If hidden then shown Animation does not work

[vikkio88]

Hi there, nice project, I've learned so much from it, now I am trying out to show a spinner only if a certain condition happens and what I am seeing is that if is behind an IsVisible the animation does not work.

As an example I am putting here the xaml I use

    IsVisible="{Binding !CanClickGenerate}"
    Value="fa-spinner"
    Animation="Pulse"/>

for some reason once that bool flips, I can see the icon but it is not animated, I also tried wrapping it in a Panel to avoid touching Icon itself but it didn't work

<Panel Margin="0,30,0,0"
    IsVisible="{Binding !CanClickGenerate}">
    <i:Icon FontSize="20"
        Value="fa-spinner"
        Animation="Pulse"/>
</Panel>

using it by itself works just fine

<i:Icon FontSize="20"
    Value="fa-spinner"
    Animation="Pulse"/>

So I don't really know what the problem is or whether this is a bug

[just-seba]

I will look into it.
Maybe you could try an animation on another object than an icon to verify there is no bug in Avalonia itself?

[vikkio88]

will try it out, if you want I can share an example project

[just-seba]

Nice. An example project would help me. Thanks.

[vikkio88]

I was trying to compose an example and it works fine, I think the problem is in my app, as I am running an async task and I thought the dispatcher would run it in another thread instead it locks the UI thread and prevents the animation to run.

I am toggling a bool when I click a button to show the icon and animate it, and somethings happens like this

GenerateTeams = ReactiveCommand.CreateFromTask(() =>
        {
            CanClickGenerate = false;
            Dispatcher.UIThread.InvokeAsync(() =>
            {
                // a task that might take 1 second
                CanClickGenerate = true;
            }, DispatcherPriority.Background);

            return Task.CompletedTask;

        }, canGenerate);

I thought the dispatcher would run it somewhere else, maybe I misread the docs of avalonia, but it looks like it is not your issue man, thanks anyway