gtk4/subclass/
style_context.rs

1// Take a look at the license at the top of the repository in the LICENSE file.
2
3// rustdoc-stripper-ignore-next
4//! Traits intended for subclassing [`StyleContext`](crate::StyleContext).
5
6use glib::translate::*;
7
8use crate::{ffi, prelude::*, subclass::prelude::*, StyleContext};
9
10#[cfg_attr(feature = "v4_10", deprecated = "Since 4.10")]
11#[allow(deprecated)]
12pub trait StyleContextImpl: StyleContextImplExt + ObjectImpl {
13    fn changed(&self) {
14        self.parent_changed()
15    }
16}
17
18mod sealed {
19    pub trait Sealed {}
20    impl<T: super::StyleContextImplExt> Sealed for T {}
21}
22
23#[cfg_attr(feature = "v4_10", deprecated = "Since 4.10")]
24#[allow(deprecated)]
25pub trait StyleContextImplExt: sealed::Sealed + ObjectSubclass {
26    fn parent_changed(&self) {
27        unsafe {
28            let data = Self::type_data();
29            let parent_class = data.as_ref().parent_class() as *mut ffi::GtkStyleContextClass;
30            if let Some(f) = (*parent_class).changed {
31                f(self
32                    .obj()
33                    .unsafe_cast_ref::<StyleContext>()
34                    .to_glib_none()
35                    .0)
36            }
37        }
38    }
39}
40
41impl<T: StyleContextImpl> StyleContextImplExt for T {}
42
43unsafe impl<T: StyleContextImpl> IsSubclassable<T> for StyleContext {
44    fn class_init(class: &mut glib::Class<Self>) {
45        Self::parent_class_init::<T>(class);
46
47        assert_initialized_main_thread!();
48        let klass = class.as_mut();
49        klass.changed = Some(style_context_changed::<T>);
50    }
51}
52
53unsafe extern "C" fn style_context_changed<T: StyleContextImpl>(ptr: *mut ffi::GtkStyleContext) {
54    let instance = &*(ptr as *mut T::Instance);
55    let imp = instance.imp();
56
57    imp.changed()
58}