Struct CollapsiblePanelState 

pub struct CollapsiblePanelState {
    pub side: DockSide,
    pub open: bool,
    pub open_t: f32,
    pub size_px: f32,
    pub min_size_px: f32,
    pub max_size_px: f32,
    pub separator_px: f32,
    /* private fields */
}

State for a single side-docked, collapsible panel.

Wrapped in Rc<RefCell<_>> and remembered by the caller; the slide animation is advanced inside CollapsibleSidePanel each frame.

Fields

side: DockSide

open: bool

Logical open/closed flag (drives the animation target).

open_t: f32

Animated openness, 0..1 (1 = fully open). Follows the pointer while an edge drag is in progress.

size_px: f32

Width (Left/Right) or height (Top/Bottom) of the open panel body, in dp.

min_size_px: f32

max_size_px: f32

separator_px: f32

Thickness of the draggable separator edge, in dp.

Implementations

impl CollapsiblePanelState

pub fn new(side: DockSide, size_px: f32) -> Self

pub fn toggle(&mut self)

pub fn visible_body_size(&self) -> f32

Visible body size (excluding the separator), honoring an active drag.

pub fn visible_total(&self) -> f32

Total extent of the panel slot, including the separator hit strip.

pub fn advance(&mut self) -> bool

Advance the slide animation toward the logical open target. Returns true if still animating (caller should request_frame).

pub fn begin_edge_drag(&mut self, pointer_along_axis: f32)

pub fn edge_drag(&mut self, pointer_along_axis: f32)

Update the drag from the current pointer position along the panel axis.

pub fn end_edge_drag(&mut self)

End the drag: snap open/closed. A partially-open pull snaps to the nearest state and animates there on subsequent frames.