Bone Selection Sets: added popup menu for quickly selecting selection set

Pressing Shift+Alt+W pops up a menu with the different bone selection
sets for the current rig. Selecting a set will select all the bones in
that set.

This functionality was copied from [1]; that add-on has already been
used for quite a while in the Blender Animation Studio with great
succes. The main difference is that now the menu uses the selection set
index rather than the name, which means it'll work correctly even when
there are duplicate names.

[1] https://github.com/sybrenstuvel/random-blender-addons/blob/master/selection_set_selector.py

bone_selection_sets.py

@@ -18,8 +18,8 @@
 
 bl_info = {
     "name": "Bone Selection Sets",
-    "author": "Inês Almeida, Antony Riakiotakis, Dan Eicher",
     "version": (2, 0, 1),
+    "author": "Inês Almeida, Sybren A. Stüvel, Antony Riakiotakis, Dan Eicher",
     "blender": (2, 75, 0),
     "location": "Properties > Object Data (Armature) > Selection Sets",
     "description": "List of Bone sets for easy selection while animating",
@@ -129,7 +129,6 @@ class POSE_UL_selection_set(UIList):
 
 
 class POSE_MT_create_new_selection_set(Menu):
-    bl_idname = "POSE_MT_selection_set_create"
     bl_label = "Choose Selection Set"
 
     def draw(self, context):
@@ -138,6 +137,21 @@ class POSE_MT_create_new_selection_set(Menu):
             text="New Selection Set")
 
 
+class POSE_MT_selection_sets(Menu):
+    bl_label = 'Select Selection Set'
+
+    @classmethod
+    def poll(cls, context):
+        return POSE_OT_selection_set_select.poll(context)
+
+    def draw(self, context):
+        layout = self.layout
+        layout.operator_context = 'EXEC_DEFAULT'
+        for idx, sel_set in enumerate(context.object.selection_sets):
+            props = layout.operator(POSE_OT_selection_set_select.bl_idname, text=sel_set.name)
+            props.selection_set_index = idx
+
+
 # Operators ###################################################################
 
 class PluginOperator(Operator):
@@ -336,12 +350,22 @@ class POSE_OT_selection_set_select(NeedSelSetPluginOperator):
     bl_description = "Add Selection Set bones to current selection"
     bl_options = {'UNDO', 'REGISTER'}
 
+    selection_set_index = IntProperty(
+        name='Selection Set Index',
+        default=-1,
+        description='Which Selection Set to select; -1 uses the active Selection Set')
+
     def execute(self, context):
         arm = context.object
-        act_sel_set = arm.selection_sets[arm.active_selection_set]
+
+        if self.selection_set_index == -1:
+            idx = arm.active_selection_set
+        else:
+            idx = self.selection_set_index
+        sel_set = arm.selection_sets[idx]
 
         for bone in context.visible_pose_bones:
-            if bone.name in act_sel_set.bone_ids:
+            if bone.name in sel_set.bone_ids:
                 bone.bone.select = True
 
         return {'FINISHED'}
@@ -381,6 +405,7 @@ class POSE_OT_selection_set_add_and_assign(PluginOperator):
 classes = (
     POSE_MT_create_new_selection_set,
     POSE_MT_selection_sets_specials,
+    POSE_MT_selection_sets,
     POSE_PT_selection_sets,
     POSE_UL_selection_set,
     SelectionEntry,
@@ -398,6 +423,10 @@ classes = (
 )
 
 
+def add_sss_button(self, context):
+    self.layout.menu('POSE_MT_selection_sets')
+
+
 def register():
     for cls in classes:
         bpy.utils.register_class(cls)
@@ -413,6 +442,14 @@ def register():
             default=0
             )
 
+    wm = bpy.context.window_manager
+    km = wm.keyconfigs.active.keymaps['Pose']
+
+    kmi = km.keymap_items.new('wm.call_menu', 'W', 'PRESS', alt=True, shift=True)
+    kmi.properties.name = 'POSE_MT_selection_sets'
+
+    bpy.types.VIEW3D_MT_select_pose.append(add_sss_button)
+
 
 def unregister():
     for cls in classes: