SliderController class

Reactive controller for managing slider state with value operations.

Extends ValueNotifier to provide state management for slider widgets using SliderValue objects that support both single and range slider configurations. Enables programmatic slider value changes and provides convenient methods for common slider operations.

The controller manages SliderValue objects which can represent either single values or dual-thumb range values, providing unified state management for different slider types.

Example:

final controller = SliderController(SliderValue.single(0.5));

// React to changes
controller.addListener(() {
  print('Slider value: ${controller.value}');
});

// Programmatic control
controller.setValue(0.75);
controller.setRange(0.2, 0.8);