How to make a WPF TextBlock spin whenever its value updates?

Question

I'm trying to spin a TextBlock 360 degrees whenever it's binding updates.

From everything I've read the following should work, however it doesn't have any effect. What am I doing wrong?

<TextBlock VerticalAlignment="Center" Text="{Binding Total, NotifyOnTargetUpdated=True}">

    <TextBlock.RenderTransform>
        <RotateTransform x:Name="TotalSpinTransform" Angle="0"/>
    </TextBlock.RenderTransform>

    <TextBlock.Triggers>
        <EventTrigger RoutedEvent="Binding.TargetUpdated">
            <EventTrigger.EnterActions>
                <BeginStoryboard>
                    <Storyboard>
                        <DoubleAnimation Storyboard.TargetProperty="(TextBlock.RenderTransform).(RotateTransform.Angle)" 
                            From="0" To="360" Duration="0:0:0.2" AutoReverse="True"/>
                    </Storyboard>
                </BeginStoryboard>
            </EventTrigger.EnterActions>
        </EventTrigger>
    </TextBlock.Triggers>

</TextBlock>

Do you see warnings in the output window when it runs? – RQDQ Mar 04 '11 at 18:05 — RQDQ, Mar 04 '11 at 18:05

score 4 · Accepted Answer · edited Sep 28 '11 at 00:39

4

Neither EnterActions nor ExitActions are applicable to EventTrigger. Unfortunately, these properties are defined on TriggerBase so they are present on an EventTrigger. Try this:

    <EventTrigger RoutedEvent="Binding.TargetUpdated">
            <BeginStoryboard>
                <Storyboard>
                    <DoubleAnimation Storyboard.TargetProperty="(TextBlock.RenderTransform).(RotateTransform.Angle)" 
                        From="0" To="360" Duration="0:0:0.2" AutoReverse="True"/>
                </Storyboard>
            </BeginStoryboard>
    </EventTrigger>

edited Sep 28 '11 at 00:39

answered Mar 04 '11 at 20:02

Kent Boogaart

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Ha... I didn't even notice it was EnterAction... I just assumed Action (which is what I had in my solution) and mocked up a sample by putting it in a style instead. Good call though! – Scott Mar 04 '11 at 20:30

How to make a WPF TextBlock spin whenever its value updates?

1 Answers1