MayaFlux::Portal::Forma::LayoutCursor Class Reference

Reactive Y-position accumulator for vertical primitive stacking. More...

#include <LayoutCursor.hpp>

Collaboration diagram for MayaFlux::Portal::Forma::LayoutCursor:

Public Member Functions
Kinesis::AABB2D	advance (float height)
	Advance the cursor downward by height and return the NDC AABB occupied by the primitive just placed, scoped to the cursor's column extents.
void	bind_scroll (std::shared_ptr< MappedState< glm::vec2 > > offset)
	Bind a live scroll offset.
	LayoutCursor ()
	LayoutCursor (float y_start, float x_min=-1.F, float x_max=1.F)
	Construct a cursor at y_start scoped to a horizontal column.
void	reset (float y_start=1.F)
	Reset to y_start.
const std::shared_ptr< MappedState< glm::vec2 > > &	scroll_offset () const
	The bound scroll offset, or nullptr if none was bound.
void	skip (float height)
	Advance without returning bounds.
std::shared_ptr< MappedState< float > >	state () const
	Shared baseline state.
void	sync_to (LayoutCursor &other)
	Reset both cursors to the lower of their two current Y values.
float	x_max () const noexcept
float	x_min () const noexcept
float	y () const

Private Attributes
std::shared_ptr< MappedState< glm::vec2 > >	m_scroll_offset
std::shared_ptr< MappedState< float > >	m_state
float	m_x_max { 1.F }
float	m_x_min { -1.F }

Detailed Description

Reactive Y-position accumulator for vertical primitive stacking.

Holds a shared MappedState<float> carrying the current NDC Y baseline. Any primitive whose GeometryFn closes over the state pointer will reflow automatically when the cursor advances, via the normal version-bump path.

NDC Y runs +1 (top) to -1 (bottom). advance() subtracts height.

Default construction places the cursor at the top of the screen (y=1). This matches the most common starting position and allows LayoutCursor to be a plain member of structs that use aggregate or value initialization.

Definition at line 20 of file LayoutCursor.hpp.

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The documentation for this class was generated from the following file:

• LayoutCursor.hpp