barrierCurve property Null safety

The curve that is used for animating the modal barrier in and out.

The modal barrier is the scrim that is rendered behind each route, which generally prevents the user from interacting with the route below the current route, and normally partially obscures such routes.

For example, when a dialog is on the screen, the page below the dialog is usually darkened by the modal barrier.

While the route is animating into position, the color is animated from transparent to the specified barrierColor.

If this getter would ever start returning a different curve, either changedInternalState or changedExternalState should be invoked so that the change can take effect.

It is safe to use navigator.context to look up inherited widgets here, because the Navigator calls changedExternalState whenever its dependencies change, and changedExternalState causes the modal barrier to rebuild.

It defaults to Curves.ease.

See also:

• barrierColor, which determines the color that the modal transitions to.
• Curves for a collection of common curves.
• AnimatedModalBarrier, the widget that implements this feature.