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65 lines
1.8 KiB
Markdown
65 lines
1.8 KiB
Markdown
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[← Home](../README.md) · [Intuition](README.md)
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# Menus — MenuStrip Construction
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## Overview
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Intuition menus are structured as: `Menu` → `MenuItem` → `SubItem`. Menus are attached to windows and appear when the user presses the right mouse button.
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---
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## GadTools Menu Creation (OS 2.0+)
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```c
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struct NewMenu nm[] = {
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{ NM_TITLE, "Project", NULL, 0, 0, NULL },
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{ NM_ITEM, "New", "N", 0, 0, NULL },
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{ NM_ITEM, "Open...", "O", 0, 0, NULL },
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{ NM_ITEM, NM_BARLABEL, NULL, 0, 0, NULL }, /* separator */
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{ NM_ITEM, "Quit", "Q", 0, 0, NULL },
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{ NM_TITLE, "Edit", NULL, 0, 0, NULL },
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{ NM_ITEM, "Cut", "X", 0, 0, NULL },
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{ NM_ITEM, "Copy", "C", 0, 0, NULL },
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{ NM_ITEM, "Paste", "V", 0, 0, NULL },
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{ NM_END, NULL, NULL, 0, 0, NULL }
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};
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struct Menu *menu = CreateMenus(nm, TAG_DONE);
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LayoutMenus(menu, vi, TAG_DONE);
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SetMenuStrip(win, menu);
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/* In event loop on IDCMP_MENUPICK: */
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UWORD code = imsg->Code;
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while (code != MENUNULL) {
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struct MenuItem *item = ItemAddress(menu, code);
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UWORD menuNum = MENUNUM(code);
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UWORD itemNum = ITEMNUM(code);
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UWORD subNum = SUBNUM(code);
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/* process selection */
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code = item->NextSelect;
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}
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/* Cleanup: */
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ClearMenuStrip(win);
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FreeMenus(menu);
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```
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---
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## Menu Selection Macros
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```c
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#define MENUNUM(code) ((code) & 0x1F) /* menu number (0–31) */
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#define ITEMNUM(code) (((code) >> 5) & 0x3F) /* item number (0–63) */
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#define SUBNUM(code) (((code) >> 11) & 0x1F) /* subitem number */
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#define FULLMENUNUM(m,i,s) ((m)|((i)<<5)|((s)<<11))
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#define MENUNULL 0xFFFF /* no selection */
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```
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---
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## References
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- NDK39: `libraries/gadtools.h`, `intuition/intuition.h`
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- ADCD 2.1: `CreateMenus`, `LayoutMenus`, `SetMenuStrip`
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