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71 lines
1.7 KiB
JavaScript
71 lines
1.7 KiB
JavaScript
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import { useEffect, useLayoutEffect, useMemo, useState } from 'react'
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import classnames from 'classnames'
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const measureContentWidth = element =>
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[...element.querySelectorAll('button')].reduce(
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(output, item) => output + item.scrollWidth,
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0
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)
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export default function useToolbarBreakpoint(element) {
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const [breakpoint, setBreakpoint] = useState(2)
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const [recalculate, setRecalculate] = useState(true)
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const [resizeObserver] = useState(
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() =>
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new ResizeObserver(() => {
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setBreakpoint(2)
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setRecalculate(true)
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})
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)
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const [mutationObserver] = useState(
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() =>
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new MutationObserver(() => {
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setBreakpoint(2)
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setRecalculate(true)
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})
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)
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useEffect(() => {
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if (element && mutationObserver && resizeObserver) {
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resizeObserver.observe(element)
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mutationObserver.observe(element, {
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childList: true,
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subtree: true,
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characterData: true,
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})
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return () => {
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mutationObserver.disconnect()
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resizeObserver.disconnect()
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}
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}
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}, [element, mutationObserver, resizeObserver])
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useLayoutEffect(() => {
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if (recalculate && element && breakpoint) {
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const contentWidth = measureContentWidth(element) + 150 // NOTE: remove this constant?
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if (contentWidth > element.clientWidth) {
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setBreakpoint(value => value - 1)
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} else {
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setRecalculate(false)
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}
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}
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}, [element, breakpoint, recalculate])
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return useMemo(
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() =>
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classnames({
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toolbar: true,
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'toolbar-pdf': true,
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'toolbar-large': breakpoint === 2,
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'toolbar-medium': breakpoint === 1,
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'toolbar-small': breakpoint === 0,
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}),
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[breakpoint]
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)
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}
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