refactor: Abstract "SelectFMIfcFile" to "MultipleFileSelector".

The "MultipleFileSelector" class can be used by child classes to implement the option to select multiple files at once. It requires two properties, which it will update: A StringProperty for a single path and a CollectionProperty for a list of paths.

src/blenderbim/blenderbim/bim/module/fm/operator.py

@@ -24,32 +24,21 @@ import logging
 import tempfile
 import ifcopenshell
 import blenderbim.tool as tool
+from blenderbim.bim.operator import MultipleFileSelector
 
 
-class SelectFMIfcFile(bpy.types.Operator):
+class SelectFMIfcFile(MultipleFileSelector):
     bl_idname = "bim.select_fm_ifc_file"
     bl_label = "Select FM IFC File"
-    bl_options = {"REGISTER", "UNDO"}
     filename_ext = ".ifc"
     filter_glob: bpy.props.StringProperty(default="*.ifc;*.ifczip;*.ifcxml", options={"HIDDEN"})
-    filepath: bpy.props.StringProperty(subtype="FILE_PATH")
-    files: bpy.props.CollectionProperty(name="File Path", type=bpy.types.OperatorFileListElement)
 
     def execute(self, context):
         props = context.scene.BIMFMProperties
-        props.ifc_files.clear()
+
-        dirname = os.path.dirname(self.filepath)
+        self.update_props(props, "ifc_file", props.ifc_files)
-        for f in self.files:
-            new = props.ifc_files.add()
-            new.name = os.path.join(dirname, f.name)
-        props.ifc_file = self.filepath
         return {"FINISHED"}
 
-    def invoke(self, context, event):
-        context.window_manager.fileselect_add(self)
-        return {"RUNNING_MODAL"}
-
-
 class ExecuteIfcFM(bpy.types.Operator):
     bl_idname = "bim.execute_ifcfm"
     bl_label = "Execute IfcFM"

src/blenderbim/blenderbim/bim/operator.py

@@ -141,6 +141,25 @@ class SelectURIAttribute(bpy.types.Operator):
         context.window_manager.fileselect_add(self)
         return {"RUNNING_MODAL"}
 
+class MultipleFileSelector(bpy.types.Operator):
+    bl_label = "Select Multiple Files"
+    bl_options = {"REGISTER", "UNDO"}
+    filepath: bpy.props.StringProperty(subtype="FILE_PATH")
+    files: bpy.props.CollectionProperty(name="File Path", type=bpy.types.OperatorFileListElement)
+
+    def update_props(self, props, single_file: str, file_list: bpy.types.CollectionProperty):
+        dirname = os.path.dirname(self.filepath)
+        file_list.clear()
+
+        for f in self.files:
+            new = file_list.add()
+            new.name = os.path.join(dirname, f.name)
+        setattr(props, single_file, self.filepath)
+
+
+    def invoke(self, context, event):
+        context.window_manager.fileselect_add(self)
+        return {"RUNNING_MODAL"}
 
 class SelectIfcFile(bpy.types.Operator, IFCFileSelector):
     bl_idname = "bim.select_ifc_file"