Reuse ImportHelper/ExportHelper everywhere possible for consistency

src/ifcsverchok/__init__.py

@@ -32,6 +32,7 @@ import importlib
 import logging
 import types
 import bpy
+from bpy_extras.io_utils import ExportHelper
 
 logger = logging.getLogger("sverchok.ifc")
 
@@ -180,15 +181,15 @@ class IFC_Sv_UpdateCurrent(bpy.types.Operator):
         return {"FINISHED"}
 
 
-class IFC_Sv_write_file(bpy.types.Operator):
+class IFC_Sv_write_file(bpy.types.Operator, ExportHelper):
     bl_idname = "ifc.write_file_panel"
     bl_label = "Write File"
     bl_options = {"REGISTER", "UNDO"}
     bl_description = "Save transient IFC file to the provided path."
-    filepath: bpy.props.StringProperty(subtype="FILE_PATH")
     filter_glob: bpy.props.StringProperty(default="*.ifc", options={"HIDDEN"})
     node_group: bpy.props.StringProperty(default="")
     force_mode: bpy.props.BoolProperty(default=False)
+    filename_ext = ".ifc"
 
     @classmethod
     def poll(cls, context):
@@ -264,10 +265,6 @@ class IFC_Sv_write_file(bpy.types.Operator):
             self.report({"INFO"}, f"File written to: {self.filepath}")
         return {"FINISHED"}
 
-    def invoke(self, context, event):
-        context.window_manager.fileselect_add(self)
-        return {"RUNNING_MODAL"}
-
 
 class IFC_PT_write_file_panel(bpy.types.Panel):
     bl_idname = "IFC_PT_write_file_panel"