A widget that does a fade and size transition between a "new" widget and the "old "widget previously set as a child. The "old" and the "new" child must have the same width, but can have different heights, and you don't need to know their sizes in advance.
You can also define a duration and curve for both the fade and the size, separately.
Important: If the "new" child is the same widget type as the "old" child, but with different
AnimatedSizeAndFade will NOT do a transition between them, since as far as
the framework is concerned, they are the same widget, and the existing widget can be updated
with the new parameters. To force the transition to occur, set a
Key (typically a
taking any widget data that would change the visual appearance of the widget) on each child
widget that you wish to be considered unique.
Note: This is the StackOverflow question that prompted this widget development: https://stackoverflow.com/questions/51736663/in-flutter-how-can-i-change-some-widget-and-see-it-animate-to-its-new-size/
Use it like this:
bool toggle=true; Widget widget1 = ...; Widget widget2 = ...; AnimatedSizeAndFade( vsync: this, child: toggle ? widget1 : widget2 );
How does AnimatedSizeAndFade compare to other similar widgets?
AnimatedCrossFadeyou must keep both the firstChild and secondChild, which is not necessary with
AnimatedSwitcheryou may simply change its child, but then it only animates the fade, not the size.
AnimatedContaineralso doesn't work unless you know the size of the children in advance.
Import the package
First, add animated_size_and_fade as a dependency in your pubspec.yaml
Then, import it: