[glibmm] Gio::SocketClient::signal_event(): Fix wrapping of 'connection' param

[Kjell Ahlstedt <kjellahl src gnome org>]

commit 477fcd63ab7a836be8916e44f7d3145f650da55c
Author: Kjell Ahlstedt <kjellahlstedt gmail com>
Date:   Fri Jul 31 15:20:49 2020 +0200

    Gio::SocketClient::signal_event(): Fix wrapping of 'connection' param
    
    The GIOStream* parameter in the 'event' signal can point to either a
    GSocketConnection or to a subclass of GTlsConnection that implements
    the GTlsClientConnection interface. If it implements the
    GTlsClientConnection interface, wrap it in a Gio::TlsClientConnectionImpl.
    Then a signal handler can do:
      auto tls_client_connection =
        std::dynamic_pointer_cast<Gio::TlsClientConnection>(connection);
    
    Fixes #73

 gio/src/socketclient.ccg | 19 +++++++++++++++++++
 gio/src/socketclient.hg  |  5 +++--
 2 files changed, 22 insertions(+), 2 deletions(-)
---
diff --git a/gio/src/socketclient.ccg b/gio/src/socketclient.ccg
index 8339f12d..52658d62 100644
--- a/gio/src/socketclient.ccg
+++ b/gio/src/socketclient.ccg
@@ -15,9 +15,28 @@
  */
 
 #include <gio/gio.h>
+#include <giomm/tlsclientconnectionimpl.h>
 #include <giomm/asyncresult.h>
 #include "slot_async.h"
 
+namespace
+{
+// Wrap the GIOStream* connection in the 'event' signal.
+// The GIOStream pointer, if not a nullptr, can point to either a GSocketConnection
+// or to a subclass of GTlsConnection that implements the GTlsClientConnection interface.
+Glib::RefPtr<Gio::IOStream> SocketClient_signal_event_wrap_connection(GIOStream* object, bool take_copy)
+{
+  if (!Glib::ObjectBase::_get_current_wrapper((GObject*)object) &&
+      G_IS_TLS_CLIENT_CONNECTION(object))
+    // An instance of a class that implements GTlsClientConnection.
+    // It doesn't have a wrapper. Wrap it in a Gio::TlsClientConnectionImpl.
+    return Glib::wrap_tls_client_connection_impl(G_TLS_CONNECTION(object), take_copy);
+
+  return Glib::wrap(object, take_copy);
+}
+
+} // anonymous namespace
+
 namespace Gio
 {
 
diff --git a/gio/src/socketclient.hg b/gio/src/socketclient.hg
index b7ae3e32..b0a5d898 100644
--- a/gio/src/socketclient.hg
+++ b/gio/src/socketclient.hg
@@ -167,8 +167,9 @@ public:
   _WRAP_PROPERTY("proxy-resolver", Glib::RefPtr<ProxyResolver>)
 
 #m4 _CONVERSION(`GSocketConnectable*',`const Glib::RefPtr<SocketConnectable>&',`Glib::wrap($3, true)')
-#m4 _CONVERSION(`GIOStream*',`const Glib::RefPtr<IOStream>&',`Glib::wrap($3, true)')
-  _WRAP_SIGNAL(void event(SocketClientEvent event, const Glib::RefPtr<SocketConnectable>& connectable, const 
Glib::RefPtr<IOStream>& connection), event)
+#m4 _CONVERSION(`GIOStream*',`const Glib::RefPtr<IOStream>&',`SocketClient_signal_event_wrap_connection($3, 
true)')
+  _WRAP_SIGNAL(void event(SocketClientEvent event, const Glib::RefPtr<SocketConnectable>& connectable,
+    const Glib::RefPtr<IOStream>& connection), event)
 };
 
 } // namespace Gio