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[DevExpress] Add Fluent styles for TreeDataGrid
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‎src/Devolutions.AvaloniaTheme.DevExpress/Accents/Styles.axaml‎

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<Style Selector="DataGridRow:nth-child(even)">
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<Setter Property="Background" Value="{DynamicResource DataGridRowAlternatingBackgroundBrush}" />
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</Style>
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<Style Selector=":is(TreeDataGridCell)">
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<Setter Property="Background" Value="Transparent" />
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<Setter Property="MinHeight" Value="25" />
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</Style>
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<Style Selector=":is(TreeDataGridCell):selected">
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<Setter Property="Background" Value="{DynamicResource TreeDataGridSelectedCellBackgroundBrush}" />
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</Style>
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</Styles>

‎src/Devolutions.AvaloniaTheme.DevExpress/Controls/TreeDataGrid.axaml‎

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<!-- Based on https://github.com/AvaloniaUI/Avalonia.Controls.TreeDataGrid/blob/master/src/Avalonia.Controls.TreeDataGrid/Themes/Generic.axaml
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and https://github.com/AvaloniaUI/Avalonia.Controls.TreeDataGrid/blob/master/src/Avalonia.Controls.TreeDataGrid/Themes/Fluent.axaml -->
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<ResourceDictionary xmlns="https://github.com/avaloniaui"
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xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
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xmlns:conv="using:Avalonia.Controls.Converters">
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<ResourceDictionary.ThemeDictionaries>
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<ResourceDictionary x:Key="Default">
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<SolidColorBrush x:Key="TreeDataGridGridLinesBrush" Color="{StaticResource SystemListLowColor}" />
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<SolidColorBrush x:Key="TreeDataGridHeaderBackgroundPointerOverBrush" Color="{StaticResource SystemBaseHighColor}" Opacity="0.1" />
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<SolidColorBrush x:Key="TreeDataGridHeaderBackgroundPressedBrush" Color="{StaticResource SystemBaseMediumLowColor}" />
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<SolidColorBrush x:Key="TreeDataGridHeaderBorderBrushPointerOverBrush" Color="Transparent" />
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<SolidColorBrush x:Key="TreeDataGridHeaderBorderBrushPressedBrush" Color="Transparent" />
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<SolidColorBrush x:Key="TreeDataGridHeaderForegroundPointerOverBrush" Color="{StaticResource SystemBaseHighColor}" />
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<SolidColorBrush x:Key="TreeDataGridHeaderForegroundPressedBrush" Color="{StaticResource SystemBaseHighColor}" />
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<SolidColorBrush x:Key="TreeDataGridSelectedCellBackgroundBrush" Color="{StaticResource SystemAccentColor}" Opacity="0.4" />
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</ResourceDictionary>
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<ResourceDictionary x:Key="Dark">
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<SolidColorBrush x:Key="TreeDataGridGridLinesBrush" Color="{StaticResource SystemListLowColor}" />
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<SolidColorBrush x:Key="TreeDataGridHeaderBackgroundPointerOverBrush" Color="{StaticResource SystemBaseHighColor}" Opacity="0.1" />
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<SolidColorBrush x:Key="TreeDataGridHeaderBackgroundPressedBrush" Color="{StaticResource SystemBaseMediumLowColor}" />
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<SolidColorBrush x:Key="TreeDataGridHeaderBorderBrushPointerOverBrush" Color="Transparent" />
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<SolidColorBrush x:Key="TreeDataGridHeaderBorderBrushPressedBrush" Color="Transparent" />
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<SolidColorBrush x:Key="TreeDataGridHeaderForegroundPointerOverBrush" Color="{StaticResource SystemBaseHighColor}" />
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<SolidColorBrush x:Key="TreeDataGridHeaderForegroundPressedBrush" Color="{StaticResource SystemBaseHighColor}" />
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<SolidColorBrush x:Key="TreeDataGridSelectedCellBackgroundBrush" Color="{StaticResource SystemAccentColor}" Opacity="0.4" />
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</ResourceDictionary>
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</ResourceDictionary.ThemeDictionaries>
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<StreamGeometry x:Key="TreeDataGridSortIconDescendingPath">M1875 1011l-787 787v-1798h-128v1798l-787 -787l-90 90l941 941l941 -941z</StreamGeometry>
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<StreamGeometry x:Key="TreeDataGridSortIconAscendingPath">M1965 947l-941 -941l-941 941l90 90l787 -787v1798h128v-1798l787 787z</StreamGeometry>
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<StreamGeometry x:Key="TreeDataGridItemCollapsedChevronPathData">M 1,0 10,10 l -9,10 -1,-1 L 8,10 -0,1 Z</StreamGeometry>
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<StreamGeometry x:Key="TreeDataGridItemExpandedChevronPathData">M0,1 L10,10 20,1 19,0 10,8 1,0 Z</StreamGeometry>
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<ControlTheme x:Key="{x:Type TreeDataGrid}" TargetType="TreeDataGrid">
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<Setter Property="Template">
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<ControlTemplate>
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<Border x:Name="RootBorder"
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Background="{TemplateBinding Background}"
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BorderBrush="{TemplateBinding BorderBrush}"
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BorderThickness="{TemplateBinding BorderThickness}"
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CornerRadius="{TemplateBinding CornerRadius}">
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<DockPanel>
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<ScrollViewer Name="PART_HeaderScrollViewer"
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DockPanel.Dock="Top"
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IsVisible="{TemplateBinding ShowColumnHeaders}"
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HorizontalScrollBarVisibility="Hidden"
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VerticalScrollBarVisibility="Disabled"
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BringIntoViewOnFocusChange="{TemplateBinding (ScrollViewer.BringIntoViewOnFocusChange)}">
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<Border x:Name="ColumnHeadersPresenterBorder">
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<TreeDataGridColumnHeadersPresenter Name="PART_ColumnHeadersPresenter"
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ElementFactory="{TemplateBinding ElementFactory}"
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Items="{TemplateBinding Columns}" />
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</Border>
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</ScrollViewer>
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<ScrollViewer Name="PART_ScrollViewer"
