animationOpensAt property
final
The point at which the CupertinoContextMenu begins to animate into the open position.
A value between 0.0 and 1.0 corresponding to a point in builder's animation. When passing in an animation to builder the range before animationOpensAt will correspond to the animation when the widget is pressed and held, and the range after is the animation as the menu is fully opening. For an example, see the documentation for builder.
Implementation
static final double animationOpensAt =
_previewLongPressTimeout.inMilliseconds / _animationDuration;