regenerate if needed in update_callback

1) introduce can_regenerate so we only regenerate when necessary
2) no notifications of missing glyphs when rendering
3) use frame_change_pre instead of post

__init__.py

@@ -180,10 +180,13 @@ class ABC3D_text_properties(bpy.types.PropertyGroup):
 
     def glyphs_update_callback(self, context):
         butils.prepare_text(self.font_name, self.face_name, self.text)
-        butils.set_text_on_curve(self)
+        butils.set_text_on_curve(self, can_regenerate=True)
 
     def update_callback(self, context):
+        try:
             butils.set_text_on_curve(self)
+        except (AttributeError, TypeError):
+            butils.set_text_on_curve(self, can_regenerate=True)
 
     def font_update_callback(self, context):
         font_name, face_name = self.font.split(" ")
@@ -1321,8 +1324,8 @@ class ABC3D_OT_PlaceText(bpy.types.Operator):
             # t['font'] = self.font # enums want to be set as attribute
             t["font_name"] = self.font_name
             t["face_name"] = self.face_name
-            t.text_object = selected
+            t["text_object"] = selected
-            t["text"] = self.text
+            t.text = self.text
             t["letter_spacing"] = self.letter_spacing
             t["font_size"] = self.font_size
             t["offset"] = self.offset
@@ -1829,9 +1832,10 @@ def load_used_glyphs():
 def load_handler(self, dummy):
     if not bpy.app.timers.is_registered(butils.execute_queued_functions):
         bpy.app.timers.register(butils.execute_queued_functions)
+        butils.run_in_main_thread(butils.register_installed_fonts)
         butils.run_in_main_thread(butils.update_available_fonts)
-        butils.run_in_main_thread(bpy.ops.abc3d.load_installed_fonts)
         butils.run_in_main_thread(load_used_glyphs)
+        butils.run_in_main_thread(butils.update_types)
 
 
 def load_handler_unload():
@@ -1910,19 +1914,18 @@ def register():
     # and autostart if we reload script
     load_handler(None, None)
 
-    if on_frame_changed not in bpy.app.handlers.frame_change_post:
+    if on_frame_changed not in bpy.app.handlers.frame_change_pre:
-        bpy.app.handlers.frame_change_post.append(on_frame_changed)
+        bpy.app.handlers.frame_change_pre.append(on_frame_changed)
 
     if on_depsgraph_update not in bpy.app.handlers.depsgraph_update_post:
         bpy.app.handlers.depsgraph_update_post.append(on_depsgraph_update)
 
     butils.run_in_main_thread(butils.clear_available_fonts)
-    # butils.run_in_main_thread(butils.load_installed_fonts)
+    butils.run_in_main_thread(butils.register_installed_fonts)
     butils.run_in_main_thread(butils.update_available_fonts)
+    butils.run_in_main_thread(load_used_glyphs)
     butils.run_in_main_thread(butils.update_types)
 
-    # bpy.ops.abc3d.load_installed_fonts()
-
     Font.init()
 
 
@@ -1938,8 +1941,8 @@ def unregister():
     # and when reload script
     load_handler_unload()
 
-    if on_frame_changed in bpy.app.handlers.frame_change_post:
+    if on_frame_changed in bpy.app.handlers.frame_change_pre:
-        bpy.app.handlers.frame_change_post.remove(on_frame_changed)
+        bpy.app.handlers.frame_change_pre.remove(on_frame_changed)
 
     if on_depsgraph_update in bpy.app.handlers.depsgraph_update_post:
         bpy.app.handlers.depsgraph_update_post.remove(on_depsgraph_update)

butils.py

@@ -634,7 +634,6 @@ def ShowMessageBox(title="Message Box", icon="INFO", message="", prevent_repeat=
     if prevent_repeat:
         for m in message_memory:
             if m[0] == title and m[1] == icon and m[2] == message:
-                print("PREVENT PREVENT")
                 return
         message_memory.append([title, icon, message])
     myLines = message
@@ -778,7 +777,7 @@ def is_bezier(curve):
     return True
 
 
-def will_regenerate(text_properties):
+def would_regenerate(text_properties):
     mom = text_properties.text_object
 
     if len(text_properties.text) != len(text_properties.glyphs):
@@ -844,7 +843,7 @@ def parent_to_curve(o, c):
             p = cm.vertices[0].co
             o.matrix_parent_inverse.translation = p * -1.0
 
-def set_text_on_curve(text_properties, reset_timeout_s=0.1, reset_depsgraph_n=4):
+def set_text_on_curve(text_properties, reset_timeout_s=0.1, reset_depsgraph_n=4, can_regenerate=False):
     """set_text_on_curve
 
     An earlier reset cancels the other.
@@ -880,7 +879,7 @@ def set_text_on_curve(text_properties, reset_timeout_s=0.1, reset_depsgraph_n=4)
     # elif distribution_type == "FOLLOW_PATH":
         # mom.data.use_path = True
 
-    regenerate = will_regenerate(text_properties)
+    regenerate = can_regenerate and would_regenerate(text_properties)
 
     # if we regenerate.... delete objects
     if regenerate and text_properties.get("glyphs"):
@@ -955,6 +954,7 @@ def set_text_on_curve(text_properties, reset_timeout_s=0.1, reset_depsgraph_n=4)
                     message = message + f" (replaced with '{possible_replacement}')"
                     replaced = True
 
+            if can_regenerate:
                 ShowMessageBox(
                     title="Glyph replaced" if replaced else "Glyph missing",
                     icon="INFO" if replaced else "ERROR",
@@ -998,6 +998,7 @@ def set_text_on_curve(text_properties, reset_timeout_s=0.1, reset_depsgraph_n=4)
             inner_node.parent = outer_node
             inner_node.matrix_parent_inverse = outer_node.matrix_world.inverted()
             parent_to_curve(outer_node, mom)
+            outer_node.hide_set(True)
 
             glyph_properties["glyph_object"] = outer_node
         else:
@@ -1080,7 +1081,6 @@ def set_text_on_curve(text_properties, reset_timeout_s=0.1, reset_depsgraph_n=4)
                 inner_node.rotation_mode = previous_inner_node_rotation_mode
 
             # outer_node.hide_viewport = True
-            outer_node.hide_set(True)
 
         ############### PREPARE FOR THE NEXT