HoldDownButton constructor

HoldDownButton({ Key? key, required Widget child, required VoidCallback onHoldDown, Duration longWait = const Duration(milliseconds: 600), Duration middleWait = const Duration(milliseconds: 400), Duration minWait = const Duration(milliseconds: 250), Duration holdWait = const Duration(milliseconds: 100), })

Creates a HoldDownButton widget. Great to use when want to execute a function continuously when the button is hold.

• Can be used to make any Widget execute a function periodically when it is hold down.
• Curve/flow towards periodic function execution can be changed. (That is time between each initial function call can be customized.)
• After a long press is detected, the onHoldDown function will be called immediately.

Implementation

HoldDownButton({
  super.key,
  required this.child,
  required this.onHoldDown,
  this.longWait = const Duration(milliseconds: 600),
  this.middleWait = const Duration(milliseconds: 400),
  this.minWait = const Duration(milliseconds: 250),
  this.holdWait = const Duration(milliseconds: 100),
})  : assert(
        (longWait.inMicroseconds >= middleWait.inMicroseconds) &&
            (middleWait.inMicroseconds >= minWait.inMicroseconds) &&
            (minWait.inMicroseconds >= holdWait.inMicroseconds),
        'Initial delays should follow a descending order.',
      ),
      assert(!holdWait.isNegative, 'holdWait cannot be negative.');