Blender - Toggle Visibility of Modifier by Type using Shift+Q, for https://blender.stackexchange.com/q/46848/ #Blender #BSE

blender-toggle-modifier-visibility.py

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#
#  This program is free software; you can redistribute it and/or
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#  as published by the Free Software Foundation; either version 2
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bl_info = {
    "name": "Toggle Modifier Visibility",
    "description": "Toggle modifier visibility for all objects in selection",
    "author": "p2or",
    "version": (0, 2),
    "blender": (2, 93, 0),
    "tracker_url": "https://gist.github.com/p2or/e0568d20cca23c8f5673",
    "location": "3D View",
    "category": "3D View"
}

import bpy
from bpy.types import Modifier, AddonPreferences, Operator
from bpy.props import EnumProperty

class OBJECT_AP_toggleModifier(AddonPreferences):
    bl_idname = __name__
    
    items = [
        (p.identifier, p.name, p.description, p.icon, c)
        for c, p in enumerate(Modifier.bl_rna.properties["type"].enum_items)
            ]
    
    modifier_type: EnumProperty(
        items=items,
        name="Toggle",
        default='SUBSURF')

    def draw(self, context):
        layout = self.layout
        layout.prop(self, "modifier_type")


class OBJECT_OT_toggleModifierVisibility(bpy.types.Operator):
    bl_idname = "view3d.toggle_modifier_visibility"
    bl_label = "Toggle Modifier Visibility"
    bl_options = {'REGISTER', 'UNDO'}
    
    @classmethod
    def poll(cls, context):
        return len(context.selected_objects)
    
    def execute(self, context):
        prefs = context.preferences.addons[__name__].preferences
        candidates = [] #candidates.setdefault(ob, []).append(m)
        for ob in context.selected_objects:
            for m in ob.modifiers:
                if m.type == prefs.modifier_type:
                    candidates.append(m)
        
        for subsurf in candidates:
            subsurf.show_viewport = not subsurf.show_viewport
        
        if candidates:
            self.report({'INFO'}, "{}: {}".format(
                    prefs.modifier_type.title(), 
                    ['Off','On'][candidates[0].show_viewport]))
        
        return {'FINISHED'}


addon_keymaps = []

def register():
    bpy.utils.register_class(OBJECT_AP_toggleModifier)
    bpy.utils.register_class(OBJECT_OT_toggleModifierVisibility)

    wm = bpy.context.window_manager
    kc = wm.keyconfigs.addon
    if kc:
        km = wm.keyconfigs.addon.keymaps.new(name='3D View', space_type='VIEW_3D')
        kmi = km.keymap_items.new(OBJECT_OT_toggleModifierVisibility.bl_idname, type='Q', value='PRESS', shift=True)
        addon_keymaps.append((km, kmi))

def unregister():
    for km, kmi in addon_keymaps:
        km.keymap_items.remove(kmi)
    addon_keymaps.clear()

    bpy.utils.unregister_class(OBJECT_OT_toggleModifierVisibility)
    bpy.utils.unregister_class(OBJECT_AP_toggleModifier)

if __name__ == "__main__":
    register()