Tag: animation

AnimatedSwitcher only transitions when Widget.canUpdate says the new child is a different widget, so Text to Text with no key just updates in place. Here is the one-line fix, where the key has to sit, why UniqueKey is a trap, the slide-direction bug caused by a static transitionBuilder, and the layout jump from the default Stack, all verified with widget tests on Flutter 3.44.8.

Wrap the same widget on both routes in a Hero with an identical tag and Flutter animates its position and size across the navigation. Full guide: images, flightShuttleBuilder, createRectTween, RectTween arcs, gesture transitions, and the tag collisions that break it. Tested on Flutter 3.44, Dart 3.12.