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use std::ops::BitOr;
/// Interest used when creating a [stream] or a [subscription].
/// They indicate which preferences should be retrieved and monitored.
///
/// [stream]: `crate::Preferences::stream`
/// [subscription]: `crate::Preferences::subscribe`
#[derive(Debug, Default, Clone, Copy)]
pub struct Interest(u8);
macro_rules! impl_interest {
(impl $name:ident { $(#[cfg($cfg:meta)] $(#[$($meta:meta)*])* $vis:vis const $ident:ident: $ty:ty = $expr:expr;)* }) => {
#[allow(non_upper_case_globals)]
impl $name {
/// A shortcut for all available preferences.
///
/// Note that only the preferences that have their
/// corresponding feature enabled will actually be reported.
pub const All: $name = {
let mut value = 0;
$(
#[cfg($cfg)]
{
value |= Self::$ident.0;
}
)*
$name(value)
};
$(#[cfg($cfg)] $(#[$($meta)*])* $vis const $ident: $ty = $expr;)*
}
};
}
impl_interest! {
impl Interest {
#[cfg(feature = "color-scheme")]
/// Retrieve the [`ColorScheme`](`crate::ColorScheme`) preference
/// and store it in [`Preferences::color_scheme`](`crate::Preferences::color_scheme`).
pub const ColorScheme: Interest = Interest(1 << 0);
#[cfg(feature = "contrast")]
/// Retrieve the [`Contrast`](`crate::Contrast`) preference
/// and store it in [`Preferences::contrast`](`crate::Preferences::contrast`).
pub const Contrast: Interest = Interest(1 << 1);
#[cfg(feature = "reduced-motion")]
/// Retrieve the [`ReducedMotion`](`crate::ReducedMotion`) preference
/// and store it in [`Preferences::reduced_motion`](`crate::Preferences::reduced_motion`).
pub const ReducedMotion: Interest = Interest(1 << 2);
#[cfg(feature = "reduced-transparency")]
/// Retrieve the [`ReducedTransparency`](`crate::ReducedTransparency`) preference
/// and store it in [`Preferences::reduced_transparency`](`crate::Preferences::reduced_transparency`).
pub const ReducedTransparency: Interest = Interest(1 << 3);
#[cfg(feature = "accent-color")]
/// Retrieve the [`AccentColor`](`crate::AccentColor`) preference
/// and store it in [`Preferences::accent_color`](`crate::Preferences::accent_color`).
pub const AccentColor: Interest = Interest(1 << 4);
}
}
#[cfg(target_os = "macos")]
#[allow(non_upper_case_globals)]
impl Interest {
#[cfg(feature = "_macos-accessibility")]
pub(crate) const MacOSAccessibility: Interest = {
let mut value = 0;
#[cfg(feature = "contrast")]
{
value |= Interest::Contrast.0;
}
#[cfg(feature = "reduced-motion")]
{
value |= Interest::ReducedMotion.0;
}
#[cfg(feature = "reduced-transparency")]
{
value |= Interest::ReducedTransparency.0;
}
Interest(value)
};
}
impl Interest {
/// Tests if `self` is a superset of `other`.
/// In other words: Tests if all flags set in `other` are set in `self.
pub fn is(self, other: Self) -> bool {
(other.0 & self.0) == other.0
}
/// Tests if `self` is empty.
/// In other words: Tests if no flags are set.
pub fn is_empty(self) -> bool {
self.0 == 0
}
}
impl BitOr for Interest {
type Output = Interest;
fn bitor(self, rhs: Self) -> Self::Output {
Self(self.0 | rhs.0)
}
}