gtk4/subclass/
scale.rs
1use glib::translate::*;
7
8use crate::{ffi, prelude::*, subclass::prelude::*, Scale};
9
10pub trait ScaleImpl: ScaleImplExt + RangeImpl {
11 #[doc(alias = "get_layout_offsets")]
29 fn layout_offsets(&self) -> (i32, i32) {
30 self.parent_layout_offsets()
31 }
32}
33
34mod sealed {
35 pub trait Sealed {}
36 impl<T: super::ScaleImplExt> Sealed for T {}
37}
38
39pub trait ScaleImplExt: sealed::Sealed + ObjectSubclass {
40 fn parent_layout_offsets(&self) -> (i32, i32) {
41 unsafe {
42 let data = Self::type_data();
43 let parent_class = data.as_ref().parent_class() as *mut ffi::GtkScaleClass;
44 let mut x = 0;
45 let mut y = 0;
46 if let Some(f) = (*parent_class).get_layout_offsets {
47 f(
48 self.obj().unsafe_cast_ref::<Scale>().to_glib_none().0,
49 &mut x,
50 &mut y,
51 );
52 }
53 (x, y)
54 }
55 }
56}
57
58impl<T: ScaleImpl> ScaleImplExt for T {}
59
60unsafe impl<T: ScaleImpl> IsSubclassable<T> for Scale {
61 fn class_init(class: &mut glib::Class<Self>) {
62 Self::parent_class_init::<T>(class);
63
64 let klass = class.as_mut();
65 klass.get_layout_offsets = Some(scale_get_layout_offsets::<T>);
66 }
67}
68
69unsafe extern "C" fn scale_get_layout_offsets<T: ScaleImpl>(
70 ptr: *mut ffi::GtkScale,
71 x_ptr: *mut libc::c_int,
72 y_ptr: *mut libc::c_int,
73) {
74 let instance = &*(ptr as *mut T::Instance);
75 let imp = instance.imp();
76
77 let (x, y) = imp.layout_offsets();
78 *x_ptr = x;
79 *y_ptr = y;
80}