MaterialDesignTheme.DataGrid.ComboBox.xaml

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                    xmlns:converters="clr-namespace:MaterialDesignThemes.Wpf.Converters"
                    xmlns:wpf="clr-namespace:MaterialDesignThemes.Wpf">

  <Style x:Key="FocusVisual">
    <Setter Property="Control.Template">
      <Setter.Value>
        <ControlTemplate>
          <Rectangle Margin="2,2,2,2"
                     SnapsToDevicePixels="true"
                     Stroke="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}"
                     StrokeDashArray="1 2"
                     StrokeThickness="1" />
        </ControlTemplate>
      </Setter.Value>
    </Setter>
  </Style>

  <Style x:Key="MaterialDesignDataGridComboBoxItemStyle" TargetType="{x:Type ComboBoxItem}">
    <Setter Property="Background" Value="Transparent" />
    <Setter Property="BorderBrush" Value="Transparent" />
    <Setter Property="BorderThickness" Value="0" />
    <Setter Property="FocusVisualStyle" Value="{StaticResource FocusVisual}" />
    <Setter Property="HorizontalContentAlignment" Value="{Binding HorizontalContentAlignment, RelativeSource={RelativeSource AncestorType={x:Type ItemsControl}}, FallbackValue=Left}" />
    <Setter Property="Padding" Value="8" />
    <Setter Property="SnapsToDevicePixels" Value="True" />
    <Setter Property="Template">
      <Setter.Value>
        <ControlTemplate TargetType="{x:Type ComboBoxItem}">
          <Border x:Name="Bd"
                  Padding="{TemplateBinding Padding}"
                  Background="{TemplateBinding Background}"
                  BorderBrush="{TemplateBinding BorderBrush}"
                  BorderThickness="{TemplateBinding BorderThickness}"
                  SnapsToDevicePixels="true">
            <ContentPresenter HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
                              VerticalAlignment="{TemplateBinding VerticalContentAlignment}"
                              SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" />
          </Border>
          <ControlTemplate.Triggers>
            <Trigger Property="IsEnabled" Value="False">
              <Setter TargetName="Bd" Property="Opacity" Value="0.56" />
            </Trigger>
            <Trigger Property="IsSelected" Value="True">
              <Setter TargetName="Bd" Property="Background" Value="{DynamicResource MaterialDesign.Brush.DataGrid.ComboBoxSelected}" />
            </Trigger>
            <MultiTrigger>
              <MultiTrigger.Conditions>
                <Condition Property="IsSelected" Value="False" />
                <Condition Property="IsMouseOver" Value="True" />
              </MultiTrigger.Conditions>
              <Setter TargetName="Bd" Property="Background" Value="{DynamicResource MaterialDesign.Brush.DataGrid.ComboBoxHover}" />
            </MultiTrigger>
            <MultiTrigger>
              <MultiTrigger.Conditions>
                <Condition Property="IsSelected" Value="False" />
                <Condition Property="IsKeyboardFocused" Value="True" />
              </MultiTrigger.Conditions>
              <Setter TargetName="Bd" Property="Background" Value="{DynamicResource MaterialDesign.Brush.TextBox.ComboBoxHover}" />
            </MultiTrigger>
          </ControlTemplate.Triggers>
        </ControlTemplate>
      </Setter.Value>
    </Setter>
    <Setter Property="VerticalContentAlignment" Value="{Binding VerticalContentAlignment, RelativeSource={RelativeSource AncestorType={x:Type ItemsControl}}, FallbackValue=Center}" />
  </Style>

  <Style x:Key="MaterialDesignDataGridComboBoxToggleButton" TargetType="{x:Type ToggleButton}">
    <Setter Property="ClickMode" Value="Press" />
    <Setter Property="Focusable" Value="false" />
    <Setter Property="Foreground" Value="{Binding RelativeSource={RelativeSource AncestorType={x:Type FrameworkElement}}, Path=(TextElement.Foreground), FallbackValue=Black}" />
    <Setter Property="IsTabStop" Value="false" />
