gtk4/
drawing_area.rs

1// Take a look at the license at the top of the repository in the LICENSE file.
2
3use std::{cell::RefCell, ptr};
4
5use glib::translate::*;
6
7use crate::{ffi, prelude::*, DrawingArea};
8
9// rustdoc-stripper-ignore-next
10/// Trait containing manually implemented methods of
11/// [`DrawingArea`](crate::DrawingArea).
12pub trait DrawingAreaExtManual: IsA<DrawingArea> + 'static {
13    #[doc(alias = "gtk_drawing_area_set_draw_func")]
14    #[doc(alias = "set_draw_func")]
15    fn unset_draw_func(&self) {
16        unsafe {
17            ffi::gtk_drawing_area_set_draw_func(
18                self.as_ref().to_glib_none().0,
19                None,
20                ptr::null_mut(),
21                None,
22            )
23        }
24    }
25
26    #[doc(alias = "gtk_drawing_area_set_draw_func")]
27    fn set_draw_func<P: FnMut(&DrawingArea, &cairo::Context, i32, i32) + 'static>(
28        &self,
29        draw_func: P,
30    ) {
31        unsafe extern "C" fn draw_func_func<
32            P: FnMut(&DrawingArea, &cairo::Context, i32, i32) + 'static,
33        >(
34            drawing_area: *mut ffi::GtkDrawingArea,
35            cr: *mut cairo::ffi::cairo_t,
36            width: libc::c_int,
37            height: libc::c_int,
38            user_data: glib::ffi::gpointer,
39        ) {
40            let drawing_area = from_glib_borrow(drawing_area);
41            let cr = from_glib_borrow(cr);
42            let callback: &RefCell<P> = &*(user_data as *mut _);
43            (callback.borrow_mut())(&drawing_area, &cr, width, height);
44        }
45
46        unsafe extern "C" fn destroy_func<
47            P: FnMut(&DrawingArea, &cairo::Context, i32, i32) + 'static,
48        >(
49            data: glib::ffi::gpointer,
50        ) {
51            let _callback: Box<RefCell<P>> = Box::from_raw(data as *mut _);
52        }
53
54        let callback: Box<RefCell<P>> = Box::new(RefCell::new(draw_func));
55        unsafe {
56            ffi::gtk_drawing_area_set_draw_func(
57                self.as_ref().to_glib_none().0,
58                Some(draw_func_func::<P> as _),
59                Box::into_raw(callback) as *mut _,
60                Some(destroy_func::<P> as _),
61            );
62        }
63    }
64}
65impl<O: IsA<DrawingArea>> DrawingAreaExtManual for O {}
gtk4/drawing_area.rs

gtk4/
drawing_area.rs
