chore: add avalonia DashedRepeatButton demo.

src/Avalonia/HandyControlDemo_Avalonia/UserControl/Styles/RepeatButtonDemoCtl.axaml

@@ -63,6 +63,62 @@
                                       Theme="{StaticResource RepeatButtonDanger}" />
                     </StackPanel>
                 </WrapPanel>
+                <WrapPanel>
+                    <StackPanel>
+                        <RepeatButton Content="default"
+                                Margin="5"
+                                Theme="{StaticResource RepeatButtonDashed}" />
+                        <RepeatButton IsEnabled="False"
+                                Content="default"
+                                Margin="5"
+                                Theme="{StaticResource RepeatButtonDashed}" />
+                    </StackPanel>
+                    <StackPanel>
+                        <RepeatButton Content="primary"
+                                Margin="5"
+                                Theme="{StaticResource RepeatButtonDashedPrimary}" />
+                        <RepeatButton IsEnabled="False"
+                                Content="primary"
+                                Margin="5"
+                                Theme="{StaticResource RepeatButtonDashedPrimary}" />
+                    </StackPanel>
+                    <StackPanel>
+                        <RepeatButton Content="success"
+                                Margin="5"
+                                Theme="{StaticResource RepeatButtonDashedSuccess}" />
+                        <RepeatButton IsEnabled="False"
+                                Content="success"
+                                Margin="5"
+                                Theme="{StaticResource RepeatButtonDashedSuccess}" />
+                    </StackPanel>
+                    <StackPanel>
+                        <RepeatButton Content="info"
+                                Margin="5"
+                                Theme="{StaticResource RepeatButtonDashedInfo}" />
+                        <RepeatButton IsEnabled="False"
+                                Content="info"
+                                Margin="5"
+                                Theme="{StaticResource RepeatButtonDashedInfo}" />
+                    </StackPanel>
+                    <StackPanel>
+                        <RepeatButton Content="warning"
+                                Margin="5"
+                                Theme="{StaticResource RepeatButtonDashedWarning}" />
+                        <RepeatButton IsEnabled="False"
+                                Content="warning"
+                                Margin="5"
+                                Theme="{StaticResource RepeatButtonDashedWarning}" />
+                    </StackPanel>
+                    <StackPanel>
+                        <RepeatButton Content="danger"
+                                Margin="5"
+                                Theme="{StaticResource RepeatButtonDashedDanger}" />
+                        <RepeatButton IsEnabled="False"
+                                Content="danger"
+                                Margin="5"
+                                Theme="{StaticResource RepeatButtonDashedDanger}" />
+                    </StackPanel>
+                </WrapPanel>
             </hc:UniformSpacingPanel>
         </hc:UniformSpacingPanel>
     </ScrollViewer>

src/Avalonia/HandyControl_Avalonia/Themes/Styles/RepeatButton.axaml

@@ -1,5 +1,6 @@
 <ResourceDictionary xmlns="https://github.com/avaloniaui"
-                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
+                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+                    xmlns:hc="https://handyorg.github.io/handycontrol">
     <ControlTheme x:Key="RepeatButtonBaseStyle"
                   TargetType="RepeatButton">
         <Setter Property="Height"
@@ -56,6 +57,32 @@
         </Style>
     </ControlTheme>
 
+    <ControlTheme x:Key="RepeatButtonDashedBaseStyle"
+                  BasedOn="{StaticResource RepeatButtonBaseStyle}"
+                  TargetType="RepeatButton">
+        <Setter Property="Background"
+                Value="Transparent" />
+        <Setter Property="Template">
+            <Setter.Value>
+                <ControlTemplate TargetType="RepeatButton">
+                    <hc:DashedBorder BorderDashArray="3,2"
+                                     BorderThickness="{TemplateBinding BorderThickness}"
+                                     BorderBrush="{TemplateBinding BorderBrush}"
+                                     CornerRadius="{TemplateBinding CornerRadius}">
+                        <ContentPresenter x:Name="PART_ContentPresenter"
+                                          Background="{TemplateBinding Background}"
+                                          Content="{TemplateBinding Content}"
+                                          ContentTemplate="{TemplateBinding ContentTemplate}"
+                                          Padding="{TemplateBinding Padding}"
+                                          RecognizesAccessKey="True"
+                                          HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}"
+                                          VerticalContentAlignment="{TemplateBinding VerticalContentAlignment}" />
+                    </hc:DashedBorder>
+                </ControlTemplate>
+            </Setter.Value>
+        </Setter>
+    </ControlTheme>
+
     <ControlTheme x:Key="RepeatButtonDefault"
                   BasedOn="{StaticResource RepeatButtonBaseStyle}"
                   TargetType="RepeatButton">
@@ -121,4 +148,63 @@
         <Setter Property="BorderBrush"
                 Value="{DynamicResource DangerBrush}" />
     </ControlTheme>
+
+    <ControlTheme x:Key="RepeatButtonDashed"
+                  BasedOn="{StaticResource RepeatButtonDashedBaseStyle}"
+                  TargetType="RepeatButton">
+        <Setter Property="Foreground"
+                Value="{DynamicResource PrimaryTextBrush}" />
+
+        <Style Selector="^:pointerover">
+            <Setter Property="Foreground"
+                    Value="{DynamicResource PrimaryBrush}" />
+            <Setter Property="BorderBrush"
+                    Value="{DynamicResource PrimaryBrush}" />
+        </Style>
+    </ControlTheme>
+
+    <ControlTheme x:Key="RepeatButtonDashedPrimary"
+                  BasedOn="{StaticResource RepeatButtonDashedBaseStyle}"
+                  TargetType="RepeatButton">
+        <Setter Property="Foreground"
+                Value="{DynamicResource PrimaryBrush}" />
+        <Setter Property="BorderBrush"
+                Value="{DynamicResource PrimaryBrush}" />
+    </ControlTheme>
+
+    <ControlTheme x:Key="RepeatButtonDashedSuccess"
+                  BasedOn="{StaticResource RepeatButtonDashedBaseStyle}"
+                  TargetType="RepeatButton">
+        <Setter Property="Foreground"
+                Value="{DynamicResource SuccessBrush}" />
+        <Setter Property="BorderBrush"
+                Value="{DynamicResource SuccessBrush}" />
+    </ControlTheme>
+
+    <ControlTheme x:Key="RepeatButtonDashedInfo"
+                  BasedOn="{StaticResource RepeatButtonDashedBaseStyle}"
+                  TargetType="RepeatButton">
+        <Setter Property="Foreground"
+                Value="{DynamicResource InfoBrush}" />
+        <Setter Property="BorderBrush"
+                Value="{DynamicResource InfoBrush}" />
+    </ControlTheme>
+
+    <ControlTheme x:Key="RepeatButtonDashedWarning"
+                  BasedOn="{StaticResource RepeatButtonDashedBaseStyle}"
+                  TargetType="RepeatButton">
+        <Setter Property="Foreground"
+                Value="{DynamicResource WarningBrush}" />
+        <Setter Property="BorderBrush"
+                Value="{DynamicResource WarningBrush}" />
+    </ControlTheme>
+
+    <ControlTheme x:Key="RepeatButtonDashedDanger"
+                  BasedOn="{StaticResource RepeatButtonDashedBaseStyle}"
+                  TargetType="RepeatButton">
+        <Setter Property="Foreground"
+                Value="{DynamicResource DangerBrush}" />
+        <Setter Property="BorderBrush"
+                Value="{DynamicResource DangerBrush}" />
+    </ControlTheme>
 </ResourceDictionary>