    <Setter Property="OverridesDefaultStyle" Value="true" />
    <Setter Property="Template">
      <Setter.Value>
        <ControlTemplate TargetType="{x:Type ToggleButton}">
          <Border x:Name="templateRoot"
                  Background="{TemplateBinding Background}"
                  BorderBrush="{TemplateBinding BorderBrush}"
                  BorderThickness="{TemplateBinding BorderThickness}"
                  SnapsToDevicePixels="true">
            <Border x:Name="splitBorder"
                    Margin="0"
                    HorizontalAlignment="Right"
                    VerticalAlignment="Center"
                    BorderBrush="Transparent"
                    BorderThickness="0"
                    SnapsToDevicePixels="true">
              <Viewbox Width="8"
                       Height="8"
                       Margin="2,2,0,0"
                       VerticalAlignment="Center">
                <Path x:Name="arrow"
                      Margin="0"
                      HorizontalAlignment="Right"
                      VerticalAlignment="Center"
                      Data="M0,0L5,5L10,0H7Z"
                      Fill="{TemplateBinding BorderBrush}"
                      SnapsToDevicePixels="True" />
              </Viewbox>
            </Border>
          </Border>
          <ControlTemplate.Triggers>
            <MultiDataTrigger>
              <MultiDataTrigger.Conditions>
                <Condition Binding="{Binding IsMouseOver, RelativeSource={RelativeSource Self}}" Value="true" />
                <Condition Binding="{Binding IsEditable, RelativeSource={RelativeSource AncestorType={x:Type ComboBox}}, FallbackValue=False}" Value="false" />
              </MultiDataTrigger.Conditions>
            </MultiDataTrigger>
            <MultiDataTrigger>
              <MultiDataTrigger.Conditions>
                <Condition Binding="{Binding IsMouseOver, RelativeSource={RelativeSource Self}}" Value="true" />
                <Condition Binding="{Binding IsEditable, RelativeSource={RelativeSource AncestorType={x:Type ComboBox}}, FallbackValue=False}" Value="true" />
              </MultiDataTrigger.Conditions>
              <Setter Property="BorderBrush" Value="{DynamicResource MaterialDesign.Brush.Primary}" />
            </MultiDataTrigger>
            <Trigger Property="IsPressed" Value="true">
              <Setter TargetName="arrow" Property="Fill" Value="{DynamicResource MaterialDesign.Brush.Primary.Dark}" />
            </Trigger>
            <Trigger Property="IsEnabled" Value="false">
              <Setter TargetName="arrow" Property="Fill" Value="{DynamicResource MaterialDesign.Brush.CheckBox.Disabled}" />
            </Trigger>
            <MultiDataTrigger>
              <MultiDataTrigger.Conditions>
                <Condition Binding="{Binding IsEnabled, RelativeSource={RelativeSource Self}}" Value="false" />
                <Condition Binding="{Binding IsEditable, RelativeSource={RelativeSource AncestorType={x:Type ComboBox}}, FallbackValue=False}" Value="false" />
              </MultiDataTrigger.Conditions>
              <Setter TargetName="templateRoot" Property="BorderBrush" Value="{DynamicResource MaterialDesign.Brush.CheckBox.Disabled}" />
            </MultiDataTrigger>
            <MultiDataTrigger>
              <MultiDataTrigger.Conditions>
                <Condition Binding="{Binding IsEnabled, RelativeSource={RelativeSource Self}}" Value="false" />
                <Condition Binding="{Binding IsEditable, RelativeSource={RelativeSource AncestorType={x:Type ComboBox}}, FallbackValue=False}" Value="true" />
              </MultiDataTrigger.Conditions>
              <Setter TargetName="splitBorder" Property="BorderBrush" Value="{DynamicResource MaterialDesign.Brush.CheckBox.Disabled}" />
              <Setter TargetName="templateRoot" Property="BorderBrush" Value="{DynamicResource MaterialDesign.Brush.CheckBox.Disabled}" />
            </MultiDataTrigger>
