add Watermark

src/Shared/HandyControl_Shared/Themes/Styles/Base/MenuBaseStyle.xaml

@@ -85,7 +85,7 @@
                                     <Setter Property="Visibility" TargetName="Icon" Value="Collapsed"/>
                                 </Trigger>
                                 <Trigger Property="IsHighlighted" Value="True">
-                                    <Setter Property="Background" TargetName="templateRoot" Value="{DynamicResource DarkDefaultBrush}"/>
+                                    <Setter Property="Background" TargetName="templateRoot" Value="{DynamicResource SecondaryRegionBrush}"/>
                                     <Setter Property="TextElement.Foreground" TargetName="menuHeaderContainer" Value="{DynamicResource PrimaryTextBrush}"/>
                                 </Trigger>
                                 <Trigger Property="IsSubmenuOpen" Value="True">
@@ -125,7 +125,7 @@
                                     <Setter Property="Visibility" TargetName="Icon" Value="Collapsed"/>
                                 </Trigger>
                                 <Trigger Property="IsHighlighted" Value="True">
-                                    <Setter Property="Background" TargetName="templateRoot" Value="{DynamicResource DarkDefaultBrush}"/>
+                                    <Setter Property="Background" TargetName="templateRoot" Value="{DynamicResource SecondaryRegionBrush}"/>
                                     <Setter Property="TextElement.Foreground" TargetName="menuHeaderContainer" Value="{DynamicResource PrimaryTextBrush}"/>
                                 </Trigger>
                                 <Trigger Property="IsSubmenuOpen" Value="True">

src/Shared/HandyControl_Shared/Themes/Styles/Base/WatermarkBaseStyle.xaml

@@ -0,0 +1,20 @@
+<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
+                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+                    xmlns:controls="clr-namespace:HandyControl.Controls">
+
+    <Style x:Key="WatermarkBaseStyle" TargetType="controls:Watermark">
+        <Setter Property="MarkBrush" Value="{DynamicResource DarkMaskBrush}"/>
+        <Setter Property="Foreground" Value="{DynamicResource DarkMaskBrush}"/>
+        <Setter Property="Angle" Value="20"/>
+        <Setter Property="Template">
+            <Setter.Value>
+                <ControlTemplate TargetType="controls:Watermark">
+                    <Border Name="PART_Root">
+                        <ContentPresenter/>
+                    </Border>
+                </ControlTemplate>
+            </Setter.Value>
+        </Setter>
+    </Style>
+
+</ResourceDictionary>

src/Shared/HandyControl_Shared/Themes/Styles/Style.xaml

@@ -86,6 +86,7 @@
         <ResourceDictionary Source="Frame.xaml"/>
         <ResourceDictionary Source="BlendEffectBox.xaml"/>
         <ResourceDictionary Source="Screenshot.xaml"/>
+        <ResourceDictionary Source="Watermark.xaml"/>
     </ResourceDictionary.MergedDictionaries>
 
 </ResourceDictionary>

src/Shared/HandyControl_Shared/Themes/Styles/Watermark.xaml

@@ -0,0 +1,10 @@
+<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+                    xmlns:controls="clr-namespace:HandyControl.Controls">
+    
+    <ResourceDictionary.MergedDictionaries>
+        <ResourceDictionary Source="Base/WatermarkBaseStyle.xaml"/>
+    </ResourceDictionary.MergedDictionaries>
+
+    <Style BasedOn="{StaticResource WatermarkBaseStyle}" TargetType="controls:Watermark"/>
+
+</ResourceDictionary>