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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,127 @@ | ||
| const CLOSED_TAB_CLASS = "sidebar-tabpanel-hidden"; | ||
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| /* @see https://www.w3.org/WAI/ARIA/apg/patterns/tabs/examples/tabs-automatic/ */ | ||
| export class TabsAutomatic { | ||
| private tablistNode: HTMLElement; | ||
| private tabpanels: HTMLElement[]; | ||
| private tabs: HTMLElement[]; | ||
| private firstTab: null | HTMLElement; | ||
| private lastTab: null | HTMLElement; | ||
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| constructor(groupNode: HTMLElement) { | ||
| this.tablistNode = groupNode; | ||
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| this.tabs = []; | ||
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| this.firstTab = null; | ||
| this.lastTab = null; | ||
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| this.tabs = Array.from(this.tablistNode.querySelectorAll("[role=tab]")); | ||
| this.tabpanels = []; | ||
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| for (let i = 0; i < this.tabs.length; i += 1) { | ||
| const tab = this.tabs[i]; | ||
| const tabpanel = document.getElementById(tab.getAttribute("aria-controls") ?? ""); | ||
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| if (!tabpanel) { | ||
| continue; | ||
| } | ||
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| tab.tabIndex = -1; | ||
| tab.setAttribute("aria-selected", "false"); | ||
| this.tabpanels.push(tabpanel); | ||
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| tab.addEventListener("keydown", this.onKeydown.bind(this)); | ||
| tab.addEventListener("click", this.onClick.bind(this)); | ||
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| if (!this.firstTab) { | ||
| this.firstTab = tab; | ||
| } | ||
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| this.lastTab = tab; | ||
| } | ||
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| this.setSelectedTab(this.firstTab, false); | ||
| } | ||
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| setSelectedTab(currentTab: HTMLElement | null, setFocus: boolean = true) { | ||
| for (let i = 0; i < this.tabs.length; i += 1) { | ||
| var tab = this.tabs[i]; | ||
| if (currentTab === tab) { | ||
| tab.setAttribute("aria-selected", "true"); | ||
| tab.removeAttribute("tabindex"); | ||
| this.tabpanels[i].classList.remove(CLOSED_TAB_CLASS); | ||
| if (setFocus) { | ||
| tab.focus(); | ||
| } | ||
| } else { | ||
| tab.setAttribute("aria-selected", "false"); | ||
| tab.tabIndex = -1; | ||
| this.tabpanels[i].classList.add(CLOSED_TAB_CLASS); | ||
| } | ||
| } | ||
| } | ||
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| setSelectedToPreviousTab(currentTab: HTMLElement) { | ||
| if (currentTab === this.firstTab) { | ||
| this.setSelectedTab(this.lastTab); | ||
| } else { | ||
| const index = this.tabs.indexOf(currentTab); | ||
| this.setSelectedTab(this.tabs[index - 1]); | ||
| } | ||
| } | ||
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| setSelectedToNextTab(currentTab: HTMLElement) { | ||
| var index; | ||
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| if (currentTab === this.lastTab) { | ||
| this.setSelectedTab(this.firstTab); | ||
| } else { | ||
| index = this.tabs.indexOf(currentTab); | ||
| this.setSelectedTab(this.tabs[index + 1]); | ||
| } | ||
| } | ||
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| onKeydown(event: KeyboardEvent) { | ||
| let tgt = event.currentTarget; | ||
| let flag = false; | ||
|
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| if (tgt instanceof HTMLElement) { | ||
| switch (event.key) { | ||
| case "ArrowLeft": | ||
| this.setSelectedToPreviousTab(tgt); | ||
| flag = true; | ||
| break; | ||
|
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| case "ArrowRight": | ||
| this.setSelectedToNextTab(tgt); | ||
| flag = true; | ||
| break; | ||
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| case "Home": | ||
| this.setSelectedTab(this.firstTab); | ||
| flag = true; | ||
| break; | ||
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| case "End": | ||
| this.setSelectedTab(this.lastTab); | ||
| flag = true; | ||
| break; | ||
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| default: | ||
| break; | ||
| } | ||
| } | ||
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| if (flag) { | ||
| event.stopPropagation(); | ||
| event.preventDefault(); | ||
| } | ||
| } | ||
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| onClick(event: MouseEvent) { | ||
| if (event.currentTarget instanceof HTMLElement) { | ||
| this.setSelectedTab(event.currentTarget); | ||
| } | ||
| } | ||
| } |