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|
//! Change the apperance of a button.
use iced_core::{Background, BorderRadius, Color, Vector};
/// The appearance of a button.
#[derive(Debug, Clone, Copy)]
pub struct Appearance {
/// The amount of offset to apply to the shadow of the button.
pub shadow_offset: Vector,
/// The [`Background`] of the button.
pub background: Option<Background>,
/// The border radius of the button.
pub border_radius: BorderRadius,
/// The border width of the button.
pub border_width: f32,
/// The border [`Color`] of the button.
pub border_color: Color,
/// The text [`Color`] of the button.
pub text_color: Color,
}
impl std::default::Default for Appearance {
fn default() -> Self {
Self {
shadow_offset: Vector::default(),
background: None,
border_radius: 0.0.into(),
border_width: 0.0,
border_color: Color::TRANSPARENT,
text_color: Color::BLACK,
}
}
}
/// A set of rules that dictate the style of a button.
pub trait StyleSheet {
/// The supported style of the [`StyleSheet`].
type Style: Default;
/// Produces the active [`Appearance`] of a button.
fn active(&self, style: &Self::Style) -> Appearance;
/// Produces the hovered [`Appearance`] of a button.
fn hovered(&self, style: &Self::Style) -> Appearance {
let active = self.active(style);
Appearance {
shadow_offset: active.shadow_offset + Vector::new(0.0, 1.0),
..active
}
}
/// Produces the pressed [`Appearance`] of a button.
fn pressed(&self, style: &Self::Style) -> Appearance {
Appearance {
shadow_offset: Vector::default(),
..self.active(style)
}
}
/// Produces the disabled [`Appearance`] of a button.
fn disabled(&self, style: &Self::Style) -> Appearance {
let active = self.active(style);
Appearance {
shadow_offset: Vector::default(),
background: active.background.map(|background| match background {
Background::Color(color) => Background::Color(Color {
a: color.a * 0.5,
..color
}),
Background::Gradient(gradient) => {
Background::Gradient(gradient.mul_alpha(0.5))
}
}),
text_color: Color {
a: active.text_color.a * 0.5,
..active.text_color
},
..active
}
}
}
|
