codegen: Generate HasParamSpec for enums/flags

Needed for the properties macro

Author: bilelmoussaoui

src/codegen/enums.rs

@@ -459,6 +459,27 @@ impl FromGlib<{sys_crate_name}::{ffi_name}> for {name} {{
         )?;
         writeln!(w)?;
 
+        version_condition(w, env, None, version, false, 0)?;
+        cfg_condition_no_doc(w, config.cfg_condition.as_ref(), false, 0)?;
+        allow_deprecated(w, enum_.deprecated_version, false, 0)?;
+        writeln!(
+            w,
+            "impl {has_param_spec} for {name} {{
+                type ParamSpec = {param_spec_enum};
+                type SetValue = Self;
+                type BuilderFn = fn(&str, Self) -> {param_spec_builder}<Self>;
+    
+                fn param_spec_builder() -> Self::BuilderFn {{
+                    |name, default_value| Self::ParamSpec::builder_with_default(name, default_value)
+                }}
+}}",
+            name = enum_.name,
+            has_param_spec = use_glib_type(env, "HasParamSpec"),
+            param_spec_enum = use_glib_type(env, "ParamSpecEnum"),
+            param_spec_builder = use_glib_type(env, "ParamSpecEnumBuilder"),
+        )?;
+        writeln!(w)?;
+
         version_condition(w, env, None, version, false, 0)?;
         cfg_condition_no_doc(w, config.cfg_condition.as_ref(), false, 0)?;
         allow_deprecated(w, enum_.deprecated_version, false, 0)?;

src/codegen/flags.rs

@@ -284,6 +284,27 @@ impl FromGlib<{sys_crate_name}::{ffi_name}> for {name} {{
         )?;
         writeln!(w)?;
 
+        version_condition(w, env, None, version, false, 0)?;
+        cfg_condition_no_doc(w, config.cfg_condition.as_ref(), false, 0)?;
+        allow_deprecated(w, flags.deprecated_version, false, 0)?;
+        writeln!(
+            w,
+            "impl {has_param_spec} for {name} {{
+                type ParamSpec = {param_spec_flags};
+                type SetValue = Self;
+                type BuilderFn = fn(&str) -> {param_spec_builder}<Self>;
+    
+                fn param_spec_builder() -> Self::BuilderFn {{
+                    |name| Self::ParamSpec::builder(name)
+                }}
+}}",
+            name = flags.name,
+            has_param_spec = use_glib_type(env, "HasParamSpec"),
+            param_spec_flags = use_glib_type(env, "ParamSpecFlags"),
+            param_spec_builder = use_glib_type(env, "ParamSpecFlagsBuilder"),
+        )?;
+        writeln!(w)?;
+
         version_condition(w, env, None, version, false, 0)?;
         cfg_condition_no_doc(w, config.cfg_condition.as_ref(), false, 0)?;
         allow_deprecated(w, flags.deprecated_version, false, 0)?;