Transform class Null safety

A widget that applies a transformation before painting its child.

Unlike RotatedBox, which applies a rotation prior to layout, this object applies its transformation just prior to painting, which means the transformation is not taken into account when calculating how much space this widget's child (and thus this widget) consumes.

This example rotates and skews an orange box containing text, keeping the top right corner pinned to its original position.
Container(
  color: Colors.black,
  child: Transform(
    alignment: Alignment.topRight,
    transform: Matrix4.skewY(0.3)..rotateZ(-math.pi / 12.0),
    child: Container(
      padding: const EdgeInsets.all(8.0),
      color: const Color(0xFFE8581C),
      child: const Text('Apartment for rent!'),
    ),
  ),
)

See also:

Inheritance

Constructors

Transform({Key? key, required Matrix4 transform, Offset? origin, AlignmentGeometry? alignment, bool transformHitTests, FilterQuality? filterQuality, Widget? child})
Creates a widget that transforms its child. [...]
const
Transform.rotate({Key? key, required double angle, Offset? origin, AlignmentGeometry? alignment, bool transformHitTests, FilterQuality? filterQuality, Widget? child})
Creates a widget that transforms its child using a rotation around the center. [...]
Transform.scale({Key? key, required double scale, Offset? origin, AlignmentGeometry? alignment, bool transformHitTests, FilterQuality? filterQuality, Widget? child})
Creates a widget that scales its child uniformly. [...]
Transform.translate({Key? key, required Offset offset, bool transformHitTests, FilterQuality? filterQuality, Widget? child})
Creates a widget that transforms its child using a translation. [...]

Properties

alignment AlignmentGeometry?
The alignment of the origin, relative to the size of the box. [...]
final
child Widget?
The widget below this widget in the tree. [...]
final, inherited
filterQuality FilterQuality?
The filter quality with which to apply the transform as a bitmap operation. [...]
final
hashCode int
The hash code for this object. [...]
@nonVirtual, read-only, inherited
key Key?
Controls how one widget replaces another widget in the tree. [...]
final, inherited
origin Offset?
The origin of the coordinate system (relative to the upper left corner of this render object) in which to apply the matrix. [...]
final
runtimeType Type
A representation of the runtime type of the object.
read-only, inherited
transform Matrix4
The matrix to transform the child by during painting.
final
transformHitTests bool
Whether to apply the transformation when performing hit tests.
final

Methods

createElement() SingleChildRenderObjectElement
RenderObjectWidgets always inflate to a RenderObjectElement subclass.
inherited
createRenderObject(BuildContext context) RenderTransform
Creates an instance of the RenderObject class that this RenderObjectWidget represents, using the configuration described by this RenderObjectWidget. [...]
override
debugDescribeChildren() List<DiagnosticsNode>
Returns a list of DiagnosticsNode objects describing this node's children. [...]
@protected, inherited
debugFillProperties(DiagnosticPropertiesBuilder properties) → void
Add additional properties associated with the node. [...]
inherited
didUnmountRenderObject(covariant RenderObject renderObject) → void
A render object previously associated with this widget has been removed from the tree. The given RenderObject will be of the same type as returned by this object's createRenderObject.
@protected, inherited
noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent method or property is accessed. [...]
inherited
toDiagnosticsNode({String? name, DiagnosticsTreeStyle? style}) DiagnosticsNode
Returns a debug representation of the object that is used by debugging tools and by DiagnosticsNode.toStringDeep. [...]
inherited
toString({DiagnosticLevel minLevel = DiagnosticLevel.info}) String
A string representation of this object. [...]
inherited
toStringDeep({String prefixLineOne = '', String? prefixOtherLines, DiagnosticLevel minLevel = DiagnosticLevel.debug}) String
Returns a string representation of this node and its descendants. [...]
inherited
toStringShallow({String joiner = ', ', DiagnosticLevel minLevel = DiagnosticLevel.debug}) String
Returns a one-line detailed description of the object. [...]
inherited
toStringShort() String
A short, textual description of this widget.
inherited
updateRenderObject(BuildContext context, covariant RenderTransform renderObject) → void
Copies the configuration described by this RenderObjectWidget to the given RenderObject, which will be of the same type as returned by this object's createRenderObject. [...]
override

Operators

operator ==(Object other) bool
The equality operator. [...]
@nonVirtual, inherited