wpf
Hide or remove a part of a border in WPF
I'm wondering how to remove a little part of a border inside a popup. I marked the part I want to remove with a red arrow in the picture. Thanks for your help.
Here is the Xaml code
<ControlTemplate x:Key="{ComponentResourceKey ResourceId=TopLevelHeaderTemplateKey, TypeInTargetAssembly={x:Type MenuItem}}" TargetType="{x:Type MenuItem}">
<Grid SnapsToDevicePixels="true">
<Rectangle x:Name="OuterBorder"/>
<Rectangle x:Name="Bg" Fill="{TemplateBinding Background}" Stroke="{TemplateBinding BorderBrush}"/>
<Rectangle x:Name="InnerBorder"/>
<DockPanel>
<ContentPresenter x:Name="Icon" ContentSource="Icon" Margin="4,0,6,0" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" VerticalAlignment="Center"/>
<Path x:Name="GlyphPanel" Data="{StaticResource Checkmark}" Fill="{TemplateBinding Foreground}" FlowDirection="LeftToRight" Margin="7,0,0,0" Visibility="Collapsed" VerticalAlignment="Center"/>
<ContentPresenter ContentSource="Header" Margin="{TemplateBinding Padding}" RecognizesAccessKey="True" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/>
</DockPanel>
<Popup x:Name="PART_Popup" AllowsTransparency="true" Focusable="false" HorizontalOffset="0" IsOpen="{Binding IsSubmenuOpen, RelativeSource={RelativeSource TemplatedParent}}" PopupAnimation="{DynamicResource {x:Static SystemParameters.MenuPopupAnimationKey}}" Placement="Bottom" VerticalOffset="-1">
<Themes:SystemDropShadowChrome x:Name="Shdw" Color="Transparent">
<Border x:Name="SubMenuBorder" BorderBrush="{StaticResource ResourceKey=MenuBorderColorBrush}" BorderThickness="1" Background="{StaticResource MenuOpenBackgroundColorBrush}">
<ScrollViewer x:Name="SubMenuScrollViewer" Margin="1,0" Style="{DynamicResource {ComponentResourceKey ResourceId=MenuScrollViewer, TypeInTargetAssembly={x:Type FrameworkElement}}}">
<Grid RenderOptions.ClearTypeHint="Enabled">
<Canvas HorizontalAlignment="Left" Height="0" VerticalAlignment="Top" Width="0">
<Rectangle x:Name="OpaqueRect" Fill="{StaticResource ResourceKey=MenuOpenBackgroundColorBrush}" Height="{Binding ActualHeight, ElementName=SubMenuBorder}" Width="{Binding ActualWidth, ElementName=SubMenuBorder}"/>
</Canvas>
<ItemsPresenter x:Name="ItemsPresenter" KeyboardNavigation.DirectionalNavigation="Cycle" Grid.IsSharedSizeScope="true" Margin="2" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" KeyboardNavigation.TabNavigation="Cycle"/>
</Grid>
</ScrollViewer>
</Border>
</Themes:SystemDropShadowChrome>
</Popup>
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="IsSuspendingPopupAnimation" Value="true">
<Setter Property="PopupAnimation" TargetName="PART_Popup" Value="None"/>
</Trigger>
<Trigger Property="Icon" Value="{x:Null}">
<Setter Property="Visibility" TargetName="Icon" Value="Collapsed"/>
</Trigger>
<Trigger Property="IsChecked" Value="true">
<Setter Property="Visibility" TargetName="GlyphPanel" Value="Visible"/>
<Setter Property="Visibility" TargetName="Icon" Value="Collapsed"/>
</Trigger>
<Trigger Property="HasDropShadow" SourceName="PART_Popup" Value="true">
<Setter Property="Margin" TargetName="Shdw" Value="0,0,5,5"/>
<Setter Property="Color" TargetName="Shdw" Value="#71000000"/>
</Trigger>
<Trigger Property="IsHighlighted" Value="true">
<Setter Property="Fill" TargetName="Bg" Value="{StaticResource MenuMouseOverColorBrush}"/>
<Setter Property="Stroke" TargetName="OuterBorder" Value="{StaticResource MenuMouseOverColorBrush}"/>
<Setter Property="Stroke" TargetName="InnerBorder" Value="{StaticResource MenuMouseOverColorBrush}"/>
</Trigger>
<Trigger Property="IsKeyboardFocused" Value="true">
<Setter Property="Stroke" TargetName="Bg" Value="{StaticResource MenuMouseOverColorBrush}"/>
<Setter Property="Fill" TargetName="Bg" Value="{StaticResource MenuMouseOverColorBrush}"/>
<Setter Property="Stroke" TargetName="InnerBorder" Value="{StaticResource MenuMouseOverColorBrush}"/>
</Trigger>
<Trigger Property="IsSubmenuOpen" Value="true">
<Setter Property="Stroke" TargetName="Bg" Value="{StaticResource MenuBorderColorBrush}"/>
<Setter Property="Fill" TargetName="Bg" Value="{StaticResource MenuOpenBackgroundColorBrush}"/>
<Setter Property="Stroke" TargetName="InnerBorder" Value="{StaticResource MenuBorderColorBrush}"/>
</Trigger>
<Trigger Property="IsEnabled" Value="false">
<Setter Property="Foreground" Value="#FF9A9A9A"/>
<Setter Property="Fill" TargetName="GlyphPanel" Value="#848589"/>
</Trigger>
<Trigger Property="ScrollViewer.CanContentScroll" SourceName="SubMenuScrollViewer" Value="false">
<Setter Property="Canvas.Top" TargetName="OpaqueRect" Value="{Binding VerticalOffset, ElementName=SubMenuScrollViewer}"/>
<Setter Property="Canvas.Left" TargetName="OpaqueRect" Value="{Binding HorizontalOffset, ElementName=SubMenuScrollViewer}"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
Solution
Solved this with an extra border above the part i wanted to hide. And under the HighLight Trigger i setted the width of my new border so it can match the headers width.
