rogue_weights.py

@@ -1,4 +1,4 @@
-from typing import List, Tuple
+from typing import List
 
 import bpy, sys
 from bpy.props import IntProperty, CollectionProperty, PointerProperty, StringProperty, BoolProperty
@@ -8,6 +8,7 @@ import itertools
 import bmesh
 
 from .vertex_group_operators import get_deforming_armature, get_deforming_vgroups
+from .utils.naming import flip_name
 
 """
 This module creates a workflow for hunting down and cleaning up rogue weights in the most efficient way possible.
@@ -120,6 +121,24 @@ def select_vertices(mesh: Mesh, vert_indicies: List[int]):
 	for vi in vert_indicies:
 		mesh.vertices[vi].select = True
 
+def update_active_islands_index(obj):
+	"""Make sure the active entry is visible, keep incrementing index until that is the case."""
+	new_active_index = obj.active_islands_index + 1
+	looped = False
+	while True:
+		if new_active_index >= len(obj.island_groups):
+			new_active_index = 0
+			if looped:
+				break
+			looped = True
+		island_group = obj.island_groups[new_active_index]
+		if len(island_group.islands) < 2 or \
+			len(island_group.islands) == island_group.num_expected_islands:
+			new_active_index += 1
+			continue
+		break
+	obj.active_islands_index = new_active_index
+
 class MarkIslandsAsOkay(Operator):
 	"""Mark this number of vertex islands to be the intended amount. Vertex group will be hidden from the list until this number changes"""
 	bl_idname = "object.set_expected_island_count"
@@ -133,7 +152,6 @@ class MarkIslandsAsOkay(Operator):
 	)
 
 	def execute(self, context):
-		rig = context.pose_object
 		obj = context.object
 		mesh = obj.data
 		org_mode = obj.mode
@@ -157,6 +175,7 @@ class MarkIslandsAsOkay(Operator):
 			return {'FINISHED'}
 		
 		island_group.num_expected_islands = new_num_islands
+		update_active_islands_index(obj)
 		return {'FINISHED'}
 
 class FocusSmallestIsland(Operator):
@@ -189,22 +208,32 @@ class FocusSmallestIsland(Operator):
 
 		assert self.vgroup in obj.vertex_groups, f"Vertex Group {self.vgroup} not found in object {obj.name}, aborting."
 
-		if self.vgroup in obj.island_groups:
-			# Update existing island data first
-			island_group = obj.island_groups[self.vgroup]
-			vgroup = obj.vertex_groups[self.vgroup]
-			bpy.ops.object.mode_set(mode='EDIT')
-			vert_index_map = build_vert_index_map(mesh)
-			bpy.ops.object.mode_set(mode=org_mode)
-			org_num_islands = len(island_group.islands)
-			island_group = update_vgroup_islands(mesh, vgroup, vert_index_map, obj.island_groups, island_group)
-			new_num_islands = len(island_group.islands)
-			if new_num_islands != org_num_islands:
-				if new_num_islands == 1:
-					self.report({'INFO'}, f"Vertex group is now a single island, hidden from list.")
-					return {'FINISHED'}
-				self.report({'INFO'}, f"Vertex group island count changed from {org_num_islands} to {new_num_islands}. Click again to focus smallest island.")
-				return {'FINISHED'}
+		# Also update the opposite side vertex group
+		vgroup_names = [self.vgroup]
+		flipped = flip_name(self.vgroup)
+		if flipped != self.vgroup:
+			vgroup_names.append(flipped)
+
+		bpy.ops.object.mode_set(mode='EDIT')
+		vert_index_map = build_vert_index_map(mesh)
+		bpy.ops.object.mode_set(mode=org_mode)
+		hid_islands = False
+		for vg_name in vgroup_names:
+			if vg_name in obj.island_groups:
+				# Update existing island data first
+				island_group = obj.island_groups[vg_name]
+				vgroup = obj.vertex_groups[vg_name]
+				org_num_islands = len(island_group.islands)
+				island_group = update_vgroup_islands(mesh, vgroup, vert_index_map, obj.island_groups, island_group)
+				new_num_islands = len(island_group.islands)
+				if new_num_islands < 2:
+					hid_islands = True
+					self.report({'INFO'}, f"Vertex group {vg_name} no longer has multiple islands, hidden from list.")
+		if hid_islands:
+			update_active_islands_index(obj)
+			return {'FINISHED'}
+					# self.report({'INFO'}, f"Vertex group island count changed from {org_num_islands} to {new_num_islands}. Click again to focus smallest island.")
+					# return {'FINISHED'}
 
 		if org_mode != 'EDIT':
 			bpy.ops.object.mode_set(mode='EDIT')
@@ -234,6 +263,15 @@ class FocusSmallestIsland(Operator):
 		if self.enter_wp and org_mode != 'WEIGHT_PAINT':
 			bpy.ops.object.weight_paint_toggle()
 
+		# Select the bone
+		if context.mode == 'PAINT_WEIGHT':
+			rig = context.pose_object
+			if rig:
+				for pb in rig.pose.bones:
+					pb.bone.select = False
+				if self.vgroup in rig.pose.bones:
+					rig.pose.bones[self.vgroup].bone.select = True
+
 		mesh.use_paint_mask_vertex = True
 
 		return {'FINISHED'}
@@ -301,8 +339,6 @@ class EASYWEIGHT_UL_weight_island_groups(UIList):
 	def filter_items(self, context, data, propname):
 		flt_flags = []
 		flt_neworder = []
-		list_items = getattr(data, propname)
-
 		island_groups = getattr(data, propname)
 
 		helper_funcs = bpy.types.UI_UL_list