RanimatedContainer class

A Container but animates in a way that's well suited to layout animations. We can define "ranimation" as a way of implementing animation where the layout update is instant (where in a sense it has already ran), but where the visuals move to the new layout smoothly. It has many advantages:

  • Doesn't have to call layout every frame of the animation
  • Can animate layout changes (conventional animations can't, or can only animate it in limited ways while making it very awkward to work with)
  • Allows the user to immediately interact with the application as if the change had completed, rather than having to wait for the animation to complete. This also avoids certain kinds of bugs.
  • Allows the animation to plan its motion more intelligently because the target isn't constantly being changed. shortcomings and bugs there's some major todo here though:
  • need to interpolate between decorations (using lerpTo methods)
  • Animate changes to the clipping rect on size change, not just the decoration.
  • Adjust the animation using alignment as a positioning cue as to how the origin of the RenderObject probably moved as a result of the size change.
  • Also animate the offset of the contents. Ranimated objects can't animate their origins.
  • Render decoration foreground in front of the child.
Inheritance

Constructors

RanimatedContainer.new({Key? key, AlignmentGeometry? alignment, EdgeInsetsGeometry? padding, Color? color, Decoration? decoration, Decoration? foregroundDecoration, double? width, double? height, BoxConstraints? constraints, EdgeInsetsGeometry? margin, Matrix4? transform, AlignmentGeometry? transformAlignment, Widget? child, Clip clipBehavior = Clip.none, required Duration animationDuration})
Creates a widget that combines common painting, positioning, and sizing widgets.

Properties

alignment → AlignmentGeometry?
Align the child within the container.
final
animationDuration → Duration
final
child → Widget?
The child contained by the container.
final
clipBehavior → Clip
The clip behavior when RanimatedContainer.decoration is not null.
final
color → Color?
The color to paint behind the child.
final
constraints → BoxConstraints?
Additional constraints to apply to the child.
final
decoration → Decoration?
The decoration to paint behind the child.
final
foregroundDecoration → Decoration?
The decoration to paint in front of the child.
final
hashCode → int
The hash code for this object.
no setterinherited
key → Key?
Controls how one widget replaces another widget in the tree.
finalinherited
margin → EdgeInsetsGeometry?
Empty space to surround the decoration and child.
final
padding → EdgeInsetsGeometry?
Empty space to inscribe inside the decoration. The child, if any, is placed inside this padding.
final
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
transform → Matrix4?
The transformation matrix to apply before painting the container.
final
transformAlignment → AlignmentGeometry?
The alignment of the origin, relative to the size of the container, if transform is specified.
final

Methods

createElement() → StatefulElement
Creates a StatefulElement to manage this widget's location in the tree.
inherited
createState() → State<RanimatedContainer>
Creates the mutable state for this widget at a given location in the tree.
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
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, int wrapWidth = 65}) → 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 ==(Object other) → bool
The equality operator.
inherited