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Request for closer information about routed events

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ManniAT
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ManniAT asked on 20 Apr 2009, 10:11 AM

Hi,

I hope you can give me some clarity about RoutedEvents (not about the thing at all - I know it from WPF) my question is about your Silverlight implementation.
I first tried it with the help - but there is no chapter about routed events - I can only find the class documentation.

I watched this session:
http://blogs.telerik.com/NikolayAtanasov/Posts/09-02-05/New_Training_Session_on_Silverlight_Routed_Events.aspx

And as I saw in the TOC there is a topic "set from XAML" I thought - wow - great.
But by watching the sample I saw the at the "from XAML" part there was only a demonstration that I can consume this event defined on the button in XAML - that has nothing to do with RoutedEvents - it's just a proof that the implemented property is accessible from XAML.

The code looks like this:

<StackPanel Name="ButtonPanel" Grid.Column="0" Background="LightGray" Orientation="Horizontal" HorizontalAlignment="Center" > 
    <MyControls:MyButton Name="btnYes" Content="Yes" Height="50" Width="50" Margin="2" PreviewPressed="MyButton_PreviewPressed"></MyControls:MyButton> 
    <MyControls:MyButton Name="btnNo" Content="No" Height="50" Width="50" Margin="2"></MyControls:MyButton> 
    <MyControls:MyButton Name="btnCancel" Content="Cancel" Height="50" Width="50" Margin="2"></MyControls:MyButton> 
</StackPanel> 
 
So as you can see - the "routed event" is assigned on the button - but in this case it isn't what I want to have from a routed event.
So I gave it a try (if it really works from XAML - in code behind it works I know) and changed the code like this:
<StackPanel MyControls:MyButton.PreviewPressed="myPressed" Name="ButtonPanel" Grid.Column="0" Background="LightGray" Orientation="Horizontal" HorizontalAlignment="Center" > 
    <MyControls:MyButton Name="btnYes" Content="Yes" Height="50" Width="50" Margin="2" PreviewPressed="MyButton_PreviewPressed"></MyControls:MyButton> 
    <MyControls:MyButton Name="btnNo" Content="No" Height="50" Width="50" Margin="2"></MyControls:MyButton> 
    <MyControls:MyButton Name="btnCancel" Content="Cancel" Height="50" Width="50" Margin="2"></MyControls:MyButton> 
</StackPanel> 
 
So thats what I would do in WPF - or in other words what I would do to assign routed events in XAML.
BUT - it does not compile. VS tells me that MyButton does not provide such an "appendable property".

So am I doing something wrong or does this simply mean that your RoutedEvent implementation does not support XAML?

Regards

Manfred

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Valeri Hristov
Telerik team
answered on 21 Apr 2009, 04:04 PM
Hi Manfred,

Unfortunately the Silverlight XAML parser does not allow us to add support for attaching event handlers in XAML and as far I can see, this is the biggest limitation of our routed events implementation.

Kind regards,
Valeri Hristov
the Telerik team

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ManniAT
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answered on 21 Apr 2009, 04:07 PM
Tank you for this information.
It doesn't make me happy (not your fault I know) - but it prevents me from searching.

Regards

Manfred
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