gtk4/subclass/
scrollable.rs

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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::{ffi, prelude::*, subclass::prelude::*, Border, Scrollable};
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    let instance = &*(scrollable as *mut T::Instance);
53    let imp = instance.imp();
54
55    if let Some(border) = imp.border() {
56        *borderptr = *IntoGlibPtr::<*mut _>::into_glib_ptr(border);
57        true.into_glib()
58    } else {
59        *borderptr = ffi::GtkBorder {
60            top: 0,
61            right: 0,
62            left: 0,
63            bottom: 0,
64        };
65        false.into_glib()
66    }
67}
gtk4/subclass/scrollable.rs

gtk4/subclass/
scrollable.rs
