge;
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margin: 0 0 5px 5px;
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height: 2px;
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background: var(--main-theme-color);
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transform-origin: left;
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}
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.compose-box-length-gauge.should-animate {
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transition: transform 0.2s linear;
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}
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.compose-box-length-gauge.over-char-limit {
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background: var(--warning-color);
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}
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</style>
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<script>
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import { CHAR_LIMIT } from '../../_static/statuses'
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import { mark, stop } from '../../_utils/marks'
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import { store } from '../../_store/store'
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import { scheduleIdleTask } from '../../_utils/scheduleIdleTask'
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import { observe } from 'svelte-extras'
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export default {
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oncreate () {
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let { lengthAsFraction } = this.get()
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this.set({lengthAsFractionDeferred: lengthAsFraction})
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// perf improvement for keyboard input latency
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this.observe('lengthAsFraction', () => {
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scheduleIdleTask(() => {
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mark('set lengthAsFractionDeferred')
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let { lengthAsFraction } = this.get() || {} // https://github.com/sveltejs/svelte/issues/1354
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this.set({lengthAsFractionDeferred: lengthAsFraction})
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stop('set lengthAsFractionDeferred')
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requestAnimationFrame(() => this.set({shouldAnimate: true}))
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})
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}, {init: false})
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},
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data: () => ({
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shouldAnimate: false,
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lengthAsFractionDeferred: 0
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}),
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store: () => store,
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computed: {
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lengthAsFraction: (length) => {
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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(Math.min(CHAR_LIMIT, length) / CHAR_LIMIT * 100)
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return (int - (int % 2)) / 100
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}
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},
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methods: {
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observe
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}
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}
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</script> |