DoubleAnimation Completed Binding

[pedrollanes]

Is there any way to bind a storyboard completed event?

[Antony Male]

Looks like a normal event: have you tried using an action with it?

(In future, please open questions as discussions. GitHub have removed the helpful button letting me turn issues into discussions however annoyingly)

[pedrollanes]

Sorry I will do it in the future.
I tried to use action but I recieved an error. I think that is an special event and a normal binding action doesn't work

[Antony Male]

What error did you get, exactly?

[pedrollanes]

With this code
<Trigger Property="Visibility" Value="Visible"> <Trigger.EnterActions> <BeginStoryboard> <Storyboard> <DoubleAnimation Completed="{s:Action Check}" Storyboard.TargetProperty="Opacity" From="0.0" To="1.0" Duration="0:0:2.5" /> </Storyboard> </BeginStoryboard> </Trigger.EnterActions> </Trigger>
and viewmodel action:
public Task Check() { var a = 0; return Task.CompletedTask; }

Error
Stylet.Xaml.ActionNotSetException: 'View.ActionTarget not set on control System.Windows.Media.Animation.DoubleAnimation (method Check). This probably means the control hasn't inherited it from a parent, e.g. because a ContextMenu or Popup sits in the visual tree. You will need so set 's:View.ActionTarget' explicitly. See the wiki section "Actions" for more details.'

[Antony Male]

Aah, so it can't find the ActionTarget. It should have been able to get something from IRootObjectProvider, but it seems not in this case. I'll have to look at why WPF is behaving that way. You can follow the instructions, and set s:View.ActionTarget to your ViewModel.

[Antony Male]

I just tried to reproduce this and failed. From Stylet.Samples.Hello, I replaced the Button with:

<Button Command="{s:Action SayHello}" Content="SayHello" Visibility="{Binding CanSayHello, Converter={x:Static s:BoolToVisibilityConverter.Instance}}">
    <Button.Style>
        <Style TargetType="Button">
            <Style.Triggers>
                <Trigger Property="Visibility" Value="Visible">
                    <Trigger.EnterActions>
                        <BeginStoryboard>
                            <Storyboard>
                                <DoubleAnimation Completed="{s:Action Check}" Storyboard.TargetProperty="Opacity" From="0.0" To="1.0" Duration="0:0:2.5" />
                            </Storyboard>
                        </BeginStoryboard>
                    </Trigger.EnterActions>
                </Trigger>
            </Style.Triggers>
        </Style>
    </Button.Style>
</Button>

and add public void Check() { } to the VM. The animation works, and Check is correctly invoked at the end.

Please could you add a full repro?

[pedrollanes]

OK, this afternoon I'll see and I tell you.

[pedrollanes]

Ok I have inserted all content into a button and it works. But if i use in a grid doesn't work. I suppose its right. Thanks

[Antony Male]

Can you post a repro, please? That's not enough information for me to tell what's happening.

[pedrollanes]

Ok the problem is that I was putting trigger in a style of a resource dictionary. When I put all the style in the button I have no problem.

[Antony Male]

Ah yeah, it will struggle to find the VM from a ResourceDictionary