gtk4/
drawing_area.rs
1use std::{cell::RefCell, ptr};
4
5use glib::translate::*;
6
7use crate::{ffi, prelude::*, DrawingArea};
8
9mod sealed {
10 pub trait Sealed {}
11 impl<T: super::IsA<super::DrawingArea>> Sealed for T {}
12}
13
14pub trait DrawingAreaExtManual: sealed::Sealed + IsA<DrawingArea> + 'static {
18 #[doc(alias = "gtk_drawing_area_set_draw_func")]
19 #[doc(alias = "set_draw_func")]
20 fn unset_draw_func(&self) {
21 unsafe {
22 ffi::gtk_drawing_area_set_draw_func(
23 self.as_ref().to_glib_none().0,
24 None,
25 ptr::null_mut(),
26 None,
27 )
28 }
29 }
30
31 #[doc(alias = "gtk_drawing_area_set_draw_func")]
49 fn set_draw_func<P: FnMut(&DrawingArea, &cairo::Context, i32, i32) + 'static>(
50 &self,
51 draw_func: P,
52 ) {
53 unsafe extern "C" fn draw_func_func<
54 P: FnMut(&DrawingArea, &cairo::Context, i32, i32) + 'static,
55 >(
56 drawing_area: *mut ffi::GtkDrawingArea,
57 cr: *mut cairo::ffi::cairo_t,
58 width: libc::c_int,
59 height: libc::c_int,
60 user_data: glib::ffi::gpointer,
61 ) {
62 let drawing_area = from_glib_borrow(drawing_area);
63 let cr = from_glib_borrow(cr);
64 let callback: &RefCell<P> = &*(user_data as *mut _);
65 (callback.borrow_mut())(&drawing_area, &cr, width, height);
66 }
67
68 unsafe extern "C" fn destroy_func<
69 P: FnMut(&DrawingArea, &cairo::Context, i32, i32) + 'static,
70 >(
71 data: glib::ffi::gpointer,
72 ) {
73 let _callback: Box<RefCell<P>> = Box::from_raw(data as *mut _);
74 }
75
76 let callback: Box<RefCell<P>> = Box::new(RefCell::new(draw_func));
77 unsafe {
78 ffi::gtk_drawing_area_set_draw_func(
79 self.as_ref().to_glib_none().0,
80 Some(draw_func_func::<P> as _),
81 Box::into_raw(callback) as *mut _,
82 Some(destroy_func::<P> as _),
83 );
84 }
85 }
86}
87impl<O: IsA<DrawingArea>> DrawingAreaExtManual for O {}