Struct ScrollState 

pub struct ScrollState { /* private fields */ }

Scroll state for navigating large datasets

Manages scroll position with bounds checking and page navigation.

Implementations

impl ScrollState

pub fn new(total_rows: usize, visible_rows: usize) -> Self

Create a new scroll state

Arguments

• total_rows - Total number of rows in the dataset
• visible_rows - Number of rows visible in the viewport

pub fn offset(&self) -> usize

Get current scroll offset

pub fn set_offset(&mut self, offset: usize)

Set scroll offset with bounds clamping

pub fn total_rows(&self) -> usize

Get total row count

pub fn set_total_rows(&mut self, total: usize)

Update total row count

pub fn visible_rows(&self) -> usize

Get visible row count

pub fn set_visible_rows(&mut self, visible: usize)

Update visible row count

pub fn selected(&self) -> Option<usize>

Get currently selected row

pub fn set_selected(&mut self, row: Option<usize>)

Set selected row with bounds checking

pub fn select_next(&mut self)

Select the next row

pub fn select_prev(&mut self)

Select the previous row

pub fn scroll_down(&mut self)

Scroll down by one row

pub fn scroll_up(&mut self)

Scroll up by one row

pub fn page_down(&mut self)

Scroll down by one page

pub fn page_up(&mut self)

Scroll up by one page

pub fn home(&mut self)

Jump to the first row

pub fn end(&mut self)

Jump to the last page

pub fn ensure_visible(&mut self, row: usize)

Ensure a specific row is visible

pub fn needs_scrollbar(&self) -> bool

Check if scrolling is needed (content exceeds viewport)

pub fn scrollbar_position(&self) -> f32

Calculate scrollbar position (0.0 to 1.0)

pub fn scrollbar_size(&self) -> f32

Calculate scrollbar size (0.0 to 1.0)

pub fn is_visible(&self, row: usize) -> bool

Check if a row index is currently visible

pub fn to_viewport_row(&self, global_row: usize) -> Option<usize>

Convert a global row index to viewport-relative row

pub fn to_global_row(&self, viewport_row: usize) -> usize

Convert a viewport-relative row to global row index

Trait Implementations

impl Clone for ScrollState

fn clone(&self) -> ScrollState

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ScrollState

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

Formats the value using the given formatter.

impl Default for ScrollState

fn default() -> ScrollState

Returns the “default value” for a type.

impl Copy for ScrollState