gtk4/subclass/
gl_area.rs
1use gdk::GLContext;
7use glib::translate::*;
8
9use crate::{ffi, prelude::*, subclass::prelude::*, GLArea};
10
11#[allow(clippy::upper_case_acronyms)]
12pub trait GLAreaImpl: GLAreaImplExt + WidgetImpl {
13 fn create_context(&self) -> Option<GLContext> {
15 self.parent_create_context()
16 }
17
18 fn render(&self, context: &GLContext) -> glib::Propagation {
20 self.parent_render(context)
21 }
22
23 fn resize(&self, width: i32, height: i32) {
25 self.parent_resize(width, height)
26 }
27}
28
29mod sealed {
30 pub trait Sealed {}
31 impl<T: super::GLAreaImplExt> Sealed for T {}
32}
33
34#[allow(clippy::upper_case_acronyms)]
35pub trait GLAreaImplExt: sealed::Sealed + ObjectSubclass {
36 fn parent_create_context(&self) -> Option<GLContext> {
37 unsafe {
38 let data = Self::type_data();
39 let parent_class = data.as_ref().parent_class() as *mut ffi::GtkGLAreaClass;
40 if let Some(f) = (*parent_class).create_context {
41 return Some(from_glib_none(f(self
42 .obj()
43 .unsafe_cast_ref::<GLArea>()
44 .to_glib_none()
45 .0)));
46 };
47 None
48 }
49 }
50
51 fn parent_render(&self, context: &GLContext) -> glib::Propagation {
52 unsafe {
53 let data = Self::type_data();
54 let parent_class = data.as_ref().parent_class() as *mut ffi::GtkGLAreaClass;
55 let f = (*parent_class)
56 .render
57 .expect("No parent class impl for \"render\"");
58 from_glib(f(
59 self.obj().unsafe_cast_ref::<GLArea>().to_glib_none().0,
60 context.to_glib_none().0,
61 ))
62 }
63 }
64
65 fn parent_resize(&self, width: i32, height: i32) {
66 unsafe {
67 let data = Self::type_data();
68 let parent_class = data.as_ref().parent_class() as *mut ffi::GtkGLAreaClass;
69 if let Some(f) = (*parent_class).resize {
70 f(
71 self.obj().unsafe_cast_ref::<GLArea>().to_glib_none().0,
72 width,
73 height,
74 )
75 }
76 }
77 }
78}
79
80impl<T: GLAreaImpl> GLAreaImplExt for T {}
81
82unsafe impl<T: GLAreaImpl> IsSubclassable<T> for GLArea {
83 fn class_init(class: &mut glib::Class<Self>) {
84 Self::parent_class_init::<T>(class);
85
86 let klass = class.as_mut();
87 klass.create_context = Some(gl_area_create_context::<T>);
88 klass.render = Some(gl_area_render::<T>);
89 klass.resize = Some(gl_area_resize::<T>);
90 }
91}
92
93unsafe extern "C" fn gl_area_create_context<T: GLAreaImpl>(
94 ptr: *mut ffi::GtkGLArea,
95) -> *mut gdk::ffi::GdkGLContext {
96 let instance = &*(ptr as *mut T::Instance);
97 let imp = instance.imp();
98
99 imp.create_context().into_glib_ptr()
100}
101
102unsafe extern "C" fn gl_area_render<T: GLAreaImpl>(
103 ptr: *mut ffi::GtkGLArea,
104 context: *mut gdk::ffi::GdkGLContext,
105) -> glib::ffi::gboolean {
106 let instance = &*(ptr as *mut T::Instance);
107 let imp = instance.imp();
108
109 imp.render(&from_glib_borrow(context)).into_glib()
110}
111
112unsafe extern "C" fn gl_area_resize<T: GLAreaImpl>(
113 ptr: *mut ffi::GtkGLArea,
114 width: i32,
115 height: i32,
116) {
117 let instance = &*(ptr as *mut T::Instance);
118 let imp = instance.imp();
119
120 imp.resize(width, height)
121}