Status-bar 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_status_bar.h:

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Data Structures
struct	ra8_widget_status_bar

Typedefs
typedef struct ra8_widget_status_bar	ra8_widget_status_bar_t

Functions
const ra8_widget_vtable_t *	ra8_widget_status_bar_vtable (void)
	Return the shared vtable backing every status-bar widget.
ra8_err_t	ra8_widget_status_bar_init (ra8_widget_t w, ra8_widget_status_bar_t bar)
	Bind a widget instance to a status bar.

Detailed Description

Status-bar leaf widget for the ra8_widget tree model (#145 Phase 2).

Both e-reader screens open with the same top band: a heading / wordmark hugging the left, a status string (clock, battery) hugging the right, and a hairline rule under the band. ra8_widget_status_bar_t extracts that into a reusable ra8_widget leaf: it fills its rect with bg, draws the left-aligned left text and the right-aligned right text (each vertically centred when the paint backend can measure a string), then paints a rule hairline rule_h pixels tall along its bottom edge. Painting goes through the injected ra8_widget_paint_t backend, so the widget carries no ra8_gfx dependency and is host-testable. It is display-only, so its vtable leaves on_input NULL.

[Ring 5 / UI] {World: NS}

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

Since: 0.1.0

Definition in file ra8_widget_status_bar.h.

Typedef Documentation

◆ ra8_widget_status_bar_t

typedef struct ra8_widget_status_bar ra8_widget_status_bar_t

Function Documentation

◆ ra8_widget_status_bar_init()

ra8_err_t ra8_widget_status_bar_init	(	ra8_widget_t *	w,
		ra8_widget_status_bar_t *	bar )

nodiscard

Bind a widget instance to a status bar.

Wires w to render bar: sets its vtable to ra8_widget_status_bar_vtable, points its ctx at bar, 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 status bar (non-NULL).
[in]	bar	Status-bar descriptor (non-NULL; outlives `w's` use).

Returns: ra8_err_t

Return values

k_ra8_ok	Bound; `w` renders `bar`.
k_ra8_err_null_ptr	`w` or `bar` is NULL.

Precondition: w and bar are non-NULL.; bar outlives every render of w.

Postcondition: On success w->vt == ra8_widget_status_bar_vtable(), w->ctx == bar, w->visible == true.; On failure w is left unchanged.

Note: Not thread-safe.

See also: ra8_widget_status_bar_vtable

Since: 0.1.0

Definition at line 140 of file ra8_widget_status_bar.c.

References k_ra8_ok, RA8_CHECK_NULL_PTR, ra8_widget_status_bar_vtable(), and s_tag.

◆ ra8_widget_status_bar_vtable()

const ra8_widget_vtable_t * ra8_widget_status_bar_vtable ( void )

Return the shared vtable backing every status-bar widget.

One immutable vtable serves all status bars: render fills the background, draws the left + right labels and the bottom hairline through the bar's ra8_widget_paint_t; measure and on_input are NULL (a status bar sizes from its parent's fixed/flex and never consumes input). ra8_widget_status_bar_init binds it, so callers rarely need it directly.

Returns: Non-NULL pointer to the static status-bar 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_status_bar_init

Since: 0.1.0

Definition at line 135 of file ra8_widget_status_bar.c.

References s_sb_vt.

Referenced by ra8_widget_status_bar_init(), and wd_build_tree().

Data Structures