From c2bce7c91268d21f08474ab5396c3df2e4d40b5c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E8=89=BE=E7=AB=B9?= <akwkevin@126.com>
Date: Sat, 23 Dec 2023 10:14:08 +0800
Subject: [PATCH] =?UTF-8?q?=E8=87=AA=E5=AE=9A=E4=B9=89=E5=B7=A5=E5=85=B7?=
 =?UTF-8?q?=E6=A0=8F=E8=BF=9E=E6=8E=A5=E7=BA=BF=E6=98=BE=E7=A4=BA?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../Views/ToolBoxControl.xaml                 | 721 +++++++++---------
 .../BaseViewModel/SelectableViewModelBase.cs  |   8 +
 2 files changed, 378 insertions(+), 351 deletions(-)

diff --git a/AIStudio.Wpf.DiagramApp/Views/ToolBoxControl.xaml b/AIStudio.Wpf.DiagramApp/Views/ToolBoxControl.xaml
index f36f9fd..69ad5ae 100644
--- a/AIStudio.Wpf.DiagramApp/Views/ToolBoxControl.xaml
+++ b/AIStudio.Wpf.DiagramApp/Views/ToolBoxControl.xaml
@@ -21,365 +21,384 @@
              d:DesignHeight="300" d:DesignWidth="300">
     <UserControl.Resources>
         <ResourceDictionary>
-            <conventer:StringPathConverter x:Key="stringPathConverter"/>
-            <conventer:IntVisibilityConverter x:Key="IntVisibilityConverter"/>
-            <BooleanToVisibilityConverter x:Key="BooleanToVisibilityConverter"/>
-            <dd:EnumDescriptionConverter x:Key="EnumDescriptionConverter"/>
-            <command:CommandReference x:Key="DeleteItemCommandReference" Command="{Binding ToolBoxViewModel.DeleteItemCommand}"/>
-            <dd:MathConverter x:Key="MathAddConverter" Operation="Add" />
+            <ResourceDictionary.MergedDictionaries>
+                <ResourceDictionary>
+                    <conventer:StringPathConverter x:Key="stringPathConverter"/>
+                    <conventer:IntVisibilityConverter x:Key="IntVisibilityConverter"/>
+                    <BooleanToVisibilityConverter x:Key="BooleanToVisibilityConverter"/>
+                    <dd:EnumDescriptionConverter x:Key="EnumDescriptionConverter"/>
+                    <command:CommandReference x:Key="DeleteItemCommandReference" Command="{Binding ToolBoxViewModel.DeleteItemCommand}"/>
+                    <dd:MathConverter x:Key="MathAddConverter" Operation="Add" />
+      
 
-            <DataTemplate DataType="{x:Type model:ImageToolBoxData}">
-                <Grid Width="{Binding Width}" Height="{Binding Height}" ToolTip="{Binding Description}">
-                    <Rectangle Name="Border"
-                                   StrokeThickness="1"
-                                   StrokeDashArray="2"
-                                   Fill="Transparent"
-                                   SnapsToDevicePixels="true"/>
-                    <Image IsHitTestVisible="True"
-                                       Stretch="Fill"
-                                       Margin="2"
-                                       Source="{Binding Icon, Converter={x:Static dd:ImageUrlConverter.Instance}}" />
-                </Grid>
-                <DataTemplate.Triggers>
-                    <Trigger Property="IsMouseOver" Value="true">
-                        <Setter TargetName="Border" Property="Stroke" Value="Gray"/>
-                    </Trigger>
-                </DataTemplate.Triggers>
-            </DataTemplate>
-            <DataTemplate DataType="{x:Type model:MediaToolBoxData}">
-                <Grid Width="{Binding Width}" Height="{Binding Height}" ToolTip="{Binding Description}">
-                    <Rectangle Name="Border"
-                                   StrokeThickness="1"
-                                   StrokeDashArray="2"
-                                   Fill="Transparent"
-                                   SnapsToDevicePixels="true"/>
-                    <Image IsHitTestVisible="True"
-                                       Stretch="Fill"
-                                       Margin="2"
-                                       Source="{Binding Text, Converter={x:Static dd:ImageUrlConverter.Instance}}" />
-                </Grid>
-                <DataTemplate.Triggers>
-                    <Trigger Property="IsMouseOver" Value="true">
-                        <Setter TargetName="Border" Property="Stroke" Value="Gray"/>
-                    </Trigger>
-                </DataTemplate.Triggers>
-            </DataTemplate>
-            <DataTemplate DataType="{x:Type model:TextToolBoxData}">
-                <Grid Width="{Binding Width}" Height="{Binding Height}" ToolTip="{Binding Description}">
-                    <Rectangle Name="Border"
-                                   StrokeThickness="1"
-                                   StrokeDashArray="2"
-                                   Fill="Transparent"
-                                   SnapsToDevicePixels="true"/>
-                    <Rectangle Fill="{Binding ColorViewModel.FillColor,Converter={StaticResource ColorBrushConverter}}" Margin="2"/>
-                    <TextBlock Text="{Binding Text}" FontSize="11" HorizontalAlignment="Center" VerticalAlignment="Center"/>
-                </Grid>
-                <DataTemplate.Triggers>
-                    <Trigger Property="IsMouseOver" Value="true">
-                        <Setter TargetName="Border" Property="Stroke" Value="Gray"/>
-                    </Trigger>
-                </DataTemplate.Triggers>
-            </DataTemplate>
-            <DataTemplate DataType="{x:Type model:EllipseTextToolBoxData}">
-                <Grid Width="{Binding Width}" Height="{Binding Height}" ToolTip="{Binding Description}">
-                    <Ellipse Name="Border"
-                                   StrokeThickness="1"
-                                   StrokeDashArray="2"
-                                   Fill="Transparent"
-                                   SnapsToDevicePixels="true"/>
-                    <Ellipse Fill="{Binding ColorViewModel.FillColor,Converter={StaticResource ColorBrushConverter}}" Margin="2"/>
-                    <TextBlock Text="{Binding Text}" FontSize="11" HorizontalAlignment="Center" VerticalAlignment="Center"/>
-                </Grid>
-                <DataTemplate.Triggers>
-                    <Trigger Property="IsMouseOver" Value="true">
-                        <Setter TargetName="Border" Property="Stroke" Value="Gray"/>
-                    </Trigger>
-                </DataTemplate.Triggers>
-            </DataTemplate>
-            <DataTemplate DataType="{x:Type model:PathToolBoxData}">
-                <Grid Width="{Binding Width}" Height="{Binding Height}" ToolTip="{Binding Description}">
-                    <Rectangle Name="Border"
-                                   StrokeThickness="1"
-                                   StrokeDashArray="2"
-                                   Fill="Transparent"
-                                   SnapsToDevicePixels="true"/>
-                    <Path Style="{StaticResource PathItemStyle}" ToolTip="Document" Margin="2"/>
-                </Grid>
-                <DataTemplate.Triggers>
-                    <Trigger Property="IsMouseOver" Value="true">
-                        <Setter TargetName="Border" Property="Stroke" Value="Gray"/>
-                    </Trigger>
