DirectionOpt sets the scroll direction.

Default is [Vertical].

func DirectionOpt(d ScrollDirection) Option {
	return func(c *config) {
		c.direction = d
	}
}

OnScroll sets the callback invoked when the scroll position changes.

The callback receives the new (scrollX, scrollY) offsets.

func OnScroll(fn func(x, y float32)) Option {
	return func(c *config) {
		c.onScroll = fn
	}
}

PainterOpt sets the painter used to render the scrollbar.

Each design system provides its own painter. If not set,

[DefaultPainter] is used.

func PainterOpt(p Painter) Option {
	return func(c *config) {
		c.painter = p
	}
}

ScrollStep sets the number of pixels scrolled per wheel tick.

Default is 40 pixels.

func ScrollStep(step float32) Option {
	return func(c *config) {
		c.scrollStep = step
	}
}

ScrollX sets the initial horizontal scroll offset.

func ScrollX(x float32) Option {
	return func(c *config) {
		c.scrollX = x
	}
}

ScrollXReadonlySignal binds the horizontal scroll offset to a read-only signal.

When set, this takes highest precedence over all other scrollX sources.

func ScrollXReadonlySignal(sig state.ReadonlySignal[float32]) Option {
	return func(c *config) {
		c.readonlyScrollXSignal = sig
	}
}

ScrollXSignal binds the horizontal scroll offset to a reactive signal.

This is a TWO-WAY binding: the widget reads the offset from the signal,

and when the user scrolls, the new offset is written back to the signal.

func ScrollXSignal(sig state.Signal[float32]) Option {
	return func(c *config) {
		c.scrollXSignal = sig
	}
}

ScrollY sets the initial vertical scroll offset.

func ScrollY(y float32) Option {
	return func(c *config) {
		c.scrollY = y
	}
}

ScrollYReadonlySignal binds the vertical scroll offset to a read-only signal.

When set, this takes highest precedence over all other scrollY sources.

func ScrollYReadonlySignal(sig state.ReadonlySignal[float32]) Option {
	return func(c *config) {
		c.readonlyScrollYSignal = sig
	}
}

ScrollYSignal binds the vertical scroll offset to a reactive signal.

This is a TWO-WAY binding: the widget reads the offset from the signal,

and when the user scrolls, the new offset is written back to the signal.

func ScrollYSignal(sig state.Signal[float32]) Option {
	return func(c *config) {
		c.scrollYSignal = sig
	}
}

ScrollbarOpt sets the scrollbar visibility mode.

Default is [ScrollbarAuto].

func ScrollbarOpt(v ScrollbarVisibility) Option {
	return func(c *config) {
		c.scrollbar = v
	}
}