          </ControlTemplate.Triggers>
        </ControlTemplate>
      </Setter.Value>
    </Setter>
  </Style>

  <ControlTemplate x:Key="MaterialDesignDataGridComboBoxTemplate" TargetType="{x:Type ComboBox}">
    <Grid x:Name="templateRoot" SnapsToDevicePixels="true">
      <Grid.ColumnDefinitions>
        <ColumnDefinition Width="*" />
        <ColumnDefinition Width="0" MinWidth="{DynamicResource {x:Static SystemParameters.VerticalScrollBarWidthKey}}" />
      </Grid.ColumnDefinitions>
      <Popup x:Name="PART_Popup"
             Grid.ColumnSpan="2"
             Margin="1"
             AllowsTransparency="true"
             IsOpen="{TemplateBinding IsDropDownOpen}"
             Placement="Bottom"
             PlacementTarget="{Binding RelativeSource={RelativeSource AncestorType=DataGridCell}}"
             PopupAnimation="{DynamicResource {x:Static SystemParameters.ComboBoxPopupAnimationKey}}">
        <Grid MaxHeight="{TemplateBinding MaxDropDownHeight}" UseLayoutRounding="True">
          <AdornerDecorator CacheMode="{Binding RelativeSource={RelativeSource Self}, Path=(wpf:ShadowAssist.CacheMode)}">
            <Border x:Name="shadow"
                    Background="{DynamicResource MaterialDesign.Brush.ComboBox.DropDown.Background}"
                    BorderThickness="1"
                    CornerRadius="2"
                    Effect="{DynamicResource MaterialDesignShadowDepth2}" />
          </AdornerDecorator>
          <Border x:Name="dropDownBorder"
                  MinWidth="{Binding ActualWidth, RelativeSource={RelativeSource AncestorType=DataGridCell}}"
                  Margin="{Binding ElementName=shadow, Path=Margin, Mode=OneWay}"
                  Background="{DynamicResource MaterialDesign.Brush.ComboBox.DropDown.Background}"
                  BorderBrush="{DynamicResource MaterialDesign.Brush.DataGrid.ComboBoxHover}"
                  BorderThickness="1"
                  CornerRadius="2">
            <ScrollViewer x:Name="DropDownScrollViewer">
              <Grid x:Name="grid" RenderOptions.ClearTypeHint="Enabled">
                <Canvas x:Name="canvas"
                        Width="0"
                        Height="0"
                        HorizontalAlignment="Left"
                        VerticalAlignment="Top">
                  <Rectangle x:Name="opaqueRect"
                             Width="{Binding ActualWidth, ElementName=dropDownBorder}"
                             Height="{Binding ActualHeight, ElementName=dropDownBorder}"
                             Fill="{Binding Background, ElementName=dropDownBorder}" />
                </Canvas>
                <ItemsPresenter x:Name="ItemsPresenter"
                                KeyboardNavigation.DirectionalNavigation="Contained"
                                SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"
                                UseLayoutRounding="False" />
              </Grid>
            </ScrollViewer>
          </Border>
        </Grid>
      </Popup>
      <ToggleButton x:Name="toggleButton"
                    Grid.Column="0"
                    Grid.ColumnSpan="2"
                    Background="{TemplateBinding Background}"
                    BorderBrush="{TemplateBinding BorderBrush}"
                    BorderThickness="{TemplateBinding BorderThickness}"
                    IsChecked="{Binding IsDropDownOpen, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}"
                    Style="{StaticResource MaterialDesignDataGridComboBoxToggleButton}" />
      <wpf:SmartHint x:Name="Hint"
                     Grid.Column="0"
                     Margin="{TemplateBinding Padding}"
                     FontFamily="{TemplateBinding wpf:HintAssist.FontFamily}"
                     FontSize="{TemplateBinding FontSize}"
                     Hint="{TemplateBinding wpf:HintAssist.Hint}"
                     HintOpacity="{Binding Path=(wpf:HintAssist.HintOpacity), RelativeSource={RelativeSource TemplatedParent}}"
