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// Take a look at the license at the top of the repository in the LICENSE file.
// rustdoc-stripper-ignore-next
//! Traits intended for subclassing [`StyleContext`](crate::StyleContext).
use glib::translate::*;
use crate::{prelude::*, subclass::prelude::*, StyleContext};
#[cfg_attr(feature = "v4_10", deprecated = "Since 4.10")]
#[allow(deprecated)]
pub trait StyleContextImpl: StyleContextImplExt + ObjectImpl {
fn changed(&self) {
self.parent_changed()
}
}
mod sealed {
pub trait Sealed {}
impl<T: super::StyleContextImplExt> Sealed for T {}
}
#[cfg_attr(feature = "v4_10", deprecated = "Since 4.10")]
#[allow(deprecated)]
pub trait StyleContextImplExt: sealed::Sealed + ObjectSubclass {
fn parent_changed(&self) {
unsafe {
let data = Self::type_data();
let parent_class = data.as_ref().parent_class() as *mut ffi::GtkStyleContextClass;
if let Some(f) = (*parent_class).changed {
f(self
.obj()
.unsafe_cast_ref::<StyleContext>()
.to_glib_none()
.0)
}
}
}
}
impl<T: StyleContextImpl> StyleContextImplExt for T {}
unsafe impl<T: StyleContextImpl> IsSubclassable<T> for StyleContext {
fn class_init(class: &mut glib::Class<Self>) {
Self::parent_class_init::<T>(class);
assert_initialized_main_thread!();
let klass = class.as_mut();
klass.changed = Some(style_context_changed::<T>);
}
}
unsafe extern "C" fn style_context_changed<T: StyleContextImpl>(ptr: *mut ffi::GtkStyleContext) {
let instance = &*(ptr as *mut T::Instance);
let imp = instance.imp();
imp.changed()
}