gtk4/subclass/
adjustment.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 [`Adjustment`](crate::Adjustment).
5
6use glib::translate::*;
7
8use crate::{ffi, prelude::*, subclass::prelude::*, Adjustment};
9
10pub trait AdjustmentImpl: AdjustmentImplExt + ObjectImpl {
11    fn changed(&self) {
12        self.parent_changed()
13    }
14
15    fn value_changed(&self) {
16        self.parent_value_changed()
17    }
18}
19
20mod sealed {
21    pub trait Sealed {}
22    impl<T: super::AdjustmentImplExt> Sealed for T {}
23}
24
25pub trait AdjustmentImplExt: 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::GtkAdjustmentClass;
30            if let Some(f) = (*parent_class).changed {
31                f(self.obj().unsafe_cast_ref::<Adjustment>().to_glib_none().0)
32            }
33        }
34    }
35
36    fn parent_value_changed(&self) {
37        unsafe {
38            let data = Self::type_data();
39            let parent_class = data.as_ref().parent_class() as *mut ffi::GtkAdjustmentClass;
40            if let Some(f) = (*parent_class).value_changed {
41                f(self.obj().unsafe_cast_ref::<Adjustment>().to_glib_none().0)
42            }
43        }
44    }
45}
46
47impl<T: AdjustmentImpl> AdjustmentImplExt for T {}
48
49unsafe impl<T: AdjustmentImpl> IsSubclassable<T> for Adjustment {
50    fn class_init(class: &mut glib::Class<Self>) {
51        Self::parent_class_init::<T>(class);
52
53        assert_initialized_main_thread!();
54
55        let klass = class.as_mut();
56        klass.changed = Some(adjustment_changed::<T>);
57        klass.value_changed = Some(adjustment_value_changed::<T>);
58    }
59}
60
61unsafe extern "C" fn adjustment_changed<T: AdjustmentImpl>(ptr: *mut ffi::GtkAdjustment) {
62    let instance = &*(ptr as *mut T::Instance);
63    let imp = instance.imp();
64
65    imp.changed()
66}
67
68unsafe extern "C" fn adjustment_value_changed<T: AdjustmentImpl>(ptr: *mut ffi::GtkAdjustment) {
69    let instance = &*(ptr as *mut T::Instance);
70    let imp = instance.imp();
71
72    imp.value_changed()
73}