Struct PaintProjection 

pub struct PaintProjection(pub fn(&Theme, PaintState) -> Theme);

How a theme re-colours itself for a PaintState: registered in the theme’s extension registry and consulted by Theme::for_paint_state.

Absent, which is the default and what every raw-token theme and the IntUI preset get, means the generic chain: Theme::for_inactive_window when the window is inactive, then Theme::for_high_contrast when the high-contrast preference is set. That chain is a fixed transform of the tokens (desaturate the accent family, then lift the accent, the ring, the secondary text and the selection until they reach the high-contrast floors), which is right for a palette that defines no inactive or high-contrast colours of its own.

A preset whose source palette does define them (a desktop colour scheme with an inactive colour group, say) registers this to paint those colours instead. The function receives the active theme and the whole state at once, so it decides how the two flags combine; it replaces the generic chain entirely, and calling Theme::for_inactive_window or Theme::for_high_contrast from it is how it keeps a part of that chain. Only colours should change: the paint walker swaps the result in without a relayout, so geometry a hook changes is not honoured.

It lives in the extension registry for the reason DensityProjection does: it is optional, typed, non-serializable state only some themes carry.

Tuple Fields

0: fn(&Theme, PaintState) -> Theme

Trait Implementations

impl Clone for PaintProjection

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for PaintProjection

impl Debug for PaintProjection

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.