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gtk/subclass/
drawing_area.rs

1// Take a look at the license at the top of the repository in the LICENSE file.
2
3use glib::subclass::prelude::*;
4
5use super::widget::WidgetImpl;
6use crate::DrawingArea;
7
8pub trait DrawingAreaImpl: WidgetImpl {}
9
10unsafe impl<T: DrawingAreaImpl> IsSubclassable<T> for DrawingArea {
11    fn class_init(class: &mut ::glib::Class<Self>) {
12        Self::parent_class_init::<T>(class);
13
14        if !crate::rt::is_initialized() {
15            panic!("GTK has to be initialized first");
16        }
17    }
18}