PickerAdapter<T> class abstract

Abstract base class for picker data adapters.

PickerAdapter defines the interface that all picker data sources must implement. Different adapters provide different types of data and behaviors:

• PickerDataAdapter - For array/list based data with hierarchical support
• NumberPickerAdapter - For numeric ranges and sequences
• DateTimePickerAdapter - For date and time selection

Custom Adapters

You can create custom adapters by extending this class:

class MyCustomAdapter extends PickerAdapter<MyDataType> {
  @override
  int getLength() => myData.length;
  
  @override
  int getMaxLevel() => 1;
  
  @override
  Widget buildItem(BuildContext context, int index) {
    return Text(myData[index].toString());
  }
  
  // ... implement other required methods
}

See also:

• PickerDataAdapter for the most common use cases
• NumberPickerAdapter for numeric data
• DateTimePickerAdapter for date/time selection

Implementers

• DateTimePickerAdapter
• NumberPickerAdapter
• PickerDataAdapter

Constructors

PickerAdapter.new()

Properties

hashCode → int

The hash code for this object.

no setter, inherited

isLinkage → bool

no setter

length → int

Content length of current column

no setter

maxLevel → int

no setter

picker ↔ Picker?

Reference to the picker widget using this adapter.

getter/setter pair

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

text → String

no setter

Methods

buildItem(BuildContext context, int index) → Widget

Builds the widget for a specific item in the current column.

doSelect(int column, int index) → void

doShow() → void

getColumnFlex(int column) → int

getIsLinkage() → bool

getLength() → int

Returns the number of items in the current column.

getMaxLevel() → int

Returns the maximum number of columns (levels) this adapter supports.

getSelectedValues() → List<T>

getText() → String

initSelects() → void

Initializes the selected indices for all columns.

makeText(Widget? child, String? text, bool isSel) → Widget

makeTextEx(Widget? child, String text, Widget? postfix, Widget? suffix, bool isSel) → Widget

needUpdatePrev(int curIndex) → bool

Need to update previous columns

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

notifyDataChanged() → void

Notify adapter of data changes

setColumn(int index) → void

Sets the active column for subsequent operations.

toString() → String

A string representation of this object.

override

Operators

operator ==(Object other) → bool

The equality operator.

inherited