Method _onListHeaderKeydown

packages/main/src/MultiComboBox.ts:1167–1193

(e: KeyboardEvent)

	}

	_onListHeaderKeydown(e: KeyboardEvent) {
		const isArrowDown = isDown(e);
		const isArrowUp = isUp(e);
		const isSelectAllFocused = (e.target as HTMLElement).classList.contains("ui5-mcb-select-all-checkbox");

		if (isTabNext(e) || isTabPrevious(e)) {
			this._onItemTab();
			return;
		}

		e.preventDefault();

		if (isArrowDown || isDownCtrl(e)) {
			if (this.showSelectAll && !isSelectAllFocused) {
				return (this._getResponsivePopover().querySelector(".ui5-mcb-select-all-checkbox") as CheckBox).focus();
			}

			this._handleArrowDown();
		}

		if (isArrowUp || isUpCtrl(e)) {
			if (e.target === this.valueStateHeader || (this.showSelectAll && isSelectAllFocused)) {
				this._shouldAutocomplete = true;
				return this._inputDom.focus();
			}
		}
	}

	_handleSelectAllCheckboxClick(e: CustomEvent) {
		if (!this.filterSelected) {