Transform class
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.
link
ColoredBox(
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.
- The catalog of layout widgets.
- Inheritance
Constructors
- Transform({Key? key, required Matrix4 transform, Offset? origin, AlignmentGeometry? alignment, bool transformHitTests = true, FilterQuality? filterQuality, Widget? child})
-
Creates a widget that transforms its child.
const
- Transform.flip({Key? key, bool flipX = false, bool flipY = false, Offset? origin, bool transformHitTests = true, FilterQuality? filterQuality, Widget? child})
- Creates a widget that mirrors its child about the widget's center point.
- Transform.rotate({Key? key, required double angle, Offset? origin, AlignmentGeometry? alignment = Alignment.center, bool transformHitTests = true, FilterQuality? filterQuality, Widget? child})
- Creates a widget that transforms its child using a rotation around the center.
- Transform.scale({Key? key, double? scale, double? scaleX, double? scaleY, Offset? origin, AlignmentGeometry? alignment = Alignment.center, bool transformHitTests = true, FilterQuality? filterQuality, Widget? child})
- Creates a widget that scales its child along the 2D plane.
- Transform.translate({Key? key, required Offset offset, bool transformHitTests = true, 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.
finalinherited
- filterQuality → FilterQuality?
-
The filter quality with which to apply the transform as a bitmap operation.
final
- hashCode → int
-
The hash code for this object.
no setterinherited
- key → Key?
-
Controls how one widget replaces another widget in the tree.
finalinherited
- 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.
no setterinherited
- 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.
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.
inherited
-
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a nonexistent 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.
inherited