-                </DataTemplate.Triggers>
-            </DataTemplate>
-            <DataTemplate DataType="{x:Type model:SvgToolBoxData}">
-                <Grid Width="{Binding Width}" Height="{Binding Height}" ToolTip="{Binding Description}">
-                    <Rectangle Name="Border"
-                                   StrokeThickness="1"
-                                   StrokeDashArray="2"
-                                   Fill="Transparent"
-                                   SnapsToDevicePixels="true"/>
-                    <svg:PackSvg Width="Auto" Height="Auto" Path="{Binding Icon}" Fill="{Binding ColorViewModel.FillColor,Converter={StaticResource ColorBrushConverter}}"/>
-                </Grid>
-                <DataTemplate.Triggers>
-                    <Trigger Property="IsMouseOver" Value="true">
-                        <Setter TargetName="Border" Property="Stroke" Value="Gray"/>
-                    </Trigger>
-                </DataTemplate.Triggers>
-            </DataTemplate>
-            <DataTemplate DataType="{x:Type model:DesignerItemToolBoxData}">
-                <Grid Width="{Binding Width}" Height="{Binding Height}" ToolTip="{Binding Description}">
-                    <Grid.ContextMenu>
-                        <ContextMenu>
-                            <MenuItem Header="删除" Command="{StaticResource DeleteItemCommandReference}" CommandParameter="{Binding .}"/>
-                        </ContextMenu>
-                    </Grid.ContextMenu>
-                    <Rectangle Name="Border"
-                                   StrokeThickness="1"
-                                   StrokeDashArray="2"
-                                   Fill="Transparent"
-                                   SnapsToDevicePixels="true"/>
-                    <Viewbox Stretch="Uniform" DataContext="{Binding DesignerItemViewModel}" Margin="2">
-                        <Grid  Width="{Binding ItemWidth}" Height="{Binding ItemHeight}" IsHitTestVisible="False">
-                            <ContentControl Content="{Binding .}" />
-                            <TextBox Text="{Binding Text}" 
-                                       IsReadOnly="True"
-                                       TextWrapping="Wrap"
-                                       Background ="Transparent"
-                                       BorderThickness="0"
-                                       Margin="5" 
-                                       Foreground="{Binding FontViewModel.FontColor,Converter={StaticResource ColorBrushConverter}}"
-                                       FontSize="{Binding FontViewModel.FontSize}" 
-                                       FontFamily="{Binding FontViewModel.FontFamily}"  
-                                       FontWeight="{Binding FontViewModel.FontWeight}"
-                                       FontStyle="{Binding FontViewModel.FontStyle}"                         
-                                       FontStretch="{Binding FontViewModel.FontStretch}"
-                                       TextDecorations="{Binding FontViewModel.TextDecorations}"
-                                       HorizontalContentAlignment="{Binding FontViewModel.HorizontalAlignment}"
-                                       VerticalContentAlignment="{Binding FontViewModel.VerticalAlignment}"
-                                       TextBlock.LineHeight="{Binding FontViewModel.LineHeight}"/>
+                    <DataTemplate DataType="{x:Type model:ImageToolBoxData}">
+                        <Grid Width="{Binding Width}" Height="{Binding Height}" ToolTip="{Binding Description}">
+                            <Rectangle Name="Border"
+                            StrokeThickness="1"
+                            StrokeDashArray="2"
+                            Fill="Transparent"
+                            SnapsToDevicePixels="true"/>
+                            <Image IsHitTestVisible="True"
+                                Stretch="Fill"
+                                Margin="2"
+                                Source="{Binding Icon, Converter={x:Static dd:ImageUrlConverter.Instance}}" />
                         </Grid>
-                    </Viewbox>
+                        <DataTemplate.Triggers>
+                            <Trigger Property="IsMouseOver" Value="true">
+                                <Setter TargetName="Border" Property="Stroke" Value="Gray"/>
+                            </Trigger>
+                        </DataTemplate.Triggers>
+                    </DataTemplate>
+                    <DataTemplate DataType="{x:Type model:MediaToolBoxData}">
+                        <Grid Width="{Binding Width}" Height="{Binding Height}" ToolTip="{Binding Description}">
+                            <Rectangle Name="Border"
+                            StrokeThickness="1"
+                            StrokeDashArray="2"
+                            Fill="Transparent"
+                            SnapsToDevicePixels="true"/>
+                            <Image IsHitTestVisible="True"
+                                Stretch="Fill"
+                                Margin="2"
+                                Source="{Binding Text, Converter={x:Static dd:ImageUrlConverter.Instance}}" />
+                        </Grid>
+                        <DataTemplate.Triggers>
+                            <Trigger Property="IsMouseOver" Value="true">
+                                <Setter TargetName="Border" Property="Stroke" Value="Gray"/>
+                            </Trigger>
+                        </DataTemplate.Triggers>
+                    </DataTemplate>
+                    <DataTemplate DataType="{x:Type model:TextToolBoxData}">
+                        <Grid Width="{Binding Width}" Height="{Binding Height}" ToolTip="{Binding Description}">
+                            <Rectangle Name="Border"
+                            StrokeThickness="1"
+                            StrokeDashArray="2"
+                            Fill="Transparent"
+                            SnapsToDevicePixels="true"/>
+                            <Rectangle Fill="{Binding ColorViewModel.FillColor,Converter={StaticResource ColorBrushConverter}}" Margin="2"/>
+                            <TextBlock Text="{Binding Text}" FontSize="11" HorizontalAlignment="Center" VerticalAlignment="Center"/>
+                        </Grid>
+                        <DataTemplate.Triggers>
+                            <Trigger Property="IsMouseOver" Value="true">
+                                <Setter TargetName="Border" Property="Stroke" Value="Gray"/>
+                            </Trigger>
+                        </DataTemplate.Triggers>
+                    </DataTemplate>
+                    <DataTemplate DataType="{x:Type model:EllipseTextToolBoxData}">
+                        <Grid Width="{Binding Width}" Height="{Binding Height}" ToolTip="{Binding Description}">
+                            <Ellipse Name="Border"
+                            StrokeThickness="1"
+                            StrokeDashArray="2"
