UiTimePicker class
Simple hour/minute wheel picker (24-hour clock).
Uses two ListWheelScrollViews for the hour and minute columns.
Disabled minute/hour values are skipped by the predicate hook.
Performance notes (PR-D)
The active-item styling for each wheel is driven by a
ValueNotifier<int> that the ListWheelScrollView updates on
every onSelectedItemChanged. The item builder listens via
ValueListenableBuilder, so only the one or two row widgets whose
active/inactive state just changed rebuild — the parent picker
does not setState on every wheel tick. Previously a fling
ran through _UiTimePickerState.setState for every snapped index,
which in turn rebuilt the outer UiBox + both wheel subtrees on
every frame of the fling deceleration. That was the visible
"scrolling lag" on low-powered Android devices: the minute column
was rebuilding 30–40 times during a normal fling even though its
structure hadn't changed.
onChanged is still invoked once per snapped index so external
listeners (form state, other pickers) see the full stream of
intermediate values during a fling, unchanged from before.
- Inheritance
-
- Object
- DiagnosticableTree
- Widget
- StatefulWidget
- UiTimePicker
- Annotations
-
- @Deprecated('Use UiTimeGridPicker for inline picker surfaces or UiTimePickerField for ' 'form fields. The wheel picker will remain available through the next minor ' 'release for migration.')
Constructors
-
UiTimePicker({Key? key, UiTimeValue? value, ValueChanged<
UiTimeValue> ? onChanged, int minuteStep = 1, bool hourDisabled(int hour)?, String? semanticsPrefix}) -
const
Properties
- hashCode → int
-
The hash code for this object.
no setterinherited
- hourDisabled → bool Function(int hour)?
-
Returns
truefor hours (0..23) that cannot be chosen.final - key → Key?
-
Controls how one widget replaces another widget in the tree.
finalinherited
- minuteStep → int
-
final
-
onChanged
→ ValueChanged<
UiTimeValue> ? -
final
- runtimeType → Type
-
A representation of the runtime type of the object.
no setterinherited
- semanticsPrefix → String?
-
Optional spoken prefix applied to wheel-row semantics labels.
final
- value → UiTimeValue?
-
final
Methods
-
createElement(
) → StatefulElement -
Creates a StatefulElement to manage this widget's location in the tree.
inherited
-
createState(
) → State< UiTimePicker> -
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