mirror of https://github.com/fltk/fltk
441 lines
16 KiB
C++
441 lines
16 KiB
C++
//
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// "$Id$"
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//
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// Menu item header file for the Fast Light Tool Kit (FLTK).
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//
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// Copyright 1998-2010 by Bill Spitzak and others.
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//
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// This library is free software. Distribution and use rights are outlined in
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// the file "COPYING" which should have been included with this file. If this
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// file is missing or damaged, see the license at:
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//
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// http://www.fltk.org/COPYING.php
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//
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// Please report all bugs and problems on the following page:
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//
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// http://www.fltk.org/str.php
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//
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#ifndef Fl_Menu_Item_H
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#define Fl_Menu_Item_H
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# include "Fl_Widget.H"
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# include "Fl_Image.H"
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# if defined(__APPLE__) && defined(check)
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# undef check
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# endif
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enum { // values for flags:
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FL_MENU_INACTIVE = 1, ///< Deactivate menu item (gray out)
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FL_MENU_TOGGLE= 2, ///< Item is a checkbox toggle (shows checkbox for on/off state)
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FL_MENU_VALUE = 4, ///< The on/off state for checkbox/radio buttons (if set, state is 'on')
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FL_MENU_RADIO = 8, ///< Item is a radio button (one checkbox of many can be on)
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FL_MENU_INVISIBLE = 0x10, ///< Item will not show up (shortcut will work)
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FL_SUBMENU_POINTER = 0x20, ///< Indicates user_data() is a pointer to another menu array
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FL_SUBMENU = 0x40, ///< This item is a submenu to other items
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FL_MENU_DIVIDER = 0x80, ///< Creates divider line below this item. Also ends a group of radio buttons.
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FL_MENU_HORIZONTAL = 0x100 ///< ??? -- reserved
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};
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extern FL_EXPORT Fl_Shortcut fl_old_shortcut(const char*);
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class Fl_Menu_;
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/**
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The Fl_Menu_Item structure defines a single menu item that
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is used by the Fl_Menu_ class.
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\code
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struct Fl_Menu_Item {
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const char* text; // label()
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ulong shortcut_;
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Fl_Callback* callback_;
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void* user_data_;
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int flags;
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uchar labeltype_;
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uchar labelfont_;
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uchar labelsize_;
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uchar labelcolor_;
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};
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enum { // values for flags:
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FL_MENU_INACTIVE = 1, // Deactivate menu item (gray out)
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FL_MENU_TOGGLE = 2, // Item is a checkbox toggle (shows checkbox for on/off state)
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FL_MENU_VALUE = 4, // The on/off state for checkbox/radio buttons (if set, state is 'on')
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FL_MENU_RADIO = 8, // Item is a radio button (one checkbox of many can be on)
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FL_MENU_INVISIBLE = 0x10, // Item will not show up (shortcut will work)
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FL_SUBMENU_POINTER = 0x20, // Indicates user_data() is a pointer to another menu array
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FL_SUBMENU = 0x40, // This item is a submenu to other items
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FL_MENU_DIVIDER = 0x80, // Creates divider line below this item. Also ends a group of radio buttons.
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FL_MENU_HORIZONTAL = 0x100 // ??? -- reserved
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};
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\endcode
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Typically menu items are statically defined; for example:
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\code
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Fl_Menu_Item popup[] = {
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{"&alpha", FL_ALT+'a', the_cb, (void*)1},
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{"&beta", FL_ALT+'b', the_cb, (void*)2},
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{"gamma", FL_ALT+'c', the_cb, (void*)3, FL_MENU_DIVIDER},
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{"&strange", 0, strange_cb},
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{"&charm", 0, charm_cb},
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{"&truth", 0, truth_cb},
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{"b&eauty", 0, beauty_cb},
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{"sub&menu", 0, 0, 0, FL_SUBMENU},
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{"one"},
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{"two"},
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{"three"},
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{0},
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{"inactive", FL_ALT+'i', 0, 0, FL_MENU_INACTIVE|FL_MENU_DIVIDER},
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{"invisible",FL_ALT+'i', 0, 0, FL_MENU_INVISIBLE},
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{"check", FL_ALT+'i', 0, 0, FL_MENU_TOGGLE|FL_MENU_VALUE},
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{"box", FL_ALT+'i', 0, 0, FL_MENU_TOGGLE},
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{0}};
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\endcode
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produces:
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\image html menu.png
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\image latex menu.png "menu" width=10cm
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A submenu title is identified by the bit FL_SUBMENU in the
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flags field, and ends with a label() that is NULL.
