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with Interfaces.C;
with System;
use type System.Address;
use type Interfaces.C.int;
use type Interfaces.C.unsigned_long;


package body FLTK.Widgets.Menus is


    function Shortcut
           (Key : Pressable_Key)
        return Shortcut_Key is
    begin
        return This : Shortcut_Key do
            This.Modifier := Mod_None;
            This.Keypress := Key;
        end return;
    end Shortcut;




    function Key_To_C
           (Key : Shortcut_Key)
        return Interfaces.C.unsigned_long is
    begin
        return Interfaces.C.unsigned_long (Key.Modifier) *
               65536 + Character'Pos (Key.Keypress);
    end Key_To_C;




    function "+"
           (Left, Right : in Modifier_Key)
        return Modifier_Key is
    begin
        return Left or Right;
    end "+";




    function "+"
           (Left  : in Modifier_Key;
            Right : in Pressable_Key)
        return Shortcut_Key is
    begin
        return This : Shortcut_Key do
            This.Modifier := Left;
            This.Keypress := Right;
        end return;
    end "+";




    function "+"
           (Left  : in Modifier_Key;
            Right : in Shortcut_Key)
        return Shortcut_Key is
    begin
        return This : Shortcut_Key do
            This.Modifier := Left or Right.Modifier;
            This.Keypress := Right.Keypress;
        end return;
    end "+";




    function "+"
           (Left, Right : in Menu_Flag)
        return Menu_Flag is
    begin
        return Left or Right;
    end "+";




    function fl_menu_add
           (M    : in System.Address;
            T    : in Interfaces.C.char_array;
            S    : in Interfaces.C.unsigned_long;
            C, U : in System.Address;
            F    : in Interfaces.C.unsigned_long)
        return Interfaces.C.int;
    pragma Import (C, fl_menu_add, "fl_menu_add");




    procedure Item_Hook (M, U : in System.Address);
    pragma Convention (C, Item_Hook);

    procedure Item_Hook
           (M, U : in System.Address) is

        Ada_Widget : access Widget'Class :=
            Widget_Convert.To_Pointer (fl_widget_get_user_data (M));

        Action : access Widget_Callback'Class :=
            Callback_Convert.To_Pointer (U);

    begin
        Action.Call (Ada_Widget.all);
    end Item_Hook;




    procedure Add
           (This     : in out Menu;
            Text     : in     String;
            Action   : access Widget_Callback'Class := null;
            Shortcut : in     Shortcut_Key := No_Key;
            Flags    : in     Menu_Flag := Flag_Normal)
    is
        Place : Interfaces.C.int;
        Callback, User_Data : System.Address;
    begin
        if Action = null then
            Callback := System.Null_Address;
            User_Data := System.Null_Address;
        else
            Callback := Item_Hook'Address;
            User_Data := Callback_Convert.To_Address (Action);
        end if;

        Place := fl_menu_add
               (This.Void_Ptr,
                Interfaces.C.To_C (Text),
                Key_To_C (Shortcut),
                Callback,
                User_Data,
                Interfaces.C.unsigned_long (Flags));
    end Add;


end FLTK.Widgets.Menus;