87 lines
2.5 KiB
Rust
87 lines
2.5 KiB
Rust
//! Styles for layouting.
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use crate::font::FontClass;
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use crate::size::{Size, Size2D, SizeBox};
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/// Default styles for text.
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#[derive(Debug, Clone)]
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pub struct TextStyle {
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/// The classes the font we want has to be part of.
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pub classes: Vec<FontClass>,
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/// A sequence of classes. We need the font to be part of at least one of these
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/// and preferably the leftmost possible.
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pub fallback: Vec<FontClass>,
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/// The font size.
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pub font_size: f32,
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/// The line spacing (as a multiple of the font size).
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pub line_spacing: f32,
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/// The paragraphs spacing (as a multiple of the line spacing).
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pub paragraph_spacing: f32,
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}
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impl TextStyle {
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/// Toggle a class.
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///
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/// If the class was one of _italic_ or _bold_, then:
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/// - If it was not present, the _regular_ class will be removed.
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/// - If it was present, the _regular_ class will be added in case the
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/// other style class is not present.
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pub fn toggle_class(&mut self, class: FontClass) {
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if self.classes.contains(&class) {
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self.classes.retain(|x| x != &class);
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if (class == FontClass::Italic && !self.classes.contains(&FontClass::Bold))
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|| (class == FontClass::Bold && !self.classes.contains(&FontClass::Italic)) {
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self.classes.push(FontClass::Regular);
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}
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} else {
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if class == FontClass::Italic || class == FontClass::Bold {
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self.classes.retain(|x| x != &FontClass::Regular);
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}
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self.classes.push(class);
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}
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}
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}
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impl Default for TextStyle {
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fn default() -> TextStyle {
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use FontClass::*;
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TextStyle {
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classes: vec![Regular],
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fallback: vec![Serif],
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font_size: 11.0,
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line_spacing: 1.2,
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paragraph_spacing: 1.5,
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}
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}
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}
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/// Default styles for pages.
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#[derive(Debug, Clone)]
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pub struct PageStyle {
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/// Width and height of the page.
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pub dimensions: Size2D,
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/// The amount of white space on each side.
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pub margins: SizeBox,
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}
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impl Default for PageStyle {
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fn default() -> PageStyle {
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PageStyle {
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// A4 paper.
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dimensions: Size2D {
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x: Size::mm(210.0),
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y: Size::mm(297.0),
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},
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// All the same margins.
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margins: SizeBox {
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left: Size::cm(2.5),
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top: Size::cm(2.5),
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right: Size::cm(2.5),
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bottom: Size::cm(2.5),
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},
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}
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}
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}
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