Port GhostPad subclassing

Gir_Gst.toml

@@ -735,6 +735,7 @@ trait = false
 
 [[object]]
 name = "Gst.GhostPad"
+subclassing = true
 status = "generate"
     [[object.function]]
     name = "set_target"

gstreamer/src/auto/ghost_pad.rs

@@ -2,6 +2,7 @@
 // from gir-files (https://github.com/gtk-rs/gir-files)
 // DO NOT EDIT
 
+use GhostPadClass;
 use Object;
 use Pad;
 use PadDirection;
@@ -18,7 +19,7 @@ use std::mem;
 use std::ptr;
 
 glib_wrapper! {
-    pub struct GhostPad(Object<ffi::GstGhostPad, ffi::GstGhostPadClass>): ProxyPad, Pad, Object;
+    pub struct GhostPad(Object<ffi::GstGhostPad, ffi::GstGhostPadClass, GhostPadClass>): ProxyPad, Pad, Object;
 
     match fn {
         get_type => || ffi::gst_ghost_pad_get_type(),

gstreamer/src/ghost_pad.rs

@@ -8,7 +8,7 @@
 
 use ffi;
 use glib::object::Downcast;
-use glib::object::IsA;
+use glib::object::{IsA, IsClassFor};
 use glib::translate::*;
 use GhostPad;
 use Object;
@@ -16,6 +16,8 @@ use Pad;
 use PadMode;
 use PadTemplate;
 
+use std::ops;
+
 impl GhostPad {
     pub fn new<'a, P: Into<Option<&'a str>>, Q: IsA<Pad>>(name: P, target: &Q) -> Option<GhostPad> {
         skip_assert_initialized!();
@@ -93,3 +95,27 @@ impl GhostPad {
         }
     }
 }
+
+#[repr(C)]
+pub struct GhostPadClass(ffi::GstGhostPadClass);
+
+unsafe impl IsClassFor for GhostPadClass {
+    type Instance = GhostPad;
+}
+
+unsafe impl Send for GhostPadClass {}
+unsafe impl Sync for GhostPadClass {}
+
+impl ops::Deref for GhostPadClass {
+    type Target = ::PadClass;
+
+    fn deref(&self) -> &Self::Target {
+        self.upcast_ref()
+    }
+}
+
+impl ops::DerefMut for GhostPadClass {
+    fn deref_mut(&mut self) -> &mut Self::Target {
+        self.upcast_ref_mut()
+    }
+}

gstreamer/src/lib.rs

@@ -180,6 +180,7 @@ mod device_monitor;
 mod device_provider;
 mod enums;
 mod ghost_pad;
+pub use ghost_pad::GhostPadClass;
 mod gobject;
 mod iterator;
 mod object;

gstreamer/src/subclass/ghost_pad.rs

@@ -0,0 +1,26 @@
+// Copyright (C) 2018 Sebastian Dröge <sebastian@centricular.com>
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+use ffi;
+
+use super::prelude::*;
+use glib::subclass::prelude::*;
+
+use GhostPadClass;
+
+pub trait GhostPadImpl: PadImpl + Send + Sync + 'static {}
+
+unsafe impl<T: ObjectSubclass + GhostPadImpl> IsSubclassable<T> for GhostPadClass {
+    fn override_vfuncs(&mut self) {
+        <::PadClass as IsSubclassable<T>>::override_vfuncs(self);
+        unsafe {
+            let _klass = &mut *(self as *const Self as *mut ffi::GstGhostPadClass);
+            // Nothing to do here
+        }
+    }
+}

gstreamer/src/subclass/mod.rs

@@ -16,6 +16,7 @@ pub mod plugin;
 pub mod bin;
 pub mod child_proxy;
 pub mod element;
+pub mod ghost_pad;
 pub mod pad;
 pub mod pipeline;
 pub mod uri_handler;
@@ -24,6 +25,7 @@ pub mod prelude {
     pub use super::bin::BinImpl;
     pub use super::child_proxy::ChildProxyImpl;
     pub use super::element::{ElementClassSubclassExt, ElementImpl, ElementImplExt};
+    pub use super::ghost_pad::GhostPadImpl;
     pub use super::pad::PadImpl;
     pub use super::pipeline::PipelineImpl;
     pub use super::uri_handler::URIHandlerImpl;