onStart property

GestureDragStartCallback? onStart
read / write

A pointer has contacted the screen with a primary button and has begun to move.

The position of the pointer is provided in the callback's details argument, which is a DragStartDetails object. The dragStartBehavior determines this position.

See also:

  • allowedButtonsFilter, which decides which button will be allowed.
  • DragStartDetails, which is passed as an argument to this callback.

Implementation

GestureDragStartCallback? onStart;