Navigation-strip leaf widget for the ra8_widget tree model (#145 Phase 2). More...

#include <stdint.h>
#include "ra8_err.h"
#include "ra8_widget.h"

Include dependency graph for ra8_widget_nav_bar.h:

This graph shows which files directly or indirectly include this file:

Data Structures
struct	ra8_widget_nav_bar

Typedefs
typedef struct ra8_widget_nav_bar	ra8_widget_nav_bar_t

Functions
const ra8_widget_vtable_t *	ra8_widget_nav_bar_vtable (void)
	Return the shared vtable backing every navigation-strip widget.
ra8_err_t	ra8_widget_nav_bar_init (ra8_widget_t w, ra8_widget_nav_bar_t nav)
	Bind a widget instance to a navigation strip.

Detailed Description

Navigation-strip leaf widget for the ra8_widget tree model (#145 Phase 2).

The e-reader Library screen ends in a bottom navigation strip: a row of equal destinations (Library / Store / Settings ...) with the active one inked and the rest muted, each a tap target. ra8_widget_nav_bar_t extracts that into a reusable ra8_widget leaf. render fills the strip and centres each item's label in its equal-width cell (active vs muted colour) through the injected ra8_widget_paint_t backend, so the widget carries no ra8_gfx dependency. on_input maps a touch to the cell it landed in, records it in selected, and fires the optional on_select callback; a button event is declined.

[Ring 5 / UI] {World: NS}

Copyright: Copyright (c) 2026 Brighton Sikarskie SPDX-License-Identifier: MIT

Since: 0.1.0

Definition in file ra8_widget_nav_bar.h.

Typedef Documentation

◆ ra8_widget_nav_bar_t

typedef struct ra8_widget_nav_bar ra8_widget_nav_bar_t

Function Documentation

◆ ra8_widget_nav_bar_init()

ra8_err_t ra8_widget_nav_bar_init	(	ra8_widget_t *	w,
		ra8_widget_nav_bar_t *	nav )

nodiscard

Bind a widget instance to a navigation strip.

Wires w to render + route nav: sets its vtable to ra8_widget_nav_bar_vtable, points its ctx at nav, and makes it visible. The caller still sets w's fixed / flex for its parent's layout.

Parameters

[in,out]	w	Widget to turn into a nav strip (non-NULL).
[in]	nav	Nav-strip descriptor (non-NULL; outlives `w's` use).

Returns: ra8_err_t

Return values

k_ra8_ok	Bound; `w` renders + routes `nav`.
k_ra8_err_null_ptr	`w` or `nav` is NULL.

Precondition: w and nav are non-NULL.; nav outlives every render / dispatch of w.

Postcondition: On success w->vt == ra8_widget_nav_bar_vtable(), w->ctx == nav, w->visible == true.; On failure w is left unchanged.

Note: Not thread-safe.

See also: ra8_widget_nav_bar_vtable

Since: 0.1.0

Definition at line 231 of file ra8_widget_nav_bar.c.

References k_ra8_ok, RA8_CHECK_NULL_PTR, ra8_widget_nav_bar_vtable(), and s_tag.

◆ ra8_widget_nav_bar_vtable()

const ra8_widget_vtable_t * ra8_widget_nav_bar_vtable ( void )

Return the shared vtable backing every navigation-strip widget.

One immutable vtable serves all nav strips: render fills the strip and centres each label in its cell through the strip's ra8_widget_paint_t; on_input maps a touch to a cell and fires on_select; measure is NULL. ra8_widget_nav_bar_init binds it.

Returns: Non-NULL pointer to the static nav-strip vtable.

Precondition: None.; None.

Postcondition: The returned pointer is non-NULL and references static storage.; No state is modified.

Note: Pure; thread-safe (returns a pointer to immutable static data).

See also: ra8_widget_nav_bar_init

Since: 0.1.0

Definition at line 226 of file ra8_widget_nav_bar.c.

References s_nav_vt.

Referenced by ra8_widget_nav_bar_init(), and wd_build_tree().

Data Structures