Merge pull request #62 from gtk-rs/bilelmoussaoui/subclassing-4

Subclassing round 4

gtk4/src/subclass/filter.rs

@@ -0,0 +1,78 @@
+use crate::{Filter, FilterMatch};
+use glib::subclass::object::ObjectImpl;
+use glib::subclass::prelude::*;
+use glib::translate::*;
+use glib::{Cast, Object};
+
+pub trait FilterImpl: FilterImplExt + ObjectImpl {
+    fn get_strictness(&self, filter: &Self::Type) -> FilterMatch {
+        self.parent_get_strictness(filter)
+    }
+    fn match_(&self, filter: &Self::Type, item: &Object) -> bool {
+        self.parent_match_(filter, item)
+    }
+}
+
+pub trait FilterImplExt: ObjectSubclass {
+    fn parent_get_strictness(&self, filter: &Self::Type) -> FilterMatch;
+    fn parent_match_(&self, filter: &Self::Type, item: &Object) -> bool;
+}
+
+impl<T: FilterImpl> FilterImplExt for T {
+    fn parent_get_strictness(&self, filter: &Self::Type) -> FilterMatch {
+        unsafe {
+            let data = T::type_data();
+            let parent_class = data.as_ref().get_parent_class() as *mut ffi::GtkFilterClass;
+            let f = (*parent_class)
+                .get_strictness
+                .expect("No parent class impl for \"get_strictness\"");
+            from_glib(f(filter.unsafe_cast_ref::<Filter>().to_glib_none().0))
+        }
+    }
+
+    fn parent_match_(&self, filter: &Self::Type, item: &Object) -> bool {
+        unsafe {
+            let data = T::type_data();
+            let parent_class = data.as_ref().get_parent_class() as *mut ffi::GtkFilterClass;
+            let f = (*parent_class)
+                .match_
+                .expect("No parent class impl for \"match\"");
+            from_glib(f(
+                filter.unsafe_cast_ref::<Filter>().to_glib_none().0,
+                item.to_glib_none().0,
+            ))
+        }
+    }
+}
+
+unsafe impl<T: FilterImpl> IsSubclassable<T> for Filter {
+    fn override_vfuncs(class: &mut glib::Class<Self>) {
+        <Object as IsSubclassable<T>>::override_vfuncs(class);
+
+        let klass = class.as_mut();
+        klass.match_ = Some(filter_match::<T>);
+        klass.get_strictness = Some(filter_get_strictness::<T>);
+    }
+}
+
+unsafe extern "C" fn filter_get_strictness<T: FilterImpl>(
+    ptr: *mut ffi::GtkFilter,
+) -> ffi::GtkFilterMatch {
+    let instance = &*(ptr as *mut T::Instance);
+    let imp = instance.get_impl();
+    let wrap: Borrowed<Filter> = from_glib_borrow(ptr);
+
+    imp.get_strictness(wrap.unsafe_cast_ref()).to_glib()
+}
+
+unsafe extern "C" fn filter_match<T: FilterImpl>(
+    ptr: *mut ffi::GtkFilter,
+    itemptr: *mut glib::gobject_ffi::GObject,
+) -> glib::ffi::gboolean {
+    let instance = &*(ptr as *mut T::Instance);
+    let imp = instance.get_impl();
+    let wrap: Borrowed<Filter> = from_glib_borrow(ptr);
+
+    imp.match_(wrap.unsafe_cast_ref(), &from_glib_borrow(itemptr))
+        .to_glib()
+}