BackgroundSchema

Fill applied to a tile by StyleSchema.background. Each variant maps 1:1 to a Compose Brush factory and is applied through Modifier.background(brush, alpha = alpha).

Variants:

• SolidColor → SolidColor — the default, a single ColorSchema.

• LinearGradient → Brush.linearGradient — arbitrary start/end points.

• HorizontalGradient → Brush.horizontalGradient — linear along the X axis.

• VerticalGradient → Brush.verticalGradient — linear along the Y axis.

• RadialGradient → Brush.radialGradient — circular, from a center point.

• SweepGradient → Brush.sweepGradient — angular, starting at 3 o'clock and going clockwise.

null means "Compose default": since the tile size is unknown server-side, unspecified geometry is sent as null and resolved at draw time: | field | null resolves to | |---|---| | end (linear) | Offset.Infinite — bottom-end corner | | endX / endY | Float.POSITIVE_INFINITY — far edge | | center (radial/sweep) | Offset.Unspecified — center of the tile | | radius (radial) | Float.POSITIVE_INFINITY — largest radius that fits |

All dimensions are Int in dp, like every other dimension in Mosaic.

alpha is a 0f..1f multiplier applied to the whole fill, on top of any alpha already carried by the colors themselves.

DSL helpers (mosaic-server):

background(color(themeColorSurface()))                       // shorthand for SolidColor
background(solidColor(color(themeColorSurface()), alpha = 0.5f))
background(verticalGradient(0f to color(...), 1f to color(...)))
background(linearGradient(listOf(color(...), color(...))))   // evenly spread
background(radialGradient(listOf(color(...), color(...)), center = offset(40, 40), radius = 80))
background(sweepGradient(listOf(color(...), color(...), color(...))))

Note: blur is not supported yet.

Inheritors