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use std::rc::Rc;
use fontdock::{fallback, FallbackTree, FontStretch, FontStyle, FontVariant, FontWeight};
use crate::geom::*;
use crate::layout::VerticalFontMetric;
use crate::paper::{Paper, PaperClass, PAPER_A4};
/// The evaluation state.
#[derive(Debug, Clone, PartialEq)]
pub struct State {
/// The current directions along which layouts are placed in their parents.
pub dirs: LayoutDirs,
/// The current alignments of layouts in their parents.
pub aligns: LayoutAligns,
/// The current page settings.
pub page: PageState,
/// The current paragraph settings.
pub par: ParState,
/// The current font settings.
pub font: FontState,
}
impl Default for State {
fn default() -> Self {
Self {
dirs: LayoutDirs::new(Dir::TTB, Dir::LTR),
aligns: LayoutAligns::new(Align::Start, Align::Start),
page: PageState::default(),
par: ParState::default(),
font: FontState::default(),
}
}
}
/// Defines page properties.
#[derive(Debug, Copy, Clone, PartialEq)]
pub struct PageState {
/// The class of this page.
pub class: PaperClass,
/// The width and height of the page.
pub size: Size,
/// The amount of white space on each side of the page. If a side is set to
/// `None`, the default for the paper class is used.
pub margins: Sides<Option<Linear>>,
}
impl PageState {
/// The default page style for the given paper.
pub fn new(paper: Paper) -> Self {
Self {
class: paper.class,
size: paper.size(),
margins: Sides::uniform(None),
}
}
/// The margins.
pub fn margins(&self) -> Sides<Linear> {
let default = self.class.default_margins();
Sides {
left: self.margins.left.unwrap_or(default.left),
top: self.margins.top.unwrap_or(default.top),
right: self.margins.right.unwrap_or(default.right),
bottom: self.margins.bottom.unwrap_or(default.bottom),
}
}
}
impl Default for PageState {
fn default() -> Self {
Self::new(PAPER_A4)
}
}
/// Defines paragraph properties.
#[derive(Debug, Copy, Clone, PartialEq)]
pub struct ParState {
/// The spacing between paragraphs (dependent on scaled font size).
pub spacing: Linear,
/// The spacing between lines (dependent on scaled font size).
pub leading: Linear,
/// The spacing between words (dependent on scaled font size).
pub word_spacing: Linear,
}
impl Default for ParState {
fn default() -> Self {
Self {
spacing: Relative::new(1.0).into(),
leading: Relative::new(0.5).into(),
word_spacing: Relative::new(0.25).into(),
}
}
}
/// Defines font properties.
#[derive(Debug, Clone, PartialEq)]
pub struct FontState {
/// A tree of font family names and generic class names.
pub families: Rc<FallbackTree>,
/// The selected font variant.
pub variant: FontVariant,
/// The font size.
pub size: Length,
/// The linear to apply on the base font size.
pub scale: Linear,
/// The top end of the text bounding box.
pub top_edge: VerticalFontMetric,
/// The bottom end of the text bounding box.
pub bottom_edge: VerticalFontMetric,
/// Whether the strong toggle is active or inactive. This determines
/// whether the next `*` adds or removes font weight.
pub strong: bool,
/// Whether the emphasis toggle is active or inactive. This determines
/// whether the next `_` makes italic or non-italic.
pub emph: bool,
}
impl FontState {
/// Access the `families` mutably.
pub fn families_mut(&mut self) -> &mut FallbackTree {
Rc::make_mut(&mut self.families)
}
/// The absolute font size.
pub fn font_size(&self) -> Length {
self.scale.resolve(self.size)
}
}
impl Default for FontState {
fn default() -> Self {
Self {
// The default tree of font fallbacks.
families: Rc::new(fallback! {
list: [],
classes: { "monospace" => ["inconsolata"] },
base: ["eb garamond", "twitter color emoji"],
}),
variant: FontVariant {
style: FontStyle::Normal,
weight: FontWeight::REGULAR,
stretch: FontStretch::Normal,
},
size: Length::pt(11.0),
top_edge: VerticalFontMetric::CapHeight,
bottom_edge: VerticalFontMetric::Baseline,
scale: Linear::ONE,
strong: false,
emph: false,
}
}
}
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