+                            Fill="Transparent"
+                            SnapsToDevicePixels="true"/>
+                            <Ellipse Fill="{Binding ColorViewModel.FillColor,Converter={StaticResource ColorBrushConverter}}" Margin="2"/>
+                            <TextBlock Text="{Binding Text}" FontSize="11" HorizontalAlignment="Center" VerticalAlignment="Center"/>
+                        </Grid>
+                        <DataTemplate.Triggers>
+                            <Trigger Property="IsMouseOver" Value="true">
+                                <Setter TargetName="Border" Property="Stroke" Value="Gray"/>
+                            </Trigger>
+                        </DataTemplate.Triggers>
+                    </DataTemplate>
+                    <DataTemplate DataType="{x:Type model:PathToolBoxData}">
+                        <Grid Width="{Binding Width}" Height="{Binding Height}" ToolTip="{Binding Description}">
+                            <Rectangle Name="Border"
+                            StrokeThickness="1"
+                            StrokeDashArray="2"
+                            Fill="Transparent"
+                            SnapsToDevicePixels="true"/>
+                            <Path Style="{StaticResource PathItemStyle}" ToolTip="Document" Margin="2"/>
+                        </Grid>
+                        <DataTemplate.Triggers>
+                            <Trigger Property="IsMouseOver" Value="true">
+                                <Setter TargetName="Border" Property="Stroke" Value="Gray"/>
+                            </Trigger>
+                        </DataTemplate.Triggers>
+                    </DataTemplate>
+                    <DataTemplate DataType="{x:Type model:SvgToolBoxData}">
+                        <Grid Width="{Binding Width}" Height="{Binding Height}" ToolTip="{Binding Description}">
+                            <Rectangle Name="Border"
+                            StrokeThickness="1"
+                            StrokeDashArray="2"
+                            Fill="Transparent"
+                            SnapsToDevicePixels="true"/>
+                            <svg:PackSvg Width="Auto" Height="Auto" Path="{Binding Icon}" Fill="{Binding ColorViewModel.FillColor,Converter={StaticResource ColorBrushConverter}}"/>
+                        </Grid>
+                        <DataTemplate.Triggers>
+                            <Trigger Property="IsMouseOver" Value="true">
+                                <Setter TargetName="Border" Property="Stroke" Value="Gray"/>
+                            </Trigger>
+                        </DataTemplate.Triggers>
+                    </DataTemplate>
+                    <DataTemplate DataType="{x:Type model:DesignerItemToolBoxData}">
+                        <Grid Width="{Binding Width}" Height="{Binding Height}" ToolTip="{Binding Description}">
+                            <Grid.ContextMenu>
+                                <ContextMenu>
+                                    <MenuItem Header="删除" Command="{StaticResource DeleteItemCommandReference}" CommandParameter="{Binding .}"/>
+                                </ContextMenu>
+                            </Grid.ContextMenu>
+                            <Rectangle Name="Border"
+                            StrokeThickness="1"
+                            StrokeDashArray="2"
+                            Fill="Transparent"
+                            SnapsToDevicePixels="true"/>
+                            <Viewbox Stretch="Uniform" DataContext="{Binding DesignerItemViewModel}" Margin="2">
+                                <Grid  Width="{Binding ItemWidth}" Height="{Binding ItemHeight}" IsHitTestVisible="False">
+                                    <ContentControl Content="{Binding .}" />
+                                    <TextBox Text="{Binding Text}" 
+                                IsReadOnly="True"
+                                TextWrapping="Wrap"
+                                Background ="Transparent"
+                                BorderThickness="0"
+                                Margin="5" 
+                                Foreground="{Binding FontViewModel.FontColor,Converter={StaticResource ColorBrushConverter}}"
+                                FontSize="{Binding FontViewModel.FontSize}" 
+                                FontFamily="{Binding FontViewModel.FontFamily}"  
+                                FontWeight="{Binding FontViewModel.FontWeight}"
+                                FontStyle="{Binding FontViewModel.FontStyle}"                         
+                                FontStretch="{Binding FontViewModel.FontStretch}"
+                                TextDecorations="{Binding FontViewModel.TextDecorations}"
+                                HorizontalContentAlignment="{Binding FontViewModel.HorizontalAlignment}"
+                                VerticalContentAlignment="{Binding FontViewModel.VerticalAlignment}"
+                                TextBlock.LineHeight="{Binding FontViewModel.LineHeight}"/>
+                                </Grid>
+                            </Viewbox>
 
-                </Grid>
-                <DataTemplate.Triggers>
-                    <Trigger Property="IsMouseOver" Value="true">
-                        <Setter TargetName="Border" Property="Stroke" Value="Gray"/>
-                    </Trigger>
-                </DataTemplate.Triggers>
-            </DataTemplate>
-            <DataTemplate DataType="{x:Type model:MultipleDesignerItemToolBoxData}">
-                <Grid Width="{Binding Width}" Height="{Binding Height}" ToolTip="{Binding Description}">
-                    <Grid.ContextMenu>
-                        <ContextMenu>
-                            <MenuItem Header="删除" Command="{StaticResource DeleteItemCommandReference}" CommandParameter="{Binding .}"/>
-                        </ContextMenu>
-                    </Grid.ContextMenu>
-                    <Rectangle Name="Border"
-                                   StrokeThickness="1"
-                                   StrokeDashArray="2"
-                                   Fill="Transparent"
-                                   SnapsToDevicePixels="true"/>
-                    <Viewbox Stretch="Uniform" Margin="2">
-                        <ItemsControl ItemsSource="{Binding SelectableDesignerItemViewModels}" 
-                                      Width="{Binding CanvasWidth}"
-                                      Height="{Binding CanvasHeight}">
-                            <ItemsControl.ItemsPanel>
-                                <ItemsPanelTemplate>
-                                    <Canvas x:Name="rootCanvas"/>
-                                </ItemsPanelTemplate>
-                            </ItemsControl.ItemsPanel>
-                            <ItemsControl.Template>
-                                <ControlTemplate TargetType="{x:Type ItemsControl}">
-                                    <Grid>
