apps/menu.h

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2002 Robert E. Hak
  11  *
  12  * All files in this archive are subject to the GNU General Public License.
  13  * See the file COPYING in the source tree root for full license agreement.
  14  *
  15  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  16  * KIND, either express or implied.
  17  *
  18  ****************************************************************************/
  19
  20 #ifndef __MENU_H__
  21 #define __MENU_H__
  22
  23 #include <stdbool.h>
  24 #include "icon.h"
  25 #include "icons.h"
  26 #include "root_menu.h" /* needed for MENU_* return codes */
  27
  28
  29 enum menu_item_type {
  30     MT_MENU = 0,
  31     MT_SETTING,
  32     MT_SETTING_W_TEXT, /* same as setting, but uses different
  33                           text for the setting title,
  34                           ID2P() or "literal" for the str param */
  35     MT_FUNCTION_CALL, /* call a function from the menus */
  36     MT_RETURN_ID, /* returns the position of the selected item (starting at 0)*/
  37     MT_RETURN_VALUE, /* returns a value associated with an item */
  38 };
  39 #define MENU_TYPE_MASK 0xF /* MT_* type */
  40
  41 typedef int (*menu_function)(void);
  42 struct menu_func {
  43     union {
  44         int (*function_w_param)(void* param); /* intptr_t instead of void*
  45                                                     for 64bit systems */
  46         int (*function)(void);
  47     };
  48     void *param; /* passed to function_w_param */
  49 };
  50
  51 /* these next two are mutually exclusive */
  52 #define MENU_HAS_DESC   0x10
  53 #define MENU_DYNAMIC_DESC 0x20 /* the name of this menu item is set by the  \
  54                                   list_get_name callback */
  55
  56 #define MENU_EXITAFTERTHISMENU 0x40 /* do_menu() will exiting out of any    \
  57                                        menu item with this flag set */
  58
  59 /* Flags for MT_FUNCTION_CALL */
  60 #define MENU_FUNC_USEPARAM 0x80
  61 #define MENU_FUNC_CHECK_RETVAL 0x100
  62
  63 #define MENU_COUNT_MASK 0xFFF
  64 #define MENU_COUNT_SHIFT 12
  65 #define MENU_ITEM_COUNT(c) ((c&MENU_COUNT_MASK)<<MENU_COUNT_SHIFT)
  66 #define MENU_GET_COUNT(flags) ((flags>>MENU_COUNT_SHIFT)&MENU_COUNT_MASK)
  67
  68 struct menu_item_ex {
  69     unsigned int flags; /* above defines */
  70     union {
  71         const struct menu_item_ex **submenus; /* used with MT_MENU */
  72         void *variable; /* used with MT_SETTING,
  73                            must be in the settings_list.c list */
  74         const struct menu_func *function; /* MT_FUNCTION_* */
  75         const char **strings; /* used with MT_RETURN_ID */
  76         int value; /* MT_RETURN_VALUE */
  77     };
  78     union {
  79         /* For settings */
  80         int (*menu_callback)(int action, const struct menu_item_ex *this_item);
  81         /* For everything else, except if the text is dynamic */
  82         const struct menu_callback_with_desc {
  83             int (*menu_callback)(int action,
  84                                  const struct menu_item_ex *this_item);
  85             unsigned char *desc; /* string or ID */
  86             int icon_id; /* from icons_6x8 in icons.h */
  87         } *callback_and_desc;
  88         /* For when the item text is dynamic */
  89         const struct menu_get_name_and_icon {
  90             int (*menu_callback)(int action,
  91                                  const struct menu_item_ex *this_item);
  92             char *(*list_get_name)(int selected_item, void * data, char *buffer);
  93             int (*list_speak_item)(int selected_item, void * data);
  94             void *list_get_name_data;
  95             int icon_id;
  96         } *menu_get_name_and_icon;
  97     };
  98 };
  99
 100 typedef int (*menu_callback_type)(int action,
 101                                   const struct menu_item_ex *this_item);
 102 bool do_setting_from_menu(const struct menu_item_ex *temp);
 103
 104 /*
 105    int do_menu(const struct menu_item_ex *menu, int *start_selected)
 106
 107    Return value - usually one of the GO_TO_* values from root_menu.h,
 108    however, some of the following defines can cause this to
 109    return a different value.
 110
 111    *menu - The menu to run, can be a pointer to a MAKE_MENU() variable,
 112             MENUITEM_STRINGLIST() or MENUITEM_RETURNVALUE() variable.
 113
 114    *start_selected - the item to select when the menu is first run.
 115                      When do_menu() returns, this will be set to the
 116                      index of the selected item at the time of the exit.
 117                      This is always set, even if the menu was cancelled.
 118                      If NULL it is ignored and the firs item starts selected
 119 */
 120 int do_menu(const struct menu_item_ex *menu, int *start_selected,
 121             struct viewport parent[NB_SCREENS], bool hide_bars);
 122
 123 /* In all the following macros the argument names are as follows:
 124     - name: The name for the variable (so it can be used in a MAKE_MENU()
 125     - str:  the string to display for this menu item. use ID2P() for LANG_* id's
 126     - callback: The callback function to call for this menu item.
 127 */
 128
 129 /*  Use this to put a setting into a menu.
