eolian_mono: reduce duplicated code in OnXXXEvent

Summary:
`CallNativeEventCallback` is used to reduce duplicated code.

E.g.

Before
```
protected virtual void OnFullscreenChangedEvent(Efl.Ui.WinFullscreenChangedEventArgs e)
{
    var key = "_EFL_UI_WIN_EVENT_FULLSCREEN_CHANGED";
    IntPtr desc = Efl.EventDescription.GetNative(efl.Libs.Elementary, key);
    if (desc == IntPtr.Zero)
    {
        Eina.Log.Error($"Failed to get native event {key}");
        return;
    }

    IntPtr info = Eina.PrimitiveConversion.ManagedToPointerAlloc(e.arg ? (byte) 1 : (byte) 0);
    try
    {
        Efl.Eo.Globals.efl_event_callback_call(this.NativeHandle, desc, info);
    }
    finally
    {
        Marshal.FreeHGlobal(info);
    }
}
```

After
```
protected virtual void OnFullscreenChangedEvent(Efl.Ui.WinFullscreenChangedEventArgs e)
{
    IntPtr info = Eina.PrimitiveConversion.ManagedToPointerAlloc(e.arg ? (byte) 1 : (byte) 0);
    CallNativeEventCallback("elementary", "_EFL_UI_WIN_EVENT_FULLSCREEN_CHANGED", info, (p) => Marshal.FreeHGlobal(p));
}
```

Test Plan: meson setup -Dbindings=mono,cxx -Dmono-beta=true

Reviewers: lauromoura

Reviewed By: lauromoura

Subscribers: cedric, #reviewers, #committers

Tags: #efl

Differential Revision: https://phab.enlightenment.org/D10661

src/bin/eolian_mono/eolian/mono/events.hh

@@ -141,8 +141,8 @@ struct pack_event_info_and_call_visitor
    mutable OutputIterator sink;
    Context const* context;
    attributes::type_def const& type;
-
-   static auto constexpr native_call = "Efl.Eo.Globals.CallEventCallback(this.NativeHandle, desc, info);\n";
+   std::string library_name;
+   std::string evt_c_name;
 
    typedef pack_event_info_and_call_visitor<OutputIterator, Context> visitor_type;
    typedef bool result_type;
@@ -157,15 +157,7 @@ struct pack_event_info_and_call_visitor
         {
            return as_generator(
                 indent << "IntPtr info = Marshal.AllocHGlobal(Marshal.SizeOf(e.arg));\n"
-                << indent << "try\n"
-                << indent << "{\n"
-                << indent << scope_tab << "Marshal.StructureToPtr(e.arg, info, false);\n"
-                << indent << scope_tab << this->native_call
-                << indent << "}\n"
-                << indent << "finally\n"
-                << indent << "{\n"
-                << indent << scope_tab << "Marshal.FreeHGlobal(info);\n"
-                << indent << "}\n"
+                << indent << "CallNativeEventCallback(" + library_name + ", \"_" + evt_c_name + "\", info, " << "(p) => Marshal.FreeHGlobal(p));\n"
               ).generate(sink, attributes::unused, *context);
         }
 
@@ -192,14 +184,8 @@ struct pack_event_info_and_call_visitor
         {
            return as_generator(
              indent << "IntPtr info = Eina.StringConversion.ManagedStringToNativeUtf8Alloc(" << conversion << ");\n"
-             << indent << "try\n"
-             << indent << "{\n"
-             << indent << scope_tab << this->native_call
-             << indent << "}\n"
-             << indent << "finally\n"
-             << indent << "{\n"
-             << indent << scope_tab << "Eina.MemoryNative.Free(info);\n"
-             << indent << "}\n").generate(sink, attributes::unused, *context);
+             << indent << "CallNativeEventCallback(" + library_name + ", \"_" + evt_c_name + "\", info, " << "(p) => Eina.MemoryNative.Free(p));\n"
+             ).generate(sink, attributes::unused, *context);
         };
 
       if (eina::optional<bool> b = call_match(str_table, filter_func, str_accept_func))
@@ -216,14 +202,8 @@ struct pack_event_info_and_call_visitor
         {
            return as_generator(
              indent << "IntPtr info = Eina.PrimitiveConversion.ManagedToPointerAlloc(" << conversion << ");\n"
-             << indent << "try\n"
-             << indent << "{\n"
-             << indent << scope_tab << this->native_call
-             << indent << "}\n"
-             << indent << "finally\n"
-             << indent << "{\n"
-             << indent << scope_tab << "Marshal.FreeHGlobal(info);\n"
-             << indent << "}\n").generate(sink, attributes::unused, *context);
+             << indent << "CallNativeEventCallback(" + library_name + ", \"_" + evt_c_name + "\", info, " << "(p) => Marshal.FreeHGlobal(p));\n"
+             ).generate(sink, attributes::unused, *context);
         };
 
       if (eina::optional<bool> b = call_match(value_table, filter_func, value_accept_func))
@@ -235,13 +215,15 @@ struct pack_event_info_and_call_visitor
    {
       auto const& indent = current_indentation(*context);
       return as_generator(indent << "IntPtr info = e.arg.NativeHandle;\n"
-                          << indent << this->native_call).generate(sink, attributes::unused, *context);
+                          << "CallNativeEventCallback(" << library_name << ", \"_" << evt_c_name << "\", IntPtr.Zero, null);\n"
+                          ).generate(sink, attributes::unused, *context);
    }
    bool operator()(attributes::complex_type_def const&) const
    {
       auto const& indent = current_indentation(*context);
       return as_generator(indent << "IntPtr info = e.arg.Handle;\n"
-                          << indent << this->native_call).generate(sink, attributes::unused, *context);
+                          << "CallNativeEventCallback(" << library_name << ", \"_" << evt_c_name << "\", IntPtr.Zero, null);\n"
+                          ).generate(sink, attributes::unused, *context);
    }
 };
 
