Hi, thank you for your library! But I think the page transformer doesn't work well if the initial page is not zero. Scrolling a little triggers the NotificationListener and then everything is fine.

Here are some screenshots.

flutter run Launching lib/main.dart on ONEPLUS A5010 in debug mode... Initializing gradle... 0.7s Resolving dependencies...

• Error running Gradle: ProcessException: Process "/Users/pixarise/Code/page-transformer/android/gradlew" exited abnormally:

BUILD FAILED

Total time: 0.606 secs

FAILURE: Build failed with an exception.

• Where: Build file '/Users/pixarise/Code/page-transformer/android/build.gradle' line: 3

• What went wrong: A problem occurred evaluating root project 'android'.

Could not find method google() for arguments [] on repository container.

• Try: Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Command: /Users/pixarise/Code/page-transformer/android/gradlew app:properties

Please review your Gradle project setup in the android/ folder.

Correct _calculatePagePosition() for case when PageVisibilityResolver has null (initial) properties, and PageController.initialPage is non-zero. I expect this will fix https://github.com/roughike/page-transformer/issues/7

Hi guys,

I use your lib in my project. After time, I upgrade the project with Dart 2 and now I have the important issue, so I cannot compile

Running "flutter packages upgrade" in baby_learn_with_game...
The current Dart SDK version is 2.1.0-dev.1.0.flutter-ccb16f7282. Because baby_learn_with_game depends on page_transformer any which requires SDK version <2.0.0, version solving failed.
pub upgrade failed (1)

Have idea how to fix it?

J

If someone is looking for a page indicator as well.

  DotsIndicator({
    this.controller,
    this.itemCount,
    this.onPageSelected,
    this.color: Colors.white,
  }) : super(listenable: controller);

  /// The PageController that this DotsIndicator is representing.
  final PageController controller;

  /// The number of items managed by the PageController
  final int itemCount;

  /// Called when a dot is tapped
  final ValueChanged<int> onPageSelected;

  /// The color of the dots.
  ///
  /// Defaults to `Colors.white`.
  final Color color;

  // The base size of the dots
  static const double _kDotSize = 8.0;

  // The increase in the size of the selected dot
  static const double _kMaxZoom = 2.0;

  // The distance between the center of each dot
  static const double _kDotSpacing = 25.0;

  Widget _buildDot(int index) {
    double selectedness = Curves.easeOut.transform(
      max(
        0.0,
        1.0 - ((controller.page ?? controller.initialPage) - index).abs(),
      ),
    );
    double zoom = 1.0 + (_kMaxZoom - 1.0) * selectedness;
    return new Container(
      width: _kDotSpacing,
      child: new Center(
        child: new Material(
          color: color,
          type: MaterialType.circle,
          child: new Container(
            width: _kDotSize * zoom,
            height: _kDotSize * zoom,
            child: new InkWell(
              onTap: () => onPageSelected(index),
            ),
          ),
        ),
      ),
    );
  }

  Widget build(BuildContext context) {
    return new Row(
      mainAxisAlignment: MainAxisAlignment.center,
      children: new List<Widget>.generate(itemCount, _buildDot),
    );
  }
}

Reference