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You can nest menus to any depth. A pointer to the first item in the
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submenu can be treated as an Fl_Menu array itself. It is also
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possible to make separate submenu arrays with FL_SUBMENU_POINTER flags.
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You should use the method functions to access structure members and
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not access them directly to avoid compatibility problems with future
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releases of FLTK.
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*/
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struct FL_EXPORT Fl_Menu_Item {
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const char *text; ///< menu item text, returned by label()
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int shortcut_; ///< menu item shortcut
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Fl_Callback *callback_; ///< menu item callback
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void *user_data_; ///< menu item user_data for the menu's callback
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int flags; ///< menu item flags like FL_MENU_TOGGLE, FL_MENU_RADIO
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uchar labeltype_; ///< how the menu item text looks like
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Fl_Font labelfont_; ///< which font for this menu item text
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Fl_Fontsize labelsize_; ///< size of menu item text
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Fl_Color labelcolor_; ///< menu item text color
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// advance N items, skipping submenus:
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const Fl_Menu_Item *next(int=1) const;
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/**
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Advances a pointer by n items through a menu array, skipping
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the contents of submenus and invisible items. There are two calls so
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that you can advance through const and non-const data.
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*/
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Fl_Menu_Item *next(int i=1) {
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return (Fl_Menu_Item*)(((const Fl_Menu_Item*)this)->next(i));}
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/** Returns the first menu item, same as next(0). */
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const Fl_Menu_Item *first() const { return next(0); }
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/** Returns the first menu item, same as next(0). */
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Fl_Menu_Item *first() { return next(0); }
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// methods on menu items:
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/**
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Returns the title of the item.
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A NULL here indicates the end of the menu (or of a submenu).
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A '&' in the item will print an underscore under the next letter,
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and if the menu is popped up that letter will be a "shortcut" to pick
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that item. To get a real '&' put two in a row.
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*/
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const char* label() const {return text;}
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/** See const char* Fl_Menu_Item::label() const */
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void label(const char* a) {text=a;}
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/** See const char* Fl_Menu_Item::label() const */
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void label(Fl_Labeltype a,const char* b) {labeltype_ = a; text = b;}
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/**
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Returns the menu item's labeltype.
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A labeltype identifies a routine that draws the label of the
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widget. This can be used for special effects such as emboss, or to use
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the label() pointer as another form of data such as a bitmap.
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The value FL_NORMAL_LABEL prints the label as text.
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*/
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Fl_Labeltype labeltype() const {return (Fl_Labeltype)labeltype_;}
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/**
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Sets the menu item's labeltype.
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A labeltype identifies a routine that draws the label of the
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widget. This can be used for special effects such as emboss, or to use
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the label() pointer as another form of data such as a bitmap.
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The value FL_NORMAL_LABEL prints the label as text.
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*/
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void labeltype(Fl_Labeltype a) {labeltype_ = a;}
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/**
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Gets the menu item's label color.
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This color is passed to the labeltype routine, and is typically the
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color of the label text. This defaults to FL_BLACK. If this
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color is not black fltk will \b not use overlay bitplanes to draw
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the menu - this is so that images put in the menu draw correctly.
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*/
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Fl_Color labelcolor() const {return labelcolor_;}
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/**
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Sets the menu item's label color.
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\see Fl_Color Fl_Menu_Item::labelcolor() const
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*/
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void labelcolor(Fl_Color a) {labelcolor_ = a;}
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/**
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Gets the menu item's label font.
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Fonts are identified by small 8-bit indexes into a table. See the
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enumeration list for predefined fonts. The default value is a
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Helvetica font. The function Fl::set_font() can define new fonts.
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*/
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Fl_Font labelfont() const {return labelfont_;}
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/**
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Sets the menu item's label font.
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Fonts are identified by small 8-bit indexes into a table. See the
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enumeration list for predefined fonts. The default value is a
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Helvetica font. The function Fl::set_font() can define new fonts.
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*/
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void labelfont(Fl_Font a) {labelfont_ = a;}
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/** Gets the label font pixel size/height. */
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Fl_Fontsize labelsize() const {return labelsize_;}
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/** Sets the label font pixel size/height.*/
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void labelsize(Fl_Fontsize a) {labelsize_ = a;}
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/**
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Returns the callback function that is set for the menu item.
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Each item has space for a callback function and an argument for that
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function. Due to back compatibility, the Fl_Menu_Item itself
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is not passed to the callback, instead you have to get it by calling
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((Fl_Menu_*)w)->mvalue() where w is the widget argument.
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*/
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Fl_Callback_p callback() const {return callback_;}
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/**
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Sets the menu item's callback function and userdata() argument.
