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|
use crate::{Align, Justify, Length};
use std::hash::{Hash, Hasher};
use stretch::{geometry, style};
/// The appearance of a [`Node`].
///
/// [`Node`]: struct.Node.html
#[derive(Debug, Clone, Copy)]
pub struct Style(pub(crate) style::Style);
impl Style {
/// Defines the width of a [`Node`].
///
/// [`Node`]: struct.Node.html
pub fn width(mut self, width: Length) -> Self {
self.0.size.width = length_to_dimension(width);
self
}
/// Defines the height of a [`Node`].
///
/// [`Node`]: struct.Node.html
pub fn height(mut self, height: Length) -> Self {
self.0.size.height = length_to_dimension(height);
self
}
/// Defines the minimum width of a [`Node`].
///
/// [`Node`]: struct.Node.html
pub fn min_width(mut self, min_width: Length) -> Self {
self.0.min_size.width = length_to_dimension(min_width);
self
}
/// Defines the maximum width of a [`Node`].
///
/// [`Node`]: struct.Node.html
pub fn max_width(mut self, max_width: Length) -> Self {
self.0.max_size.width = length_to_dimension(max_width);
self
}
/// Defines the minimum height of a [`Node`].
///
/// [`Node`]: struct.Node.html
pub fn min_height(mut self, min_height: Length) -> Self {
self.0.min_size.height = length_to_dimension(min_height);
self
}
/// Defines the maximum height of a [`Node`].
///
/// [`Node`]: struct.Node.html
pub fn max_height(mut self, max_height: Length) -> Self {
self.0.max_size.height = length_to_dimension(max_height);
self
}
pub(crate) fn align_items(mut self, align: Align) -> Self {
self.0.align_items = align.into();
self
}
pub(crate) fn justify_content(mut self, justify: Justify) -> Self {
self.0.justify_content = justify.into();
self
}
/// Sets the alignment of a [`Node`].
///
/// If the [`Node`] is inside a...
///
/// * [`Column`], this setting will affect its __horizontal__ alignment.
/// * [`Row`], this setting will affect its __vertical__ alignment.
///
/// [`Node`]: struct.Node.html
/// [`Column`]: widget/struct.Column.html
/// [`Row`]: widget/struct.Row.html
pub fn align_self(mut self, align: Option<Align>) -> Self {
self.0.align_self = match align {
Some(align) => align.into(),
None => stretch::style::AlignSelf::Auto,
};
self
}
/// Sets the padding of a [`Node`].
///
/// [`Node`]: struct.Node.html
pub fn padding(mut self, units: u16) -> Self {
self.0.padding = stretch::geometry::Rect {
start: style::Dimension::Points(units as f32),
end: style::Dimension::Points(units as f32),
top: style::Dimension::Points(units as f32),
bottom: style::Dimension::Points(units as f32),
};
self
}
}
fn length_to_dimension(length: Length) -> style::Dimension {
match length {
Length::Shrink => style::Dimension::Undefined,
Length::Fill => style::Dimension::Percent(1.0),
Length::Units(units) => style::Dimension::Points(units as f32),
}
}
impl Default for Style {
fn default() -> Style {
Style(style::Style {
align_items: style::AlignItems::FlexStart,
justify_content: style::JustifyContent::FlexStart,
..style::Style::default()
})
}
}
impl Hash for Style {
fn hash<H: Hasher>(&self, state: &mut H) {
hash_size(&self.0.size, state);
hash_size(&self.0.min_size, state);
hash_size(&self.0.max_size, state);
hash_rect(&self.0.margin, state);
(self.0.flex_direction as u8).hash(state);
(self.0.align_items as u8).hash(state);
(self.0.justify_content as u8).hash(state);
(self.0.align_self as u8).hash(state);
(self.0.flex_grow as u32).hash(state);
}
}
fn hash_size<H: Hasher>(
size: &geometry::Size<style::Dimension>,
state: &mut H,
) {
hash_dimension(size.width, state);
hash_dimension(size.height, state);
}
fn hash_rect<H: Hasher>(
rect: &geometry::Rect<style::Dimension>,
state: &mut H,
) {
hash_dimension(rect.start, state);
hash_dimension(rect.end, state);
hash_dimension(rect.top, state);
hash_dimension(rect.bottom, state);
}
fn hash_dimension<H: Hasher>(dimension: style::Dimension, state: &mut H) {
match dimension {
style::Dimension::Undefined => state.write_u8(0),
style::Dimension::Auto => state.write_u8(1),
style::Dimension::Points(points) => {
state.write_u8(2);
(points as u32).hash(state);
}
style::Dimension::Percent(percent) => {
state.write_u8(3);
(percent as u32).hash(state);
}
}
}
|
