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95 lines
2.8 KiB
Markdown
95 lines
2.8 KiB
Markdown
% notcurses_menu(3)
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% nick black <nickblack@linux.com>
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% v1.4.3
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# NAME
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notcurses_menu - operations on menus
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# SYNOPSIS
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**#include <notcurses/notcurses.h>**
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```c
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struct ncmenu;
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struct ncplane;
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struct ncinput;
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struct notcurses;
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struct ncmenu_section {
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char* name; // utf-8 c string
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struct ncmenu_item {
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char* desc; // utf-8 menu item, NULL for horizontal separator
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ncinput shortcut; // shortcut, all should be distinct
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}* items;
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int itemcount;
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};
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#define NCMENU_OPTION_BOTTOM 0x0001 // bottom row (as opposed to top row)
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#define NCMENU_OPTION_HIDING 0x0002 // hide the menu when not being used
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typedef struct ncmenu_options {
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struct ncmenu_section* sections; // 'sectioncount' menu_sections
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int sectioncount; // must be positive
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uint64_t headerchannels; // styling for header
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uint64_t sectionchannels; // styling for sections
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unsigned flags; // bitfield on NCMENU_OPTION_*
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} ncmenu_options;
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```
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**struct ncmenu* ncmenu_create(struct notcurses* nc, const menu_options* opts);**
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**int ncmenu_unroll(struct ncmenu* n, int sectionidx);**
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**int ncmenu_rollup(struct ncmenu* n);**
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**int ncmenu_nextsection(struct ncmenu* n);**
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**int ncmenu_prevsection(struct ncmenu* n);**
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**int ncmenu_nextitem(struct ncmenu* n);**
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**int ncmenu_previtem(struct ncmenu* n);**
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**const char* ncmenu_selected(const struct ncmenu* n, struct ncinput* ni);**
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**struct ncplane* ncmenu_plane(struct ncmenu* n);**
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**bool ncmenu_offer_input(struct ncmenu* n, const struct ncinput* nc);**
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**int ncmenu_destroy(struct ncmenu* n);**
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# DESCRIPTION
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A notcurses instance supports menu bars on the top or bottom row of the true
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screen. A menu is composed of sections, which are in turn composed of items.
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Either no sections are visible, and the menu is *rolled up*, or exactly one
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section is *unrolled*. **ncmenu_rollup** places an ncmenu in the rolled up
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state. **ncmenu_unroll** rolls up any unrolled section, and unrolls the
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specified one. **ncmenu_destroy** removes a menu bar, and frees all associated
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resources.
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**ncmenu_selected** return the selected item description, or NULL if no section
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is unrolled.
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The menu can be driven either entirely by the application, via direct calls to
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**ncmenu_previtem**, **ncmenu_prevsection**, and the like, or **struct ncinput**
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objects can be handed to **ncmenu_offer_input**. In the latter case, the menu
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will largely manage itself.
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# RETURN VALUES
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**ncmenu_create** returns **NULL** on error, or a pointer to a valid new ncmenu.
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Other functions return non-zero on error, or zero on success. Almost all errors
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are due to invalid parameters.
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**ncmenu_offer_input** returns **true** if the menu "consumed" the input, i.e.
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found it relevant and took an action. Otherwise, **false** is returned, and the
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**struct ncinput** should be considered irrelevant to the menu.
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# SEE ALSO
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**notcurses(3)**,
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**notcurses_input(3)**,
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**notcurses_plane(3)**
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