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HorizontalScrollBarVisibility="Auto"
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BringIntoViewOnFocusChange="{TemplateBinding (ScrollViewer.BringIntoViewOnFocusChange)}">
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<TreeDataGridRowsPresenter Name="PART_RowsPresenter"
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Columns="{TemplateBinding Columns}"
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ElementFactory="{TemplateBinding ElementFactory}"
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Items="{TemplateBinding Rows}" />
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</ScrollViewer>
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</DockPanel>
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</Border>
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</ControlTemplate>
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</Setter>
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<Style Selector="^/template/ Border#ColumnHeadersPresenterBorder">
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<Setter Property="BorderThickness" Value="0 0 0 1" />
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<Setter Property="BorderBrush" Value="{DynamicResource TreeDataGridGridLinesBrush}" />
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</Style>
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</ControlTheme>
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<ControlTheme x:Key="{x:Type TreeDataGridColumnHeader}" TargetType="TreeDataGridColumnHeader">
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<Setter Property="Background" Value="Transparent" />
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<Setter Property="MinHeight" Value="25" />
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<Setter Property="Padding" Value="4 2" />
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<Setter Property="VerticalContentAlignment" Value="Center" />
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<Setter Property="Template">
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<ControlTemplate>
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<Border Name="DataGridBorder"
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Background="{TemplateBinding Background}"
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BorderBrush="{TemplateBinding BorderBrush}"
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BorderThickness="{TemplateBinding BorderThickness}"
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CornerRadius="{TemplateBinding CornerRadius}">
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<DockPanel VerticalAlignment="Stretch">
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<Panel DockPanel.Dock="Right"
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TabIndex="2">
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<Rectangle Fill="{DynamicResource TreeDataGridGridLinesBrush}"
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HorizontalAlignment="Right"
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Width="1" />
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<Thumb Name="PART_Resizer"
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DockPanel.Dock="Right"
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Background="Transparent"
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Cursor="SizeWestEast"
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IsVisible="{TemplateBinding CanUserResize}"
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Width="5">
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<Thumb.Template>
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<ControlTemplate>
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<Border Background="{TemplateBinding Background}"
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VerticalAlignment="Stretch" />
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</ControlTemplate>
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</Thumb.Template>
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</Thumb>
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</Panel>
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<Path Name="SortIcon"
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DockPanel.Dock="Right"
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Fill="{TemplateBinding Foreground}"
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HorizontalAlignment="Center"
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VerticalAlignment="Center"
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Stretch="Uniform"
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Height="12"
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TabIndex="1" />
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<ContentPresenter Name="PART_ContentPresenter"
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Content="{TemplateBinding Header}"
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ContentTemplate="{TemplateBinding ContentTemplate}"
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Padding="{TemplateBinding Padding}"
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HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}"
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VerticalContentAlignment="{TemplateBinding VerticalContentAlignment}"
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TabIndex="0">
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<ContentPresenter.DataTemplates>
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<DataTemplate DataType="x:String">
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<TextBlock Text="{Binding}" TextTrimming="CharacterEllipsis" />
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</DataTemplate>
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</ContentPresenter.DataTemplates>
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</ContentPresenter>
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</DockPanel>
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</Border>
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</ControlTemplate>
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</Setter>
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<Style Selector="^:pointerover /template/ Border#DataGridBorder">
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<Setter Property="Background" Value="{DynamicResource TreeDataGridHeaderBackgroundPointerOverBrush}" />
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<Setter Property="BorderBrush" Value="{DynamicResource TreeDataGridHeaderBorderBrushPointerOverBrush}" />
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<Setter Property="TextBlock.Foreground"
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Value="{DynamicResource TreeDataGridHeaderForegroundPointerOverBrush}" />
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</Style>
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<Style Selector="^:pressed /template/ Border#DataGridBorder">
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<Setter Property="Background" Value="{DynamicResource TreeDataGridHeaderBackgroundPressedBrush}" />
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<Setter Property="BorderBrush" Value="{DynamicResource TreeDataGridHeaderBorderBrushPressedBrush}" />
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<Setter Property="TextBlock.Foreground" Value="{DynamicResource TreeDataGridHeaderForegroundPressedBrush}" />
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</Style>
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<Style Selector="^[SortDirection=Ascending] /template/ Path#SortIcon">
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<Setter Property="IsVisible" Value="True" />
