Насколько я понял, это происходит потому, что RotateTransform не является FrameworkElement.
Обойти это можно использованием присоединённого свойства: ( http://www.sharpgis.net/?tag=/silverlight )
| Код |
public class Arrow : Control
{
static Arrow()
{
DefaultStyleKeyProperty.OverrideMetadata(typeof(Arrow), new FrameworkPropertyMetadata(typeof(Arrow)));
}
public double Angle
{
get { return (double)GetValue(AngleProperty); }
set { SetValue(AngleProperty, value); }
}
public static readonly DependencyProperty AngleProperty =
DependencyProperty.Register("Angle", typeof(double), typeof(Arrow),
new FrameworkPropertyMetadata(0.0) { AffectsRender = true });
public static readonly DependencyProperty AttachedAngleProperty =
DependencyProperty.RegisterAttached("AttachedAngle", typeof(double), typeof(Arrow),
new FrameworkPropertyMetadata(0.0) {PropertyChangedCallback = OnAngleChanged});
public static double GetAttachedAngle(DependencyObject d)
{
return (double)d.GetAttachedValue(AttachedAngleProperty);
}
public static void SetAttachedAngle(DependencyObject d, double value)
{
d.SetValue(AttachedAngleProperty, value);
}
private static void OnAngleChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
if (d is UIElement)
{
UIElement b = d as UIElement;
if (e.NewValue is double)
{
double c = (int)e.NewValue;
if (!double.IsNaN(c))
{
if (b.RenderTransform is RotateTransform)
(b.RenderTransform as RotateTransform).Angle = c;
else
b.RenderTransform = new RotateTransform() { Angle = c };
}
}
}
}
}
|
| Код |
<Style TargetType="{x:Type local:Arrow}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type local:Arrow}">
<Path Fill="{TemplateBinding Background}"
Stroke="{TemplateBinding BorderBrush}"
StrokeThickness="{TemplateBinding BorderThickness}"
Stretch="Fill"
Data="M0 0M20 20M9 10 L10 2 L 11 10A1 1 0 1 1 9 10"
local:Arrow.AttachedAngle="{TemplateBinding Angle}"/>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
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