You can now browse to select files for any URI reference attributes

src/blenderbim/blenderbim/bim/helper.py

@@ -48,6 +48,9 @@ def draw_attribute(attribute, layout, copy_operator=None):
     if copy_operator:
         op = layout.operator(f"{copy_operator}", text="", icon="COPYDOWN")
         op.name = attribute.name
+    if attribute.is_uri:
+        op = layout.operator("bim.select_uri_attribute", text="", icon="FILE_FOLDER")
+        op.data_path = attribute.path_from_id("string_value")
 
 
 def import_attributes(ifc_class, props, data, callback=None):
@@ -78,6 +81,8 @@ def import_attribute(attribute, props, data, callback=None):
         props.remove(len(props) - 1)
     elif data_type == "string":
         new.string_value = "" if new.is_null else data[attribute.name()]
+        if attribute.type_of_attribute().declared_type().name() == "IfcURIReference":
+            new.is_uri = True
     elif data_type == "boolean":
         new.bool_value = False if new.is_null else data[attribute.name()]
     elif data_type == "integer":

src/blenderbim/blenderbim/bim/operator.py

@@ -39,6 +39,39 @@ class OpenUri(bpy.types.Operator):
         return {"FINISHED"}
 
 
+class SelectURIAttribute(bpy.types.Operator):
+    bl_idname = "bim.select_uri_attribute"
+    bl_label = "Select URI Attribute"
+    bl_options = {"REGISTER", "UNDO"}
+    bl_description = "Select a local file"
+    data_path: bpy.props.StringProperty(name="Data Path")
+    filepath: bpy.props.StringProperty(subtype="FILE_PATH")
+
+    def execute(self, context):
+        # data_path contains the latter half of the path to the string_value property
+        # I have no idea how to find out the former half, so let's just use brute force.
+        data_path = self.data_path.replace(".string_value", "")
+        attribute = None
+        try:
+            attribute = eval(f"bpy.context.scene.{data_path}")
+        except:
+            try:
+                attribute = eval(f"bpy.context.active_object.{data_path}")
+            except:
+                try:
+                    attribute = eval(f"bpy.context.active_object.active_material.{data_path}")
+                except:
+                    # Do you know a better way?
+                    pass
+        if attribute:
+            attribute.string_value = self.filepath
+        return {"FINISHED"}
+
+    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"
     bl_label = "Select IFC File"

src/blenderbim/blenderbim/bim/prop.py

@@ -190,10 +190,11 @@ class Attribute(PropertyGroup):
     bool_value: BoolProperty(name="Value", update=updateAttributeValue)
     int_value: IntProperty(name="Value", update=updateAttributeValue)
     float_value: FloatProperty(name="Value", update=updateAttributeValue)
-    is_null: BoolProperty(name="Is Null")
-    is_optional: BoolProperty(name="Is Optional")
     enum_items: StringProperty(name="Value")
     enum_value: EnumProperty(items=getAttributeEnumValues, name="Value", update=updateAttributeValue)
+    is_null: BoolProperty(name="Is Null")
+    is_optional: BoolProperty(name="Is Optional")
+    is_uri: BoolProperty(name="Is Uri", default=False)
 
     def get_value(self):
         if self.is_null: