gtk4/subclass/
gl_area.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 [`GLArea`].
5
6use gdk::GLContext;
7use glib::translate::*;
8
9use crate::{ffi, prelude::*, subclass::prelude::*, GLArea};
10
11#[allow(clippy::upper_case_acronyms)]
12pub trait GLAreaImpl: WidgetImpl + ObjectSubclass<Type: IsA<GLArea>> {
13    fn create_context(&self) -> Option<GLContext> {
14        self.parent_create_context()
15    }
16
17    fn render(&self, context: &GLContext) -> glib::Propagation {
18        self.parent_render(context)
19    }
20
21    fn resize(&self, width: i32, height: i32) {
22        self.parent_resize(width, height)
23    }
24}
25
26#[allow(clippy::upper_case_acronyms)]
27pub trait GLAreaImplExt: GLAreaImpl {
28    fn parent_create_context(&self) -> Option<GLContext> {
29        unsafe {
30            let data = Self::type_data();
31            let parent_class = data.as_ref().parent_class() as *mut ffi::GtkGLAreaClass;
32            if let Some(f) = (*parent_class).create_context {
33                return from_glib_none(f(self.obj().unsafe_cast_ref::<GLArea>().to_glib_none().0));
34            };
35            None
36        }
37    }
38
39    fn parent_render(&self, context: &GLContext) -> glib::Propagation {
40        unsafe {
41            let data = Self::type_data();
42            let parent_class = data.as_ref().parent_class() as *mut ffi::GtkGLAreaClass;
43            let f = (*parent_class)
44                .render
45                .expect("No parent class impl for \"render\"");
46            from_glib(f(
47                self.obj().unsafe_cast_ref::<GLArea>().to_glib_none().0,
48                context.to_glib_none().0,
49            ))
50        }
51    }
52
53    fn parent_resize(&self, width: i32, height: i32) {
54        unsafe {
55            let data = Self::type_data();
56            let parent_class = data.as_ref().parent_class() as *mut ffi::GtkGLAreaClass;
57            if let Some(f) = (*parent_class).resize {
58                f(
59                    self.obj().unsafe_cast_ref::<GLArea>().to_glib_none().0,
60                    width,
61                    height,
62                )
63            }
64        }
65    }
66}
67
68impl<T: GLAreaImpl> GLAreaImplExt for T {}
69
70unsafe impl<T: GLAreaImpl> IsSubclassable<T> for GLArea {
71    fn class_init(class: &mut glib::Class<Self>) {
72        Self::parent_class_init::<T>(class);
73
74        let klass = class.as_mut();
75        klass.create_context = Some(gl_area_create_context::<T>);
76        klass.render = Some(gl_area_render::<T>);
77        klass.resize = Some(gl_area_resize::<T>);
78    }
79}
80
81unsafe extern "C" fn gl_area_create_context<T: GLAreaImpl>(
82    ptr: *mut ffi::GtkGLArea,
83) -> *mut gdk::ffi::GdkGLContext {
84    let instance = &*(ptr as *mut T::Instance);
85    let imp = instance.imp();
86
87    imp.create_context().into_glib_ptr()
88}
89
90unsafe extern "C" fn gl_area_render<T: GLAreaImpl>(
91    ptr: *mut ffi::GtkGLArea,
92    context: *mut gdk::ffi::GdkGLContext,
93) -> glib::ffi::gboolean {
94    let instance = &*(ptr as *mut T::Instance);
95    let imp = instance.imp();
96
97    imp.render(&from_glib_borrow(context)).into_glib()
98}
99
100unsafe extern "C" fn gl_area_resize<T: GLAreaImpl>(
101    ptr: *mut ffi::GtkGLArea,
102    width: i32,
103    height: i32,
104) {
105    let instance = &*(ptr as *mut T::Instance);
106    let imp = instance.imp();
107
108    imp.resize(width, height)
109}
gtk4/subclass/gl_area.rs

gtk4/subclass/
gl_area.rs
