filmstrip-compose-ui/dev.jordond.filmstrip.compose.ui.geometry/StripGrid

StripGrid

class StripGrid(val scale: TimelineScale, val tileWidthPx: Int)(source)

Which source times the strip's tiles sit at, and which of them are on screen.

Tiles are addressed in content pixels, so a tile keeps the source time it shows no matter how far the strip has scrolled. positions feeds rememberFilmstripFrames and visibleRange feeds FilmstripFrames.onVisibleRange .

val grid = remember(scale, tileWidthPx) { StripGrid(scale, tileWidthPx) }
val frames = rememberFilmstripFrames(filmstrip, composition, grid.positions, heightPx)

// Only a strip drawn by hand needs this. FilmstripStrip reports its own window.
LaunchedEffect(grid, frames) {
  snapshotFlow { listState.stripScrollPx(grid) }.collect { scrollPx ->
    val window = grid.visibleRange(scrollPx, viewportWidthPx)
    if (!window.isEmpty()) frames.onVisibleRange(window.first, window.last)
  }
}