GlassTravel class Composition

Declares that the glass below may move anywhere inside this widget's box, and asks the host to capture the whole box for it.

What it buys: a surface moving over still content inside the region is drawn from the proxy already held — no capture, no repack. What it costs: the slot is the region rather than the surface, so the atlas holds more screen. Worth it for a control whose glass moves while a finger is down; not for a panel that sits still.

Motion is free only if moving the glass repaints nothing else: the proxy is also retaken when content under it changes, and a repaint mints a new picture in whichever repaint boundary owns it. So the moving surface's parent should paint nothing of its own — the content it moves over belongs behind a RepaintBoundary of its own, which is what the package's own components do.

A surface that leaves the region is captured again, so the declaration is a price and never a correctness claim: a region drawn too small costs captures, never a wrong picture.

GlassTravel(
  child: SizedBox(
    width: 320,
    height: 64,
    child: Stack(
      children: <Widget>[
        const Positioned.fill(child: RepaintBoundary(child: Track())), // still content
        AnimatedPositioned(
          duration: const Duration(milliseconds: 200),
          left: knobX,
          top: 8,
          width: 48,
          height: 48,
          child: const GlassSurface(borderRadius: kGlassCapsule),
        ),
      ],
    ),
  ),
)

See also:

• GlassSlider, GlassSwitch and GlassTabBar, whose drops move inside one.
• GlassMorph, which can move inside one around a fixed-size ancestor.
• Travel on the site.

Inheritance

• Object
• DiagnosticableTree
• Widget
• StatefulWidget
• GlassTravel

Constructors

GlassTravel({required Widget child, Key? key})

Declares child's box as the region the glass inside it moves within.

const

Properties

child → Widget

The subtree whose glass moves; the region is this child's box.

final

hashCode → int

The hash code for this object.

no setter, 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.

no setter, inherited

Methods

createElement() → StatefulElement

Creates a StatefulElement to manage this widget's location in the tree.

inherited

createState() → State<GlassTravel>

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