                     HintProxy="{Binding RelativeSource={RelativeSource TemplatedParent}, Converter={x:Static converters:HintProxyFabricConverter.Instance}}"
                     SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"
                     UseFloating="{Binding Path=(wpf:HintAssist.IsFloating), RelativeSource={RelativeSource TemplatedParent}}"
                     UseLayoutRounding="{TemplateBinding UseLayoutRounding}" />
      <ContentPresenter x:Name="contentPresenter"
                        Grid.Column="0"
                        Margin="{TemplateBinding Padding}"
                        HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
                        VerticalAlignment="{TemplateBinding VerticalContentAlignment}"
                        Content="{TemplateBinding SelectionBoxItem}"
                        ContentStringFormat="{TemplateBinding SelectionBoxItemStringFormat}"
                        ContentTemplate="{TemplateBinding SelectionBoxItemTemplate}"
                        ContentTemplateSelector="{TemplateBinding ItemTemplateSelector}"
                        IsHitTestVisible="false"
                        SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" />
    </Grid>
    <ControlTemplate.Triggers>
      <Trigger SourceName="PART_Popup" Property="HasDropShadow" Value="true">
        <Setter TargetName="PART_Popup" Property="HorizontalOffset" Value="-5" />
        <Setter TargetName="PART_Popup" Property="VerticalOffset" Value="-5" />
        <Setter TargetName="shadow" Property="Margin" Value="5,5,5,5" />
      </Trigger>
      <Trigger Property="HasItems" Value="false">
        <Setter TargetName="dropDownBorder" Property="Height" Value="95" />
      </Trigger>
      <MultiTrigger>
        <MultiTrigger.Conditions>
          <Condition Property="IsGrouping" Value="true" />
          <Condition Property="VirtualizingPanel.IsVirtualizingWhenGrouping" Value="false" />
        </MultiTrigger.Conditions>
        <Setter Property="ScrollViewer.CanContentScroll" Value="false" />
      </MultiTrigger>
      <Trigger SourceName="DropDownScrollViewer" Property="ScrollViewer.CanContentScroll" Value="false">
        <Setter TargetName="opaqueRect" Property="Canvas.Left" Value="{Binding HorizontalOffset, ElementName=DropDownScrollViewer}" />
        <Setter TargetName="opaqueRect" Property="Canvas.Top" Value="{Binding VerticalOffset, ElementName=DropDownScrollViewer}" />
      </Trigger>
    </ControlTemplate.Triggers>
  </ControlTemplate>

  <Style x:Key="MaterialDesignDataGridComboBoxEditableTextBox" TargetType="{x:Type TextBox}">
    <Setter Property="AllowDrop" Value="true" />
    <Setter Property="FocusVisualStyle" Value="{x:Null}" />
    <Setter Property="MinHeight" Value="0" />
    <Setter Property="MinWidth" Value="0" />
    <Setter Property="OverridesDefaultStyle" Value="true" />
    <Setter Property="ScrollViewer.PanningMode" Value="VerticalFirst" />
    <Setter Property="Stylus.IsFlicksEnabled" Value="False" />
    <Setter Property="Template">
      <Setter.Value>
        <ControlTemplate TargetType="{x:Type TextBox}">
          <Grid>
            <ScrollViewer x:Name="PART_ContentHost"
                          Focusable="false"
                          HorizontalScrollBarVisibility="Hidden"
                          VerticalScrollBarVisibility="Hidden" />
          </Grid>
        </ControlTemplate>
      </Setter.Value>
    </Setter>
    <Setter Property="wpf:TextFieldAssist.TextBoxViewMargin" Value="{x:Static wpf:Constants.DefaultTextBoxViewMarginEmbedded}" />
  </Style>

  <ControlTemplate x:Key="MaterialDesignDataGridComboBoxEditableTemplate" TargetType="{x:Type ComboBox}">
    <Grid x:Name="templateRoot" SnapsToDevicePixels="true">
      <Grid.ColumnDefinitions>
        <ColumnDefinition Width="*" />
        <ColumnDefinition Width="0" MinWidth="{DynamicResource {x:Static SystemParameters.VerticalScrollBarWidthKey}}" />