-                                        <Border BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" Padding="{TemplateBinding Padding}" SnapsToDevicePixels="true">
-                                            <ItemsPresenter SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/>
-                                        </Border>
-                                    </Grid>
-                                </ControlTemplate>
-                            </ItemsControl.Template>
-                            <ItemsControl.ItemTemplate>
-                                <DataTemplate>
-                                    <Grid  Width="{Binding ItemWidth}" Height="{Binding ItemHeight}" IsHitTestVisible="False">
-                                        <ContentControl Content="{Binding .}" Margin="2"/>
-                                    </Grid>
-                                </DataTemplate>
-                            </ItemsControl.ItemTemplate>
-                            <ItemsControl.Resources>
-                                <Style TargetType="{x:Type ContentPresenter}">
-                                    <Setter Property="Canvas.Left" Value="{Binding Left}" />
-                                    <Setter Property="Canvas.Top" Value="{Binding Top}" />
-                                </Style>
-                            </ItemsControl.Resources>
-                        </ItemsControl>
-                    </Viewbox>
+                        </Grid>
+                        <DataTemplate.Triggers>
+                            <Trigger Property="IsMouseOver" Value="true">
+                                <Setter TargetName="Border" Property="Stroke" Value="Gray"/>
+                            </Trigger>
+                        </DataTemplate.Triggers>
+                    </DataTemplate>
+                    <DataTemplate DataType="{x:Type model:MultipleDesignerItemToolBoxData}">
+                        <Grid Width="{Binding Width}" Height="{Binding Height}" ToolTip="{Binding Description}">
+                            <Grid.ContextMenu>
+                                <ContextMenu>
+                                    <MenuItem Header="删除" Command="{StaticResource DeleteItemCommandReference}" CommandParameter="{Binding .}"/>
+                                </ContextMenu>
+                            </Grid.ContextMenu>
+                            <Rectangle Name="Border"
+                            StrokeThickness="1"
+                            StrokeDashArray="2"
+                            Fill="Transparent"
+                            SnapsToDevicePixels="true"/>
+                            <Viewbox Stretch="Uniform" Margin="2">
+                                <ItemsControl ItemsSource="{Binding SelectableDesignerItemViewModels}" 
+              Width="{Binding CanvasWidth}"
+              Height="{Binding CanvasHeight}">
+                                    <ItemsControl.ItemsPanel>
+                                        <ItemsPanelTemplate>
+                                            <Canvas x:Name="rootCanvas"/>
+                                        </ItemsPanelTemplate>
+                                    </ItemsControl.ItemsPanel>
+                                    <ItemsControl.Template>
+                                        <ControlTemplate TargetType="{x:Type ItemsControl}">
+                                            <Grid>
+                                                <Border BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" Padding="{TemplateBinding Padding}" SnapsToDevicePixels="true">
+                                                    <ItemsPresenter SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/>
+                                                </Border>
+                                            </Grid>
+                                        </ControlTemplate>
+                                    </ItemsControl.Template>
+                                    <ItemsControl.ItemTemplate>
+                                        <DataTemplate>
+                                            <Grid  Width="{Binding ItemWidth}" Height="{Binding ItemHeight}" IsHitTestVisible="False">
+                                                <ContentControl Content="{Binding .}" Margin="2"/>
+                                            </Grid>
+                                        </DataTemplate>
+                                    </ItemsControl.ItemTemplate>
+                                    <ItemsControl.ItemContainerStyle>
+                                        <Style>
+                                            <Setter Property="Canvas.Left" Value="{Binding Left}" />
+                                            <Setter Property="Canvas.Top" Value="{Binding Top}" />
+                                            <Style.Triggers>
+                                                <DataTrigger Binding="{Binding IsConnection}" Value="True">
+                                                    <Setter Property="Canvas.Left" Value="{Binding Area.Left}" />
+                                                    <Setter Property="Canvas.Top" Value="{Binding Area.Top}" />
+                                                </DataTrigger>
+                                            </Style.Triggers>
+                                        </Style>
+                                    </ItemsControl.ItemContainerStyle>
+                                    <ItemsControl.Resources>
+                                        <DataTemplate DataType="{x:Type dd:ConnectionViewModel}">
+                                            <Grid>
+                                                <dd:LineControl x:Name="line"/>
+                                            </Grid>
+                                        </DataTemplate>
+                                    </ItemsControl.Resources>
+                                </ItemsControl>
+                            </Viewbox>
 
-                </Grid>
-                <DataTemplate.Triggers>
-                    <Trigger Property="IsMouseOver" Value="true">
-                        <Setter TargetName="Border" Property="Stroke" Value="Gray"/>
-                    </Trigger>
-                </DataTemplate.Triggers>
-            </DataTemplate>
-            <DataTemplate DataType="{x:Type flowchartmodel:FlowchartToolBoxData}">
-                <Grid Width="{Binding Width}" Height="{Binding Height}" ToolTip="{Binding Description}">
-                    <Rectangle Name="Border"
-                                   StrokeThickness="1"
-                                   StrokeDashArray="2"
-                                   Fill="Transparent"
-                                   SnapsToDevicePixels="true"/>
-                    <Grid IsHitTestVisible="False">
-                        <ContentControl Style="{StaticResource CustomFlowNodeStyle}" Margin="2"/>
-                        <TextBlock Text="{Binding Text}" Margin="5" TextWrapping="WrapWithOverflow" FontSize="9" Foreground="{Binding ColorViewModel.LineColor,Converter={StaticResource ColorBrushConverter}}" HorizontalAlignment="Center" VerticalAlignment="Center"/>
