Layer actions and navigations features

1.9.0

- feat: New shortcuts:
  - `F2` in Paint and Edit to rename active layer
  - `Insert` add a new layer (same as Krita)
  - `Shift + Insert` add a new layer and immediately pop-up a rename box
  - `page up / page down` change active layer up/down with a temporary fade (settings in addon prefs)
- fix: error when tweaking `gp.duplicate_send_to_layer` shortcut

utils.py

@@ -30,19 +30,14 @@ def set_matrix(gp_frame,mat):
 
 # get view vector location (the 2 methods work fine)
 def get_view_origin_position():
-    #method 1
+    ## method 1
     # from bpy_extras import view3d_utils
     # region = bpy.context.region
     # rv3d = bpy.context.region_data
     # view_loc = view3d_utils.region_2d_to_origin_3d(region, rv3d, (region.width/2.0, region.height/2.0))
-    # print("view_loc1", view_loc)#Dbg
-
-    #method 2
+    ## method 2
     r3d = bpy.context.space_data.region_3d
     view_loc2 = r3d.view_matrix.inverted().translation
-    # print("view_loc2", view_loc2)#Dbg
-    # if view_loc != view_loc2: print('Might be an error when finding view coordinate')
-
     return view_loc2
 
 def location_to_region(worldcoords):
@@ -76,6 +71,10 @@ def object_derived_get(ob, scene):
     return ob_matrix_pairs
 
 
+# -----------------
+### Bmesh
+# -----------------
+
 def link_vert(v,ordered_vert) :
     for e in v.link_edges :
         other_vert = e.other_vert(v)
@@ -147,7 +146,11 @@ def gp_stroke_to_bmesh(strokes):
     return strokes_info
 
 
-def simple_draw_gp_stroke(pts,frame,width = 2, mat_id = 0):
+# -----------------
+### GP Drawing
+# -----------------
+
+def simple_draw_gp_stroke(pts, frame, width = 2, mat_id = 0):
     '''
     draw basic stroke by passing list of point 3D coordinate
     the frame to draw on and optional width parameter (default = 2)
@@ -169,11 +172,11 @@ def simple_draw_gp_stroke(pts,frame,width = 2, mat_id = 0):
     return stroke
 
 ## OLD - need update
-def draw_gp_stroke(loop_info,frame,palette,width = 2) :
+def draw_gp_stroke(loop_info, frame, palette, width = 2) :
     stroke = frame.strokes.new(palette)
 
     stroke.line_width = width
-    stroke.display_mode = '3DSPACE'# old->draw_mode
+    stroke.display_mode = '3DSPACE'# old -> draw_mode
 
     for i,info in enumerate(loop_info) :
         stroke.points.add()
@@ -894,13 +897,6 @@ def draw_kmi(km, kmi, layout):
 ### linking utility
 # -----------------
 
-"""
-def link_objects_in_blend(filepath, obj_name, link=True):
-    '''Link an object by name from a file, if link is False, append instead of linking'''
-    with bpy.data.libraries.load(filepath, link=link) as (data_from, data_to):
-        data_to.objects = [o for o in data_from.objects if o == obj_name] # c.startswith(obj_name)
-    return data_to.objects
- """
 def link_objects_in_blend(filepath, obj_name_list, link=True):
     '''Link an object by name from a file, if link is False, append instead of linking'''
     if isinstance(obj_name_list, str):
@@ -922,4 +918,37 @@ def check_objects_in_blend(filepath, avoid_camera=True):
             l = [o for o in data_from.objects if not any(x in o.lower() for x in ('camera', 'draw_cam', 'obj_cam'))]
         else:
             l = [o for o in data_from.objects]
-    return l
+    return l
+
+
+# -----------------
+### props handling
+# -----------------
+
+def iterate_selector(zone, attr, state, info_attr = None, active_access='active'):
+    '''Iterate with given attribute'''
+    item_number = len(zone)
+    if item_number <= 1:
+        return
+
+    if getattr(zone, attr) == None:
+        print('no', attr, 'in', zone)
+        return
+
+    if state: # swap
+        info = None
+        bottom = None
+        new_index = getattr(zone, attr) + state
+        setattr(zone, attr, new_index % item_number)
+
+        if new_index == item_number:
+            bottom = 1 # bottom reached, cycle to first
+        elif new_index < 0:
+            bottom = -1 # up reached, cycle to last
+
+        if info_attr:
+            active_item = getattr(zone, active_access) # active by default
+            if active_item:
+                info = getattr(active_item, info_attr)
+
+        return info, bottom