Struct DragDrop 

pub struct DragDrop { /* private fields */ }

The shared drag-and-drop model (DND-1). Tracks where each item currently lives (placement), the in-flight drag (dragging + hover), and the moves committed since the host last drained them.

Implementations

impl DragDrop

pub fn new() -> Self

pub fn place(&mut self, item: impl Into<String>, zone: impl Into<String>)

Declare (or move, non-interactively) an item into a zone — how the host seeds the board from its data, or re-homes an item after rejecting a move.

pub fn zone_of(&self, item: &str) -> Option<&str>

The zone an item currently lives in.

pub fn items_in(&self, zone: &str) -> Vec<&str>

The items currently in a zone (sorted, deterministic).

pub fn dragging(&self) -> Option<&str>

The item being dragged this session, if any.

pub fn hover(&self) -> Option<&str>

The zone under the pointer this session, if any.

pub fn is_dragging(&self) -> bool

Whether a drag is in flight.

pub fn drain_moves(&mut self) -> Vec<Move>

Drain the moves committed since the last call. The host applies each as a transition (mirrors kanban’s take_moves).

pub fn update(&mut self, msg: DragMsg) -> Vec<DragEffect>

The single mutation path (FC-2 / FC-8). Apply one DragMsg; return the DragEffects the host should run (empty = nothing to do).

pub fn state_json(&self) -> Value

Observable state as JSON (the state_json discipline) — placements, the in-flight drag, and undrained moves, so a headless test asserts the board without a display.

Trait Implementations

impl Clone for DragDrop

fn clone(&self) -> DragDrop

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for DragDrop

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

Formats the value using the given formatter.

impl Default for DragDrop

fn default() -> DragDrop

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for DragDrop

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Eq for DragDrop

impl PartialEq for DragDrop

fn eq(&self, other: &DragDrop) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl Serialize for DragDrop

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for DragDrop