Page Flip Builder

A custom Flutter widget that enables interactive page-flip transitions in your app.

You can use this to flip images, cards, or widgets of any size.

Preview

Also see the Flutter Web Live Preview.

Usage

Note: This package uses null-safety.

PageFlipBuilder is best used for full-screen page-flip transitions, but works with widgets of any size as long as their width and height is not unbounded.

PageFlipBuilder uses a drag gesture to interactively transition between a "front" and a "back" widget. These are specified with the frontBuilder and backBuilder arguments:

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Container(
        // add a black background to prevent flickering on Android when the page flips
        color: Colors.black,
        child: PageFlipBuilder(
          frontBuilder: (_) => LightHomePage(),
          backBuilder: (_) => DarkHomePage(),
        ),
      ),
    );
  }
}

By defalt the flip happens along the vertical axis, but you can change the flipAxis to Axis.horizontal if you want.

For more control, you can also add a GlobalKey<PageFlipBuilderState> and programmatically flip the page with a callback-based API:

class MyApp extends StatelessWidget {
  // used to flip the page programmatically
  final pageFlipKey = GlobalKey<PageFlipBuilderState>();
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Container(
        // add a black background to prevent flickering on Android when the page flips
        color: Colors.black,
        child: PageFlipBuilder(
          key: pageFlipKey,
          frontBuilder: (_) => LightHomePage(
            onFlip: () => pageFlipKey.currentState?.flip(),
          ),
          backBuilder: (_) => DarkHomePage(
            onFlip: () => pageFlipKey.currentState?.flip(),
          ),
          // flip the axis to horizontal
          flipAxis: Axis.horizontal,
          // customize tilt value
          maxTilt: 0.003,
          // customize scale
          maxScale: 0.2,
          // be notified when the flip has completed
          onFlipComplete: (isFrontSide) => print('isFrontSide: $isFrontSide'),
        ),
      ),
    );
  }
}

Features

• Interactive flip transition using drag gestures (forward and reverse)
• Fling animation to complete the transition on drag release
• Flip page programmatically via callbacks
• Flip around the horizontal or vertical axis
• Flip widgets of any size
• Customizable flip duration, tilt, scale

Testing the example app

Before running the example app, you need to create the ios, android, web folders as needed:

flutter create . --platform ios
flutter create . --platform android
flutter create . --platform web

LICENSE: MIT