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Webcomponents for creating Visual Studio Code extensions
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{html, TemplateResult} from 'lit';\nimport {\n customElement,\n property,\n queryAssignedElements,\n state,\n} from 'lit/decorators.js';\nimport {VscElement} from '../includes/VscElement.js';\nimport {VscodeRadio} from '../vscode-radio/index.js';\nimport styles from './vscode-radio-group.styles.js';\n\n@customElement('vscode-radio-group')\nexport class VscodeRadioGroup extends VscElement {\n static styles = styles;\n\n @property({reflect: true})\n variant: 'horizontal' | 'vertical' = 'horizontal';\n\n /** @internal */\n @property({reflect: true})\n role = 'radiogroup';\n\n connectedCallback(): void {\n super.connectedCallback();\n\n this.addEventListener('keydown', this._onKeyDownBound);\n }\n\n disconnectedCallback(): void {\n super.disconnectedCallback();\n\n this.removeEventListener('keydown', this._onKeyDownBound);\n }\n\n @queryAssignedElements({selector: 'vscode-radio'})\n private _radios!: VscodeRadio[];\n\n @state()\n private _focusedRadio = -1;\n\n @state()\n private _checkedRadio = -1;\n\n private _firstContentLoaded = false;\n\n private _uncheckPreviousChecked(prevChecked: number, prevFocused: number) {\n if (prevChecked !== -1) {\n this._radios[prevChecked].checked = false;\n }\n\n if (prevFocused !== -1) {\n this._radios[prevFocused].tabIndex = -1;\n }\n }\n\n private _afterCheck() {\n this._focusedRadio = this._checkedRadio;\n this._radios[this._checkedRadio].checked = true;\n this._radios[this._checkedRadio].tabIndex = 0;\n this._radios[this._checkedRadio].focus();\n }\n\n private _checkPrev() {\n const prevChecked = this._radios.findIndex((r) => r.checked);\n const prevFocused = this._radios.findIndex((r) => r.focused);\n const startPos = prevFocused !== -1 ? prevFocused : prevChecked;\n\n this._uncheckPreviousChecked(prevChecked, prevFocused);\n\n if (startPos === -1) {\n this._checkedRadio = this._radios.length - 1;\n } else if (startPos - 1 >= 0) {\n this._checkedRadio = startPos - 1;\n } else {\n this._checkedRadio = this._radios.length - 1;\n }\n\n this._afterCheck();\n }\n\n private _checkNext() {\n const prevChecked = this._radios.findIndex((r) => r.checked);\n const prevFocused = this._radios.findIndex((r) => r.focused);\n const startPos = prevFocused !== -1 ? prevFocused : prevChecked;\n\n this._uncheckPreviousChecked(prevChecked, prevFocused);\n\n if (startPos === -1) {\n this._checkedRadio = 0;\n } else if (startPos + 1 < this._radios.length) {\n this._checkedRadio = startPos + 1;\n } else {\n this._checkedRadio = 0;\n }\n\n this._afterCheck();\n }\n\n private _onKeyDown(ev: KeyboardEvent) {\n const {key} = ev;\n const listenedKeys = ['ArrowLeft', 'ArrowUp', 'ArrowRight', 'ArrowDown'];\n\n if (listenedKeys.includes(key)) {\n ev.preventDefault();\n }\n\n if (key === 'ArrowRight' || key === 'ArrowDown') {\n this._checkNext();\n }\n\n if (key === 'ArrowLeft' || key === 'ArrowUp') {\n this._checkPrev();\n }\n }\n\n private _onKeyDownBound = this._onKeyDown.bind(this);\n\n private _onChange(ev: CustomEvent) {\n const clickedIndex = this._radios.findIndex((r) => r === ev.target);\n\n if (clickedIndex !== -1) {\n if (this._focusedRadio !== -1) {\n this._radios[this._focusedRadio].tabIndex = -1;\n }\n\n if (this._checkedRadio !== -1 && this._checkedRadio !== clickedIndex) {\n this._radios[this._checkedRadio].checked = false;\n }\n\n this._focusedRadio = clickedIndex;\n this._checkedRadio = clickedIndex;\n this._radios[clickedIndex].tabIndex = 0;\n }\n }\n\n private _onSlotChange() {\n if (!this._firstContentLoaded) {\n const autoFocusedRadio = this._radios.findIndex((r) => r.autofocus);\n\n if (autoFocusedRadio > -1) {\n this._focusedRadio = autoFocusedRadio;\n }\n\n this._firstContentLoaded = true;\n }\n\n this._radios.forEach(\n (r, i) => {\n // if _focusedRadio is not set, the first radio should be focusable\n if (this._focusedRadio > -1) {\n r.tabIndex = i === this._focusedRadio ? 0 : -1\n } else {\n r.tabIndex = i === 0 ? 0 : -1;\n }\n }\n );\n }\n\n render(): TemplateResult {\n return html`\n \n \n \n `;\n }\n}\n\ndeclare global {\n interface HTMLElementTagNameMap {\n 'vscode-radio-group': VscodeRadioGroup;\n }\n}\n"]}