Method _onKeyDown

packages/main/src/TableVirtualizer.ts:236–283

(e: KeyboardEvent)

	}

	_onKeyDown(e: KeyboardEvent) {
		if (!this._table) {
			return;
		}

		let scrollTopChange = 0;
		const rows = this._table.rows;
		const firstRow = rows[0];
		const lastRow = rows[rows.length - 1];
		const hasDataBeforeFirstRow = firstRow.position !== 0;
		const hasDataAfterLastRow = lastRow.position !== this.rowCount - 1;
		const tableNavigation = this._table._tableNavigation!;
		const activeElement = getActiveElement() as HTMLElement;

		if (isTabNext(e) && hasDataAfterLastRow && getTabbableElements(this._rowsContainer).pop() === activeElement) {
			this._tabBlockingState = TabBlocking.Next;
			lastRow.attachInvalidate(this._onRowInvalidateBound);
			scrollTopChange = this.rowHeight;
		} else if (isTabPrevious(e) && hasDataBeforeFirstRow && getTabbableElements(this._rowsContainer).shift() === activeElement) {
			this._tabBlockingState = TabBlocking.Previous;
			firstRow.attachInvalidate(this._onRowInvalidateBound);
			scrollTopChange = this.rowHeight * -1;
		} else if (hasDataAfterLastRow && tableNavigation._getNavigationItemsOfRow(lastRow).includes(activeElement)) {
			if (isDown(e) || isDownShift(e)) {
				scrollTopChange = this.rowHeight;
			} else if (isPageDown(e)) {
				scrollTopChange = this._visibleRowCount * this.rowHeight;
			} else if (isEnd(e) && activeElement === lastRow) {
				scrollTopChange = this.rowCount * this.rowHeight;
			}
		} else if (hasDataBeforeFirstRow && tableNavigation._getNavigationItemsOfRow(firstRow).includes(activeElement)) {
			if (isUp(e) || isUpShift(e)) {
				scrollTopChange = this.rowHeight * -1;
			} else if (isPageUp(e)) {
				scrollTopChange = this._visibleRowCount * this.rowHeight * -1;
			} else if (isHome(e) && activeElement === firstRow) {
				scrollTopChange = this.rowCount * this.rowHeight * -1;
			}
		}

		if (scrollTopChange) {
			const scrollTop = this._table.scrollTop;
			this._scrollContainer.scrollTop += scrollTopChange;
			if (this._scrollContainer.scrollTop !== scrollTop) {
				e.preventDefault();
			}
		}
	}
}

TableVirtualizer.define();