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9.2

Binding to an element in generic.xaml template

Asked by ward459 in WPF and Silverlight

Tags: silverlight xaml dependencyproperty binding

I have a dependency property name "myTop" and debug shows that it is working as expected. I need to bind this value to the "To" property of a DoubleAnimation. I have tried {TemplateBinding myTop} which doesn't produce visible errors; HOWEVER, the animation doesn't play. By replacing the TemplateBinding value with a constant it works as expected.

I have also tried the following as shown in the code snippet below:
{Binding Path=myTop, Mode="OneWay", Source="local:myClassname"}

But this results in a XamlParseException =
"AG_E_PARSER_BAD_PROPERTY_VALUE [Line: 2 Position: 65]"

I've spent many hours trying to resolve this but haven't found an answer. Any help is appreciated.

View the Solution FREE for 30 Days

         
           
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             Applicable code snippets.  
 
public class ProgressBar1 : Control
{
}
 
public static DependencyProperty StatusTopProperty =
       DependencyProperty.Register("StatusTop", typeof(double), 
                                                                              typeof(ProgressBar1), 
                                                                              new PropertyMetadata(null));
		
public double StatusTop
{
	get { return (double)this.GetValue(StatusTopProperty); }
	set { this.SetValue(StatusTopProperty, value); }
}
	 
public override void OnApplyTemplate()
{
      base.OnApplyTemplate();
       _templateRootElement = GetTemplateChild(strTemplateRoot) as FrameworkElement;
       VisualStateManager.GoToState(this, "Move", false);
} 
 
XAML inside control template, root element is a Canvas.  This works when using a hard-coded constant value for the To property (i.e. 150)
 
                <VisualStateManager.VisualStateGroups>
			<VisualStateGroup x:Name="vsgProgressRegion">
				<VisualState x:Name="Move">
					<Storyboard x:Name="sbMovePointer">
						<DoubleAnimation x:Name="daMovePointer" 
							From="285" 
                                                        To="{Binding Path=StatusTop, Mode=OneWay,         
                                                                                               Source=local:ProgressBar1}"
							Storyboard.TargetName="climber" 
							Storyboard.TargetProperty="(Canvas.Top)">
						</DoubleAnimation>									
					</Storyboard>
				</VisualState>
			</VisualStateGroup>
		</VisualStateManager.VisualStateGroups>
Applicable code snippets 
 
public static DependencyProperty StatusTopProperty =
       DependencyProperty.Register("StatusTop", typeof(double), 
                                                                              typeof(ProgressBar1), 
                                                                              new PropertyMetadata(null));
		
public double StatusTop
{
	get { return (double)this.GetValue(StatusTopProperty); }
	set { this.SetValue(StatusTopProperty, value); }
}
	 
public override void OnApplyTemplate()
{
      base.OnApplyTemplate();
       _templateRootElement = GetTemplateChild(strTemplateRoot) as FrameworkElement;
       VisualStateManager.GoToState(this, "Move", false);
} 
 
XAML inside control template, root element is a Canvas.  This works when using a hard-coded constant value for the To property (i.e. 150) 
 
<VisualStateManager.VisualStateGroups>
	<VisualStateGroup x:Name="vsgProgressRegion">
		<VisualState x:Name="Move">
			<Storyboard x:Name="sbMovePointer">
				<DoubleAnimation x:Name="daMovePointer" 
					From="285" 
                                        To="{Binding Path=StatusTop, Mode=OneWay,         
                                        Source=local:ProgressBar1}"
					Storyboard.TargetName="climber" 
					Storyboard.TargetProperty="(Canvas.Top)">
				</DoubleAnimation>								
			</Storyboard>
		</VisualState>
	</VisualStateGroup>
</VisualStateManager.VisualStateGroups>

           
         

20091118-EE-VQP-93 - Hierarchy / EE_QW_3_20080625

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Binding to an element in generic.xaml template

Asked by ward459 in WPF and Silverlight

Tags: silverlight xaml dependencyproperty binding

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