Struct DoubleAxisScrollElementManager 

pub struct DoubleAxisScrollElementManager { /* private fields */ }

Per-element two-axis scroll manager with wheel, optional drag, and clamping.

Combines wheel deltas from FullElementScrollState::get_mouse_wheel_move_v with optional mouse-drag scrolling when button is Some. Drag delta is current_mouse_pos − previous_mouse_pos; no delta is produced on the first frame the button is held.

When the parent element is hovered but not yet pressed, hover on any child_elements suppresses parent drag capture so children receive priority.

Scroll position is clamped to [−limits, 0] per axis after each update.

Implementations

impl DoubleAxisScrollElementManager

pub fn new( algorithms: [ScrollAlgorithm; 2], id: ElementId, child_elements: Vec<ElementId>, button: Option<MouseButton>, ) -> Self

Creates a scroll manager for id.

• algorithms — per-axis scroll algorithms; index 0 horizontal, 1 vertical.
• child_elements — child IDs that take hover priority over parent drag.
• button — mouse button for drag scrolling; None disables drag.

pub fn update(&mut self, provider: &dyn FullElementScrollState, dt: f32)

Advances scroll state for one frame.

No-op when layout bounds or internal size are unavailable for id.

pub fn get_position(&self) -> Vector2

Returns the current clamped scroll offset.