Question

In the code below, I want to start the animation when there’s TextChanged() event of TextBlock is called. But when I try this code, I get an error…

“Failed to assign to property ‘System.Windows.EventTrigger.RoutedEvent'”

I am lost, could someone please assist me that how can I do this?

<StackPanel>
   <ListBox Name"lstSample" SelectionChanged="lstSample_SelectionChanged">
       <ListBox.Triggers>
          <EventTrigger RoutedEvent="ListBox.SelectionChanged">
              <BeginStoryboard>
                  <BeginStoryboard.Storyboard>
                      <Storyboard>
                         <DoubleAnimation Storyboard.TargetName="txtSample" Storyboard.TargetProperty="Opacity" From="0" To="1" Duration="0:0:1.0">
                              <DoubleAnimation.EasingFunction>
                                  <PowerEase EasingMode="EaseIn" Power="8"/>
                              </DoubleAnimation.EasingFunction>
                          </DoubleAnimation>
                      </Storyboard>
                  </BeginStoryboard.Storyboard>
              </BeginStoryboard>
          </EventTrigger>
       </ListBoxTriggers>
   </ListBox>

   <Border Name="brdrTextSampleLanguageOne" BorderThickness="0" BorderBrush="{StaticResource PhoneAccentBrush}">
      <TextBlock 
             Text="This is sample text." 
             Name="txtSample" 
             TextAlignment="Right" 
             VerticalAlignment="Center" />

    </Border>
</StackPanel>

Thanks very much.

Answer 1

Would be really easy using code, just create a property like:

 private string _textBlockText;
        public string textBlockText
        {
            get { return _textBlockText; }
            set
            {
                if (txtSample.Text != value)
                {
                    if (Storyboard1.GetCurrentState() != ClockState.Active)
                        Storyboard1.Begin();
                    txtSample.Text = value;
                }
            }
        }

Just use textBlockText property to update text in anywhere in your code and this should work like TextChanged event… Note: Storyboard1 is the animation you desire to play on TextChanged Event.