The button shows it's child content instead of continuing with the InProgress animation. Here is an example in this state:

The problem appears to relate too the snippet below. In this case, the animation will stop running after it's first completion:

https://github.com/halilozercan/ProgressButton/blob/5d4d39b1bc0cfd440623a293a1f6e9ae12ff62a8/lib/progress_button.dart#L106-L108

When you type the last digit the onSubmit isn't invoked because of the error: W/FlutterTextInput(17572): Unsupported operation: Cannot clear a fixed-length list

This is because you try to invoke _pin.clear() in the clearTextFields method and dart doesn't allow it. I replaced it with _pin.forEach((e) => e = ""); and not it works alright.

Doctor summary (to see all details, run flutter doctor -v): [√] Flutter (Channel dev, v1.2.0, on Microsoft Windows [Version 10.0.14393], locale hr-HR) [√] Android toolchain - develop for Android devices (Android SDK version 28.0.3) [√] Android Studio (version 3.3) [√] VS Code (version 1.26.1) [√] VS Code, 64-bit edition (version 1.30.2) [√] Connected device (1 available)

In the constructor you can pass only the string value for the text widget which is created in normal button state.

val progressButton = ProgressButton(
    onPressed: VoidCallback,
    **text: "Login",**
    buttonState: ButtonState.normal,
    pBackgroundColor: Theme.of(context).primaryColor,
    pTextColor: Theme.of(context).primaryTextTheme.button.color,
    pProgressColor: Theme.of(context).primaryColor,
);

The problem is that this doesn't support styling the text. Maybe even a better approach would be to allow a widget to be passed in for normal button state.

════════ Exception caught by widgets library ═══════════════════════════════════════════════════════
The following assertion was thrown while finalizing the widget tree:
_ProgressButtonState#99899(tickers: tracking 2 tickers) was disposed with an active Ticker.

...

Tickers used by AnimationControllers should be disposed by calling dispose() on the AnimationController itself. Otherwise, the ticker will leak.

When disposing of a widget that contains a button actively being animated, the above error appears.

This widget should dispose of its AnimationControllers itself.

Because i new in Flutter and here is my problem...

I import the package import 'package:progress_button/progress_button.dart';

I don't not where i has to copy this:

val progressButton = ProgressButton(
    child: Text("Login"),
    onPressed: VoidCallback,
    buttonState: ButtonState.normal,
    backgroundColor: Theme.of(context).primaryColor,
    progressColor: Theme.of(context).primaryColor,
);

Is really the word "val" is the correct? not "var"? And the onPressed event "VoidCallback"...the error debug says: "The argument type 'Type' can't be assigned to the parameter type '() → void'."

Can you help me with that? Thanks!