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96 lines
3.3 KiB
Markdown
96 lines
3.3 KiB
Markdown
% notcurses_tree(3)
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% nick black <nickblack@linux.com>
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% v2.3.4
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# NAME
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notcurses_tree - high-level hierarchical line-based data
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# SYNOPSIS
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**#include <notcurses/notcurses.h>**
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```c
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struct nctree;
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struct ncplane;
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typedef struct nctree_item {
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void* curry;
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struct nctree_item* subs;
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unsigned subcount;
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} nctree_item;
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typedef struct nctree_options {
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const nctree_item* items; // top-level nctree_item array
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unsigned count; // size of |items|
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int (*nctreecb)(struct ncplane*, void*, int); // item callback
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int indentcols; // columns to indent per hierarchy
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uint64_t flags; // bitfield of NCTREE_OPTION_*
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} nctree_options;
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```
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**struct nctree* nctree_create(struct ncplane* ***n***, const nctree_options* ***opts***);**
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**struct ncplane* nctree_plane(struct nctree* ***n***);**
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**int nctree_redraw(struct nctree* ***n***);**
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**bool nctree_offer_input(struct nctree* ***n***, const ncinput* ***ni***);**
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**void* nctree_focused(struct nctree* ***n***);**
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**void* nctree_next(struct nctree* ***n***);**
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**void* nctree_prev(struct nctree* ***n***);**
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**void* nctree_goto(struct nctree* ***n***, const int* ***spec***, size_t ***specdepth***, int* ***failspec***);**
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**void nctree_destroy(struct nctree* ***n***);**
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# DESCRIPTION
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**nctree**s organize static hierarchical items, and allow them to be browsed.
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Each item can have arbitrary subitems. Items can be collapsed and expanded.
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The display supports scrolling and searching. Items cannot be added or removed,
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however; they must be provided in their entirety at creation time.
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An **nctree** cannot be empty. **count** must be non-zero, and **items** must
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not be **NULL**. The callback function **nctreecb** must also be non-**NULL**.
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The callback function **nctreecb** is called on tree items when the tree is
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redrawn. It will be called on each visible item, and any item which has become
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hidden. If the item is newly hidden, the **ncplane** argument will be **NULL**.
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If the item is newly visible, the **ncplane** argument will be an empty plane.
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If the item was already visible, the **ncplane** argument will be the same
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plane passed before. If the item has not changed since the last time the
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callback was invoked, there is no need to change the plane, and the callback
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can return immediately. Otherwise, the plane ought be drawn by the callback.
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Any unused rows ought be trimmed away using **ncplane_resize**. If the plane
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is expanded in the callback, it will be shrunk back down by the widget. The
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**int** parameter indicates distance from the focused item. If the parameter
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is negative, the item is before the focused item; a positive parameter implies
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that the item follows the focused item; the focused item itself is passed zero.
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# RETURN VALUES
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**nctree_create** returns **NULL** for invalid options. This includes a **NULL**
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**items** or **nctreecb** field, or a zero **count** field.
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**nctree_next** and **nctree_prev** both return the **curry** pointer from the
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newly-focused item. **nctree_focused** returns the **curry** pointer from the
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already-focused item.
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# NOTES
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**nctree** shares many properties with **notcurses_reel**. Unlike the latter,
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**nctree**s support arbitrary hierarchical levels, but they do not allow
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elements to come and go across the lifetime of the widget.
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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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**notcurses_reel(3)**
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