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\see Fl_Callback_p Fl_MenuItem::callback() const
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*/
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void callback(Fl_Callback* c, void* p) {callback_=c; user_data_=p;}
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/**
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Sets the menu item's callback function.
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This method does not set the userdata() argument.
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\see Fl_Callback_p Fl_MenuItem::callback() const
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*/
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void callback(Fl_Callback* c) {callback_=c;}
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/**
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Sets the menu item's callback function.
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This method does not set the userdata() argument.
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\see Fl_Callback_p Fl_MenuItem::callback() const
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*/
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void callback(Fl_Callback0*c) {callback_=(Fl_Callback*)c;}
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/**
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Sets the menu item's callback function and userdata() argument.
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This method does not set the userdata() argument.
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The argument \p is cast to void* and stored as the userdata()
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for the menu item's callback function.
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\see Fl_Callback_p Fl_MenuItem::callback() const
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*/
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void callback(Fl_Callback1*c, long p=0) {callback_=(Fl_Callback*)c; user_data_=(void*)(fl_intptr_t)p;}
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/**
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Gets the user_data() argument that is sent to the callback function.
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*/
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void* user_data() const {return user_data_;}
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/**
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Sets the user_data() argument that is sent to the callback function.
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*/
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void user_data(void* v) {user_data_ = v;}
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/**
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Gets the user_data() argument that is sent to the callback function.
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For convenience you can also define the callback as taking a long
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argument. This method casts the stored userdata() argument to long
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and returns it as a \e long value.
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*/
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long argument() const {return (long)(fl_intptr_t)user_data_;}
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/**
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Sets the user_data() argument that is sent to the callback function.
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For convenience you can also define the callback as taking a long
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argument. This method casts the given argument \p v to void*
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and stores it in the menu item's userdata() member.
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This may not be portable to some machines.
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*/
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void argument(long v) {user_data_ = (void*)(fl_intptr_t)v;}
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/** Gets what key combination shortcut will trigger the menu item. */
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int shortcut() const {return shortcut_;}
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/**
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Sets exactly what key combination will trigger the menu item. The
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value is a logical 'or' of a key and a set of shift flags, for instance
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FL_ALT+'a' or FL_ALT+FL_F+10 or just 'a'. A value of
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zero disables the shortcut.
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The key can be any value returned by Fl::event_key(), but will usually
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be an ASCII letter. Use a lower-case letter unless you require the shift
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key to be held down.
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The shift flags can be any set of values accepted by Fl::event_state().
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If the bit is on that shift key must be pushed. Meta, Alt, Ctrl,
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and Shift must be off if they are not in the shift flags (zero for the
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other bits indicates a "don't care" setting).
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*/
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void shortcut(int s) {shortcut_ = s;}
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/**
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Returns true if either FL_SUBMENU or FL_SUBMENU_POINTER
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is on in the flags. FL_SUBMENU indicates an embedded submenu
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that goes from the next item through the next one with a NULL
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label(). FL_SUBMENU_POINTER indicates that user_data()
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is a pointer to another menu array.
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*/
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int submenu() const {return flags&(FL_SUBMENU|FL_SUBMENU_POINTER);}
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/**
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Returns true if a checkbox will be drawn next to this item.
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This is true if FL_MENU_TOGGLE or FL_MENU_RADIO is set in the flags.
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*/
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int checkbox() const {return flags&FL_MENU_TOGGLE;}
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/**
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Returns true if this item is a radio item.
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When a radio button is selected all "adjacent" radio buttons are
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turned off. A set of radio items is delimited by an item that has
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radio() false, or by an item with FL_MENU_DIVIDER turned on.
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*/
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int radio() const {return flags&FL_MENU_RADIO;}
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/** Returns the current value of the check or radio item.
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This is zero (0) if the menu item is not checked and
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non-zero otherwise. You should not rely on a particular value,
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only zero or non-zero.
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\note The returned value for a checked menu item as of FLTK 1.3.2
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is FL_MENU_VALUE (4), but may be 1 in a future version.
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*/
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int value() const {return flags&FL_MENU_VALUE;}
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/**
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Turns the check or radio item "on" for the menu item. Note that this
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does not turn off any adjacent radio items like set_only() does.
