gio: Make methods of *Impl traits take Self::Type

examples/src/bin/basic_subclass.rs

@@ -154,7 +154,7 @@ mod imp_app {
         // `gio::Application::activate` is what gets called when the
         // application is launched by the desktop environment and
         // aksed to present itself.
-        fn activate(&self, app: &gio::Application) {
+        fn activate(&self, app: &Self::Type) {
             let app = app.downcast_ref::<super::SimpleApplication>().unwrap();
             let priv_ = SimpleApplication::from_instance(app);
             let window = priv_
@@ -172,7 +172,7 @@ mod imp_app {
         //
         // Due to this, we create and initialize the `SimpleWindow` widget
         // here. Widgets can't be created before `startup` has been called.
-        fn startup(&self, app: &gio::Application) {
+        fn startup(&self, app: &Self::Type) {
             self.parent_startup(app);
 
             let app = app.downcast_ref::<super::SimpleApplication>().unwrap();

gio/src/read_input_stream.rs

@@ -49,7 +49,7 @@ mod imp {
     impl InputStreamImpl for ReadInputStream {
         fn read(
             &self,
-            _stream: &InputStream,
+            _stream: &Self::Type,
             buffer: &mut [u8],
             _cancellable: Option<&crate::Cancellable>,
         ) -> Result<usize, glib::Error> {
@@ -75,7 +75,7 @@ mod imp {
 
         fn close(
             &self,
-            _stream: &InputStream,
+            _stream: &Self::Type,
             _cancellable: Option<&crate::Cancellable>,
         ) -> Result<(), glib::Error> {
             let _ = self.read.borrow_mut().take();
@@ -84,7 +84,7 @@ mod imp {
     }
 
     impl SeekableImpl for ReadInputStream {
-        fn tell(&self, _seekable: &crate::Seekable) -> i64 {
+        fn tell(&self, _seekable: &Self::Type) -> i64 {
             // XXX: stream_position is not stable yet
             // let mut read = self.read.borrow_mut();
             // match *read {
@@ -96,7 +96,7 @@ mod imp {
             -1
         }
 
-        fn can_seek(&self, _seekable: &crate::Seekable) -> bool {
+        fn can_seek(&self, _seekable: &Self::Type) -> bool {
             let read = self.read.borrow();
             match *read {
                 Some(Reader::ReadSeek(_)) => true,
@@ -106,7 +106,7 @@ mod imp {
 
         fn seek(
             &self,
-            _seekable: &crate::Seekable,
+            _seekable: &Self::Type,
             offset: i64,
             type_: glib::SeekType,
             _cancellable: Option<&crate::Cancellable>,
@@ -146,13 +146,13 @@ mod imp {
             }
         }
 
-        fn can_truncate(&self, _seekable: &crate::Seekable) -> bool {
+        fn can_truncate(&self, _seekable: &Self::Type) -> bool {
             false
         }
 
         fn truncate(
             &self,
-            _seekable: &crate::Seekable,
+            _seekable: &Self::Type,
             _offset: i64,
             _cancellable: Option<&crate::Cancellable>,
         ) -> Result<(), glib::Error> {