gtk/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: ObjectImpl + 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            (*parent_iface).get_border.and_then(|func| {
25                let mut border = Border::uninitialized();
26                from_glib::<_, bool>(func(
27                    self.obj().unsafe_cast_ref::<Scrollable>().to_glib_none().0,
28                    border.to_glib_none_mut().0,
29                ))
30                .then_some(border)
31            })
32        }
33    }
34}
35
36impl<T: ScrollableImpl> ScrollableImplExt for T {}
37
38unsafe impl<T: ScrollableImpl> IsImplementable<T> for Scrollable {
39    fn interface_init(iface: &mut glib::Interface<Self>) {
40        let iface = iface.as_mut();
41
42        if !crate::rt::is_initialized() {
43            panic!("GTK has to be initialized first");
44        }
45
46        iface.get_border = Some(scrollable_get_border::<T>);
47    }
48}
49
50unsafe extern "C" fn scrollable_get_border<T: ScrollableImpl>(
51    scrollableptr: *mut ffi::GtkScrollable,
52    borderptr: *mut ffi::GtkBorder,
53) -> glib::ffi::gboolean {
54    unsafe {
55        let instance = &*(scrollableptr as *mut T::Instance);
56        let imp = instance.imp();
57
58        if let Some(border) = imp.border() {
59            if !borderptr.is_null() {
60                *borderptr = *border;
61            }
62            glib::ffi::GTRUE
63        } else {
64            glib::ffi::GFALSE
65        }
66    }
67}
gtk/subclass/scrollable.rs

gtk/subclass/
scrollable.rs
