Transform class

A widget that applies a transformation before painting its child.

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:

  • RotatedBox, which rotates the child widget during layout, not just during painting.
  • FractionalTranslation, which applies a translation to the child that is relative to the child's size.
  • FittedBox, which sizes and positions its child widget to fit the parent according to a given BoxFit discipline.
Inheritance

Constructors

Transform({Key key, @required Matrix4 transform, Offset origin, AlignmentGeometry alignment, bool transformHitTests: true, Widget child })
Creates a widget that transforms its child. [...]
const
Transform.rotate({Key key, @required double angle, Offset origin, AlignmentGeometry alignment: Alignment.center, bool transformHitTests: true, 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: Alignment.center, bool transformHitTests: true, Widget child })
Creates a widget that scales its child uniformly. [...]
Transform.translate({Key key, @required Offset offset, bool transformHitTests: true, 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
origin Offset
The origin of the coordinate system (relative to the upper left corder of this render object) in which to apply the matrix. [...]
final
transform Matrix4
The matrix to transform the child by during painting.
final
transformHitTests bool
Whether to apply the transformation when performing hit tests.
final
child Widget
The widget below this widget in the tree. [...]
final, inherited
hashCode int
The hash code for this object. [...]
read-only, inherited
key Key
Controls how one widget replaces another widget in the tree. [...]
final, inherited
runtimeType Type
A representation of the runtime type of the object.
read-only, inherited

Methods

createRenderObject(BuildContext context) RenderTransform
Creates an instance of the RenderObject class that this RenderObjectWidget represents, using the configuration described by this RenderObjectWidget. [...]
override
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
createElement() SingleChildRenderObjectElement
RenderObjectWidgets always inflate to a RenderObjectElement subclass.
inherited
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 toStringDeep. [...]
inherited
toString({DiagnosticLevel minLevel: DiagnosticLevel.debug }) String
Returns 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

Operators

operator ==(dynamic other) bool
The equality operator. [...]
inherited