@@ -367,6 +349,7 @@ struct event_definition_generator
       if (blacklist::is_event_blacklisted(evt, context))
         return true;
 
+      auto library_name = context_find_tag<library_context>(context).actual_library_name(klass.filename);
       std::string managed_evt_name = name_helpers::managed_event_name(evt.name);
       auto const& indent = current_indentation(context);
 
@@ -396,7 +379,7 @@ struct event_definition_generator
       if (!etype.is_engaged())
         {
            auto event_call_site_sink = std::back_inserter(event_native_call);
-           if (!as_generator(indent.inc().inc() << "Efl.Eo.Globals.CallEventCallback(this.NativeHandle, desc, IntPtr.Zero);\n")
+           if (!as_generator(indent.inc().inc() << "CallNativeEventCallback(" << library_name << ", \"_" << utils::to_uppercase(evt.c_name) << "\", IntPtr.Zero, null);\n")
                  .generate(event_call_site_sink, attributes::unused, context))
              return false;
         }
@@ -417,7 +400,7 @@ struct event_definition_generator
            if (!(*etype).original_type.visit(unpack_event_args_visitor<decltype(arg_initializer_sink), decltype(sub_context)>{arg_initializer_sink, &sub_context, *etype}))
              return false;
 
-           if (!(*etype).original_type.visit(pack_event_info_and_call_visitor<decltype(event_call_site_sink), decltype(sub_context)>{event_call_site_sink, &sub_context, *etype}))
+           if (!(*etype).original_type.visit(pack_event_info_and_call_visitor<decltype(event_call_site_sink), decltype(sub_context)>{event_call_site_sink, &sub_context, *etype, library_name, utils::to_uppercase(evt.c_name)}))
              return false;
 
            arg_initializer += " }";
@@ -522,13 +505,6 @@ struct event_definition_generator
       if (!as_generator(
             scope_tab << (is_concrete ? "public" : "protected virtual") << " void On" << event_name << "(" << (!evt.type.is_engaged() ? "" : event_args_type + " e") << ")\n"
             << scope_tab << "{\n"
-            << scope_tab << scope_tab << "var key = \"_" << upper_c_name << "\";\n"
-            << scope_tab << scope_tab << "IntPtr desc = Efl.EventDescription.GetNative(" << library_name << ", key);\n"
-            << scope_tab << scope_tab << "if (desc == IntPtr.Zero)\n"
-            << scope_tab << scope_tab << "{\n"
-            << scope_tab << scope_tab << scope_tab << "Eina.Log.Error($\"Failed to get native event {key}\");\n"
-            << scope_tab << scope_tab << scope_tab << "return;\n"
-            << scope_tab << scope_tab << "}\n\n"
             << event_native_call
             << scope_tab << "}\n\n"
           ).generate(sink, nullptr, context))

src/bindings/mono/eo_mono/EoWrapper.cs

@@ -325,6 +325,7 @@ public abstract class EoWrapper : IWrapper, IDisposable
             }
         }
     }
+
     internal Efl.EventCb GetInternalEventCallback<T>(EventHandler<T> handler, Func<IntPtr, T> createArgsInstance) where T:EventArgs
     {
         return (IntPtr data, ref Efl.Event.NativeStruct evt) =>
@@ -344,6 +345,7 @@ public abstract class EoWrapper : IWrapper, IDisposable
            }
         };
     }
+
     internal Efl.EventCb GetInternalEventCallback(EventHandler handler)
     {
         return (IntPtr data, ref Efl.Event.NativeStruct evt) =>
@@ -364,6 +366,23 @@ public abstract class EoWrapper : IWrapper, IDisposable
         };
     }
 
+    internal void CallNativeEventCallback(string lib, string key, IntPtr eventInfo, Action<IntPtr> freeAction)
+    {
+        try
+        {
+            IntPtr desc = Efl.EventDescription.GetNative(lib, key);
+            if (desc == IntPtr.Zero)
+                throw new ArgumentException($"Failed to get native event {key}", "key");
+
+            Efl.Eo.Globals.CallEventCallback(NativeHandle, desc, eventInfo);
+        }
+        finally
+        {
+            if (freeAction != null)
+               freeAction(eventInfo);
+        }
+    }
+
     private static void OwnershipUniqueCallback(IntPtr data, ref Efl.Event.NativeStruct evt)
     {
         var ws = Efl.Eo.Globals.WrapperSupervisorPtrToManaged(data);