[vala/0.52] gtkmodule: Handle nested closure elements and bind them accordingly

[Rico Tzschichholz <ricotz src gnome org>]

commit c9fce827214680543c3d0bf92072b2afbaf05f90
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Mon Dec 6 22:23:28 2021 +0100

    gtkmodule: Handle nested closure elements and bind them accordingly
    
    Fixes https://gitlab.gnome.org/GNOME/vala/issues/1262

 codegen/valagtkmodule.vala | 18 +++++++++++++++---
 1 file changed, 15 insertions(+), 3 deletions(-)
---
diff --git a/codegen/valagtkmodule.vala b/codegen/valagtkmodule.vala
index 01e60535f..cf7d26b55 100644
--- a/codegen/valagtkmodule.vala
+++ b/codegen/valagtkmodule.vala
@@ -29,6 +29,8 @@ public class Vala.GtkModule : GSignalModule {
        private HashMap<string, Class> cclass_to_vala_map = null;
        /* GResource name to real file name mapping */
        private HashMap<string, string> gresource_to_file_map = null;
+       /* GtkBuilder xml handler set */
+       private HashMap<string, string> handler_map = new HashMap<string, string>(str_hash, str_equal);
        /* GtkBuilder xml handler to Vala signal mapping */
        private HashMap<string, Property> current_handler_to_property_map = new HashMap<string, 
Property>(str_hash, str_equal);
        /* GtkBuilder xml handler to Vala signal mapping */
@@ -142,12 +144,14 @@ public class Vala.GtkModule : GSignalModule {
                        Report.error (node.source_reference, "UI resource not found: `%s'. Please make sure 
to specify the proper GResources xml files with --gresources and alternative search locations with 
--gresourcesdir.", ui_resource);
                        return;
                }
+               handler_map = new HashMap<string, string>(str_hash, str_equal);
                current_handler_to_signal_map = new HashMap<string, Signal>(str_hash, str_equal);
                current_child_to_class_map = new HashMap<string, Class>(str_hash, str_equal);
 
                MarkupReader reader = new MarkupReader (ui_file);
                Class current_class = null;
                Property? current_property = null;
+               string? current_handler = null;
 
                bool template_tag_found = false;
                MarkupTokenType current_token = reader.read_token (null, null);
@@ -235,7 +239,12 @@ public class Vala.GtkModule : GSignalModule {
 
                                        //TODO Retrieve signature declaration? c-type to vala-type?
                                        current_handler_to_property_map.set (handler_name, current_property);
+                                       current_handler = handler_name;
                                        current_property = null;
+                               } else if (current_handler != null) {
+                                       // Track nested closure elements
+                                       handler_map.set (handler_name, current_handler);
+                                       current_handler = handler_name;
                                }
                        }
                        current_token = reader.read_token (null, null);
@@ -374,9 +383,10 @@ public class Vala.GtkModule : GSignalModule {
 
                /* Handler name as defined in the gtkbuilder xml */
                var handler_name = m.get_attribute_string ("GtkCallback", "name", m.name);
+               var callback = handler_map.get (handler_name);
                var sig = current_handler_to_signal_map.get (handler_name);
                var prop = current_handler_to_property_map.get (handler_name);
-               if (sig == null && prop == null) {
+               if (callback == null && sig == null && prop == null) {
                        Report.error (m.source_reference, "could not find signal or property for handler 
`%s'", handler_name);
                        return;
                }
@@ -400,8 +410,10 @@ public class Vala.GtkModule : GSignalModule {
                                ccode.add_expression (call);
                        }
                }
-               if (prop != null) {
-                       prop.check (context);
+               if (prop != null || callback != null) {
+                       if (prop != null) {
+                               prop.check (context);
+                       }
                        //TODO Perform signature check
                        var call = new CCodeFunctionCall (new CCodeIdentifier 
("gtk_widget_class_bind_template_callback_full"));
                        call.add_argument (new CCodeIdentifier ("GTK_WIDGET_CLASS (klass)"));