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