gtk4/subclass/
frame.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 subclassing [`Frame`](crate::Frame).
5
6use glib::translate::*;
7
8use crate::{ffi, prelude::*, subclass::prelude::*, Allocation, Frame};
9
10#[cfg_attr(feature = "v4_10", deprecated = "Since 4.10")]
11#[allow(deprecated)]
12pub trait FrameImpl: FrameImplExt + WidgetImpl {
13    fn compute_child_allocation(&self) -> Allocation {
14        self.parent_compute_child_allocation()
15    }
16}
17
18#[cfg_attr(feature = "v4_10", deprecated = "Since 4.10")]
19#[allow(deprecated)]
20pub trait FrameImplExt: ObjectSubclass {
21    fn parent_compute_child_allocation(&self) -> Allocation {
22        unsafe {
23            let data = Self::type_data();
24            let parent_class = data.as_ref().parent_class() as *mut ffi::GtkFrameClass;
25            let f = (*parent_class)
26                .compute_child_allocation
27                .expect("No parent class impl for \"compute_child_allocation\"");
28            let mut allocation = Allocation::uninitialized();
29            f(
30                self.obj().unsafe_cast_ref::<Frame>().to_glib_none().0,
31                allocation.to_glib_none_mut().0,
32            );
33            allocation
34        }
35    }
36}
37
38impl<T: FrameImpl> FrameImplExt for T {}
39
40unsafe impl<T: FrameImpl> IsSubclassable<T> for Frame {
41    fn class_init(class: &mut glib::Class<Self>) {
42        Self::parent_class_init::<T>(class);
43
44        let klass = class.as_mut();
45        klass.compute_child_allocation = Some(frame_compute_child_allocation::<T>);
46    }
47}
48
49unsafe extern "C" fn frame_compute_child_allocation<T: FrameImpl>(
50    ptr: *mut ffi::GtkFrame,
51    allocationptr: *mut ffi::GtkAllocation,
52) {
53    let instance = &*(ptr as *mut T::Instance);
54    let imp = instance.imp();
55
56    let allocation = imp.compute_child_allocation();
57    *allocationptr = *allocation.to_glib_none().0;
58}