Struct DragState 

pub struct DragState { /* private fields */ }

State for tracking a popup drag operation.

Encapsulates the begin/drag/end lifecycle and clamps the new position so the popup keeps at least MIN_VISIBLE_W columns and MIN_VISIBLE_H rows on-screen (the widget’s resolve_rect further shrinks the popup to fit fully within the area).

Also tracks whether the user has ever dragged from the border. Once a border drag is detected, the header area becomes draggable too (progressive disclosure).

Implementations

impl DragState

pub fn new() -> Self

pub fn begin( &mut self, popup: Rect, col: u16, row: u16, on_border: bool, in_drag_area: bool, )

Start a drag if in_drag_area is true.

• on_border — whether the click was on the border (not the header). Only border clicks enable header drag for later interactions.
• in_drag_area — whether the click is inside any drag zone (border or header, depending on header_drag_enabled()).

pub fn header_drag_enabled(&self) -> bool

Whether the header area is draggable.

Returns true once the user has dragged from the border at least once during this session.

pub fn update(&self, area: Rect, col: u16, row: u16) -> Option<(u16, u16)>

Update the drag and return the new popup origin (x, y). Returns None if no drag is in progress.

The origin is clamped so at least MIN_VISIBLE_W columns and MIN_VISIBLE_H rows of the popup always remain on-screen.

pub fn end(&mut self)

End the drag (called on mouse up).

pub fn is_dragging(&self) -> bool

Whether a drag is in progress.

Trait Implementations

impl Default for DragState

fn default() -> DragState

Returns the “default value” for a type.