TouchScaleResolver class abstract

An abstract class that defines how the scale value should be calculated during a touch-based scaling interaction.

Implementers

• PercentTouchScaleResolver
• PixelsTouchScaleResolver
• StevensTouchScaleResolver

Constructors

TouchScaleResolver()

const

TouchScaleResolver.percent()

Creates a resolver that always returns the given scale factor.

const

factory

TouchScaleResolver.pixels()

Creates a resolver from a pixel-based offset from the widget center.

const

factory

TouchScaleResolver.stevens({double exponent, double referenceSize, double scalingFactor})

Stevens' Power Law: Perceived intensity = k * (stimulus intensity)^n. For touch feedback, exponent n ~= 0.3-0.5 is appropriate.

const

factory

Properties

hashCode → int

The hash code for this object.

no setter, inherited

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

toString() → String

A string representation of this object.

inherited

transform(Size size, double value) → double

Calculates the scale to apply based on the intrinsic widget size.

Operators

operator ==(Object other) → bool

The equality operator.

inherited