ScaleBackdropTransform class

The default BackdropTransform: scales the backdrop down from 1.0 to minScale as the sheet opens, and (for the root layer) clips its corners with an animated radius.

This reproduces the classic drawer "zoom-out" effect where the underlying content shrinks slightly to reveal the drawer sliding in from the edge.

Inheritance

Constructors

ScaleBackdropTransform({double minScale = kBackdropScaleDown, double? cornerRadius})
Creates a scaling backdrop transform.
const

Properties

cornerRadius → double?
The corner radius the root backdrop clips to when fully open. When null, Theme.of(context).radiusXxl is used.
final
hashCode → int
The hash code for this object.
no setterinherited
minScale → double
The scale applied to the backdrop when fully open. Defaults to kBackdropScaleDown (0.95).
final
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited

Methods

noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
resolveExtraSize(Size size, double t, {bool isRoot = true}) → Size
The amount of space (per axis) freed by this transform for a backdrop of size at progress t. Returns Size.zero when nothing is freed.
override
scaleAt(double t) → double
The scale factor at progress t (1.0 at t=0, minScale at t=1).
toString() → String
A string representation of this object.
inherited
wrapBackdrop(BuildContext context, Widget child, double t, {bool isRoot = true}) → Widget
Wraps child (the backdrop content) with the visual transform for progress t (0 = closed, 1 = fully open).
override

Operators

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