Struct ScrollState 

pub struct ScrollState {
    pub scroll_y: i32,
    pub max_scroll_y: i32,
    pub viewport_height: i32,
    pub content_height: i32,
    pub scroll_x: i32,
    pub max_scroll_x: i32,
    pub viewport_width: i32,
    pub content_width: i32,
}

Viewport scroll state

Fields

scroll_y: i32

Current vertical scroll offset (pixels)

max_scroll_y: i32

Maximum scroll offset (content_height - viewport_height)

viewport_height: i32

Viewport height (pixels)

content_height: i32

Total content height (pixels)

scroll_x: i32

Horizontal scroll offset (pixels)

max_scroll_x: i32

Maximum horizontal scroll

viewport_width: i32

Viewport width

content_width: i32

Total content width

Implementations

impl ScrollState

pub fn new(viewport_width: i32, viewport_height: i32) -> Self

pub fn set_content_size(&mut self, width: i32, height: i32)

Update content dimensions and recalculate max scroll

pub fn set_viewport_size(&mut self, width: i32, height: i32)

Update viewport dimensions

pub fn scroll_by(&mut self, dx: i32, dy: i32)

Scroll by a delta (positive = down/right)

pub fn scroll_to(&mut self, x: i32, y: i32)

Scroll to an absolute position

pub fn ensure_visible_y(&mut self, y: i32, height: i32)

Scroll to make a vertical position visible

pub fn needs_v_scrollbar(&self) -> bool

Whether a vertical scrollbar is needed

pub fn needs_h_scrollbar(&self) -> bool

Whether a horizontal scrollbar is needed

pub fn v_scrollbar_thumb(&self, track_height: i32) -> (i32, i32)

Get scrollbar thumb position and size for vertical scrollbar. Returns (thumb_y, thumb_height) in pixels within the track.

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.