Here is the code:
<Style x:Key="MetroMenuStyle" TargetType="{x:Type Menu}">
<Style.Resources>
<Style x:Key="{x:Static MenuItem.SeparatorStyleKey}" TargetType="Separator">
<Setter Property="Height" Value="1"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="Separator">
<Border BorderBrush="{StaticResource MenuBorderColorBrush}" BorderThickness="1" Margin="25,0,0,0"/>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
<Style TargetType="{x:Type MenuItem}">
<Setter Property="Foreground" Value="{Binding Path=Foreground, RelativeSource={RelativeSource AncestorType={x:Type Menu}}}"/>
<Setter Property="Command"
Value="{Binding Command}" />
<Setter Property="IsEnabled" Value="{Binding IsEnabled}"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type MenuItem}">
<!--Border 1-->
<Border x:Name="Border"
BorderThickness="1" SnapsToDevicePixels="False">
<Grid x:Name="Grid">
<Grid.ColumnDefinitions>
<ColumnDefinition x:Name="Col0" MinWidth="17" Width="Auto"
SharedSizeGroup="MenuItemIconColumnGroup"/>
<ColumnDefinition Width="Auto" SharedSizeGroup="MenuTextColumnGroup"/>
<ColumnDefinition Width="Auto" SharedSizeGroup="MenuItemIGTColumnGroup"/>
<ColumnDefinition x:Name="Col3" Width="14"/>
</Grid.ColumnDefinitions>
<ContentPresenter Grid.Column="0" x:Name="Icon" VerticalAlignment="Center"
ContentSource="Icon"/>
<ContentPresenter Grid.Column="1" Margin="{TemplateBinding Padding}"
x:Name="HeaderHost" RecognizesAccessKey="True"
ContentSource="Header" VerticalAlignment="Center"/>
<ContentPresenter Grid.Column="2" Margin="8,1,8,1" x:Name="IGTHost"
ContentSource="InputGestureText" VerticalAlignment="Center"/>
<Grid Grid.Column="3" Margin="4,0,6,0" x:Name="ArrowPanel" VerticalAlignment="Center">
<Path x:Name="ArrowPanelPath" HorizontalAlignment="Right" VerticalAlignment="Center"
Fill="{TemplateBinding Foreground}" Data="M0,0 L0,8 L4,4 z"/>
</Grid>
<Popup IsOpen="{Binding Path=IsSubmenuOpen, RelativeSource={RelativeSource TemplatedParent}}"
Placement="Right" HorizontalOffset="-1" x:Name="SubMenuPopup" Focusable="false"
PopupAnimation="{DynamicResource {x:Static SystemParameters.MenuPopupAnimationKey}}"
AllowsTransparency="True">
<Grid Margin="0,0,5,5">
<!--Border 2-->
<Border x:Name="SubMenuBorder"
BorderBrush="{StaticResource MenuBorderColorBrush}"
BorderThickness="1" Background="{StaticResource MenuOpenBackgroundColorBrush}"
SnapsToDevicePixels="True">
<Grid x:Name="SubMenu" Grid.IsSharedSizeScope="True" Margin="2">
<StackPanel IsItemsHost="True"
KeyboardNavigation.DirectionalNavigation="Cycle"/>
</Grid>
<Border.Effect>
<DropShadowEffect ShadowDepth="2" Color="Black"/>
</Border.Effect>
</Border>
<!--Border 3-->
<Border Margin="1,0,0,0" x:Name="TransitionBorder" Width="0" Height="2"
VerticalAlignment="Top" HorizontalAlignment="Left"
Background="{StaticResource MenuOpenBackgroundColorBrush}" SnapsToDevicePixels="False"
BorderThickness="1" BorderBrush="{StaticResource MenuOpenBackgroundColorBrush}"/>
</Grid>
</Popup>
</Grid>
</Border>
<ControlTemplate.Triggers>
<Trigger Property="Role" Value="TopLevelHeader">
<Setter Property="Padding" Value="6,0,6,2"/>
<Setter TargetName="SubMenuPopup" Property="Placement" Value="Bottom"/>
<Setter TargetName="Col0" Property="MinWidth" Value="0"/>
<Setter TargetName="Col3" Property="Width" Value="Auto"/>
<Setter TargetName="Icon" Property="Visibility" Value="Collapsed"/>
<Setter TargetName="IGTHost" Property="Visibility" Value="Collapsed" />
<Setter TargetName="ArrowPanel" Property="Visibility" Value="Collapsed"/>
<Setter TargetName="SubMenuBorder" Property="BorderThickness" Value="1,1,1,1"/>
