TouchBehavior doesn't work correctly on custom control

[Chris-TritonAppworks]

I've built a custom button control, using ContentView as the base. I'm trying to make Press work correctly but finding it impossible. I'm also trying to use VisualStates here. The behavior I'm getting is as follows:

• Pressing the button puts it into the Pressed state, which persists after the button is released.
• The (press) command is not called until the button is clicked a second time. My command method sets the visual state back to Normal.
• I also tried handling TouchGestureRecognizer.Tapped, but the behavior is the same.
• Many TaskCanceledExceptions are thrown, which has been reported by other devs for more than a year:

MyButton-TestApp Information: 0 : System.Threading.Tasks.TaskCanceledException: A task was canceled.
   at CommunityToolkit.Maui.Behaviors.GestureManager.SetBackgroundColor(TouchBehavior touchBehavior, TouchState touchState, HoverState hoverState, TimeSpan duration, Easing easing, CancellationToken token) in /_/src/CommunityToolkit.Maui/Behaviors/PlatformBehaviors/Touch/GestureManager.shared.cs:line 780
   at CommunityToolkit.Maui.Behaviors.GestureManager.RunAnimationTask(TouchBehavior touchBehavior, TouchState touchState, HoverState hoverState, CancellationToken token, Nullable`1 durationMultiplier) in /_/src/CommunityToolkit.Maui/Behaviors/PlatformBehaviors/Touch/GestureManager.shared.cs:line 799
   at CommunityToolkit.Maui.Behaviors.GestureManager.ChangeStateAsync(TouchBehavior touchBehavior, Boolean animated, CancellationToken token) in /_/src/CommunityToolkit.Maui/Behaviors/PlatformBehaviors/Touch/GestureManager.shared.cs:line 118
   at CommunityToolkit.Maui.Behaviors.TouchBehavior.ForceUpdateState(CancellationToken token, Boolean animated) in /_/src/CommunityToolkit.Maui/Behaviors/PlatformBehaviors/Touch/TouchBehavior.methods.shared.cs:line 62

XAML:

<ContentView x:Name="ThisButton">

    <ContentView.Behaviors>
        <toolkit:TouchBehavior
            BindingContext="{Binding Path=BindingContext, Source={x:Reference ThisButton}, x:DataType=local:MyButton}"
            DefaultAnimationDuration="50"
            DefaultAnimationEasing="{x:Static Easing.CubicInOut}"
            Command="{Binding ButtonPressedCommand}" />
    </ContentView.Behaviors>

...

</ContentView>

Codebehind:

[RelayCommand]
private void ButtonPressed()
{
    Debug.WriteLine("ButtonPressed executed");
    Dispatcher.DispatchDelayed(TimeSpan.FromMilliseconds(100), () =>
    {
        VisualStateManager.GoToState(this, "Normal");
    });
}

I expect this to put the button into the Pressed state until the user releases the button or lifts their finger, at which point the visual state should return to Normal. I should not have to do that manually. And I certainly don't expect a flurry of exceptions (please chime in if you know why they are happening, maybe that's the cause of this whole mess).

I was surprised that something so fundamental didn't work nicely. Can anyone provide guidance on a working approach or workaround? (I followed the [TouchBehavior sample](https://github.com/CommunityToolkit/Maui/tree/main/samples/CommunityToolkit.Maui.Sample/Pages/Behaviors/TouchBehavior))

I don't have much hair left to pull out -- thanks for any help.

[development-jantar]

@Chris-TritonAppworks is this similar to yours? #2894

[Chris-TritonAppworks]

Mine is due to conflict between TouchBehavior and VisualStates. I have resolved some of the issues, but it is a very touchy 😄 balancing act. Right now I have the Normal and Pressed states working correctly via the CurrentTouchStateChanged event. But for some reason, the Command isn't being invoked.

<ContentView.Behaviors>
    <toolkit:TouchBehavior
        BindingContext="{Binding Path=BindingContext, Source={x:Reference ThisButton}, x:DataType=ContentView}"
        Command="{Binding ButtonPressedCommand}"
        CurrentTouchStateChanged="OnTouchStateChanged" />
</ContentView.Behaviors>

[RelayCommand]
private void ButtonPressed()
{
    Debug.WriteLine("ButtonPressed executed");
}

[IeuanWalker]

Might want to try my control out if you're trying to get the different states - https://github.com/IeuanWalker/Maui.StateButton

Not sure how accessible the touch behaviours are