Struct VerticalScrollbar 

pub struct VerticalScrollbar {
    pub parent_id: String,
    /* private fields */
}

Vertical Scrollbar Component

Extracted from existing static content scrollbar implementation (F0356) Provides unified vertical scrollbar functionality with:

• Context awareness of parent box
• Automatic visibility detection
• Proportional knob sizing
• Click-to-jump and drag-to-scroll support
• Transparent behavior matching existing implementation

Fields

parent_id: String

Parent muxbox ID for context awareness

Implementations

impl VerticalScrollbar

pub fn new(parent_id: String) -> Self

Create new vertical scrollbar component for a parent muxbox

pub fn should_draw(&self, content_height: usize, viewable_height: usize) -> bool

Determine if scrollbar should be visible based on content dimensions

pub fn get_bounds(&self, parent_bounds: &Bounds) -> (usize, usize, usize)

Get the bounds where this scrollbar should be drawn

pub fn calculate_knob_metrics( &self, content_height: usize, viewable_height: usize, vertical_scroll: f64, track_height: usize, ) -> (usize, usize)

Calculate knob position and size using ScrollDimensions (eliminates ad-hoc math)

pub fn draw( &self, parent_bounds: &Bounds, content_height: usize, viewable_height: usize, vertical_scroll: f64, border_color: &Option<String>, bg_color: &Option<String>, buffer: &mut ScreenBuffer, )

Draw the complete vertical scrollbar (track + knob) This is extracted directly from the existing draw_vertical_scrollbar function

pub fn is_click_on_scrollbar( &self, click_x: usize, click_y: usize, parent_bounds: &Bounds, ) -> bool

Check if a click position is on this scrollbar

pub fn is_click_on_knob( &self, click_x: usize, click_y: usize, parent_bounds: &Bounds, content_height: usize, viewable_height: usize, vertical_scroll: f64, ) -> bool

Check if a click position is specifically on the scrollbar knob

pub fn click_position_to_scroll_percentage( &self, click_y: usize, parent_bounds: &Bounds, ) -> f64

Convert click position to scroll percentage

pub fn drag_to_scroll_percentage( &self, start_y: u16, current_y: u16, start_scroll_percentage: f64, parent_bounds: &Bounds, ) -> f64

Calculate new scroll percentage based on drag movement

Trait Implementations

impl Clone for VerticalScrollbar

fn clone(&self) -> VerticalScrollbar

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for VerticalScrollbar

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.