Flutter Animations Cheat Sheet
Animations are a key component of building interactive and visually appealing Flutter applications. They can bring your UI to life, making transitions between screens or states feel smooth and engaging. Whether you're animating widgets in or out, resizing elements, or creating complex multi-step animations, Flutter's animation framework provides all the tools you need.
Curves
An integral part of animations are Curves. They allow you to control when an animation speeds up and when it slows down, providing a more dynamic and natural flow. With curves, you can give your animations a sense of life and fluidity, making transitions appear more polished.
Transitions and Animated Widgets
When working with animations in Flutter, you'll come across two main approaches: Transitions and Animated Widgets.
Transitions
Transitions (e.g., SlideTransition) are lightweight and clean to combine. They don’t require being placed in a StatefulWidget, but they do need access to an Animation object, which is usually handled by an AnimationController. Although Transitions might seem harder to use initially compared to Animated Widgets, they lead to cleaner and more maintainable code, especially when building advanced animations.
Current Transitions in Flutter Animations:
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Animated Widgets
Animated Widgets (e.g., AnimatedCrossFade) offer a more pre-built, compound solution. They can combine multiple animations into one widget — for example, AnimatedContainer can animate size, color, border, and more simultaneously. Although these widgets are easier to use for basic animations, they are less flexible compared to Transitions and need to be wrapped in a StatefulWidget to use setState() for updates.
Current Animated Widgets in Flutter Animations:
To explore these in action, check out the https://docs.flutter.dev/ui/animations.
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