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<Setter Property="Data" Value="{DynamicResource TreeDataGridSortIconAscendingPath}" />
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</Style>
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<Style Selector="^[SortDirection=Descending] /template/ Path#SortIcon">
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<Setter Property="IsVisible" Value="True" />
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<Setter Property="Data" Value="{DynamicResource TreeDataGridSortIconDescendingPath}" />
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</Style>
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</ControlTheme>
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<ControlTheme x:Key="{x:Type TreeDataGridRow}" TargetType="TreeDataGridRow">
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<Setter Property="Template">
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<ControlTemplate>
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<Border x:Name="RowBorder"
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Background="{TemplateBinding Background}"
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BorderBrush="{TemplateBinding BorderBrush}"
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BorderThickness="{TemplateBinding BorderThickness}"
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CornerRadius="{TemplateBinding CornerRadius}">
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<TreeDataGridCellsPresenter Name="PART_CellsPresenter"
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ElementFactory="{TemplateBinding ElementFactory}"
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Items="{TemplateBinding Columns}"
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Rows="{TemplateBinding Rows}" />
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</Border>
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</ControlTemplate>
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</Setter>
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<Style Selector="^:selected /template/ TreeDataGridCellsPresenter#PART_CellsPresenter">
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<Setter Property="Background" Value="{DynamicResource TreeDataGridSelectedCellBackgroundBrush}" />
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</Style>
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</ControlTheme>
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<ControlTheme x:Key="{x:Type TreeDataGridCheckBoxCell}" TargetType="TreeDataGridCheckBoxCell">
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<Setter Property="Padding" Value="4 2" />
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<Setter Property="Template">
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<ControlTemplate>
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<Border x:Name="CellBorder"
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Background="{TemplateBinding Background}"
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BorderBrush="{TemplateBinding BorderBrush}"
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BorderThickness="{TemplateBinding BorderThickness}"
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CornerRadius="{TemplateBinding CornerRadius}"
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Padding="{TemplateBinding Padding}">
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<CheckBox IsChecked="{TemplateBinding Value, Mode=TwoWay}"
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IsEnabled="{Binding !IsReadOnly, RelativeSource={RelativeSource TemplatedParent}}"
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IsThreeState="{TemplateBinding IsThreeState}" />
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</Border>
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</ControlTemplate>
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</Setter>
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</ControlTheme>
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<ControlTheme x:Key="TreeDataGridExpandCollapseChevron" TargetType="ToggleButton">
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<Setter Property="Margin" Value="0" />
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<Setter Property="Width" Value="12" />
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<Setter Property="Height" Value="12" />
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<Setter Property="Template">
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<ControlTemplate>
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<Border Background="Transparent"
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Width="{TemplateBinding Width}"
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Height="{TemplateBinding Height}"
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HorizontalAlignment="Center"
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VerticalAlignment="Center">
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<Path x:Name="ChevronPath"
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Data="{StaticResource TreeDataGridItemCollapsedChevronPathData}"
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Fill="{TemplateBinding Foreground}"
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Stretch="Uniform"
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HorizontalAlignment="Center"
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VerticalAlignment="Center" />
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</Border>
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</ControlTemplate>
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</Setter>
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<Style Selector="^:checked /template/ Path#ChevronPath">
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<Setter Property="Data" Value="{StaticResource TreeDataGridItemExpandedChevronPathData}" />
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</Style>
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</ControlTheme>
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<ControlTheme x:Key="{x:Type TreeDataGridExpanderCell}" TargetType="TreeDataGridExpanderCell">
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<Setter Property="Template">
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<ControlTemplate>
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<Border x:Name="CellBorder"
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Background="{TemplateBinding Background}"
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BorderBrush="{TemplateBinding BorderBrush}"
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BorderThickness="{TemplateBinding BorderThickness}"
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CornerRadius="{TemplateBinding CornerRadius}"
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Padding="{TemplateBinding Indent, Converter={x:Static conv:IndentConverter.Instance}}">
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<DockPanel>
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<Border DockPanel.Dock="Left"
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Margin="4 0"
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Width="12" Height="12">
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<ToggleButton Theme="{StaticResource TreeDataGridExpandCollapseChevron}"
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Focusable="False"
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IsChecked="{TemplateBinding IsExpanded, Mode=TwoWay}"
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IsVisible="{TemplateBinding ShowExpander}" />
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</Border>
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<Decorator Name="PART_Content" />
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</DockPanel>
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</Border>