<Setter TargetName="SubMenu" Property="Margin" Value="2,3,2,2"/>
<Setter TargetName="TransitionBorder" Property="Width" Value="{Binding ActualWidth, ElementName=Grid}"/>
</Trigger>
<Trigger Property="Role" Value="TopLevelItem">
<Setter Property="Padding" Value="6,0,6,2"/>
<Setter TargetName="Col0" Property="MinWidth" Value="0"/>
<Setter TargetName="Col3" Property="Width" Value="Auto"/>
<Setter TargetName="Icon" Property="Visibility" Value="Collapsed"/>
<Setter TargetName="IGTHost" Property="Visibility" Value="Collapsed"/>
<Setter TargetName="ArrowPanel" Property="Visibility" Value="Collapsed"/>
</Trigger>
<Trigger Property="Role" Value="SubmenuHeader">
<Setter Property="DockPanel.Dock" Value="Top"/>
<Setter Property="Padding" Value="10,3,0,3"/>
<Setter TargetName="Border" Property="MinHeight" Value="22"/>
<Setter TargetName="Border" Property="Background" Value="{StaticResource MenuOpenBackgroundColorBrush}"/>
</Trigger>
<Trigger Property="Role" Value="SubmenuItem">
<Setter Property="DockPanel.Dock" Value="Top"/>
<Setter Property="Padding" Value="10,3,0,3"/>
<Setter TargetName="Border" Property="MinHeight" Value="22"/>
<Setter TargetName="ArrowPanel" Property="Visibility" Value="Collapsed"/>
<Setter TargetName="Border" Property="Background" Value="{StaticResource MenuOpenBackgroundColorBrush}"/>
</Trigger>
<MultiTrigger>
<MultiTrigger.Conditions>
<Condition Property="IsHighlighted" Value="true"/>
<Condition Property="Role" Value="TopLevelHeader"/>
</MultiTrigger.Conditions>
<Setter TargetName="Border" Property="Background" Value="{StaticResource MenuMouseOverColorBrush}"/>
</MultiTrigger>
<MultiTrigger>
<MultiTrigger.Conditions>
<Condition Property="IsHighlighted" Value="true"/>
<Condition Property="Role" Value="TopLevelItem"/>
</MultiTrigger.Conditions>
<Setter TargetName="Border" Property="Background" Value="Green"/>
</MultiTrigger>
<MultiTrigger>
<MultiTrigger.Conditions>
<Condition Property="IsHighlighted" Value="true"/>
<Condition Property="Role" Value="SubmenuHeader"/>
</MultiTrigger.Conditions>
<Setter TargetName="Border" Property="Background" Value="{StaticResource MenuMouseOverColorBrush}"/>
</MultiTrigger>
<MultiTrigger>
<MultiTrigger.Conditions>
<Condition Property="IsHighlighted" Value="true"/>
<Condition Property="Role" Value="SubmenuItem"/>
</MultiTrigger.Conditions>
<Setter TargetName="Border" Property="Background" Value="{StaticResource MenuMouseOverColorBrush}"/>
</MultiTrigger>
<MultiTrigger>
<MultiTrigger.Conditions>
<Condition Property="IsSubmenuOpen" Value="true"/>
<Condition Property="Role" Value="TopLevelHeader"/>
</MultiTrigger.Conditions>
<Setter TargetName="Border" Property="Background" Value="{StaticResource MenuOpenBackgroundColorBrush}"/>
<Setter TargetName="Border" Property="BorderBrush" Value="{StaticResource MenuBorderColorBrush}"/>
<Setter TargetName="Border" Property="BorderThickness" Value="1,1,1,0"/>
</MultiTrigger>
<Trigger Property="IsSubmenuOpen" Value="true">
<Setter TargetName="ArrowPanelPath" Property="Fill" Value="Black"/>
</Trigger>
<Trigger Property="IsSuspendingPopupAnimation" Value="true">
<Setter TargetName="SubMenuPopup" Property="PopupAnimation" Value="None"/>
</Trigger>
<Trigger Property="Icon" Value="{x:Null}">
<Setter TargetName="Icon" Property="Visibility" Value="Collapsed"/>
</Trigger>
<Trigger Property="IsEnabled" Value="False">
<Setter Property="Foreground" Value="Red"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</Style.Resources>
<Setter Property="Background" Value="{StaticResource WindowBackgroundColorBrush}"/>
</Style>
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