A delegate that controls the appearance of a flow layout.

Flow layouts are optimized for moving children around the screen using transformation matrices. For optimal performance, construct the FlowDelegate with an Animation that ticks whenever the delegate wishes to change the transformation matrices for the children and avoid rebuilding the Flow widget itself every animation frame.

See also:

Constructors

FlowDelegate({Listenable repaint })

The flow will repaint whenever repaint notifies its listeners.

const

Properties

hashCode → int

Get a hash code for this object.

read-only, inherited
runtimeType → Type

A representation of the runtime type of the object.

read-only, inherited

Operators

operator ==(other) → bool

The equality operator.

inherited

Methods

getConstraintsForChild(int i, BoxConstraints constraints) → BoxConstraints

Override to control the layout constraints given to each child.

getSize(BoxConstraints constraints) → Size

Override to control the size of the container for the children.

paintChildren(FlowPaintingContext context) → void

Override to paint the children of the flow.

shouldRelayout(FlowDelegate oldDelegate) → bool

Override this method to return true when the children need to be laid out. This should compare the fields of the current delegate and the given oldDelegate and return true if the fields are such that the layout would be different.

shouldRepaint(FlowDelegate oldDelegate) → bool

Override this method to return true when the children need to be repainted. This should compare the fields of the current delegate and the given oldDelegate and return true if the fields are such that paintChildren would act differently.

toString() → String

Override this method to include additional information in the debugging data printed by debugDumpRenderTree and friends.

noSuchMethod(Invocation invocation) → dynamic

Invoked when a non-existent method or property is accessed.

inherited