Fix possible exception

  "Exception = 'BadgeScaleTransform' name cannot be found in the name scope of 'System.Windows.Controls.ControlTemplate'."

Author: punker76

MaterialDesignThemes.Wpf/Badged.cs

@@ -1,11 +1,23 @@
-using System.Windows;
+using System;
+using System.Diagnostics;
+using System.Windows;
+using System.Windows.Media.Animation;
 using ControlzEx;
 
 namespace MaterialDesignThemes.Wpf
 {
     [TemplatePart(Name = BadgeContainerPartName, Type = typeof(UIElement))]
     public class Badged : BadgedEx
     {
+        public static readonly DependencyProperty BadgeChangedStoryboardProperty = DependencyProperty.Register(
+            "BadgeChangedStoryboard", typeof(Storyboard), typeof(Badged), new PropertyMetadata(default(Storyboard)));
+
+        public Storyboard BadgeChangedStoryboard
+        {
+            get { return (Storyboard)this.GetValue(BadgeChangedStoryboardProperty); }
+            set { this.SetValue(BadgeChangedStoryboardProperty, value); }
+        }
+
         static Badged()
         {
             DefaultStyleKeyProperty.OverrideMetadata(typeof(Badged), new FrameworkPropertyMetadata(typeof(Badged)));
@@ -19,5 +31,34 @@ public ColorZoneMode BadgeColorZoneMode
             get { return (ColorZoneMode) GetValue(BadgeColorZoneModeProperty); }
             set { SetValue(BadgeColorZoneModeProperty, value); }
         }
+
+        public override void OnApplyTemplate()
+        {
+            this.BadgeChanged -= this.OnBadgeChanged;
+
+            base.OnApplyTemplate();
+
+            this.BadgeChanged += this.OnBadgeChanged;
+        }
+
+        private void OnBadgeChanged(object sender, RoutedPropertyChangedEventArgs<object> e)
+        {
+            var sb = this.BadgeChangedStoryboard;
+            if (this._badgeContainer != null && sb != null)
+            {
+                try
+                {
+                    this._badgeContainer.BeginStoryboard(sb);
+                }
+                catch (Exception exc)
+                {
+                    Trace.WriteLine("Error during Storyboard execution, exception will be rethrown.");
+                    Trace.WriteLine($"{exc.Message} ({exc.GetType().FullName})");
+                    Trace.WriteLine(exc.StackTrace);
+
+                    throw;
+                }
+            }
+        }
     }
 }

MaterialDesignThemes.Wpf/Themes/MaterialDesignTheme.Badged.xaml

@@ -4,13 +4,24 @@
 
     <BooleanToVisibilityConverter x:Key="BooleanToVisibilityConverter" />
     <SineEase EasingMode="EaseOut" x:Key="BadgeEase" />
+    <Storyboard x:Key="BadgeChangedStoryboard">
+        <DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.RenderTransform).(ScaleTransform.ScaleX)">
+            <EasingDoubleKeyFrame KeyTime="0" Value="1.4" />
+            <EasingDoubleKeyFrame EasingFunction="{StaticResource BadgeEase}" KeyTime="0:0:0.3" Value="1" />
+        </DoubleAnimationUsingKeyFrames>
+        <DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.RenderTransform).(ScaleTransform.ScaleY)">
+            <EasingDoubleKeyFrame KeyTime="0" Value="1.4" />
+            <EasingDoubleKeyFrame EasingFunction="{StaticResource BadgeEase}" KeyTime="0:0:0.3" Value="1" />
+        </DoubleAnimationUsingKeyFrames>
+    </Storyboard>
 
     <Style TargetType="{x:Type wpf:Badged}">
         <Setter Property="IsTabStop" Value="False" />
         <Setter Property="HorizontalAlignment" Value="Left" />
         <Setter Property="VerticalAlignment" Value="Top" />
         <Setter Property="BadgeColorZoneMode" Value="PrimaryLight" />
         <Setter Property="BadgePlacementMode" Value="TopRight" />
+        <Setter Property="BadgeChangedStoryboard" Value="{StaticResource BadgeChangedStoryboard}" />
         <Setter Property="Template">
             <Setter.Value>
                 <ControlTemplate TargetType="{x:Type wpf:Badged}">
@@ -42,7 +53,7 @@
                                 </Style>
                             </Border.Resources>
                             <Border.RenderTransform>
-                                <ScaleTransform x:Name="BadgeScaleTransform" ScaleX="1" ScaleY="1" />
+                                <ScaleTransform ScaleX="1" ScaleY="1" />
                             </Border.RenderTransform>
                             <ContentControl Foreground="{TemplateBinding BadgeForeground}"
                                             IsTabStop="False"
@@ -53,22 +64,6 @@
                         </Border>
                     </Grid>
                     <ControlTemplate.Triggers>
-                        <EventTrigger RoutedEvent="BadgeChanged">
-                            <EventTrigger.Actions>
-                                <BeginStoryboard>
-                                    <Storyboard>
-                                        <DoubleAnimationUsingKeyFrames Storyboard.TargetName="BadgeScaleTransform" Storyboard.TargetProperty="ScaleX">
-                                            <EasingDoubleKeyFrame Value="1.4" KeyTime="0" />
-                                            <EasingDoubleKeyFrame Value="1" KeyTime="0:0:0.3" EasingFunction="{StaticResource BadgeEase}" />
-                                        </DoubleAnimationUsingKeyFrames>
-                                        <DoubleAnimationUsingKeyFrames Storyboard.TargetName="BadgeScaleTransform" Storyboard.TargetProperty="ScaleY">
-                                            <EasingDoubleKeyFrame Value="1.4" KeyTime="0" />
-                                            <EasingDoubleKeyFrame Value="1" KeyTime="0:0:0.3" EasingFunction="{StaticResource BadgeEase}" />
-                                        </DoubleAnimationUsingKeyFrames>
-                                    </Storyboard>
-                                </BeginStoryboard>
-                            </EventTrigger.Actions>
-                        </EventTrigger>
                         <Trigger Property="BadgePlacementMode" Value="TopLeft">
                             <Setter TargetName="PART_BadgeContainer" Property="HorizontalAlignment" Value="Left" />
                             <Setter TargetName="PART_BadgeContainer" Property="VerticalAlignment" Value="Top" />