PinchDepthRecognizer class

Converts a two-finger pinch gesture into a Z-depth (zoom) delta.

Pinching in (fingers approaching) decreases depth — moves the object away. Pinching out (fingers spreading) increases depth — brings the object closer.

Usage

final pinch = PinchDepthRecognizer(
  onDepthChanged: (delta) {
    setState(() => _z += delta);
  },
);

GestureDetector(
  onScaleStart:  pinch.onScaleStart,
  onScaleUpdate: pinch.onScaleUpdate,
  onScaleEnd:    pinch.onScaleEnd,
  child: MyWidget(),
)

Constructors

PinchDepthRecognizer({required void onDepthChanged(double depthDelta), double depthPerUnit = 200, double threshold = 0.005})

Properties

depthPerUnit → double
Multiplier: how many logical pixels to move per unit of scale change.
final
hashCode → int
The hash code for this object.
no setterinherited
onDepthChanged → void Function(double depthDelta)
Called with the Z-depth delta each scale update.
final
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
threshold → double
Minimum scale ratio — rejects micro-changes to avoid jitter.
final

Methods

noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
onScaleEnd(ScaleEndDetails _) → void
onScaleStart(ScaleStartDetails _) → void
onScaleUpdate(ScaleUpdateDetails d) → void
toString() → String
A string representation of this object.
inherited

Operators

operator ==(Object other) → bool
The equality operator.
inherited