computeScrollYForRow
Computes the vertical translation that pins a row at the fixed focus line
Available since @roku-sdk/flex-grid 3.3.0
import { computeScrollYForRow } from "@roku-sdk/flex-grid/geometry";Also exported as computeScrollYForRow from @roku-sdk/flex-grid (deprecated).
Deprecated: computeScrollYForRow. Import from @roku-sdk/flex-grid/geometry instead. The root export will be removed in the next major version.
computeScrollYForRow(targetRow: number, params: FixedFocusYParams): numberDescription
Computes the vertical translation that pins a row at the fixed focus line.
Use this helper in a custom VerticalFocusStrategyPlugin or geometry-aware InitGridPlugin. Import it from @roku-sdk/flex-grid/geometry.
Content that fits the viewport, including zero rows, returns containerY. Rows at or beyond the end-zone start use the end-zone translation. Negative targets are not clamped and are passed to getRowY; callers should resolve looping targets into data-row indices first.
Parameters
| Name | Type | Description |
|---|---|---|
targetRow | number | Target data-row index, as a zero-based integer. |
params | FixedFocusYParams | Viewport and row geometry in pixels, with non-decreasing row positions. |
Return values
The vertical content translation in pixels.
Example
computeScrollYForRow(1, { containerY: 50, viewportHeight: 200, numRows: 4, getRowY: r => r * 100, getRowHeight: () => 100 }); // -50Updated about 5 hours ago