onTertiaryLongPressUp property Null safety
Called when the pointer stops contacting the screen after a long-press by a tertiary button.
This is equivalent to (and is called immediately after) onTertiaryLongPressEnd. The only difference between the two is that this callback does not contain details of the state of the pointer when it stopped contacting the screen.
- kTertiaryButton, the button this callback responds to.