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//! Change the appearance of a scrollable.
use crate::container;
use crate::core::{Background, Border, Color};
/// The appearance of a scrolable.
#[derive(Debug, Clone, Copy)]
pub struct Appearance {
/// The [`container::Appearance`] of a scrollable.
pub container: container::Appearance,
/// The [`Scrollbar`] appearance.
pub scrollbar: Scrollbar,
/// The [`Background`] of the gap between a horizontal and vertical scrollbar.
pub gap: Option<Background>,
}
/// The appearance of the scrollbar of a scrollable.
#[derive(Debug, Clone, Copy)]
pub struct Scrollbar {
/// The [`Background`] of a scrollbar.
pub background: Option<Background>,
/// The [`Border`] of a scrollbar.
pub border: Border,
/// The appearance of the [`Scroller`] of a scrollbar.
pub scroller: Scroller,
}
/// The appearance of the scroller of a scrollable.
#[derive(Debug, Clone, Copy)]
pub struct Scroller {
/// The [`Color`] of the scroller.
pub color: Color,
/// The [`Border`] of the scroller.
pub border: Border,
}
/// A set of rules that dictate the style of a scrollable.
pub trait StyleSheet {
/// The supported style of the [`StyleSheet`].
type Style: Default;
/// Produces the [`Appearance`] of an active scrollable.
fn active(&self, style: &Self::Style) -> Appearance;
/// Produces the [`Appearance`] of a scrollable when it is being hovered.
fn hovered(
&self,
style: &Self::Style,
is_mouse_over_scrollbar: bool,
) -> Appearance;
/// Produces the [`Appearance`] of a scrollable when it is being dragged.
fn dragging(&self, style: &Self::Style) -> Appearance {
self.hovered(style, true)
}
}
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