Struct DragState 

pub struct DragState {
    pub source_id: WidgetId,
    pub payload: DragPayload,
    pub start_pos: Position,
    pub current_pos: Position,
    pub preview: Option<Box<dyn Widget>>,
}

Active drag operation state.

Created when a drag starts and destroyed when it ends or is cancelled. The drag manager (bd-1csc.3) owns this state.

Fields

source_id: WidgetId

Widget that initiated the drag.

payload: DragPayload

Data being dragged.

start_pos: Position

Position where the drag started.

current_pos: Position

Current drag position.

preview: Option<Box<dyn Widget>>

Optional custom preview widget.

Implementations

impl DragState

pub fn new( source_id: WidgetId, payload: DragPayload, start_pos: Position, ) -> Self

Create a new drag state.

pub fn with_preview(self, preview: Box<dyn Widget>) -> Self

Set a custom preview widget.

pub fn update_position(&mut self, pos: Position)

Update the current position during a drag move.

pub fn distance(&self) -> u32

Manhattan distance from start to current position.

pub fn delta(&self) -> (i32, i32)

Delta from start to current position as (dx, dy).

Trait Implementations

impl Debug for DragState

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

Formats the value using the given formatter.