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amiga-bootcamp/09_intuition/menus.md
Ilia Sharin 21751c0025 docs(amiga): complete AmigaOS 3.1/3.2 developer reference — 172 files across 17 sections 
Comprehensive technical documentation covering:
- Hardware: OCS/ECS/AGA custom chip registers, Copper & Blitter deep dives
- Boot sequence: cold boot through startup-sequence
- Binary format: HUNK executable spec, relocation, debug info
- Linking & ABI: .fd files, LVO tables, register calling conventions
- Exec kernel: tasks, interrupts, memory, signals, semaphores
- AmigaDOS: file I/O, FFS/OFS layout, CLI/Shell scripting
- Graphics: planar bitmaps, Copper programming, HAM/EHB modes
- Intuition: screens, windows, IDCMP, BOOPSI
- Devices: trackdisk, SCSI, serial, timer, audio, keyboard
- Libraries: utility, expansion, IFFParse, locale, ARexx
- Networking: bsdsocket API, SANA-II, TCP/IP stack comparison
- Toolchain: GCC, vasm/vlink, SAS/C, NDK, debugging
- Reverse engineering: IDA/Ghidra setup, compiler fingerprints, case studies
- CPU & MMU: 68040/060 emulation libs, PMMU, cache management
- Driver development: SANA-II, Picasso96/RTG, AHI audio

All files include breadcrumb navigation. No local paths or proprietary content.
2026-04-23 12:17:35 -04:00

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← Home · Intuition

Menus — MenuStrip Construction

Overview

Intuition menus are structured as: Menu → MenuItem → SubItem. Menus are attached to windows and appear when the user presses the right mouse button.

GadTools Menu Creation (OS 2.0+)

struct NewMenu nm[] = {
    { NM_TITLE,  "Project",   NULL, 0, 0, NULL },
    {  NM_ITEM,  "New",       "N",  0, 0, NULL },
    {  NM_ITEM,  "Open...",   "O",  0, 0, NULL },
    {  NM_ITEM,  NM_BARLABEL, NULL, 0, 0, NULL },  /* separator */
    {  NM_ITEM,  "Quit",      "Q",  0, 0, NULL },
    { NM_TITLE,  "Edit",      NULL, 0, 0, NULL },
    {  NM_ITEM,  "Cut",       "X",  0, 0, NULL },
    {  NM_ITEM,  "Copy",      "C",  0, 0, NULL },
    {  NM_ITEM,  "Paste",     "V",  0, 0, NULL },
    { NM_END,    NULL,        NULL, 0, 0, NULL }
};

struct Menu *menu = CreateMenus(nm, TAG_DONE);
LayoutMenus(menu, vi, TAG_DONE);
SetMenuStrip(win, menu);

/* In event loop on IDCMP_MENUPICK: */
UWORD code = imsg->Code;
while (code != MENUNULL) {
    struct MenuItem *item = ItemAddress(menu, code);
    UWORD menuNum  = MENUNUM(code);
    UWORD itemNum  = ITEMNUM(code);
    UWORD subNum   = SUBNUM(code);
    /* process selection */
    code = item->NextSelect;
}

/* Cleanup: */
ClearMenuStrip(win);
FreeMenus(menu);

Menu Selection Macros

#define MENUNUM(code)   ((code) & 0x1F)        /* menu number (0–31) */
#define ITEMNUM(code)   (((code) >> 5) & 0x3F)  /* item number (0–63) */
#define SUBNUM(code)    (((code) >> 11) & 0x1F)  /* subitem number */
#define FULLMENUNUM(m,i,s) ((m)|((i)<<5)|((s)<<11))
#define MENUNULL        0xFFFF                   /* no selection */

References

  • NDK39: libraries/gadtools.h, intuition/intuition.h
  • ADCD 2.1: CreateMenus, LayoutMenus, SetMenuStrip