Shrlalgo.RvKits/WPFluent/Controls/DropDownButton/DropDownButton.xaml

<ResourceDictionary
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:controls="clr-namespace:WPFluent.Controls"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
    <ResourceDictionary.MergedDictionaries>
        <!--<ResourceDictionary Source="/WPFluent;component/Themes/Light.xaml"/>-->
        <ResourceDictionary Source="pack://application:,,,/WPFluent;component/Controls/Button/Button.xaml" />
    </ResourceDictionary.MergedDictionaries>

    <Thickness x:Key="ButtonChevronIconMargin">8,0,0,0</Thickness>

    <Style
        BasedOn="{StaticResource DefaultUiButtonStyle}"
        TargetType="{x:Type controls:DropDownButton}"
        x:Key="DefaultUiDropDownButtonStyle">
        <Setter Property="IsDropDownOpen" Value="False" />
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type controls:DropDownButton}">
                    <Border
                        Background="{TemplateBinding Background}"
                        CornerRadius="{TemplateBinding CornerRadius}"
                        Height="{TemplateBinding Height}"
                        HorizontalAlignment="{TemplateBinding HorizontalAlignment}"
                        MinHeight="{TemplateBinding MinHeight}"
                        MinWidth="{TemplateBinding MinWidth}"
                        VerticalAlignment="{TemplateBinding VerticalAlignment}"
                        Width="{TemplateBinding Width}"
                        x:Name="ContentBorder">
                        <Border
                            BorderBrush="{TemplateBinding BorderBrush}"
                            BorderThickness="{TemplateBinding BorderThickness}"
                            CornerRadius="{TemplateBinding CornerRadius}"
                            Padding="{TemplateBinding Padding}">
                            <Grid HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}">
                                <Grid.ColumnDefinitions>
                                    <ColumnDefinition Width="Auto" />
                                    <ColumnDefinition Width="*" />
                                    <ColumnDefinition Width="Auto" />
                                </Grid.ColumnDefinitions>
                                <ContentPresenter
                                    Content="{TemplateBinding Icon}"
                                    ContentTemplate="{TemplateBinding ContentTemplate}"
                                    Focusable="False"
                                    Grid.Column="0"
                                    Margin="{StaticResource ButtonIconMargin}"
                                    TextElement.FontSize="{TemplateBinding FontSize}"
                                    TextElement.Foreground="{TemplateBinding Foreground}"
                                    VerticalAlignment="Center"
                                    x:Name="ControlIcon" />

                                <ContentPresenter
                                    Content="{TemplateBinding Content}"
                                    Grid.Column="1"
                                    TextElement.Foreground="{TemplateBinding Foreground}"
                                    VerticalAlignment="Center"
                                    x:Name="ContentPresenter" />

                                <Grid Grid.Column="2" Margin="{StaticResource ButtonChevronIconMargin}">
                                    <controls:SymbolIcon FontSize="10" Symbol="ChevronDown24" />
                                </Grid>
                            </Grid>
                        </Border>
                    </Border>
                    <ControlTemplate.Triggers>
                        <MultiTrigger>
                            <MultiTrigger.Conditions>
                                <Condition Property="IsMouseOver" Value="True" />
                                <Condition Property="IsPressed" Value="False" />
                            </MultiTrigger.Conditions>
                            <Setter Property="Background" TargetName="ContentBorder" Value="{Binding MouseOverBackground, RelativeSource={RelativeSource TemplatedParent}}" />
                            <Setter Property="BorderBrush" TargetName="ContentBorder" Value="{Binding MouseOverBorderBrush, RelativeSource={RelativeSource TemplatedParent}}" />
                        </MultiTrigger>
                        <MultiTrigger>
                            <MultiTrigger.Conditions>
                                <Condition Property="IsMouseOver" Value="True" />
                                <Condition Property="IsPressed" Value="True" />
                            </MultiTrigger.Conditions>
                            <Setter Property="Background" TargetName="ContentBorder" Value="{Binding PressedBackground, RelativeSource={RelativeSource TemplatedParent}}" />
                            <Setter Property="BorderBrush" TargetName="ContentBorder" Value="{Binding PressedBorderBrush, RelativeSource={RelativeSource TemplatedParent}}" />
                            <Setter Property="TextElement.Foreground" TargetName="ContentPresenter" Value="{Binding PressedForeground, RelativeSource={RelativeSource TemplatedParent}}" />
                            <Setter Property="TextElement.Foreground" TargetName="ControlIcon" Value="{Binding PressedForeground, RelativeSource={RelativeSource TemplatedParent}}" />
                        </MultiTrigger>
                        <Trigger Property="IsEnabled" Value="False">
                            <Setter Property="Background" TargetName="ContentBorder" Value="{DynamicResource ControlFillColorDisabledBrush}" />
                            <Setter Property="BorderBrush" TargetName="ContentBorder" Value="{DynamicResource ControlStrokeColorDefaultBrush}" />
                            <Setter Property="TextElement.Foreground" TargetName="ContentPresenter" Value="{DynamicResource TextFillColorDisabledBrush}" />
                        </Trigger>
                        <Trigger Property="Content" Value="{x:Null}">
                            <Setter Property="Margin" TargetName="ControlIcon" Value="0" />
                        </Trigger>
                        <Trigger Property="Content" Value="">
                            <Setter Property="Margin" TargetName="ControlIcon" Value="0" />
                        </Trigger>
                        <Trigger Property="Icon" Value="{x:Null}">
                            <Setter Property="Margin" TargetName="ControlIcon" Value="0" />
                            <Setter Property="Visibility" TargetName="ControlIcon" Value="Collapsed" />
                        </Trigger>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

    <Style BasedOn="{StaticResource DefaultUiDropDownButtonStyle}" TargetType="{x:Type controls:DropDownButton}" />

</ResourceDictionary>