onColorChangeStart property Null safety

ValueChanged<Color>? onColorChangeStart
final

Optional ValueChanged callback. Called when user starts color selection with current color value.

When clicking a new color in color items, the color value before the selected new value was clicked is returned. It is also called with the current start color when user starts the interaction on the color wheel or on a color or transparency slider.

Implementation

final ValueChanged<Color>? onColorChangeStart;