Small refactor + allowing to preview text in viewport while editing

src/blenderbim/blenderbim/bim/module/drawing/decoration.py

@@ -2073,7 +2073,10 @@ class TextDecorator(BaseDecorator):
         dir = Vector((1, 0))
         pos = location_3d_to_region_2d(region, region3d, obj.matrix_world.translation)
         font_size = DecoratorData.get_ifc_text_font_size(obj)
-        for line_i, line in enumerate(obj.BIMTextProperties.value.split("\\n")):
+        props = obj.BIMTextProperties
+        text = props.get_text() if props.is_editing else props.value
+
+        for line_i, line in enumerate(text.split("\\n")):
             self.draw_label(
                 context, line, pos, dir, gap=0, center=False, vcenter=False, font_size=font_size, line_no=line_i
             )

src/blenderbim/blenderbim/bim/module/drawing/prop.py

@@ -423,6 +423,9 @@ class BIMTextProperties(PropertyGroup):
     is_editing: BoolProperty(name="Is Editing", default=False)
     attributes: CollectionProperty(name="Attributes", type=Attribute)
     test_prop: StringProperty(name="test_prop", default="TEXT")
+    # Current text value with evaluated experessions stored in `value`.
+    # The original (Literal) value stored in `attributes['Literal']` 
+    # and can be accessed with `get_text()`
     value: StringProperty(name="Value", default="TEXT")
     font_size: EnumProperty(
         items=[
@@ -440,6 +443,10 @@ class BIMTextProperties(PropertyGroup):
         name="Box alignment", size=9, set=set_box_alignment, get=get_box_alignment, default=DEFAULT_BOX_ALIGNMENT
     )
 
+    def get_text(self):
+        text_attribute = self.attributes.get('Literal', None)
+        return text_attribute.string_value if text_attribute else self.text
+
 
 class BIMAssignedProductProperties(PropertyGroup):
     is_editing_product: BoolProperty(name="Is Editing Product", default=False)

src/blenderbim/blenderbim/bim/module/drawing/ui.py

@@ -380,6 +380,11 @@ class BIM_PT_text(Panel):
                 row.label(text=attribute["name"])
                 row.label(text=attribute["value"])
 
+            row = self.layout.row(align=True)
+            row.label(text="Current value:")
+            row.label(text=props.value)
+
+
 
 class BIM_PT_annotation_utilities(Panel):
     bl_idname = "BIM_PT_annotation_utilities"

src/blenderbim/blenderbim/bim/module/model/workspace.py

@@ -481,7 +481,6 @@ class Hotkey(bpy.types.Operator, tool.Ifc.Operator):
         return self.execute(context)
 
     def draw(self, context):
-        props = context.scene.BIMModelProperties
         if self.hotkey == "S_O":
             row = self.layout.row()
             row.prop(self, "x")

src/blenderbim/blenderbim/tool/drawing.py

@@ -538,7 +538,6 @@ class Drawing(blenderbim.core.tool.Drawing):
         value = ifc_literal.Literal
         product = cls.get_assigned_product(tool.Ifc.get_entity(obj))
         if product:
-            variables = {}
             for variable in re.findall("{{.*?}}", value):
                 value = value.replace(
                     variable, str(ifcopenshell.util.selector.get_element_value(product, variable[2:-2]) or "")