      </Grid.ColumnDefinitions>
      <Popup x:Name="PART_Popup"
             Grid.ColumnSpan="2"
             AllowsTransparency="true"
             IsOpen="{TemplateBinding IsDropDownOpen}"
             Placement="Bottom"
             PlacementTarget="{Binding RelativeSource={RelativeSource AncestorType=DataGridCell}}"
             PopupAnimation="{DynamicResource {x:Static SystemParameters.ComboBoxPopupAnimationKey}}">
        <Grid MaxHeight="{TemplateBinding MaxDropDownHeight}" UseLayoutRounding="True">
          <AdornerDecorator CacheMode="{Binding RelativeSource={RelativeSource Self}, Path=(wpf:ShadowAssist.CacheMode)}">
            <Border x:Name="shadow"
                    Background="{DynamicResource MaterialDesign.Brush.ComboBox.DropDown.Background}"
                    BorderThickness="1"
                    CornerRadius="2"
                    Effect="{DynamicResource MaterialDesignShadowDepth2}" />
          </AdornerDecorator>
          <Border x:Name="dropDownBorder"
                  MinWidth="{Binding ActualWidth, RelativeSource={RelativeSource AncestorType=DataGridCell}}"
                  Margin="{Binding ElementName=shadow, Path=Margin, Mode=OneWay}"
                  Background="{DynamicResource MaterialDesign.Brush.ComboBox.DropDown.Background}"
                  BorderBrush="{DynamicResource MaterialDesign.Brush.DataGrid.ComboBoxHover}"
                  BorderThickness="1"
                  CornerRadius="2">
            <ScrollViewer x:Name="DropDownScrollViewer">
              <Grid x:Name="grid" RenderOptions.ClearTypeHint="Enabled">
                <Canvas x:Name="canvas"
                        Width="0"
                        Height="0"
                        HorizontalAlignment="Left"
                        VerticalAlignment="Top">
                  <Rectangle x:Name="opaqueRect"
                             Width="{Binding ActualWidth, ElementName=dropDownBorder}"
                             Height="{Binding ActualHeight, ElementName=dropDownBorder}"
                             Fill="{Binding Background, ElementName=dropDownBorder}" />
                </Canvas>
                <ItemsPresenter x:Name="ItemsPresenter"
                                KeyboardNavigation.DirectionalNavigation="Contained"
                                SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"
                                UseLayoutRounding="False" />
              </Grid>
            </ScrollViewer>
          </Border>
        </Grid>
      </Popup>
      <ToggleButton x:Name="toggleButton"
                    Grid.Column="0"
                    Grid.ColumnSpan="2"
                    Background="{TemplateBinding Background}"
                    BorderBrush="{TemplateBinding BorderBrush}"
                    BorderThickness="{TemplateBinding BorderThickness}"
                    IsChecked="{Binding IsDropDownOpen, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}"
                    Style="{StaticResource MaterialDesignDataGridComboBoxToggleButton}" />
      <Border x:Name="border"
              Grid.Column="0"
              Margin="{TemplateBinding BorderThickness}"
              Background="Transparent">
        <Grid>
          <wpf:SmartHint x:Name="Hint"
                         Margin="{TemplateBinding Padding}"
                         FontFamily="{TemplateBinding wpf:HintAssist.FontFamily}"
                         FontSize="{TemplateBinding FontSize}"
                         Hint="{TemplateBinding wpf:HintAssist.Hint}"
                         HintOpacity="{Binding Path=(wpf:HintAssist.HintOpacity), RelativeSource={RelativeSource TemplatedParent}}"
                         HintProxy="{Binding RelativeSource={RelativeSource TemplatedParent}, Converter={x:Static converters:HintProxyFabricConverter.Instance}}"
                         SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"
