CupertinoPicker class
An iOS-styled picker.
Displays its children widgets on a wheel for selection and calls back when the currently selected item changes.
Can be used with showModalBottomSheet to display the picker modally at the bottom of the screen.
See also:
- ListWheelScrollView, the generic widget backing this picker without the iOS design specific chrome.
- developer.apple.com/ios/human-interface-guidelines/controls/pickers/
- Inheritance
- Object
- Diagnosticable
- DiagnosticableTree
- Widget
- StatefulWidget
- CupertinoPicker
Constructors
-
CupertinoPicker({Key key, double diameterRatio: _kDefaultDiameterRatio, Color backgroundColor: _kDefaultBackground, double offAxisFraction: 0.0, bool useMagnifier: false, double magnification: 1.0, FixedExtentScrollController scrollController, @required double itemExtent, @required ValueChanged<
int> onSelectedItemChanged, @required List< Widget> children, bool looping: false }) - Creates a picker from a concrete list of children. [...]
-
CupertinoPicker.builder({Key key, double diameterRatio: _kDefaultDiameterRatio, Color backgroundColor: _kDefaultBackground, double offAxisFraction: 0.0, bool useMagnifier: false, double magnification: 1.0, FixedExtentScrollController scrollController, @required double itemExtent, @required ValueChanged<
int> onSelectedItemChanged, @required IndexedWidgetBuilder itemBuilder, int childCount }) - Creates a picker from an IndexedWidgetBuilder callback where the builder is dynamically invoked during layout. [...]
Properties
- backgroundColor → Color
-
Background color behind the children. [...]
final
- childDelegate → ListWheelChildDelegate
-
A delegate that lazily instantiates children.
final
- diameterRatio → double
-
Relative ratio between this picker's height and the simulated cylinder's diameter. [...]
final
- itemExtent → double
-
The uniform height of all children. [...]
final
- magnification → double
-
The zoomed-in rate of the magnifier, if it is used. [...]
final
- offAxisFraction → double
-
How much the wheel is horizontally off-center, as a fraction of its width.
This property creates the visual effect of looking at a vertical wheel from
its side where its vanishing points at the edge curves to one side instead
of looking at the wheel head-on. [...]
final
-
onSelectedItemChanged
→ ValueChanged<
int> -
An option callback when the currently centered item changes. [...]
final
- scrollController → FixedExtentScrollController
-
A FixedExtentScrollController to read and control the current item. [...]
final
- useMagnifier → bool
-
Whether to use the magnifier for the center item of the wheel.
final
- hashCode → int
-
The hash code for this object. [...]
read-only, 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.
read-only, inherited
Methods
-
createState(
) → State< StatefulWidget> -
Creates the mutable state for this widget at a given location in the tree. [...]
override
-
createElement(
) → StatefulElement -
Creates a StatefulElement to manage this widget's location in the tree. [...]
inherited
-
debugDescribeChildren(
) → List< DiagnosticsNode> -
Returns a list of DiagnosticsNode objects describing this node's
children. [...]
@protected, inherited
-
debugFillProperties(
DiagnosticPropertiesBuilder properties) → void -
Add additional properties associated with the node. [...]
inherited
-
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a non-existent 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 toStringDeep. [...]
inherited
-
toString(
{DiagnosticLevel minLevel: DiagnosticLevel.debug }) → String -
Returns a string representation of this object.
inherited
-
toStringDeep(
{String prefixLineOne: '', String prefixOtherLines, DiagnosticLevel minLevel: DiagnosticLevel.debug }) → 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 ==(
dynamic other) → bool -
The equality operator. [...]
inherited