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al_set_display_menu - Allegro 5 API
#include <allegro5/allegro_native_dialog.h> bool al_set_display_menu(ALLEGRO_DISPLAY *display, ALLEGRO_MENU *menu)
Associates the menu with the display and shows it. If there was a previous menu associated with the display, it will be destroyed. If you don't want that to happen, you should first remove the menu with al_remove_display_menu(3alleg5). If the menu is already attached to a display, it will not be attached to the new display. If menu is NULL, the current menu will still be destroyed. Note: Attaching a menu may cause the window as available to your application to be resized! You should listen for a resize event, check how much space was lost, and resize the window accordingly if you want to maintain your window's prior size. Returns true if successful.