io_import_scene_mhx.py

                row.label(left)
                row.label(right)
            else:
                for (n, name, prop) in [left,right]:
                    row.prop(amt, "layers", index=n, toggle=True, text=name)
        return

class VIEW3D_OT_MhxEnableAllLayersButton(bpy.types.Operator):
    bl_idname = "mhx.pose_enable_all_layers"
    bl_label = "Enable all layers"

    def execute(self, context):
        rig = getMhxRig(context.object)
        for (left,right) in MhxLayers:
            if type(left) != str:
                for (n, name, prop) in [left,right]:
                    rig.data.layers[n] = True
        return{'FINISHED'}    

class VIEW3D_OT_MhxDisableAllLayersButton(bpy.types.Operator):
    bl_idname = "mhx.pose_disable_all_layers"
    bl_label = "Disable all layers"

    def execute(self, context):
        rig = getMhxRig(context.object)
        layers = 32*[False]
        pb = context.active_pose_bone
        if pb:
            for n in range(32):
                if pb.bone.layers[n]:
                    layers[n] = True
                    break
        else:
            layers[0] = True
        rig.data.layers = layers            
        return{'FINISHED'}    
                
###################################################################################    
#
#    Common functions
#
###################################################################################    
#
#   pollMhxRig(ob):
#   getMhxRig(ob):
#

def pollMhxRig(ob):
    try:
        return (ob["MhxRig"] == "MHX")
    except:
        return False
        
def getMhxRig(ob):
    if ob.type == 'ARMATURE':
        rig = ob
    elif ob.type == 'MESH':
        rig = ob.parent
    else:
        return None
    try:        
        if (rig["MhxRig"] == "MHX"):
            return rig
        else:
            return None
    except:
        return None
    
        
#
#    setInterpolation(rig):
#

def setInterpolation(rig):
    if not rig.animation_data:
        return
    act = rig.animation_data.action
    if not act:
        return
    for fcu in act.fcurves:
        for pt in fcu.keyframe_points:
            pt.interpolation = 'LINEAR'
        fcu.extrapolation = 'CONSTANT'
    return
    
###################################################################################    
#
#    initialize and register
#
###################################################################################    

def menu_func(self, context):
    self.layout.operator(ImportMhx.bl_idname, text="MakeHuman (.mhx)...")

def register():
    bpy.utils.register_module(__name__)
    bpy.types.INFO_MT_file_import.append(menu_func)

def unregister():
    try:
        bpy.utils.unregister_module(__name__)
    except:
        pass
    try:
        bpy.types.INFO_MT_file_import.remove(menu_func)
    except:
        pass

if __name__ == "__main__":
    unregister()
    register()