A cross-platform UI framework for .NET
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<Styles xmlns="https://github.com/avaloniaui">
<Style Selector="ComboBox">
<Setter Property="BorderBrush" Value="{DynamicResource ThemeBorderMidBrush}"/>
<Setter Property="BorderThickness" Value="{DynamicResource ThemeBorderThickness}"/>
<Setter Property="Padding" Value="4"/>
<Setter Property="Template">
<ControlTemplate>
<Border Name="border"
Background="{TemplateBinding Background}"
BorderBrush="{TemplateBinding BorderBrush}"
BorderThickness="{TemplateBinding BorderThickness}">
<Grid ColumnDefinitions="*,Auto">
<ContentControl Content="{TemplateBinding SelectionBoxItem}"
ContentTemplate="{TemplateBinding ItemTemplate}"
Margin="{TemplateBinding Padding}"
HorizontalAlignment="Left"
VerticalAlignment="Center"/>
<ToggleButton Name="toggle"
BorderThickness="0"
Background="Transparent"
ClickMode="Press"
Focusable="False"
IsChecked="{TemplateBinding IsDropDownOpen, Mode=TwoWay}"
Grid.Column="1">
<Path Fill="{DynamicResource ThemeForegroundBrush}"
Width="8"
Height="4"
Stretch="Uniform"
HorizontalAlignment="Center"
VerticalAlignment="Center"
Data="F1 M 301.14,-189.041L 311.57,-189.041L 306.355,-182.942L 301.14,-189.041 Z"/>
</ToggleButton>
<Popup Name="PART_Popup"
IsOpen="{TemplateBinding IsDropDownOpen, Mode=TwoWay}"
MinWidth="{Binding Bounds.Width, RelativeSource={RelativeSource TemplatedParent}}"
MaxHeight="{TemplateBinding MaxDropDownHeight}"
PlacementTarget="{TemplateBinding}"
ObeyScreenEdges="True"
StaysOpen="False">
<Border BorderBrush="{DynamicResource ThemeBorderMidBrush}"
BorderThickness="1">
<AdornerDecorator Margin="-1 -1 0 0">
<ScrollViewer>
<ItemsPresenter Name="PART_ItemsPresenter"
Items="{TemplateBinding Items}"
ItemsPanel="{TemplateBinding ItemsPanel}"
ItemTemplate="{TemplateBinding ItemTemplate}"
MemberSelector="{TemplateBinding MemberSelector}"
VirtualizationMode="{TemplateBinding VirtualizationMode}"
/>
</ScrollViewer>
</AdornerDecorator>
</Border>
</Popup>
</Grid>
</Border>
</ControlTemplate>
</Setter>
</Style>
<Style Selector="ComboBox:pointerover /template/ Border#border">
<Setter Property="BorderBrush" Value="{DynamicResource ThemeBorderHighBrush}"/>
</Style>
</Styles>