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use crate::subclass::prelude::*;
use crate::{Border, Scrollable};
use glib::translate::*;
use glib::Cast;
pub trait ScrollableImpl: ObjectImpl {
#[doc(alias = "get_border")]
fn border(&self, scrollable: &Self::Type) -> Option<Border> {
self.parent_border(scrollable)
}
}
pub trait ScrollableImplExt: ObjectSubclass {
fn parent_border(&self, scrollable: &Self::Type) -> Option<Border>;
}
impl<T: ScrollableImpl> ScrollableImplExt for T {
fn parent_border(&self, scrollable: &Self::Type) -> Option<Border> {
unsafe {
let type_data = Self::type_data();
let parent_iface = type_data.as_ref().parent_interface::<Scrollable>()
as *const ffi::GtkScrollableInterface;
if let Some(func) = (*parent_iface).get_border {
let border = std::ptr::null_mut();
if from_glib(func(
scrollable.unsafe_cast_ref::<Scrollable>().to_glib_none().0,
border,
)) {
return Some(from_glib_none(border));
}
}
None
}
}
}
unsafe impl<T: ScrollableImpl> IsImplementable<T> for Scrollable {
fn interface_init(iface: &mut glib::Interface<Self>) {
let iface = iface.as_mut();
assert!(
crate::rt::is_initialized(),
"GTK has to be initialized first"
);
iface.get_border = Some(scrollable_get_border::<T>);
}
}
unsafe extern "C" fn scrollable_get_border<T: ScrollableImpl>(
scrollable: *mut ffi::GtkScrollable,
borderptr: *mut ffi::GtkBorder,
) -> glib::ffi::gboolean {
let instance = &*(scrollable as *mut T::Instance);
let imp = instance.imp();
if let Some(border) =
imp.border(from_glib_borrow::<_, Scrollable>(scrollable).unsafe_cast_ref())
{
*borderptr = *border.to_glib_full();
true.into_glib()
} else {
*borderptr = ffi::GtkBorder {
top: 0,
right: 0,
left: 0,
bottom: 0,
};
false.into_glib()
}
}