Module: ui.widgets.slider

Source: ./ui/widgets/slider.reef

Overview

ui/widgets/slider.reef - Value slider control Part of reef-stdlib UI module

The Slider widget allows users to select a value from a range by dragging a thumb along a track.

Sliders support:

Horizontal and vertical orientations
Configurable min/max range
Step values for discrete selections
Custom colors
Keyboard control

Types

SliderOrientation (enum)

Variants:

Horizontal
Vertical

Objects

Slider

Extends: widget.Widget

Fields:

Name	Type
`value`	`float`
`min_value`	`float`
`max_value`	`float`
`step_value`	`float`
`orientation`	`SliderOrientation`
`focused`	`bool`
`dragging`	`bool`
`custom_track_color`	`core.Color`
`use_custom_track`	`bool`
`custom_thumb_color`	`core.Color`
`use_custom_thumb`	`bool`
`track_height`	`float`
`thumb_size`	`float`

`proc init(id: widget.WidgetId, min: float, max: float)`

Methods:

`override shared fn kind(): string`

`exclusive proc set_value(value: float)`

`exclusive proc set_range(min: float, max: float)`

`exclusive proc set_step(step_value: float)`

`exclusive proc set_orientation(orientation: SliderOrientation)`

`exclusive proc set_enabled(enabled: bool)`

`exclusive proc set_track_color(color: core.Color)`

`exclusive proc set_thumb_color(color: core.Color)`

`exclusive proc set_dragging(dragging: bool)`

`exclusive proc set_focused(focused: bool)`

`shared fn clone(): Slider`

D2 (docs/design/2026-09-08-ui-modernization.md): a SHALLOW copy. Setters mutate the receiver (reef-lang#62), so "give me a variant and leave the original alone" has to be asked for explicitly. Referenced objects are shared, not deep-copied.

`shared fn preferred_size(th: theme.Theme): core.Size`

`exclusive proc layout(constraints: layout.Constraints, th: theme.Theme)`

`override exclusive fn handle_event(e: event.Event): widget.EventResult`

`override exclusive proc paint(surf: surface.Surface, th: theme.Theme)`

Functions

`fn orientation_horizontal(): SliderOrientation`

`fn orientation_vertical(): SliderOrientation`

`fn is_orientation_horizontal(o: SliderOrientation): bool`

`fn is_orientation_vertical(o: SliderOrientation): bool`

`fn slider(min: float, max: float): Slider`

`fn slider_with_value(min: float, max: float, value: float): Slider`

`fn handle_mouse_event(s: Slider, me: event.MouseEvent, bounds: core.Rect): widget.EventResult`

`fn update_value_from_position(s: Slider, x: float, y: float, bounds: core.Rect): Slider`

`fn handle_key_event(s: Slider, ke: event.KeyEvent): widget.EventResult`

`fn handle_focus_event(s: Slider, fe: event.FocusEvent): widget.EventResult`

`fn get_track_color(s: Slider, colors: theme.ThemeColors): core.Color`

`fn get_thumb_color(s: Slider, colors: theme.ThemeColors): core.Color`

`fn get_step_amount(s: Slider): float`

`fn point_in_rect(px: float, py: float, r: core.Rect): bool`

Procedures

`proc paint_horizontal_slider(s: Slider, surf: surface.Surface, bounds: core.Rect, track_color: core.Color, filled_color: core.Color, thumb_color: core.Color, colors: theme.ThemeColors)`

`proc paint_vertical_slider(s: Slider, surf: surface.Surface, bounds: core.Rect, track_color: core.Color, filled_color: core.Color, thumb_color: core.Color, colors: theme.ThemeColors)`

`proc draw_rect_border(surf: surface.Surface, x: float, y: float, w: float, h: float, color: core.Color, width: float)`

Generated by reefc doc