GestureRecognizer class abstract

Abstract base class for all gesture recognizers.

A recognizer receives pointer events and decides whether the sequence matches its gesture. It participates in a GestureArenaManager to resolve conflicts with other recognizers.

Recognizer callbacks return Cmd? to fit the TEA architecture. The pendingCmds list collects all commands produced during a pointer event so the owning widget can batch them.

Constructors

GestureRecognizer()

Properties

hashCode → int

The hash code for this object.

no setter, inherited

initialPosition ↔ Offset?

Position where the pointer first went down.

getter/setter pair

pendingCmds → List<Cmd>

Commands accumulated from callbacks during the current event.

final

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

state ↔ GestureRecognizerState

Current lifecycle state.

getter/setter pair

Methods

acceptGesture() → void

Called when this recognizer wins the arena.

addCmd(Cmd? cmd) → void

Adds a command to pendingCmds if non-null.

dispose() → void

Cleans up resources. Called when the recognizer is no longer needed.

handlePointerDown(MouseMsg event, Offset localPosition) → void

Called when a pointer-down event occurs.

handlePointerMove(MouseMsg event, Offset localPosition) → void

Called when a pointer-move event occurs.

handlePointerUp(MouseMsg event, Offset localPosition) → void

Called when a pointer-up event occurs.

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

rejectGesture() → void

Called when this recognizer loses the arena.

reset() → void

Resets the recognizer to GestureRecognizerState.ready.

resolve(GestureDisposition disposition) → void

Requests acceptance or rejection from the arena.

toString() → String

A string representation of this object.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited