Port ChildProxy subclassing

gstreamer/src/subclass/child_proxy.rs

@@ -0,0 +1,159 @@
+// 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 glib_ffi;
+use gobject_ffi;
+
+use glib;
+use glib::subclass::prelude::*;
+use glib::translate::*;
+
+use libc;
+
+use std::ptr;
+
+use ChildProxy;
+
+pub trait ChildProxyImpl: super::element::ElementImpl + Send + Sync + 'static {
+    fn get_child_by_name(&self, object: &ChildProxy, name: &str) -> Option<glib::Object> {
+        unsafe {
+            let type_ = ffi::gst_child_proxy_get_type();
+            let iface = gobject_ffi::g_type_default_interface_ref(type_)
+                as *mut ffi::GstChildProxyInterface;
+            assert!(!iface.is_null());
+
+            let ret = ((*iface).get_child_by_name.as_ref().unwrap())(
+                object.to_glib_none().0,
+                name.to_glib_none().0,
+            );
+
+            gobject_ffi::g_type_default_interface_unref(iface as glib_ffi::gpointer);
+
+            from_glib_full(ret)
+        }
+    }
+
+    fn get_child_by_index(&self, object: &ChildProxy, index: u32) -> Option<glib::Object>;
+    fn get_children_count(&self, object: &ChildProxy) -> u32;
+
+    fn child_added(&self, object: &ChildProxy, child: &glib::Object, name: &str);
+    fn child_removed(&self, object: &ChildProxy, child: &glib::Object, name: &str);
+}
+
+unsafe extern "C" fn child_proxy_get_child_by_name<T: ObjectSubclass>(
+    child_proxy: *mut ffi::GstChildProxy,
+    name: *const libc::c_char,
+) -> *mut gobject_ffi::GObject
+where
+    T: ChildProxyImpl,
+{
+    glib_floating_reference_guard!(child_proxy);
+    let instance = &*(child_proxy as *mut T::Instance);
+    let imp = instance.get_impl();
+
+    imp.get_child_by_name(
+        &from_glib_borrow(child_proxy),
+        String::from_glib_none(name).as_str(),
+    )
+    .to_glib_full()
+}
+
+unsafe extern "C" fn child_proxy_get_child_by_index<T: ObjectSubclass>(
+    child_proxy: *mut ffi::GstChildProxy,
+    index: u32,
+) -> *mut gobject_ffi::GObject
+where
+    T: ChildProxyImpl,
+{
+    glib_floating_reference_guard!(child_proxy);
+    let instance = &*(child_proxy as *mut T::Instance);
+    let imp = instance.get_impl();
+
+    imp.get_child_by_index(&from_glib_borrow(child_proxy), index)
+        .to_glib_full()
+}
+
+unsafe extern "C" fn child_proxy_get_children_count<T: ObjectSubclass>(
+    child_proxy: *mut ffi::GstChildProxy,
+) -> u32
+where
+    T: ChildProxyImpl,
+{
+    glib_floating_reference_guard!(child_proxy);
+    let instance = &*(child_proxy as *mut T::Instance);
+    let imp = instance.get_impl();
+
+    imp.get_children_count(&from_glib_borrow(child_proxy))
+}
+
+unsafe extern "C" fn child_proxy_child_added<T: ObjectSubclass>(
+    child_proxy: *mut ffi::GstChildProxy,
+    child: *mut gobject_ffi::GObject,
+    name: *const libc::c_char,
+) where
+    T: ChildProxyImpl,
+{
+    glib_floating_reference_guard!(child_proxy);
+    let instance = &*(child_proxy as *mut T::Instance);
+    let imp = instance.get_impl();
+
+    imp.child_added(
+        &from_glib_borrow(child_proxy),
+        &from_glib_borrow(child),
+        String::from_glib_none(name).as_str(),
+    )
+}
+
+unsafe extern "C" fn child_proxy_child_removed<T: ObjectSubclass>(
+    child_proxy: *mut ffi::GstChildProxy,
+    child: *mut gobject_ffi::GObject,
+    name: *const libc::c_char,
+) where
+    T: ChildProxyImpl,
+{
+    glib_floating_reference_guard!(child_proxy);
+    let instance = &*(child_proxy as *mut T::Instance);
+    let imp = instance.get_impl();
+
+    imp.child_removed(
+        &from_glib_borrow(child_proxy),
+        &from_glib_borrow(child),
+        String::from_glib_none(name).as_str(),
+    )
+}
+
+unsafe extern "C" fn child_proxy_init<T: ObjectSubclass>(
+    iface: glib_ffi::gpointer,
+    _iface_data: glib_ffi::gpointer,
+) where
+    T: ChildProxyImpl,
+{
+    let child_proxy_iface = &mut *(iface as *mut ffi::GstChildProxyInterface);
+
+    child_proxy_iface.get_child_by_name = Some(child_proxy_get_child_by_name::<T>);
+    child_proxy_iface.get_child_by_index = Some(child_proxy_get_child_by_index::<T>);
+    child_proxy_iface.get_children_count = Some(child_proxy_get_children_count::<T>);
+    child_proxy_iface.child_added = Some(child_proxy_child_added::<T>);
+    child_proxy_iface.child_removed = Some(child_proxy_child_removed::<T>);
+}
+
+pub fn register<T: ObjectSubclass + ChildProxyImpl>(type_: glib::subclass::InitializingType<T>) {
+    unsafe {
+        let iface_info = gobject_ffi::GInterfaceInfo {
+            interface_init: Some(child_proxy_init::<T>),
+            interface_finalize: None,
+            interface_data: ptr::null_mut(),
+        };
+        gobject_ffi::g_type_add_interface_static(
+            type_.to_glib(),
+            ffi::gst_child_proxy_get_type(),
+            &iface_info,
+        );
+    }
+}

gstreamer/src/subclass/mod.rs

@@ -13,9 +13,12 @@ pub mod error;
 #[macro_use]
 pub mod plugin;
 
+pub mod child_proxy;
 pub mod element;
+pub mod uri_handler;
 
 pub mod prelude {
+    pub use super::child_proxy::ChildProxyImpl;
     pub use super::element::{ElementClassSubclassExt, ElementImpl, ElementImplExt};
     pub use super::uri_handler::URIHandlerImpl;
     pub use super::PanicPoison;

gstreamer/src/subclass/uri_handler.rs

@@ -109,9 +109,7 @@ unsafe extern "C" fn uri_handler_init<T: ObjectSubclass>(
     uri_handler_iface.set_uri = Some(uri_handler_set_uri::<T>);
 }
 
-pub fn register<T: ObjectSubclass + URIHandlerImpl>(
-    type_: &glib::subclass::InitializingType<T>,
-) {
+pub fn register<T: ObjectSubclass + URIHandlerImpl>(type_: &glib::subclass::InitializingType<T>) {
     unsafe {
         let iface_info = gobject_ffi::GInterfaceInfo {
             interface_init: Some(uri_handler_init::<T>),