60 lines
1.9 KiB
HTML
60 lines
1.9 KiB
HTML
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<div class="length-gauge {shouldAnimate ? 'should-animate' : ''} {overLimit ? 'over-char-limit' : ''}"
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style={computedStyle}
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aria-hidden="true"
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></div>
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<style>
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.length-gauge {
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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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.length-gauge.should-animate {
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transition: transform 0.2s linear;
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}
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.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 { mark, stop } from '../_utils/marks'
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import { store } from '../_store/store'
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import { observe } from 'svelte-extras'
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import { throttleTimer } from '../_utils/throttleTimer'
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const updateDisplayedLength = process.browser && throttleTimer(requestAnimationFrame)
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export default {
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oncreate () {
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const { 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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updateDisplayedLength(() => {
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mark('set lengthAsFractionDeferred')
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const { lengthAsFraction } = this.get()
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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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style: ''
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}),
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store: () => store,
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computed: {
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lengthAsFraction: ({ length, max }) => {
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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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const int = Math.round(Math.min(max, length) / max * 100)
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return (int - (int % 2)) / 100
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},
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computedStyle: ({ style, lengthAsFractionDeferred }) => `transform: scaleX(${lengthAsFractionDeferred}); ${style}`
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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>
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