Menu(bpy_struct)

Basic Menu Example

This script is a simple menu, menus differ from panels in that they must reference from a header, panel or another menu.

Notice the ‘CATEGORY_MT_name’ Menu.bl_idname, this is a naming convention for menus.

Note

Menu subclasses must be registered before referencing them from blender.

Note

Menu’s have their Layout.operator_context initialized as ‘EXEC_REGION_WIN’ rather then ‘INVOKE_DEFAULT’, so if the operator context needs to initialize inputs from the Operator.invoke function then this needs to be explicitly set.

import bpy


class BasicMenu(bpy.types.Menu):
    bl_idname = "OBJECT_MT_select_test"
    bl_label = "Select"

    def draw(self, context):
        layout = self.layout

        layout.operator("object.select_all", text="Select/Deselect All")
        layout.operator("object.select_inverse", text="Inverse")
        layout.operator("object.select_random", text="Random")


bpy.utils.register_class(BasicMenu)

# test call to display immediately.
bpy.ops.wm.call_menu(name="OBJECT_MT_select_test")

Submenus

This menu demonstrates some different functions.

import bpy


class SubMenu(bpy.types.Menu):
    bl_idname = "OBJECT_MT_select_submenu"
    bl_label = "Select"

    def draw(self, context):
        layout = self.layout

        layout.operator("object.select_all", text="Select/Deselect All")
        layout.operator("object.select_inverse", text="Inverse")
        layout.operator("object.select_random", text="Random")

        # access this operator as a submenu
        layout.operator_menu_enum("object.select_by_type", "type", text="Select All by Type...")

        layout.separator()

        # expand each operator option into this menu
        layout.operator_enum("object.lamp_add", "type")

        layout.separator()

        # use existing memu
        layout.menu("VIEW3D_MT_transform")


bpy.utils.register_class(SubMenu)

# test call to display immediately.
bpy.ops.wm.call_menu(name="OBJECT_MT_select_submenu")

Extending Menus

When creating menus for addons you can’t reference menus in blenders default scripts.

Instead the addon can add menu items to existing menus.

The function menu_draw acts like Menu.draw

import bpy


def menu_draw(self, context):
    self.layout.operator("wm.save_homefile")

bpy.types.INFO_MT_file.append(menu_draw)

base class — bpy_struct

class bpy.types.Menu(bpy_struct)

Editor menu containing buttons

bl_idname

If this is set, the menu gets a custom ID, otherwise it takes the name of the class used to define the panel. For example, if the class name is “OBJECT_MT_hello”, and bl_idname is not set by the script, then bl_idname = “OBJECT_MT_hello”

Type :string, default “”

bl_label

The menu label

Type :string, default “”

layout

Defines the structure of the menu in the UI.

Type :UILayout, (readonly)

classmethod poll(context)

If this method returns a non-null output, then the menu can be drawn.

Return type:boolean

draw(context)

Draw UI elements into the menu UI layout.

classmethod append(draw_func)

Append a draw function to this menu, takes the same arguments as the menus draw function.

draw_preset(context)

Define these on the subclass - preset_operator - preset_subdir

path_menu(searchpaths, operator, props_default={})

classmethod prepend(draw_func)

Prepend a draw function to this menu, takes the same arguments as the menus draw function.

classmethod remove(draw_func)

Remove a draw function that has been added to this menu

Inherited Properties

bpy_struct.id_data

Inherited Functions

bpy_struct.as_pointer bpy_struct.callback_add bpy_struct.callback_remove bpy_struct.driver_add bpy_struct.driver_remove bpy_struct.get bpy_struct.is_property_hidden bpy_struct.is_property_set

bpy_struct.items bpy_struct.keyframe_delete bpy_struct.keyframe_insert bpy_struct.keys bpy_struct.path_from_id bpy_struct.path_resolve bpy_struct.type_recast bpy_struct.values