class Fl_Menu_

Class Hierarchy

Fl_Widget
   |
   +----Fl_Menu_----Fl_Menu_Item
           |
           +----Fl_Choice, Fl_Menu_Bar, Fl_Menu_Button

Include Files

#include <FL/Fl_Menu_.H>

Description

All widgets that have a menu in FLTK are subclassed off of this class. Currently FLTK provides you with Fl_Menu_Button, Fl_Menu_Bar, and Fl_Choice .

The class contains a pointer to an array of structures of type Fl_Menu_Item. The array may either be supplied directly by the user program, or it may be "private": a dynamically allocated array managed by the Fl_Menu_.

copy
down_box
global
menu

mode
remove
replace
shortcut

size
test_shortcut
text
textcolor

textfont
textsize
value

Fl_Menu_::Fl_Menu_(int x, int y, int w, int h, const char *label = 0)

Creates a new Fl_Menu_ widget using the given position, size, and label string. menu() is initialized to null.

virtual Fl_Menu_::~Fl_Menu_()

If the menu array is private the memory it uses is freed.

const Fl_Menu_Item* Fl_Menu_::menu() const

Returns a pointer to the array of Fl_Menu_Items. This will either be the value passed to menu(value) or the private copy.

void Fl_Menu_::menu(const Fl_Menu_Item*)

Set the menu array pointer directly. If the old menu is private it is deleted. NULL is allowed and acts the same as a zero-length menu. If you try to modify the array (with add(), replace(), or delete()) a private copy is automatically done.

void Fl_Menu_::copy(const Fl_Menu_Item*)

The menu is set to a private copy of the passed Fl_Menu_Item array. This is useful if you want to modify the flags of the menu items.

void Fl_Menu_::clear()

Same as menu(NULL), set the array pointer to null, indicating a zero-length menu.

int Fl_Menu_::size() const

This returns the number of Fl_Menu_Item structures that make up the menu, correctly counting submenus. This includes the "terminator" item at the end. To copy a menu array you need to copy size()*sizeof(Fl_Menu_Item) bytes. If the menu is NULL this returns zero (an empty menu will return 1).

int Fl_Menu_::add(const char* label, const char* shortcut, Fl_Callback, void user_data=0, int flags=0)

Adds a new menu item, with a title string, shortcut string, callback, argument to the callback, and flags. If the menu array was directly set with menu(x) then copy() is done to make a private array.

Text is a string of the form "foo/bar/baz", this example will result in a submenu called "foo" and one in that called "bar" and and entry called "baz". The text is copied to new memory and can be freed. The other arguments (including the shortcut) are copied into the menu item unchanged.

If an item exists already with that name then it is replaced with this new one. Otherwise this new one is added to the end of the correct menu or submenu. The return value is the offset into the array that the new entry was placed at.

The return value is the index into the array that the entry was put.

int Fl_Menu_::add(const char *)

The passed string is split at any '|' characters and then add(s,0,0,0,0) is done with each section. This is often useful if you are just using the value, and is compatable with Forms and other GL programs.

void Fl_Menu_::replace(int n, const char *)

Changes the text of item n. This is the only way to get slash into an add()'ed menu item. If the menu array was directly set with menu(x) then copy() is done to make a private array.

void Fl_Menu_::remove(int n)

Deletes item n from the menu. If the menu array was directly set with menu(x) then copy() is done to make a private array.

void Fl_Menu_::shortcut(int i, int n);

Changes the shortcut of item i to n.

void Fl_Menu_::mode(int i, int x);

Changes the flags of item i. For a list of the flags, see Fl_Menu_Item.

int Fl_Menu_::value() const
int Fl_Menu_::value(int)
const Fl_Menu_Item* mvalue() const
int Fl_Menu_::value(const Fl_Menu_Item*)

The value is the index into menu() of the last item chosen by the user. It is zero initially. You can set it as an integer, or set it with a pointer to a menu item. The set routines return non-zero if the new value is different than the old one.

const Fl_Menu_Item* Fl_Menu_::test_shortcut()

Only call this in response to FL_SHORTCUT events. If the event matches an entry in the menu that entry is selected and the callback will be done (or changed() will be set). This allows shortcuts directed at one window to call menus in another.

void Fl_Menu_::global()

Make the shortcuts for this menu work no matter what window has the focus when you type it. This is done by using Fl::add_handler(). This Fl_Menu_ widget does not have to be visible (ie the window it is in can be hidden, or it does not have to be put in a window at all).

Currently there can be only one global()menu. Setting a new one will replace the old one. There is no way to remove the global() setting (so don't destroy the widget!)