Multiple literals in 1 Ifc Text + aggregated text annotations

Added option to store multiple literals inside 1 Ifc text object.

If multiple literals share the same `BoxAlignment` then only the first one will be displayed in viewport
to prevent visual clutter (although added small asterisk symbol to indicate that there are still multiple literals).

Added option for aggregated text annotations. Example - "door-tag" symbol.
If you create text, specify "door-tag" symbol in EPset_Annotation.Symbol
\and add two literals to it then they'll automatically will fit to that door-tag in the svg drawing
(https://i.imgur.com/OXaIlWe.png).

The way it works - you define symbol in symbols.svg (or in your own symbols svg file)
and then add the `<text>` fields where text from literals will fit right in.
The imporant note: `<text>` tag must have attribute `data-type="text-template"` for it to work.
For example: `<text text-anchor="middle" dominant-baseline="middle" data-type="text-template"></text>`

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

@@ -20,7 +20,13 @@ import bpy
 import blenderbim.bim.helper
 import blenderbim.tool as tool
 from bpy.types import Panel
-from blenderbim.bim.module.drawing.data import ProductAssignmentsData, TextData, SheetsData, SchedulesData, DrawingsData
+from blenderbim.bim.module.drawing.data import (
+    ProductAssignmentsData,
+    SheetsData,
+    SchedulesData,
+    DrawingsData,
+    DecoratorData,
+)
 
 
 class BIM_PT_camera(Panel):
@@ -340,10 +346,8 @@ class BIM_PT_text(Panel):
         return element.is_a("IfcAnnotation") and element.ObjectType in ["TEXT", "TEXT_LEADER"]
 
     def draw(self, context):
-        if not TextData.is_loaded:
-            TextData.load()
-
-        props = context.active_object.BIMTextProperties
+        obj = context.active_object
+        props = obj.BIMTextProperties
 
         if props.is_editing:
             # shares most of the code with EditTextPopup.draw()
@@ -351,38 +355,53 @@ class BIM_PT_text(Panel):
 
             row = self.layout.row(align=True)
             row.operator("bim.edit_text", icon="CHECKMARK")
+            row.operator("bim.add_text_literal", icon="ADD", text="")
             row.operator("bim.disable_editing_text", icon="CANCEL", text="")
-            # skip BoxAlignment since we're going to format it ourselves
-            attributes = [a for a in props.attributes if a.name != "BoxAlignment"]
-            blenderbim.bim.helper.draw_attributes(attributes, self.layout)
+
             row = self.layout.row(align=True)
             row.prop(props, "font_size")
 
-            # a bit hacky way to align box alignment widget
-            rows = [self.layout.row(align=True) for i in range(3)]
-            for i in range(9):
-                if i % 3 == 0:
-                    split = rows[i // 3].split(factor=0.1, align=True)
-                    split.column()
-                split.prop(props, "box_alignment", text="", index=i)
+            for i, literal_props in enumerate(props.literals):
+                box = self.layout.box()
+                row = self.layout.row(align=True)
 
-            text_lines = ["Text box alignment:", props.attributes["BoxAlignment"].string_value, ""]
-            for i in range(3):
-                split = rows[i].split(factor=0.1, align=False)
-                split.column()
-                split.label(text=text_lines[i])
+                row = box.row(align=True)
+                row.label(text=f"Literal[{i}]:")
+                row.operator("bim.remove_text_literal", icon="X", text="").literal_prop_id = i
+
+                # skip BoxAlignment since we're going to format it ourselves
+                attributes = [a for a in literal_props.attributes if a.name != "BoxAlignment"]
+                blenderbim.bim.helper.draw_attributes(attributes, box)
+
+                # a bit hacky way to align box alignment widget
+                rows = [box.row(align=True) for i in range(3)]
+                for i in range(9):
+                    if i % 3 == 0:
+                        split = rows[i // 3].split(factor=0.1, align=True)
+                        split.column()
+                    split.prop(literal_props, "box_alignment", text="", index=i)
+
+                text_lines = ["Text box alignment:", literal_props.attributes["BoxAlignment"].string_value, ""]
+                for i in range(3):
+                    split = rows[i].split(factor=0.1, align=False)
+                    split.column()
+                    split.label(text=text_lines[i])
         else:
+            text_data = DecoratorData.get_ifc_text_data(obj)
+
             row = self.layout.row()
             row.operator("bim.enable_editing_text", icon="GREASEPENCIL")
 
-            for attribute in TextData.data["attributes"]:
-                row = self.layout.row(align=True)
-                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)
+            row.label(text="FontSize")
+            row.label(text=str(text_data["FontSize"]))
+
+            for literal_data in text_data["Literals"]:
+                box = self.layout.box()
+                for attribute in literal_data:
+                    row = box.row(align=True)
+                    row.label(text=attribute)
+                    row.label(text=literal_data[attribute])
 
 
 class BIM_PT_annotation_utilities(Panel):