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Rich text: move format boundaries to ref callback and separate file (#…
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packages/rich-text/src/component/use-format-boundaries.js
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,144 @@ | ||
| /** | ||
| * WordPress dependencies | ||
| */ | ||
| import { useRefEffect } from '@wordpress/compose'; | ||
|
|
||
| import { LEFT, RIGHT } from '@wordpress/keycodes'; | ||
|
|
||
| /** | ||
| * Internal dependencies | ||
| */ | ||
| import { isCollapsed } from '../is-collapsed'; | ||
|
|
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| const EMPTY_ACTIVE_FORMATS = []; | ||
|
|
||
| export function useFormatBoundaries( { | ||
| record, | ||
| applyRecord, | ||
| setActiveFormats, | ||
| } ) { | ||
| return useRefEffect( | ||
| ( element ) => { | ||
| function onKeyDown( event ) { | ||
| const { keyCode, shiftKey, altKey, metaKey, ctrlKey } = event; | ||
|
|
||
| if ( | ||
| // Only override left and right keys without modifiers pressed. | ||
| shiftKey || | ||
| altKey || | ||
| metaKey || | ||
| ctrlKey || | ||
| ( keyCode !== LEFT && keyCode !== RIGHT ) | ||
| ) { | ||
| return; | ||
| } | ||
|
|
||
| const { | ||
| text, | ||
| formats, | ||
| start, | ||
| end, | ||
| activeFormats: currentActiveFormats = [], | ||
| } = record.current; | ||
| const collapsed = isCollapsed( record.current ); | ||
| const { ownerDocument } = element; | ||
| const { defaultView } = ownerDocument; | ||
| // To do: ideally, we should look at visual position instead. | ||
| const { direction } = defaultView.getComputedStyle( element ); | ||
| const reverseKey = direction === 'rtl' ? RIGHT : LEFT; | ||
| const isReverse = event.keyCode === reverseKey; | ||
|
|
||
| // If the selection is collapsed and at the very start, do nothing if | ||
| // navigating backward. | ||
| // If the selection is collapsed and at the very end, do nothing if | ||
| // navigating forward. | ||
| if ( collapsed && currentActiveFormats.length === 0 ) { | ||
| if ( start === 0 && isReverse ) { | ||
| return; | ||
| } | ||
|
|
||
| if ( end === text.length && ! isReverse ) { | ||
| return; | ||
| } | ||
| } | ||
|
|
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| // If the selection is not collapsed, let the browser handle collapsing | ||
| // the selection for now. Later we could expand this logic to set | ||
| // boundary positions if needed. | ||
| if ( ! collapsed ) { | ||
| return; | ||
| } | ||
|
|
||
| const formatsBefore = | ||
| formats[ start - 1 ] || EMPTY_ACTIVE_FORMATS; | ||
| const formatsAfter = formats[ start ] || EMPTY_ACTIVE_FORMATS; | ||
|
|
||
| let newActiveFormatsLength = currentActiveFormats.length; | ||
| let source = formatsAfter; | ||
|
|
||
| if ( formatsBefore.length > formatsAfter.length ) { | ||
| source = formatsBefore; | ||
| } | ||
|
|
||
| // If the amount of formats before the caret and after the caret is | ||
| // different, the caret is at a format boundary. | ||
| if ( formatsBefore.length < formatsAfter.length ) { | ||
| if ( | ||
| ! isReverse && | ||
| currentActiveFormats.length < formatsAfter.length | ||
| ) { | ||
| newActiveFormatsLength++; | ||
| } | ||
|
|
||
| if ( | ||
| isReverse && | ||
| currentActiveFormats.length > formatsBefore.length | ||
| ) { | ||
| newActiveFormatsLength--; | ||
| } | ||
| } else if ( formatsBefore.length > formatsAfter.length ) { | ||
| if ( | ||
| ! isReverse && | ||
| currentActiveFormats.length > formatsAfter.length | ||
| ) { | ||
| newActiveFormatsLength--; | ||
| } | ||
|
|
||
| if ( | ||
| isReverse && | ||
| currentActiveFormats.length < formatsBefore.length | ||
| ) { | ||
| newActiveFormatsLength++; | ||
| } | ||
| } | ||
|
|
||
| if ( newActiveFormatsLength === currentActiveFormats.length ) { | ||
| record.current._newActiveFormats = isReverse | ||
| ? formatsBefore | ||
| : formatsAfter; | ||
| return; | ||
| } | ||
|
|
||
| event.preventDefault(); | ||
|
|
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| const newActiveFormats = source.slice( | ||
| 0, | ||
| newActiveFormatsLength | ||
| ); | ||
| const newValue = { | ||
| ...record.current, | ||
| activeFormats: newActiveFormats, | ||
| }; | ||
| record.current = newValue; | ||
| applyRecord( newValue ); | ||
| setActiveFormats( newActiveFormats ); | ||
| } | ||
|
|
||
| element.addEventListener( 'keydown', onKeyDown ); | ||
| return () => { | ||
| element.removeEventListener( 'keydown', onKeyDown ); | ||
| }; | ||
| }, | ||
| [ record, applyRecord, setActiveFormats ] | ||
| ); | ||
| } |