PanPhysics class Null safety

Base class for handling pan events and translating them to travelled distances.

Implementations should react to pan events by implementing handlePanStart, handlePanUpdate and handlePanEnd and update the value with a corresponding PanState.

Since this is a subclass of ValueNotifier, listeners will be notified, when a new value is set.





curve Curve
The type of curve to use for easing the animation when returning PanState.distance to zero. [...]
duration Duration
The animation duration used for returning a PanState.distance to zero. [...]
hashCode int
The hash code for this object. [...]
read-only, inherited
hasListeners bool
Whether any listeners are currently registered. [...]
@protected, read-only, inherited
runtimeType Type
A representation of the runtime type of the object.
read-only, inherited
size Size
The size of the area to be panned. [...]
read / write
value PanState
The current value stored in this notifier. [...]
read / write, inherited


addListener(VoidCallback listener) → void
Register a closure to be called when the object changes. [...]
dispose() → void
Discards any resources used by the object. After this is called, the object is not in a usable state and should be discarded (calls to addListener and removeListener will throw after the object is disposed). [...]
@mustCallSuper, inherited
handlePanEnd(DragEndDetails details) → void
Is called when the end of a pan gesture is detected. [...]
handlePanStart(DragStartDetails details) → void
Is called when the start of a pan gesture is detected. [...]
handlePanUpdate(DragUpdateDetails details) → void
Is called when a pan gesture is updated. [...]
noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent method or property is accessed. [...]
notifyListeners() → void
Call all the registered listeners. [...]
removeListener(VoidCallback listener) → void
Remove a previously registered closure from the list of closures that are notified when the object changes. [...]
toString() String
A string representation of this object. [...]


operator ==(Object other) bool
The equality operator. [...]


kDefaultCurve → const Curve
The default curve for pan distances to return to zero.
kDefaultDuration → const Duration
The default duration for pan distances to return to zero.
const Duration(milliseconds: 300)