gtk4/subclass/
scrollable.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 implementing the [`Scrollable`] interface.
5
6use glib::translate::*;
7
8use crate::{Border, Scrollable, ffi, prelude::*, subclass::prelude::*};
9
10pub trait ScrollableImpl: WidgetImpl + ObjectSubclass<Type: IsA<Scrollable>> {
11    #[doc(alias = "get_border")]
12    fn border(&self) -> Option<Border> {
13        self.parent_border()
14    }
15}
16
17pub trait ScrollableImplExt: ScrollableImpl {
18    fn parent_border(&self) -> Option<Border> {
19        unsafe {
20            let type_data = Self::type_data();
21            let parent_iface = type_data.as_ref().parent_interface::<Scrollable>()
22                as *const ffi::GtkScrollableInterface;
23
24            if let Some(func) = (*parent_iface).get_border {
25                let border = std::ptr::null_mut();
26                if from_glib(func(
27                    self.obj().unsafe_cast_ref::<Scrollable>().to_glib_none().0,
28                    border,
29                )) {
30                    return Some(from_glib_none(border));
31                }
32            }
33            None
34        }
35    }
36}
37
38impl<T: ScrollableImpl> ScrollableImplExt for T {}
39
40unsafe impl<T: ScrollableImpl> IsImplementable<T> for Scrollable {
41    fn interface_init(iface: &mut glib::Interface<Self>) {
42        let iface = iface.as_mut();
43
44        iface.get_border = Some(scrollable_get_border::<T>);
45    }
46}
47
48unsafe extern "C" fn scrollable_get_border<T: ScrollableImpl>(
49    scrollable: *mut ffi::GtkScrollable,
50    borderptr: *mut ffi::GtkBorder,
51) -> glib::ffi::gboolean {
52    unsafe {
53        let instance = &*(scrollable as *mut T::Instance);
54        let imp = instance.imp();
55
56        if let Some(border) = imp.border() {
57            *borderptr = *IntoGlibPtr::<*mut _>::into_glib_ptr(border);
58            true.into_glib()
59        } else {
60            *borderptr = ffi::GtkBorder {
61                top: 0,
62                right: 0,
63                left: 0,
64                bottom: 0,
65            };
66            false.into_glib()
67        }
68    }
69}
gtk4/subclass/scrollable.rs

gtk4/subclass/
scrollable.rs
