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{ registerFeature } from \"../FeaturesRegistry.js\";\nimport { isF6Next, isF6Previous } from \"../Keys.js\";\nimport { instanceOfUI5Element } from \"../UI5Element.js\";\nimport { getFirstFocusableElement } from \"../util/FocusableElements.js\";\nimport getFastNavigationGroups from \"../util/getFastNavigationGroups.js\";\nimport isElementClickable from \"../util/isElementClickable.js\";\n\nclass F6Navigation {\n\tstatic _instance: F6Navigation;\n\tkeydownHandler: (event: KeyboardEvent) => void;\n\tselectedGroup: HTMLElement | null = null;\n\tgroups: Array = [];\n\n\tconstructor() {\n\t\tthis.keydownHandler = this._keydownHandler.bind(this) as (event: KeyboardEvent) => void;\n\t\tthis.attachEventListeners();\n\t}\n\n\tattachEventListeners() {\n\t\tdocument.addEventListener(\"keydown\", this.keydownHandler);\n\t}\n\n\tasync groupElementToFocus(nextElement: HTMLElement) {\n\t\tconst nextElementDomRef = instanceOfUI5Element(nextElement) ? nextElement.getDomRef() : nextElement;\n\n\t\tif (nextElementDomRef) {\n\t\t\tif (isElementClickable(nextElementDomRef)) {\n\t\t\t\treturn nextElementDomRef;\n\t\t\t}\n\n\t\t\tconst elementToFocus = await getFirstFocusableElement(nextElementDomRef);\n\n\t\t\tif (elementToFocus) {\n\t\t\t\treturn elementToFocus;\n\t\t\t}\n\t\t}\n\t}\n\n\tasync findNextFocusableGroupElement(currentIndex: number) {\n\t\tlet elementToFocus;\n\n\t\t/* eslint-disable no-await-in-loop */\n\t\tfor (let index = 0; index < this.groups.length; index++) {\n\t\t\tlet nextElement;\n\n\t\t\tif (currentIndex > -1) {\n\t\t\t\tif (currentIndex + 1 >= this.groups.length) {\n\t\t\t\t\tcurrentIndex = 0;\n\t\t\t\t\tnextElement = this.groups[currentIndex];\n\t\t\t\t} else {\n\t\t\t\t\tcurrentIndex += 1;\n\t\t\t\t\tnextElement = this.groups[currentIndex];\n\t\t\t\t}\n\t\t\t} else {\n\t\t\t\tcurrentIndex = 0;\n\t\t\t\tnextElement = this.groups[currentIndex];\n\t\t\t}\n\n\t\t\telementToFocus = await this.groupElementToFocus(nextElement);\n\n\t\t\tif (elementToFocus) {\n\t\t\t\tbreak;\n\t\t\t}\n\t\t}\n\t\t/* eslint-enable no-await-in-loop */\n\n\t\treturn elementToFocus;\n\t}\n\n\tasync findPreviousFocusableGroupElement(currentIndex: number) {\n\t\tlet elementToFocus;\n\n\t\t/* eslint-disable no-await-in-loop */\n\t\tfor (let index = 0; index < this.groups.length; index++) {\n\t\t\tlet nextElement;\n\n\t\t\tif (currentIndex > 0) {\n\t\t\t\t// Handle the situation where the first focusable element of two neighbor groups is the same\n\t\t\t\t// For example:\n\t\t\t\t// \n\t\t\t\t//     \n\t\t\t\t//         List Item\n\t\t\t\t//     \n\t\t\t\t// \n\t\t\t\t// Here for both FCL & List the firstFoccusableElement is the same (the ui5-li)\n\t\t\t\tconst firstFocusable = await this.groupElementToFocus(this.groups[currentIndex - 1]);\n\t\t\t\tconst shouldSkipParent = firstFocusable === await this.groupElementToFocus(this.groups[currentIndex]);\n\n\t\t\t\tcurrentIndex = shouldSkipParent ? currentIndex - 2 : currentIndex - 1;\n\n\t\t\t\tif (currentIndex < 0) {\n\t\t\t\t\tcurrentIndex = this.groups.length - 1;\n\t\t\t\t}\n\n\t\t\t\tnextElement = this.groups[currentIndex];\n\t\t\t} else {\n\t\t\t\tcurrentIndex = this.groups.length - 1;\n\t\t\t\tnextElement = this.groups[currentIndex];\n\t\t\t}\n\n\t\t\telementToFocus = await this.groupElementToFocus(nextElement);\n\n\t\t\tif (elementToFocus) {\n\t\t\t\tbreak;\n\t\t\t}\n\t\t}\n\t\t/* eslint-enable no-await-in-loop */\n\n\t\treturn elementToFocus;\n\t}\n\n\tasync _keydownHandler(event: KeyboardEvent) {\n\t\tconst forward = isF6Next(event);\n\t\tconst backward = isF6Previous(event);\n\t\tif (!(forward || backward)) {\n\t\t\treturn;\n\t\t}\n\n\t\tthis.updateGroups();\n\n\t\tif (this.groups.length < 1) {\n\t\t\treturn;\n\t\t}\n\n\t\tevent.preventDefault();\n\n\t\tlet elementToFocus;\n\n\t\tif (this.groups.length === 0) {\n\t\t\telementToFocus = await this.groupElementToFocus(this.groups[0]);\n\n\t\t\treturn elementToFocus?.focus();\n\t\t}\n\n\t\tlet currentIndex = -1;\n\n\t\tif (this.selectedGroup) {\n\t\t\tcurrentIndex = this.groups.indexOf(this.selectedGroup);\n\t\t}\n\n\t\tif (forward) {\n\t\t\telementToFocus = await this.findNextFocusableGroupElement(currentIndex);\n\t\t}\n\n\t\tif (backward) {\n\t\t\telementToFocus = await this.findPreviousFocusableGroupElement(currentIndex);\n\t\t}\n\n\t\telementToFocus?.focus();\n\t}\n\n\tremoveEventListeners() {\n\t\tdocument.removeEventListener(\"keydown\", this.keydownHandler);\n\t}\n\n\tupdateGroups() {\n\t\tthis.setSelectedGroup();\n\t\tthis.groups = getFastNavigationGroups(document.body);\n\t}\n\n\tsetSelectedGroup(root: DocumentOrShadowRoot = window.document) {\n\t\tconst htmlElement = window.document.querySelector(\"html\");\n\t\tlet element: Element | null | ParentNode = this.deepActive(root);\n\n\t\twhile (element && (element as Element).getAttribute(\"data-sap-ui-fastnavgroup\") !== \"true\" && element !== htmlElement) {\n\t\t\telement = element.parentElement ? element.parentNode : (element.parentNode as ShadowRoot).host;\n\t\t}\n\n\t\tthis.selectedGroup = element as HTMLElement;\n\t}\n\n\tdeepActive(root: DocumentOrShadowRoot): Element | null {\n\t\tif (root?.activeElement?.shadowRoot?.activeElement) {\n\t\t\treturn this.deepActive(root.activeElement.shadowRoot);\n\t\t}\n\n\t\treturn root.activeElement;\n\t}\n\n\tdestroy() {\n\t\tthis.removeEventListeners();\n\t}\n\n\tstatic init() {\n\t\tif (!this._instance) {\n\t\t\tthis._instance = new F6Navigation();\n\t\t}\n\n\t\treturn this._instance;\n\t}\n}\n\nregisterFeature(\"F6Navigation\", F6Navigation);\n\nexport default F6Navigation;\n"]}