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*/
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void set() {flags |= FL_MENU_VALUE;}
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/** Turns the check or radio item "off" for the menu item. */
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void clear() {flags &= ~FL_MENU_VALUE;}
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void setonly();
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/** Gets the visibility of an item. */
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int visible() const {return !(flags&FL_MENU_INVISIBLE);}
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/** Makes an item visible in the menu. */
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void show() {flags &= ~FL_MENU_INVISIBLE;}
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/** Hides an item in the menu. */
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void hide() {flags |= FL_MENU_INVISIBLE;}
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/** Gets whether or not the item can be picked. */
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int active() const {return !(flags&FL_MENU_INACTIVE);}
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/** Allows a menu item to be picked. */
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void activate() {flags &= ~FL_MENU_INACTIVE;}
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/**
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Prevents a menu item from being picked. Note that this will also cause
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the menu item to appear grayed-out.
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*/
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void deactivate() {flags |= FL_MENU_INACTIVE;}
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/** Returns non 0 if FL_INACTIVE and FL_INVISIBLE are cleared, 0 otherwise. */
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int activevisible() const {return !(flags & (FL_MENU_INACTIVE|FL_MENU_INVISIBLE));}
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// compatibility for FLUID so it can set the image of a menu item...
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/** compatibility api for FLUID, same as a->label(this) */
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void image(Fl_Image* a) {a->label(this);}
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/** compatibility api for FLUID, same as a.label(this) */
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void image(Fl_Image& a) {a.label(this);}
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// used by menubar:
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int measure(int* h, const Fl_Menu_*) const;
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void draw(int x, int y, int w, int h, const Fl_Menu_*, int t=0) const;
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// popup menus without using an Fl_Menu_ widget:
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const Fl_Menu_Item* popup(
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int X, int Y,
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const char *title = 0,
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const Fl_Menu_Item* picked=0,
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const Fl_Menu_* = 0) const;
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const Fl_Menu_Item* pulldown(
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int X, int Y, int W, int H,
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const Fl_Menu_Item* picked = 0,
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const Fl_Menu_* = 0,
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const Fl_Menu_Item* title = 0,
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int menubar=0) const;
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const Fl_Menu_Item* test_shortcut() const;
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const Fl_Menu_Item* find_shortcut(int *ip=0, const bool require_alt = false) const;
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/**
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Calls the Fl_Menu_Item item's callback, and provides the Fl_Widget argument.
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The callback is called with the stored user_data() as its second argument.
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You must first check that callback() is non-zero before calling this.
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*/
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void do_callback(Fl_Widget* o) const {callback_(o, user_data_);}
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/**
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Calls the Fl_Menu_Item item's callback, and provides the Fl_Widget argument.
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This call overrides the callback's second argument with the given value \p arg.
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You must first check that callback() is non-zero before calling this.
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*/
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void do_callback(Fl_Widget* o,void* arg) const {callback_(o, arg);}
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/**
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Calls the Fl_Menu_Item item's callback, and provides the Fl_Widget argument.
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This call overrides the callback's second argument with the
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given value \p arg. long \p arg is cast to void* when calling
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the callback.
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You must first check that callback() is non-zero before calling this.
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*/
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void do_callback(Fl_Widget* o,long arg) const {callback_(o, (void*)(fl_intptr_t)arg);}
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// back-compatibility, do not use:
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/** back compatibility only \deprecated. */
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int checked() const {return flags&FL_MENU_VALUE;}
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/** back compatibility only \deprecated. */
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void check() {flags |= FL_MENU_VALUE;}
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/** back compatibility only \deprecated. */
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void uncheck() {flags &= ~FL_MENU_VALUE;}
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int insert(int,const char*,int,Fl_Callback*,void* =0, int =0);
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int add(const char*, int shortcut, Fl_Callback*, void* =0, int = 0);
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/** See int add(const char*, int shortcut, Fl_Callback*, void*, int) */
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int add(const char*a, const char* b, Fl_Callback* c,
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void* d = 0, int e = 0) {
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return add(a,fl_old_shortcut(b),c,d,e);}
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int size() const ;
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};
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typedef Fl_Menu_Item Fl_Menu; // back compatibility
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enum { // back-compatibility enum:
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FL_PUP_NONE = 0,
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FL_PUP_GREY = FL_MENU_INACTIVE,
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FL_PUP_GRAY = FL_MENU_INACTIVE,
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FL_MENU_BOX = FL_MENU_TOGGLE,
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FL_PUP_BOX = FL_MENU_TOGGLE,
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FL_MENU_CHECK = FL_MENU_VALUE,
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FL_PUP_CHECK = FL_MENU_VALUE,
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FL_PUP_RADIO = FL_MENU_RADIO,
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FL_PUP_INVISIBLE = FL_MENU_INVISIBLE,
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FL_PUP_SUBMENU = FL_SUBMENU_POINTER
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};
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#endif
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//
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// End of "$Id$".
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//
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