initial code for namespace prefix lists

properties.py

@@ -1,4 +1,5 @@
 import bpy
+from bpy.types import PropertyGroup
 from bpy.props import (
                     IntProperty,
                     BoolProperty,
@@ -28,7 +29,7 @@ def update_layer_name(self, context):
     # context.object.data.layers.active.info = self.layer_name
     
 
-class GP_PG_FixSettings(bpy.types.PropertyGroup):
+class GP_PG_FixSettings(PropertyGroup):
 
     check_only : BoolProperty(
         name="Dry run mode (Check only)",
@@ -147,7 +148,7 @@ class GP_PG_FixSettings(bpy.types.PropertyGroup):
             ('UNLOCK', 'Unlock object mode', 'Toggle lock object mode Off', 2),
             ))
 
-class GP_PG_ToolsSettings(bpy.types.PropertyGroup):
+class GP_PG_ToolsSettings(PropertyGroup):
     eraser_radius : IntProperty(
         name="Eraser Radius", description="Radius of eraser brush", 
         default=20, min=0, max=500, subtype='PIXEL')
@@ -202,6 +203,7 @@ class GP_PG_ToolsSettings(bpy.types.PropertyGroup):
         description="The layer name, should describe the content of the layer",
         default="",
         update=update_layer_name)# update=None, get=None, set=None
+
     """ 
     reconnect_parent = bpy.props.PointerProperty(type =bpy.types.Object,poll=poll_armature)
     render_settings = bpy.props.BoolProperty(default = False)
@@ -221,4 +223,21 @@ class GP_PG_ToolsSettings(bpy.types.PropertyGroup):
     opacity_layers = bpy.props.FloatProperty(min=0,max=1,default = 1,update = update_layers_opacity)
 
     stroke_select =  bpy.props.EnumProperty(items = [("POINT","Point",""),("STROKE","Stroke","")],update = update_selection_mode)
-    """
+    """
+
+class GP_PG_namespace_props(PropertyGroup):
+
+    prefix : StringProperty(
+        name="Prefix", description="Layer namespace prefix",
+        default="")
+    name : StringProperty(
+        name="Name", description="Name that represent this prefix (used as hint and tooltip)",
+        default="")
+    hide : BoolProperty(
+        name="Hide", description="Hide this prefix from layer prefex management",
+        default=False)
+
+class GP_PG_namespaces(PropertyGroup):
+    idx : IntProperty(default=-1)
+
+    namespaces : bpy.props.CollectionProperty(type=GP_PG_namespace_props)