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</ControlTemplate>
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</Setter>
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</ControlTheme>
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<ControlTheme x:Key="{x:Type TreeDataGridTextCell}" TargetType="TreeDataGridTextCell">
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<Setter Property="Padding" Value="4 2" />
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<Setter Property="Template">
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<ControlTemplate>
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<Border x:Name="CellBorder"
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Background="{TemplateBinding Background}"
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BorderBrush="{TemplateBinding BorderBrush}"
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BorderThickness="{TemplateBinding BorderThickness}"
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CornerRadius="{TemplateBinding CornerRadius}"
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Padding="{TemplateBinding Padding}">
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<TextBlock Text="{TemplateBinding Value}"
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TextTrimming="{TemplateBinding TextTrimming}"
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TextWrapping="{TemplateBinding TextWrapping}"
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TextAlignment="{TemplateBinding TextAlignment}"
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VerticalAlignment="Center" />
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</Border>
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</ControlTemplate>
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</Setter>
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<Style Selector="^:editing">
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<Setter Property="Padding" Value="4 2" />
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<Setter Property="Template">
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<ControlTemplate>
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<Border x:Name="CellBorder"
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Background="{TemplateBinding Background}"
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BorderBrush="{TemplateBinding BorderBrush}"
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BorderThickness="{TemplateBinding BorderThickness}"
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CornerRadius="{TemplateBinding CornerRadius}"
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Padding="{TemplateBinding Padding}">
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<TextBox Name="PART_Edit"
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Text="{TemplateBinding Value, Mode=TwoWay}" />
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</Border>
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</ControlTemplate>
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</Setter>
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</Style>
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<Style Selector="^:editing /template/ TextBox#PART_Edit">
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<Setter Property="Background" Value="Transparent" />
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<Setter Property="MinHeight" Value="25" />
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<Setter Property="Padding" Value="10,3,6,3" />
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<Setter Property="VerticalAlignment" Value="Center" />
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</Style>
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<Style Selector="^:editing /template/ TextBox#PART_Edit DataValidationErrors">
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<Setter Property="Template" Value="{DynamicResource TooltipDataValidationContentTemplate}" />
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<Setter Property="ErrorTemplate" Value="{DynamicResource TooltipDataValidationErrorTemplate}" />
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</Style>
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</ControlTheme>
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<ControlTheme x:Key="{x:Type TreeDataGridTemplateCell}" TargetType="TreeDataGridTemplateCell">
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<Setter Property="Template">
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<ControlTemplate>
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<ContentPresenter Name="PART_ContentPresenter"
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Background="{TemplateBinding Background}"
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BorderBrush="{TemplateBinding BorderBrush}"
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BorderThickness="{TemplateBinding BorderThickness}"
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ContentTemplate="{TemplateBinding ContentTemplate}"
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CornerRadius="{TemplateBinding CornerRadius}"
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Content="{TemplateBinding Content}"
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Padding="{TemplateBinding Padding}" />
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</ControlTemplate>
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</Setter>
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<Style Selector="^:editing">
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<Setter Property="Padding" Value="4 2" />
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<Setter Property="Template">
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<ControlTemplate>
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<ContentPresenter Name="PART_EditingContentPresenter"
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Background="{TemplateBinding Background}"
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BorderBrush="{TemplateBinding BorderBrush}"
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BorderThickness="{TemplateBinding BorderThickness}"
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ContentTemplate="{TemplateBinding EditingTemplate}"
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CornerRadius="{TemplateBinding CornerRadius}"
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Content="{TemplateBinding Content}"
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Padding="{TemplateBinding Padding}" />
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</ControlTemplate>
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</Setter>
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</Style>
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</ControlTheme>
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</ResourceDictionary>
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<!-- Additional styling in Accents/Styles.axaml -->

‎src/Devolutions.AvaloniaTheme.DevExpress/Controls/_index.axaml‎

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<MergeResourceInclude Source="TextBox.axaml" />
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<MergeResourceInclude Source="TreeView.axaml" />
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<MergeResourceInclude Source="TreeViewItem.axaml" />
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<MergeResourceInclude Source="TreeDataGrid.axaml" />
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<MergeResourceInclude Source="ContextMenu.axaml" />
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<MergeResourceInclude Source="Window.axaml" />
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</ResourceDictionary.MergedDictionaries>

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