 130     The setting must appear in settings_list.c.
 131     If the setting is not configured properly, the menu will display "Not Done yet!"
 132     When the user selects this item the setting select screen will load,
 133     when that screen exits the user wll be back in the menu */
 134 #define MENUITEM_SETTING(name,var,callback)                  \
 135     static const struct menu_item_ex name =                  \
 136         {MT_SETTING, {.variable = (void*)var},{callback}};
 137
 138 /*  Use this for settings which have a differnt title in their
 139     setting screen than in the menu (e.g scroll options */
 140 #define MENUITEM_SETTING_W_TEXT(name, var, str, callback )              \
 141     static const struct menu_callback_with_desc name##__ =              \
 142                 {callback,str, Icon_NOICON};                            \
 143     static const struct menu_item_ex name =                             \
 144         {MT_SETTING_W_TEXT|MENU_HAS_DESC, {.variable = (void*)var },    \
 145             {.callback_and_desc = & name##__}};
 146
 147 /*  Use this To create a list of Strings (or ID2P()'s )
 148     When the user enters this list and selects one, the menu will exit
 149     and do_menu() will return value the index of the chosen item.
 150     if the user cancels, GO_TO_PREVIOUS will be returned */
 151 #define MENUITEM_STRINGLIST(name, str, callback, ... )                  \
 152     static const char *name##_[] = {__VA_ARGS__};                       \
 153     static const struct menu_callback_with_desc name##__ =              \
 154             {callback,str, Icon_NOICON};                                \
 155     static const struct menu_item_ex name =                             \
 156         {MT_RETURN_ID|MENU_HAS_DESC|                                    \
 157          MENU_ITEM_COUNT(sizeof( name##_)/sizeof(*name##_)),            \
 158             { .strings = name##_},{.callback_and_desc = & name##__}};
 159
 160
 161 /* causes do_menu() to return a value associated with the item */
 162 #define MENUITEM_RETURNVALUE(name, str, val, cb, icon)                      \
 163      static const struct menu_callback_with_desc name##_ = {cb,str,icon};   \
 164      static const struct menu_item_ex name   =                              \
 165          { MT_RETURN_VALUE|MENU_HAS_DESC, { .value = val},                  \
 166          {.callback_and_desc = & name##_}};
 167
 168 /* same as above, except the item name is dynamic */
 169 #define MENUITEM_RETURNVALUE_DYNTEXT(name, val, cb, text_callback,          \
 170                                      voice_callback, text_cb_data, icon)    \
 171      static const struct menu_get_name_and_icon name##_                     \
 172          = {cb,text_callback,voice_callback,text_cb_data,icon};             \
 173      static const struct menu_item_ex name   =                              \
 174         { MT_RETURN_VALUE|MENU_DYNAMIC_DESC, { .value = val},               \
 175         {.menu_get_name_and_icon = & name##_}};
 176
 177 /*  Use this to put a function call into the menu.
 178     When the user selects this item the function will be run,
 179     if MENU_FUNC_CHECK_RETVAL is set, the return value
 180     will be checked, returning 1 will exit do_menu();
 181     if MENU_FUNC_USEPARAM is set, param will be passed to the function */
 182 #define MENUITEM_FUNCTION(name, flags, str, func, param,                       \
 183                               callback, icon)                                  \
 184     static const struct menu_callback_with_desc name##_ = {callback,str,icon}; \
 185     static const struct menu_func name##__ = {{(void*)func}, param};           \
 186     /* should be const, but recording_settings wont let us do that */          \
 187     const struct menu_item_ex name   =                                         \
 188         { MT_FUNCTION_CALL|MENU_HAS_DESC|flags,                                \
 189          { .function = & name##__}, {.callback_and_desc = & name##_}};
 190
 191 /* As above, except the text is dynamic */
 192 #define MENUITEM_FUNCTION_DYNTEXT(name, flags, func, param,                 \
 193                                   text_callback, voice_callback,            \
 194                                   text_cb_data, callback, icon)             \
 195     static const struct menu_get_name_and_icon name##_                      \
 196         = {callback,text_callback,voice_callback,text_cb_data,icon};        \
 197     static const struct menu_func name##__ = {{(void*)func}, param};           \
 198     static const struct menu_item_ex name   =                                  \
 199         { MT_FUNCTION_CALL|MENU_DYNAMIC_DESC|flags,                            \
 200          { .function = & name##__}, {.menu_get_name_and_icon = & name##_}};
 201
 202 /*  Use this to actually create a menu. the ... argument is a list of pointers
 203     to any of the above macro'd variables.
 204     (It can also have other menus in the list.) */
 205 #define MAKE_MENU( name, str, callback, icon, ... )                            \
 206     static const struct menu_item_ex *name##_[]  = {__VA_ARGS__};              \
 207     static const struct menu_callback_with_desc name##__ = {callback,str,icon};\
 208     const struct menu_item_ex name =                                           \
 209         {MT_MENU|MENU_HAS_DESC|                                                \
 210          MENU_ITEM_COUNT(sizeof( name##_)/sizeof(*name##_)),                   \
 211             { (void*)name##_},{.callback_and_desc = & name##__}};
 212
 213
 214 #endif /* End __MENU_H__ */