Module: reefvision.widgets.scrollbar

Source: ./reefvision/widgets/scrollbar.reef

Overview

reefvision.widgets.scrollbar — thumb math + frame-integrated scroll gutter

object Scrollbar extends view.View. ListBox paints it by composition (a field, not a Group child).

Frame-integrated look (owner design): the vertical window border opens into an empty gutter for the thumb: top cap ┴ / ╩ (scroll_top) mid empty (no │/║ rail) + █ thumb bottom cap ┬ / ╦ (scroll_bot) Caps and thumb use theme.scrollbar style.

Pure helpers (thumb / offset_from_y / paint) stay as module functions — TextArea still calls scrollbar_offset_from_y until Task 11.

Types

ScrollSide (enum)

Variants:

• Right
• Left

Objects

Scrollbar

Extends: view.View

Fields:

proc init(bounds: cell.Rect, content_len: int, view_len: int, offset: int)

Methods:

exclusive proc configure(bounds: cell.Rect, content_len: int, view_len: int, offset: int)

override exclusive proc draw(buf: cell.CellBuffer, abs: cell.Rect, clip: cell.Rect, focused: bool, th: theme.Theme)

exclusive proc draw_frame(buf: cell.CellBuffer, abs: cell.Rect, bx: theme.BoxGlyphs, st_frame: cell.Style, st_thumb: cell.Style)

shared fn offset_from_y(y_on_track: int): int

Functions

fn scroll_side_right(): ScrollSide

fn scroll_side_left(): ScrollSide

fn scroll_side_is_right(s: ScrollSide): bool

fn scrollbar_offset_from_y(content_len: int, view_len: int, track_h: int, y_on_track: int): int

Procedures

proc scrollbar_thumb(content_len: int, view_len: int, offset: int, track_h: int, out_start: [int], out_size: [int])

proc draw_scrollbar(buf: cell.CellBuffer, x: int, y: int, track_h: int, content_len: int, view_len: int, offset: int, st: cell.Style)

proc draw_frame_scrollbar(buf: cell.CellBuffer, x: int, y: int, track_h: int, content_len: int, view_len: int, offset: int, bx: theme.BoxGlyphs, st_frame: cell.Style, st_thumb: cell.Style)

Frame gutter: no rail — top ┴, empty, █ thumb, empty, bottom ┬. Caps share the frame style so they flow with the rest of the border.

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