-                    </Grid>
-                </Grid>
-                <DataTemplate.Triggers>
-                    <Trigger Property="IsMouseOver" Value="true">
-                        <Setter TargetName="Border" Property="Stroke" Value="Gray"/>
-                    </Trigger>
-                </DataTemplate.Triggers>
-            </DataTemplate>
-            <DataTemplate DataType="{x:Type sfcmodel:SFCToolBoxData}">
-                <Grid Width="{Binding Width}" Height="{Binding Height}" ToolTip="{Binding Kind,Converter={StaticResource EnumDescriptionConverter}}">
-                    <Rectangle Name="Border"
-                                   StrokeThickness="1"
-                                   StrokeDashArray="2"
-                                   Fill="Transparent"
-                                   SnapsToDevicePixels="true"/>
-                    <Grid IsHitTestVisible="False">
-                        <ContentControl Style="{StaticResource CustomSFCNodeStyle}" Margin="2" />
-                    </Grid>
-                </Grid>
-                <DataTemplate.Triggers>
-                    <Trigger Property="IsMouseOver" Value="true">
-                        <Setter TargetName="Border" Property="Stroke" Value="Gray"/>
-                    </Trigger>
-                </DataTemplate.Triggers>
-            </DataTemplate>
-            <DataTemplate DataType="{x:Type dd:ToolBoxCategory}">
-                <Grid Visibility="{Binding IsChecked,Converter={StaticResource boolToVisibilityConverter}}">
-                    <Expander Header="{Binding Header}" 
-                                                  IsExpanded="{Binding IsExpanded}" 
-                                                  BorderThickness="0" 
-                                                  Background="Transparent" 
-                                                  Foreground="{DynamicResource Fluent.Ribbon.Brushes.LabelTextBrush}" 
-                                                  Style="{StaticResource AIStudio.DiagramApp.Styles.Expander}">
-                        <ItemsControl  ItemsSource="{Binding ToolBoxItems}">
-                            <ItemsControl.Template>
-                                <ControlTemplate TargetType="{x:Type ItemsControl}">
-                                    <Border BorderThickness="{TemplateBinding Border.BorderThickness}"
-                                                    Padding="{TemplateBinding Control.Padding}"
-                                                    BorderBrush="{TemplateBinding Border.BorderBrush}"
-                                                    Background="{TemplateBinding Panel.Background}"
-                                                    SnapsToDevicePixels="True">
-                                        <ScrollViewer VerticalScrollBarVisibility="Auto">
-                                            <ItemsPresenter SnapsToDevicePixels="{TemplateBinding UIElement.SnapsToDevicePixels}" />
-                                        </ScrollViewer>
+                        </Grid>
+                        <DataTemplate.Triggers>
+                            <Trigger Property="IsMouseOver" Value="true">
+                                <Setter TargetName="Border" Property="Stroke" Value="Gray"/>
+                            </Trigger>
+                        </DataTemplate.Triggers>
+                    </DataTemplate>
+                    <DataTemplate DataType="{x:Type flowchartmodel:FlowchartToolBoxData}">
+                        <Grid Width="{Binding Width}" Height="{Binding Height}" ToolTip="{Binding Description}">
+                            <Rectangle Name="Border"
+                            StrokeThickness="1"
+                            StrokeDashArray="2"
+                            Fill="Transparent"
+                            SnapsToDevicePixels="true"/>
+                            <Grid IsHitTestVisible="False">
+                                <ContentControl Style="{StaticResource CustomFlowNodeStyle}" Margin="2"/>
+                                <TextBlock Text="{Binding Text}" Margin="5" TextWrapping="WrapWithOverflow" FontSize="9" Foreground="{Binding ColorViewModel.LineColor,Converter={StaticResource ColorBrushConverter}}" HorizontalAlignment="Center" VerticalAlignment="Center"/>
+                            </Grid>
+                        </Grid>
+                        <DataTemplate.Triggers>
+                            <Trigger Property="IsMouseOver" Value="true">
+                                <Setter TargetName="Border" Property="Stroke" Value="Gray"/>
+                            </Trigger>
+                        </DataTemplate.Triggers>
+                    </DataTemplate>
+                    <DataTemplate DataType="{x:Type sfcmodel:SFCToolBoxData}">
+                        <Grid Width="{Binding Width}" Height="{Binding Height}" ToolTip="{Binding Kind,Converter={StaticResource EnumDescriptionConverter}}">
+                            <Rectangle Name="Border"
+                            StrokeThickness="1"
+                            StrokeDashArray="2"
+                            Fill="Transparent"
+                            SnapsToDevicePixels="true"/>
+                            <Grid IsHitTestVisible="False">
+                                <ContentControl Style="{StaticResource CustomSFCNodeStyle}" Margin="2" />
+                            </Grid>
+                        </Grid>
+                        <DataTemplate.Triggers>
+                            <Trigger Property="IsMouseOver" Value="true">
+                                <Setter TargetName="Border" Property="Stroke" Value="Gray"/>
+                            </Trigger>
+                        </DataTemplate.Triggers>
+                    </DataTemplate>
+                    <DataTemplate DataType="{x:Type dd:ToolBoxCategory}">
+                        <Grid Visibility="{Binding IsChecked,Converter={StaticResource boolToVisibilityConverter}}">
+                            <Expander Header="{Binding Header}" 
+                                           IsExpanded="{Binding IsExpanded}" 
+                                           BorderThickness="0" 
+                                           Background="Transparent" 
+                                           Foreground="{DynamicResource Fluent.Ribbon.Brushes.LabelTextBrush}" 
+                                           Style="{StaticResource AIStudio.DiagramApp.Styles.Expander}">
+                                <ItemsControl  ItemsSource="{Binding ToolBoxItems}">
+                                    <ItemsControl.Template>
+                                        <ControlTemplate TargetType="{x:Type ItemsControl}">
+                                            <Border BorderThickness="{TemplateBinding Border.BorderThickness}"
+                                             Padding="{TemplateBinding Control.Padding}"
+                                             BorderBrush="{TemplateBinding Border.BorderBrush}"
