FluentColorPickerScope class

Carries the picker's colour, shape and change callback down to the controls inside it.

The Flutter answer to upstream's React context. A plain InheritedWidget and not an InheritedTheme: it holds a value, not a style, and a picker and its children always share a subtree — capturing a stale colour into an overlay would be a bug, not a feature.

Not an InheritedModel either. The dependency graph is dense — the alpha rail depends on hue, saturation and value; the saturation and value rails on hue; every control on the colour — so per-aspect notification would save almost nothing and buy a whole class of bug where a forgotten aspect makes a control quietly stop updating.

A rebuild costs three build calls, three style resolutions and three shouldRepaint checks. The element types are stable, so nothing is remounted and nothing re-lays-out.

Inheritance

• Object
• DiagnosticableTree
• Widget
• ProxyWidget
• InheritedWidget
• FluentColorPickerScope

Constructors

FluentColorPickerScope({Key? key, required HSVColor color, required FluentColorPickerShape shape, required ValueChanged<HSVColor>? onColorChanged, required Widget child})

Publishes color, shape and onColorChanged to child.

const

Properties

child → Widget

The widget below this widget in the tree.

final, inherited

color → HSVColor

The colour every control inside shows, unless it was given its own.

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

onColorChanged → ValueChanged<HSVColor>?

Called by a control inside with the colour it landed on. Null disables every control that has no callback of its own.

final

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

shape → FluentColorPickerShape

The corner treatment every control inside takes, unless it was given its own.

final

Methods

createElement() → InheritedElement

Inflates this configuration to a concrete instance.

inherited

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

updateShouldNotify(covariant FluentColorPickerScope oldWidget) → bool

Whether the framework should notify widgets that inherit from this widget.

override

Operators

operator ==(Object other) → bool

The equality operator.

inherited

Static Methods

maybeOf(BuildContext context) → FluentColorPickerScope?

The nearest picker scope, or null when a control stands alone.