Collections (FS-Skia-UI) | FS-Skia-UI

Collections Module

Namespace: FS.Skia.UI.Controls
Assembly: FS.Skia.UI.Controls.dll

Virtualization model for large scrolling lists: `visibleRange`/`init`/`update` over `CollectionModel`.

Functions and values

Function or value	Description
`init controlId itemCount rowHeight viewportHeight` Full Usage: `init controlId itemCount rowHeight viewportHeight` Parameters: controlId : `ControlId` itemCount : `int` rowHeight : `float` viewportHeight : `float` Returns: `CollectionModel * CollectionEffect list`	Build the initial `CollectionModel` for a `controlId` and emit its first `CollectionEffect` list. controlId : `ControlId` itemCount : `int` rowHeight : `float` viewportHeight : `float` Returns: `CollectionModel * CollectionEffect list`
`update msg model` Full Usage: `update msg model` Parameters: msg : `CollectionMsg` model : `CollectionModel` Returns: `CollectionModel * CollectionEffect list`	Apply a `CollectionMsg` to the `CollectionModel`, returning the next model and any effects. msg : `CollectionMsg` model : `CollectionModel` Returns: `CollectionModel * CollectionEffect list`
`visibleRange rowHeight viewportHeight scrollOffset totalItems overscan` Full Usage: `visibleRange rowHeight viewportHeight scrollOffset totalItems overscan` Parameters: rowHeight : `float` viewportHeight : `float` scrollOffset : `float` totalItems : `int` overscan : `int` Returns: `VisibleRange`	Compute the realized `VisibleRange` from row height, viewport height, scroll offset, item total, and an `overscan` buffer (Feature 114, additive trailing parameter). `overscan = 0` reproduces the pre-feature visible slice byte-identically; a positive `overscan` shifts `FirstIndex` back by up to `overscan` and widens `Count` by up to `2 * overscan`, edge-clamped so no index is `< 0` or `>= totalItems`. Negative `overscan` is treated as 0. rowHeight : `float` viewportHeight : `float` scrollOffset : `float` totalItems : `int` overscan : `int` Returns: `VisibleRange`