+                                             Background="{TemplateBinding Panel.Background}"
+                                             SnapsToDevicePixels="True">
+                                                <ScrollViewer VerticalScrollBarVisibility="Auto">
+                                                    <ItemsPresenter SnapsToDevicePixels="{TemplateBinding UIElement.SnapsToDevicePixels}" />
+                                                </ScrollViewer>
+                                            </Border>
+                                        </ControlTemplate>
+                                    </ItemsControl.Template>
+                                    <ItemsControl.ItemsPanel>
+                                        <ItemsPanelTemplate>
+                                            <WrapPanel Width="{Binding RelativeSource={RelativeSource Mode=FindAncestor,AncestorType={x:Type ItemsControl}}, Path=ActualWidth}"/>
+                                        </ItemsPanelTemplate>
+                                    </ItemsControl.ItemsPanel>
+                                    <ItemsControl.ItemContainerStyle>
+                                        <Style TargetType="{x:Type ContentPresenter}">
+                                            <Setter Property="Control.Padding"
+                             Value="10" />
+                                            <Setter Property="ContentControl.HorizontalContentAlignment"
+                             Value="Stretch" />
+                                            <Setter Property="ContentControl.VerticalContentAlignment"
+                             Value="Stretch" />
+                                            <Setter Property="ToolTip"
+                             Value="{Binding ToolTip}" />
+                                            <Setter Property="dd:DragAndDropProps.EnabledForDrag"
+                             Value="True" />
+                                        </Style>
+                                    </ItemsControl.ItemContainerStyle>
+                                </ItemsControl>
+                            </Expander>
+                            <Button Margin="5" ToolTip="移除" Command="{Binding DataContext.ToolBoxViewModel.DeleteCommand, RelativeSource={RelativeSource Mode=FindAncestor,AncestorType={x:Type UserControl}}}" CommandParameter="{Binding .}" Width="16" Height="16" HorizontalAlignment="Right" VerticalAlignment="Top" Foreground="{DynamicResource BlackBrush}" Background="{DynamicResource WhiteBrush}" BorderBrush="Transparent">
+                                <Path Stretch="Fill" Margin="2" Fill="Red" Data="M0.7,0 L5,4.3 L9.3,0 L10,0.7 L5.7,5 L10,9.3 L9.3,10 L5,5.7 L0.7,10 L0,9.3 L4.3,5 L0,0.7 z" ></Path>
+                            </Button>
+                        </Grid>
+                    </DataTemplate>
+
+                    <DataTemplate DataType="{x:Type viewmodels:MineToolBoxCategory}">
+                        <Grid Visibility="{Binding IsChecked,Converter={StaticResource boolToVisibilityConverter}}">
+                            <Expander Header="{Binding Header}" 
+                                           IsExpanded="{Binding IsExpanded}" 
+                                           BorderThickness="0" 
+                                           Background="Transparent" 
+                                           Foreground="{DynamicResource Fluent.Ribbon.Brushes.LabelTextBrush}" 
+                                           Style="{StaticResource AIStudio.DiagramApp.Styles.Expander}">
+                                <Grid>
+                                    <Border BorderThickness="1" CornerRadius="5" Margin="5" Padding="10" Visibility="{Binding ToolBoxItems.Count, Converter={StaticResource IntVisibilityConverter}, ConverterParameter='0'}">
+                                        <Border.BorderBrush>
+                                            <LinearGradientBrush SpreadMethod="Repeat" StartPoint="0,5" EndPoint="5,0" MappingMode="Absolute">
+                                                <LinearGradientBrush.GradientStops>
+                                                    <GradientStop Color="{DynamicResource Fluent.Ribbon.Colors.AccentBaseColor}" Offset="0"/>
+                                                    <GradientStop Color="{DynamicResource Fluent.Ribbon.Colors.AccentBaseColor}" Offset="0.2"/>
+                                                    <GradientStop Color="Transparent" Offset="0.4"/>
+                                                    <GradientStop Color="Transparent" Offset="0.6"/>
+                                                    <GradientStop Color="{DynamicResource Fluent.Ribbon.Colors.AccentBaseColor}" Offset="0.8"/>
+                                                    <GradientStop Color="{DynamicResource Fluent.Ribbon.Colors.AccentBaseColor}" Offset="1"/>
+                                                </LinearGradientBrush.GradientStops>
+                                            </LinearGradientBrush>
+                                        </Border.BorderBrush>
+
+                                        <TextBlock Text="添加形状到我的符号" HorizontalAlignment="Center" Foreground="{DynamicResource GrayBrush2}"/>
                                     </Border>
-                                </ControlTemplate>
-                            </ItemsControl.Template>
-                            <ItemsControl.ItemsPanel>
-                                <ItemsPanelTemplate>
-                                    <WrapPanel Width="{Binding RelativeSource={RelativeSource Mode=FindAncestor,AncestorType={x:Type ItemsControl}}, Path=ActualWidth}"/>
-                                </ItemsPanelTemplate>
-                            </ItemsControl.ItemsPanel>
-                            <ItemsControl.ItemContainerStyle>
-                                <Style TargetType="{x:Type ContentPresenter}">
-                                    <Setter Property="Control.Padding"
-                                    Value="10" />
-                                    <Setter Property="ContentControl.HorizontalContentAlignment"
-                                    Value="Stretch" />
-                                    <Setter Property="ContentControl.VerticalContentAlignment"
-                                    Value="Stretch" />
-                                    <Setter Property="ToolTip"
-                                    Value="{Binding ToolTip}" />
-                                    <Setter Property="dd:DragAndDropProps.EnabledForDrag"
-                                    Value="True" />
-                                </Style>
-                            </ItemsControl.ItemContainerStyle>
-                        </ItemsControl>
-                    </Expander>
-                    <Button Margin="5" ToolTip="移除" Command="{Binding DataContext.ToolBoxViewModel.DeleteCommand, RelativeSource={RelativeSource Mode=FindAncestor,AncestorType={x:Type UserControl}}}" CommandParameter="{Binding .}" Width="16" Height="16" HorizontalAlignment="Right" VerticalAlignment="Top" Foreground="{DynamicResource BlackBrush}" Background="{DynamicResource WhiteBrush}" BorderBrush="Transparent">
