Now, I found out that I could not bind via the LayoutTransform property on the TreeView itself ("scale {Binding ElementName=slider, Path=Value}" does not compile). Instead, I tried this:
<
TreeView.LayoutTransform><ScaleTransform ScaleX="{Binding ElementName=slider, Path=Value}" />
</TreeView.LayoutTransform>
This time, it was complaining that ScaleX needed a double value, which it was not getting. So I looked into creating a Converter. I made a simple class:
public class Test : IValueConverter { #region IValueConverter Members object IValueConverter.Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture){ return Double.Parse(value);} object IValueConverter.ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture){ return value.ToString();} #endregion } |
Then added this to the top of my XAML:
<
Mapping XmlNamespace="T" ClrNamespace="AvalonApplication5" >Added this to my Window:
xmlns:T="T"
And this into my TreeView:
<
TreeView.Resources><
T:Test x:Key="Conv" /></
TreeView.Resources>And changed my ScaleX to this:
ScaleX
="{Binding ElementName=slider, Path=Value, Converter={StaticResource Conv}}"Now, when I try to run, it tells me:
Cannot locate the resource 'window1.baml'.
Does anyone know of an easier way to do this
Thanks,
Johann
Bind Scale to Slider
Allen Clark MSFT
Thanks! That fixed the baml file problem. Now, however, whenever I run I get the error:
Value cannot be null.
Parameter name: d
I've set breakpoints on my IValueConverter but they never get called.
GPAustralia
There are some issues binding to Freezables in September CTP, and you've just run into one of them. This has been fixed in more recent bits though.
HgEuAaVrEdN
Almost there! Now I get this:
Object of type 'System.Object' cannot be converted to type 'System.ComponentModel.IValueConverter'.
There's also another problem. In my XAML, my line:
<T:Test x:Key="Conv" />
Has a blue line underneath and it warning me:
The element 'TreeView.Resources' in namespace 'http://schemas.microsoft.com/winfx/avalon/2005' has invalid child element 'Test' in namespace 'T'. Expected 'ResourceDictionary.MergedDictionaries, ResourceDictionary.Keys, ResourceDictionary.Values' in namespace 'http://schemas.microsoft.com/winfx/avalon/2005' as well as 'Code' in namespace 'http://schemas.microsoft.com/winfx/xaml/2005' as well as 'Point, Size, Vector, Rect, Int32Rect, FontStyle, FontStretch, FontWeight, Duration, KeyTime, RepeatBehavior, Color, PixelFormat, Matrix3D, Point3D, Point4D, Quaternion, Rect3D, Size3D, Vector3D, CornerRadius, FigureLength, GridLength, Thickness, DependencyProperty, DependencyObject, TextDecoration, TextDecorationCollection, DoubleAnimationUsingPath, DoubleAnimation, DoubleAnimationUsingKeyFrames, MatrixAnimationUsingPath, MatrixAnimationUsingKeyFrames, PointAnimationUsingPath, PointAnimation, PointAnimationUsingKeyFrames, ByteAnimation, ByteAnimationUsingKeyFrames, ColorAnimation, ColorAnimationUsingKeyFrames, DecimalAnimation, DecimalAnimationUsingKeyFrames, Int16Animation, Int16AnimationUsingKeyFrames, Int32Animation, Int32AnimationUsingKeyFrames, Int64Animation, I....
Am I defining my Converter correctly
GERT86
To implement Fil's (excellent!!) workaround, you could do the following:
<Window.Resources>
(...)
<src:DoubleToScaleTransformConverter x:Key="converter"/>
</Window.Resources>
<TreeView
LayoutTransform="{Binding ElementName=slider, Path=Value, Converter={StaticResource converter}}" (...)>(...)</TreeView><Slider Value="1" Minimum="1" Maximum="10" Name="slider"/>
The item passed as a parameter to the Convert method in the converter is of type double because you are binding to the slider's Value (which is of type double). The object returned from the Converter method should be the ScaleTransform because that's the object you want to assign to the LayoutTransform property of TreeView.
public class DoubleToScaleTransformConverter : IValueConverter
{ public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
ScaleTransform transform = new ScaleTransform();
transform.ScaleX = (double)value;
return transform;
} (...)
}
I made a little sample for you to play with, which you can find here:
http://www.beacosta.com/Forum/BindScaleTransformToSlider.zip
Let us know if this helped and if you have any further questions.
Bea
cyberkid1043
The markup would look something like this:
<TreeView LayoutTransform="{Binding ElementName=slider, Path=Value, Converter={StaticResource Conv}}" />
Make sure your value converter returns a ScaleTransform instead of a Double now.
xfiles