Implicit Flutter Animations

Oct 4 2022 Dart 2.17, Flutter 3.0, Visual Studio Code 1.7

Part 2: Implicit Animations in Action

7. Create a Card Flip Animation

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Previous episode: 6. Create a Custom PageView Animation Next episode: 8. Create a Multi-Selection Animation

The student materials have been reviewed and are updated as of August 2022.

The updated material uses null safety and also deploys the use coding practises encouraged by the Flutter as per the Flutter lint rules and a few addons of practises that are considered good here at raywenderlich (see analysis_options.yaml in the material for more info).

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In this episode, we would be creating a card flip animation. You’ll learn how to trigger animations based on form interations. Let’s head over to the add_card_screen.

import 'dart:math' as math;
...
@override
Widget build(BuildContext context) {
    double rotationFactor = _isCvvFocused ? 1.0 : 0.0; // Add this
    ...
    // Paste this
    TweenAnimationBuilder(
        duration: const Duration(milliseconds: 1000),
        curve: Curves.fastOutSlowIn,
        tween: Tween(begin: rotationFactor, end: rotationFactor),
        builder: (context, value, child) {
        return Transform(
            transform: Matrix4.identity()
            ..setEntry(3, 2, 0.001) // perspective
            ..rotateY(math.pi * value),
            alignment: FractionalOffset.center,
            child: value < 0.5
                ? FrontCard(
                    cardNumber:
                        (formData['card_number'] as String?) ?? '-',
                    cardName: (formData['card_name'] as String?) ?? '-',
                    expiryDate: formData['expiry_date'] as DateTime?,
                )
                : BackCard(
                    cvv: (formData['cvv'] as String?) ?? '-',
                ),
        );
        },
    ),

class BackCard extends StatelessWidget {
  ...
  @override
  Widget build(BuildContext context) {
    return Transform(
      transform: Matrix4.identity()
        ..setEntry(3, 2, 0.001) // perspective
        ..rotateY(math.pi),
      alignment: FractionalOffset.center,
      child: Container(
          ...