-                        <Path Stretch="Fill" Margin="2" Fill="Red" Data="M0.7,0 L5,4.3 L9.3,0 L10,0.7 L5.7,5 L10,9.3 L9.3,10 L5,5.7 L0.7,10 L0,9.3 L4.3,5 L0,0.7 z" ></Path>
-                    </Button>
-                </Grid>
-            </DataTemplate>
-
-            <DataTemplate DataType="{x:Type viewmodels:MineToolBoxCategory}">
-                <Grid Visibility="{Binding IsChecked,Converter={StaticResource boolToVisibilityConverter}}">
-                    <Expander Header="{Binding Header}" 
-                                                  IsExpanded="{Binding IsExpanded}" 
-                                                  BorderThickness="0" 
-                                                  Background="Transparent" 
-                                                  Foreground="{DynamicResource Fluent.Ribbon.Brushes.LabelTextBrush}" 
-                                                  Style="{StaticResource AIStudio.DiagramApp.Styles.Expander}">
-                        <Grid>
-                            <Border BorderThickness="1" CornerRadius="5" Margin="5" Padding="10" Visibility="{Binding ToolBoxItems.Count, Converter={StaticResource IntVisibilityConverter}, ConverterParameter='0'}">
-                                <Border.BorderBrush>
-                                    <LinearGradientBrush SpreadMethod="Repeat" StartPoint="0,5" EndPoint="5,0" MappingMode="Absolute">
-                                        <LinearGradientBrush.GradientStops>
-                                            <GradientStop Color="{DynamicResource Fluent.Ribbon.Colors.AccentBaseColor}" Offset="0"/>
-                                            <GradientStop Color="{DynamicResource Fluent.Ribbon.Colors.AccentBaseColor}" Offset="0.2"/>
-                                            <GradientStop Color="Transparent" Offset="0.4"/>
-                                            <GradientStop Color="Transparent" Offset="0.6"/>
-                                            <GradientStop Color="{DynamicResource Fluent.Ribbon.Colors.AccentBaseColor}" Offset="0.8"/>
-                                            <GradientStop Color="{DynamicResource Fluent.Ribbon.Colors.AccentBaseColor}" Offset="1"/>
-                                        </LinearGradientBrush.GradientStops>
-                                    </LinearGradientBrush>
-                                </Border.BorderBrush>
-
-                                <TextBlock Text="添加形状到我的符号" HorizontalAlignment="Center" Foreground="{DynamicResource GrayBrush2}"/>
-                            </Border>
-                            <ItemsControl  ItemsSource="{Binding ToolBoxItems}">
-                                <ItemsControl.Template>
-                                    <ControlTemplate TargetType="{x:Type ItemsControl}">
-                                        <Border BorderThickness="{TemplateBinding Border.BorderThickness}"
-                                                    Padding="{TemplateBinding Control.Padding}"
-                                                    BorderBrush="{TemplateBinding Border.BorderBrush}"
-                                                    Background="{TemplateBinding Panel.Background}"
-                                                    SnapsToDevicePixels="True">
-                                            <ScrollViewer VerticalScrollBarVisibility="Auto">
-                                                <ItemsPresenter SnapsToDevicePixels="{TemplateBinding UIElement.SnapsToDevicePixels}" />
-                                            </ScrollViewer>
-                                        </Border>
-                                    </ControlTemplate>
-                                </ItemsControl.Template>
-                                <ItemsControl.ItemsPanel>
-                                    <ItemsPanelTemplate>
-                                        <WrapPanel Width="{Binding RelativeSource={RelativeSource Mode=FindAncestor,AncestorType={x:Type ItemsControl}}, Path=ActualWidth}"/>
-                                    </ItemsPanelTemplate>
-                                </ItemsControl.ItemsPanel>
-                                <ItemsControl.ItemContainerStyle>
-                                    <Style TargetType="{x:Type ContentPresenter}">
-                                        <Setter Property="Control.Padding"
-                                    Value="10" />
-                                        <Setter Property="ContentControl.HorizontalContentAlignment"
-                                    Value="Stretch" />
-                                        <Setter Property="ContentControl.VerticalContentAlignment"
-                                    Value="Stretch" />
-                                        <Setter Property="ToolTip"
-                                    Value="{Binding ToolTip}" />
-                                        <Setter Property="dd:DragAndDropProps.EnabledForDrag"
-                                    Value="True" />
-                                    </Style>
-                                </ItemsControl.ItemContainerStyle>
-                            </ItemsControl>
+                                    <ItemsControl  ItemsSource="{Binding ToolBoxItems}">
+                                        <ItemsControl.Template>
+                                            <ControlTemplate TargetType="{x:Type ItemsControl}">
+                                                <Border BorderThickness="{TemplateBinding Border.BorderThickness}"
+                                             Padding="{TemplateBinding Control.Padding}"
+                                             BorderBrush="{TemplateBinding Border.BorderBrush}"
+                                             Background="{TemplateBinding Panel.Background}"
+                                             SnapsToDevicePixels="True">
+                                                    <ScrollViewer VerticalScrollBarVisibility="Auto">
+                                                        <ItemsPresenter SnapsToDevicePixels="{TemplateBinding UIElement.SnapsToDevicePixels}" />
+                                                    </ScrollViewer>
+                                                </Border>
+                                            </ControlTemplate>
+                                        </ItemsControl.Template>
+                                        <ItemsControl.ItemsPanel>
+                                            <ItemsPanelTemplate>
+                                                <WrapPanel Width="{Binding RelativeSource={RelativeSource Mode=FindAncestor,AncestorType={x:Type ItemsControl}}, Path=ActualWidth}"/>
+                                            </ItemsPanelTemplate>
+                                        </ItemsControl.ItemsPanel>
+                                        <ItemsControl.ItemContainerStyle>
