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refactor(chips): update to abstract the selection logic using controller
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,141 @@ | ||
| import { type ReactiveController, type ReactiveControllerHost } from "lit"; | ||
| import { KeyboardKeys } from "../internals"; | ||
| import { waitAMicrotask } from "../utils"; | ||
| import type { Chip } from "./chip"; | ||
| import { DeselectEvent, SelectEvent } from "./events"; | ||
|
|
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| type Host = ReactiveControllerHost & Chip; | ||
|
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| /* | ||
| * To use, elements should add the controller and call | ||
| * `controller.handleCheckedChange()` in a getter/setter. This must | ||
| * be synchronous to match native behavior. | ||
| */ | ||
| class ChipSelectionController implements ReactiveController { | ||
| private readonly _host: Host; | ||
|
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| constructor(host: Host) { | ||
| this._host = host; | ||
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| this.handleClick = this.handleClick.bind(this); | ||
| this.handleKeyDown = this.handleKeyDown.bind(this); | ||
| this.handleSelectedChange = this.handleSelectedChange.bind(this); | ||
| } | ||
|
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| private get _rootNode() { | ||
| const rootNode = this._host.getRootNode() as | ||
| | ShadowRoot | ||
| | Document | ||
| | HTMLElement | ||
| | null; | ||
|
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| return rootNode; | ||
| } | ||
|
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| private get _selectionProperties() { | ||
| const chipGroup = this._host.closest("tapsi-chip-group"); | ||
|
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| if (!chipGroup) return null; | ||
|
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| return { | ||
| selectMode: chipGroup.selectMode, | ||
| selectionRequired: chipGroup.selectionRequired, | ||
| }; | ||
| } | ||
|
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| private get _elements(): [Host, ...Host[]] { | ||
| if (!this._rootNode || !this._host.isConnected) return [this._host]; | ||
|
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| return Array.from( | ||
| this._rootNode.querySelectorAll<Host>("tapsi-chip"), | ||
| ) as unknown as [Host, ...Host[]]; | ||
| } | ||
|
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| private get _siblings() { | ||
| return this._elements.filter(element => element !== this._host); | ||
| } | ||
|
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| public hostConnected() { | ||
| if (this._host.selected) this._applySelectionProperties(); | ||
| } | ||
|
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| /** | ||
| * Should be called whenever the host's `selected` property changes | ||
| * synchronously. | ||
| */ | ||
| public handleSelectedChange() { | ||
| this._applySelectionProperties(); | ||
| } | ||
|
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| private _applySelectionProperties() { | ||
| const properties = this._selectionProperties; | ||
|
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| if (!properties) return; | ||
|
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| const siblings = this._siblings; | ||
| const selectedSiblings = siblings.filter(chip => chip.selected); | ||
| const hostSelected = this._host.selected; | ||
|
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| const { selectMode } = properties; | ||
| const isSingleSelect = selectMode === "single"; | ||
|
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| if (isSingleSelect && hostSelected && selectedSiblings.length !== 0) { | ||
| selectedSiblings.forEach(chip => { | ||
| chip.selected = false; | ||
| }); | ||
| } | ||
| } | ||
|
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| public async handleClick(event: MouseEvent) { | ||
| if (this._host.disabled) return; | ||
|
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| // allow event to propagate to user code after a microtask. | ||
| await waitAMicrotask(); | ||
|
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| if (event.defaultPrevented) return; | ||
|
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| const properties = this._selectionProperties; | ||
|
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| if (!properties) return; | ||
|
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| const selectedSiblings = this._siblings.filter(chip => chip.selected); | ||
|
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| const { selectionRequired } = properties; | ||
|
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| let targetEvent: SelectEvent | DeselectEvent; | ||
|
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| const hostSelected = this._host.selected; | ||
| const newHostSelected = !hostSelected; | ||
|
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| if ( | ||
| selectionRequired && | ||
| !newHostSelected && | ||
| selectedSiblings.length === 0 | ||
| ) { | ||
| return; | ||
| } | ||
|
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| if (hostSelected) targetEvent = new DeselectEvent(); | ||
| else targetEvent = new SelectEvent(); | ||
|
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| this._host.selected = !hostSelected; | ||
|
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| this._host.dispatchEvent(targetEvent); | ||
| } | ||
|
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| public async handleKeyDown(event: KeyboardEvent) { | ||
| if (this._host.disabled) return; | ||
|
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| // allow event to propagate to user code after a microtask. | ||
| await waitAMicrotask(); | ||
|
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| if (event.defaultPrevented) return; | ||
|
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| if (event.key !== KeyboardKeys.ENTER) return; | ||
| if (!event.currentTarget) return; | ||
|
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| (event.currentTarget as HTMLElement).click(); | ||
| } | ||
| } | ||
|
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| export default ChipSelectionController; |
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