                         UseFloating="{Binding Path=(wpf:HintAssist.IsFloating), RelativeSource={RelativeSource TemplatedParent}}"
                         UseLayoutRounding="{TemplateBinding UseLayoutRounding}" />
          <TextBox x:Name="PART_EditableTextBox"
                   Margin="{TemplateBinding Padding}"
                   HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}"
                   VerticalContentAlignment="{TemplateBinding VerticalContentAlignment}"
                   CaretBrush="{TemplateBinding Foreground}"
                   IsReadOnly="{Binding IsReadOnly, RelativeSource={RelativeSource TemplatedParent}}"
                   Style="{StaticResource MaterialDesignDataGridComboBoxEditableTextBox}" />
        </Grid>
      </Border>
    </Grid>
    <ControlTemplate.Triggers>
      <Trigger SourceName="PART_Popup" Property="HasDropShadow" Value="true">
        <Setter TargetName="PART_Popup" Property="HorizontalOffset" Value="-5" />
        <Setter TargetName="PART_Popup" Property="VerticalOffset" Value="-5" />
        <Setter TargetName="shadow" Property="Margin" Value="5,5,5,5" />
      </Trigger>
      <Trigger Property="IsEnabled" Value="false">
        <Setter TargetName="border" Property="Opacity" Value="0.56" />
      </Trigger>
      <Trigger Property="HasItems" Value="false">
        <Setter TargetName="dropDownBorder" Property="Height" Value="95" />
      </Trigger>
      <MultiTrigger>
        <MultiTrigger.Conditions>
          <Condition Property="IsGrouping" Value="true" />
          <Condition Property="VirtualizingPanel.IsVirtualizingWhenGrouping" Value="false" />
        </MultiTrigger.Conditions>
        <Setter Property="ScrollViewer.CanContentScroll" Value="false" />
      </MultiTrigger>
      <Trigger SourceName="DropDownScrollViewer" Property="ScrollViewer.CanContentScroll" Value="false">
        <Setter TargetName="opaqueRect" Property="Canvas.Left" Value="{Binding HorizontalOffset, ElementName=DropDownScrollViewer}" />
        <Setter TargetName="opaqueRect" Property="Canvas.Top" Value="{Binding VerticalOffset, ElementName=DropDownScrollViewer}" />
      </Trigger>
    </ControlTemplate.Triggers>
  </ControlTemplate>

  <Style x:Key="MaterialDesignDataGridComboBox" TargetType="{x:Type ComboBox}">
    <Setter Property="Background" Value="Transparent" />
    <Setter Property="BorderBrush" Value="{DynamicResource MaterialDesign.Brush.ForegroundLight}" />
    <Setter Property="BorderThickness" Value="0,0,0,0" />
    <!-- Setter Property="FocusVisualStyle" Value="{StaticResource FocusVisual}"/ -->
    <Setter Property="FocusVisualStyle" Value="{x:Null}" />
    <Setter Property="Foreground" Value="{Binding RelativeSource={RelativeSource AncestorType={x:Type FrameworkElement}}, Path=(TextElement.Foreground), FallbackValue=Black}" />
    <Setter Property="IsSynchronizedWithCurrentItem" Value="False" />
    <Setter Property="ItemContainerStyle" Value="{StaticResource MaterialDesignDataGridComboBoxItemStyle}" />
    <!-- Virtualization -->
    <Setter Property="ItemsPanel">
      <Setter.Value>
        <ItemsPanelTemplate>
          <VirtualizingStackPanel />
        </ItemsPanelTemplate>
      </Setter.Value>
    </Setter>
    <Setter Property="Padding" Value="0,0,0,0" />
    <Setter Property="ScrollViewer.CanContentScroll" Value="true" />
    <Setter Property="ScrollViewer.HorizontalScrollBarVisibility" Value="Auto" />
    <Setter Property="ScrollViewer.PanningMode" Value="Both" />
    <Setter Property="ScrollViewer.VerticalScrollBarVisibility" Value="Auto" />
    <Setter Property="Stylus.IsFlicksEnabled" Value="False" />
    <Setter Property="Template" Value="{StaticResource MaterialDesignDataGridComboBoxTemplate}" />
    <Style.Triggers>
      <Trigger Property="IsEditable" Value="true">
        <Setter Property="IsTabStop" Value="false" />
        <Setter Property="Template" Value="{StaticResource MaterialDesignDataGridComboBoxEditableTemplate}" />
      </Trigger>
    </Style.Triggers>
  </Style>
</ResourceDictionary>