+                                            <Style TargetType="{x:Type ContentPresenter}">
+                                                <Setter Property="Control.Padding"
+                             Value="10" />
+                                                <Setter Property="ContentControl.HorizontalContentAlignment"
+                             Value="Stretch" />
+                                                <Setter Property="ContentControl.VerticalContentAlignment"
+                             Value="Stretch" />
+                                                <Setter Property="ToolTip"
+                             Value="{Binding ToolTip}" />
+                                                <Setter Property="dd:DragAndDropProps.EnabledForDrag"
+                             Value="True" />
+                                            </Style>
+                                        </ItemsControl.ItemContainerStyle>
+                                    </ItemsControl>
+                                </Grid>
+                            </Expander>
+                            <StackPanel Orientation="Horizontal" HorizontalAlignment="Right" VerticalAlignment="Top">
+                                <Button Margin="0,5,2,5" ToolTip="导入到我的符号" Command="{Binding DataContext.ToolBoxViewModel.ImportItemCommand, RelativeSource={RelativeSource Mode=FindAncestor,AncestorType={x:Type UserControl}}}" Width="16" Height="16"  Foreground="{DynamicResource BlackBrush}" Background="{DynamicResource WhiteBrush}" BorderBrush="Transparent">
+                                    <Path Stretch="Fill" Margin="2" Fill="{DynamicResource GrayBrush2}" Data="M14,12L10,8V11H2V13H10V16M20,18V6C20,4.89 19.1,4 18,4H6A2,2 0 0,0 4,6V9H6V6H18V18H6V15H4V18A2,2 0 0,0 6,20H18A2,2 0 0,0 20,18Z" ></Path>
+                                </Button>
+                                <Button Margin="0,5,2,5" ToolTip="添加到我的符号" Command="{Binding DataContext.ToolBoxViewModel.AddCommand, RelativeSource={RelativeSource Mode=FindAncestor,AncestorType={x:Type UserControl}}}" Width="16" Height="16"  Foreground="{DynamicResource BlackBrush}" Background="{DynamicResource WhiteBrush}" BorderBrush="Transparent">
+                                    <Path Stretch="Fill" Margin="2" Fill="{DynamicResource GrayBrush2}" Data="M938.666667 426.666667h-341.333334V85.333333c0-46.933333-38.4-85.333333-85.333333-85.333333s-85.333333 38.4-85.333333 85.333333v341.333334H85.333333c-46.933333 0-85.333333 38.4-85.333333 85.333333s38.4 85.333333 85.333333 85.333333h341.333334v341.333334c0 46.933333 38.4 85.333333 85.333333 85.333333s85.333333-38.4 85.333333-85.333333v-341.333334h341.333334c46.933333 0 85.333333-38.4 85.333333-85.333333s-38.4-85.333333-85.333333-85.333333z" ></Path>
+                                </Button>
+                                <Button Margin="0,5,5,5" ToolTip="移除" Command="{Binding DataContext.ToolBoxViewModel.DeleteCommand, RelativeSource={RelativeSource Mode=FindAncestor,AncestorType={x:Type UserControl}}}" CommandParameter="{Binding .}" Width="16" Height="16"  Foreground="{DynamicResource BlackBrush}" Background="{DynamicResource WhiteBrush}" BorderBrush="Transparent">
+                                    <Path Stretch="Fill" Margin="2" Fill="Red" Data="M0.7,0 L5,4.3 L9.3,0 L10,0.7 L5.7,5 L10,9.3 L9.3,10 L5,5.7 L0.7,10 L0,9.3 L4.3,5 L0,0.7 z" ></Path>
+                                </Button>
+                            </StackPanel>
                         </Grid>
-                    </Expander>
-                    <StackPanel Orientation="Horizontal" HorizontalAlignment="Right" VerticalAlignment="Top">
-                        <Button Margin="0,5,2,5" ToolTip="导入到我的符号" Command="{Binding DataContext.ToolBoxViewModel.ImportItemCommand, RelativeSource={RelativeSource Mode=FindAncestor,AncestorType={x:Type UserControl}}}" Width="16" Height="16"  Foreground="{DynamicResource BlackBrush}" Background="{DynamicResource WhiteBrush}" BorderBrush="Transparent">
-                            <Path Stretch="Fill" Margin="2" Fill="{DynamicResource GrayBrush2}" Data="M14,12L10,8V11H2V13H10V16M20,18V6C20,4.89 19.1,4 18,4H6A2,2 0 0,0 4,6V9H6V6H18V18H6V15H4V18A2,2 0 0,0 6,20H18A2,2 0 0,0 20,18Z" ></Path>
-                        </Button>
-                        <Button Margin="0,5,2,5" ToolTip="添加到我的符号" Command="{Binding DataContext.ToolBoxViewModel.AddCommand, RelativeSource={RelativeSource Mode=FindAncestor,AncestorType={x:Type UserControl}}}" Width="16" Height="16"  Foreground="{DynamicResource BlackBrush}" Background="{DynamicResource WhiteBrush}" BorderBrush="Transparent">
-                            <Path Stretch="Fill" Margin="2" Fill="{DynamicResource GrayBrush2}" Data="M938.666667 426.666667h-341.333334V85.333333c0-46.933333-38.4-85.333333-85.333333-85.333333s-85.333333 38.4-85.333333 85.333333v341.333334H85.333333c-46.933333 0-85.333333 38.4-85.333333 85.333333s38.4 85.333333 85.333333 85.333333h341.333334v341.333334c0 46.933333 38.4 85.333333 85.333333 85.333333s85.333333-38.4 85.333333-85.333333v-341.333334h341.333334c46.933333 0 85.333333-38.4 85.333333-85.333333s-38.4-85.333333-85.333333-85.333333z" ></Path>
-                        </Button>
-                        <Button Margin="0,5,5,5" ToolTip="移除" Command="{Binding DataContext.ToolBoxViewModel.DeleteCommand, RelativeSource={RelativeSource Mode=FindAncestor,AncestorType={x:Type UserControl}}}" CommandParameter="{Binding .}" Width="16" Height="16"  Foreground="{DynamicResource BlackBrush}" Background="{DynamicResource WhiteBrush}" BorderBrush="Transparent">
-                            <Path Stretch="Fill" Margin="2" Fill="Red" Data="M0.7,0 L5,4.3 L9.3,0 L10,0.7 L5.7,5 L10,9.3 L9.3,10 L5,5.7 L0.7,10 L0,9.3 L4.3,5 L0,0.7 z" ></Path>
-                        </Button>
-                    </StackPanel>
-                </Grid>
-            </DataTemplate>
+                    </DataTemplate>
 
+                </ResourceDictionary>
+            </ResourceDictionary.MergedDictionaries>
         </ResourceDictionary>
+       
     </UserControl.Resources>
     <Grid>
         <Expander x:Name="expanderLeft" ExpandDirection="Left" IsExpanded="{Binding IsExpanded, RelativeSource={RelativeSource AncestorType=views:ToolBoxControl}}" Style="{StaticResource AIStudio.DiagramApp.Styles.Expander.AutoHide}" Margin="0,0,1,0">
diff --git a/AIStudio.Wpf.DiagramDesigner/ViewModels/BaseViewModel/SelectableViewModelBase.cs b/AIStudio.Wpf.DiagramDesigner/ViewModels/BaseViewModel/SelectableViewModelBase.cs
index b4c30b3..a958564 100644
--- a/AIStudio.Wpf.DiagramDesigner/ViewModels/BaseViewModel/SelectableViewModelBase.cs
+++ b/AIStudio.Wpf.DiagramDesigner/ViewModels/BaseViewModel/SelectableViewModelBase.cs
@@ -345,6 +345,14 @@ namespace AIStudio.Wpf.DiagramDesigner
             }
         }
 
+        public bool IsConnection
+        {
+            get
+            {
+                return this is ConnectionViewModel;
+            }
+        }
+
         private IColorViewModel _colorViewModel;
         public IColorViewModel ColorViewModel
         {