1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
use crate::subclass::prelude::*;
use crate::StyleContext;
use glib::translate::*;
use glib::Cast;
pub trait StyleContextImpl: StyleContextImplExt + ObjectImpl {
fn changed(&self, style_context: &Self::Type) {
self.parent_changed(style_context)
}
}
pub trait StyleContextImplExt: ObjectSubclass {
fn parent_changed(&self, style_context: &Self::Type);
}
impl<T: StyleContextImpl> StyleContextImplExt for T {
fn parent_changed(&self, style_context: &Self::Type) {
unsafe {
let data = T::type_data();
let parent_class = data.as_ref().parent_class() as *mut ffi::GtkStyleContextClass;
if let Some(f) = (*parent_class).changed {
f(style_context
.unsafe_cast_ref::<StyleContext>()
.to_glib_none()
.0)
}
}
}
}
unsafe impl<T: StyleContextImpl> IsSubclassable<T> for StyleContext {
fn class_init(class: &mut glib::Class<Self>) {
Self::parent_class_init::<T>(class);
assert!(
crate::rt::is_initialized(),
"GTK has to be initialized first"
);
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();
let wrap: Borrowed<StyleContext> = from_glib_borrow(ptr);
imp.changed(wrap.unsafe_cast_ref())
}