Trait glow_glyph::GlyphPositioner

pub trait GlyphPositioner: Hash {
    fn calculate_glyphs<F, S>(
        &self, 
        fonts: &[F], 
        geometry: &SectionGeometry, 
        sections: &[S]
    ) -> Vec<SectionGlyph, Global>
    where
        F: Font,
        S: ToSectionText;
    fn bounds_rect(&self, geometry: &SectionGeometry) -> Rect;

    fn recalculate_glyphs<F, S, P>(
        &self, 
        previous: P, 
        change: GlyphChange, 
        fonts: &[F], 
        geometry: &SectionGeometry, 
        sections: &[S]
    ) -> Vec<SectionGlyph, Global>
    where
        F: Font,
        S: ToSectionText,
        P: IntoIterator<Item = SectionGlyph>,
    { ... }
}

Logic to calculate glyph positioning using Font, SectionGeometry and SectionText.

Required Methods

fn calculate_glyphs<F, S>(
    &self,
    fonts: &[F],
    geometry: &SectionGeometry,
    sections: &[S]
) -> Vec<SectionGlyph, Global> where
    F: Font,
    S: ToSectionText, 

Calculate a sequence of positioned glyphs to render. Custom implementations should return the same result when called with the same arguments to allow layout caching.

fn bounds_rect(&self, geometry: &SectionGeometry) -> Rect

Return a screen rectangle according to the requested render position and bounds appropriate for the glyph layout.

Provided Methods

fn recalculate_glyphs<F, S, P>(
    &self,
    previous: P,
    change: GlyphChange,
    fonts: &[F],
    geometry: &SectionGeometry,
    sections: &[S]
) -> Vec<SectionGlyph, Global> where
    F: Font,
    S: ToSectionText,
    P: IntoIterator<Item = SectionGlyph>, 

Recalculate a glyph sequence after a change.

The default implementation simply calls calculate_glyphs so must be implemented to provide benefits as such benefits are spefic to the internal layout logic.

Implementors

impl<L> GlyphPositioner for Layout<L> where
    L: LineBreaker,