KeyLabel class
A one-line key label drawn exactly in style.
A plain Text would force FontWeight.bold on every label under the
platform's Bold Text setting, erasing the weight difference between
digits and operators; the caller already made style heavier, so Bold
Text is switched off for this label only.
Runs of super- and subscripts (⁻¹ in sin⁻¹, ʸ in xʸ) are drawn
in CalseeSymbols at the label's weight (span), so a run never mixes
fonts. A label wider than the room it is given scales down to fit on
one line, and is never scaled up (m7-design §6).
- Inheritance
-
- Object
- DiagnosticableTree
- Widget
- StatelessWidget
- KeyLabel
Properties
- hashCode → int
-
The hash code for this object.
no setterinherited
- key → Key?
-
Controls how one widget replaces another widget in the tree.
finalinherited
- runtimeType → Type
-
A representation of the runtime type of the object.
no setterinherited
- span → TextSpan
-
What the label draws: text in style, with each run of super- and
subscripts (symbolRuns) in a child span styled symbolRunStyle.
A label without such a run is a single span.
no setter
- style → TextStyle
-
Its full style.
final
- text → String
-
The label.
final
Methods
-
build(
BuildContext context) → Widget -
Describes the part of the user interface represented by this widget.
override
-
createElement(
) → StatelessElement -
Creates a StatelessElement to manage this widget's location in the tree.
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
Operators
-
operator ==(
Object other) → bool -
The equality operator.
inherited
Static Methods
-
fontSizeFor(
String label, double shortSide) → double -
The label font size on a key whose shorter side is
shortSide: 0.4× for one or two characters, 0.3× for three or four, and 0.24× for five or more (m7-design §6), sosinh⁻¹is 13.4 dp on a 56 dp key, not 16.8.
Constants
- backspaceIcon → const IconData
- What backspaceText is drawn as. U+232B is in neither bundled font, so as text it fell back to a different system font on every platform (or to a missing-glyph box); the bundled Material icon looks the same everywhere.
- backspaceText → const String
-
The backspace label text (
CalcKeys.backspace.label).