ShrlAlgoToolkit/Melskin/Controls/TreeView.xaml

<ResourceDictionary
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:assists="clr-namespace:Melskin.Assists"
    xmlns:controls="clr-namespace:Melskin.Controls">
    <ResourceDictionary.MergedDictionaries>
        <ResourceDictionary Source="/Melskin;component/Themes/Animations.xaml" />
    </ResourceDictionary.MergedDictionaries>
    <Style x:Key="ExpandCollapseToggleButtonStyle" TargetType="{x:Type ToggleButton}">
        <Setter Property="FocusVisualStyle" Value="{DynamicResource FocusVisual}" />
        <Setter Property="Focusable" Value="False" />
        <Setter Property="OverridesDefaultStyle" Value="True" />
        <Setter Property="SnapsToDevicePixels" Value="True" />
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="ToggleButton">
                    <controls:IconElement
                        x:Name="ChevronIcon"
                        VerticalAlignment="Center"
                        FontSize="14"
                        RenderTransformOrigin="0.5,0.5"
                        Symbol="ChevronRight">
                        <controls:IconElement.RenderTransform>
                            <RotateTransform Angle="0" />
                        </controls:IconElement.RenderTransform>
                    </controls:IconElement>
                    <ControlTemplate.Triggers>
                        <Trigger Property="IsChecked" Value="True">
                            <Trigger.EnterActions>
                                <BeginStoryboard>
                                    <Storyboard>
                                        <DoubleAnimation
                                            Storyboard.TargetName="ChevronIcon"
                                            Storyboard.TargetProperty="(Grid.RenderTransform).(RotateTransform.Angle)"
                                            To="90"
                                            Duration="0:0:0.16" />
                                    </Storyboard>
                                </BeginStoryboard>
                            </Trigger.EnterActions>
                            <Trigger.ExitActions>
                                <BeginStoryboard>
                                    <Storyboard>
                                        <DoubleAnimation
                                            Storyboard.TargetName="ChevronIcon"
                                            Storyboard.TargetProperty="(Grid.RenderTransform).(RotateTransform.Angle)"
                                            To="0"
                                            Duration="0:0:0.16" />
                                    </Storyboard>
                                </BeginStoryboard>
                            </Trigger.ExitActions>
                        </Trigger>
                        <!--<Trigger Property="IsMouseOver" Value="True">
                            <Setter TargetName="ChevronIcon" Property="Foreground" Value="{DynamicResource TextSecondaryBrush}" />
                        </Trigger>-->
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

    <Style TargetType="{x:Type TreeView}">
        <Setter Property="Background" Value="{DynamicResource ControlBackgroundNormalBrush}" />
        <Setter Property="BorderBrush" Value="{DynamicResource BorderNormalBrush}" />
        <Setter Property="BorderThickness" Value="1" />
        <Setter Property="Padding" Value="4" />
        <Setter Property="Foreground" Value="{DynamicResource TextPrimaryBrush}" />
        <Setter Property="ScrollViewer.HorizontalScrollBarVisibility" Value="Auto" />
        <Setter Property="ScrollViewer.VerticalScrollBarVisibility" Value="Auto" />
        <Setter Property="ScrollViewer.PanningMode" Value="Both" />
        <Setter Property="assists:ControlAssist.CornerRadius" Value="4" />

        <Setter Property="Stylus.IsFlicksEnabled" Value="False" />
        <Setter Property="VerticalContentAlignment" Value="Center" />
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type TreeView}">
                    <Border
                        x:Name="Bd"
                        Background="{TemplateBinding Background}"
                        BorderBrush="{TemplateBinding BorderBrush}"
                        BorderThickness="{TemplateBinding BorderThickness}"
                        CornerRadius="{TemplateBinding assists:ControlAssist.CornerRadius}"
                        SnapsToDevicePixels="True">
                        <ScrollViewer
                            x:Name="treeViewScroll"
                            Padding="{TemplateBinding Padding}"
                            CanContentScroll="False"
                            Focusable="False"
                            HorizontalScrollBarVisibility="{TemplateBinding ScrollViewer.HorizontalScrollBarVisibility}"
                            SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"
                            VerticalScrollBarVisibility="{TemplateBinding ScrollViewer.VerticalScrollBarVisibility}">
                            <ItemsPresenter />
                        </ScrollViewer>
                    </Border>
                    <ControlTemplate.Triggers>
                        <Trigger Property="IsEnabled" Value="False">
                            <Setter TargetName="Bd" Property="Background" Value="{DynamicResource ControlBackgroundDisabledBrush}" />
                        </Trigger>
                        <Trigger Property="VirtualizingPanel.IsVirtualizing" Value="True">
                            <Setter TargetName="treeViewScroll" Property="CanContentScroll" Value="True" />
                        </Trigger>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
        <Style.Triggers>
            <Trigger Property="VirtualizingPanel.IsVirtualizing" Value="True">
                <Setter Property="ItemsPanel">
                    <Setter.Value>
                        <ItemsPanelTemplate>
                            <VirtualizingStackPanel />
                        </ItemsPanelTemplate>
                    </Setter.Value>
                </Setter>
            </Trigger>
        </Style.Triggers>
    </Style>



    <Style TargetType="{x:Type TreeViewItem}">
        <Setter Property="Background" Value="Transparent" />
        <Setter Property="HorizontalContentAlignment" Value="{Binding HorizontalContentAlignment, RelativeSource={RelativeSource AncestorType={x:Type ItemsControl}}}" />
        <Setter Property="VerticalContentAlignment" Value="{Binding VerticalContentAlignment, RelativeSource={RelativeSource AncestorType={x:Type ItemsControl}}}" />
        <Setter Property="Padding" Value="4" />
        <Setter Property="FontSize" Value="14" />
        <Setter Property="Foreground" Value="{DynamicResource TextPrimaryBrush}" />
        <Setter Property="FocusVisualStyle" Value="{DynamicResource FocusVisual}" />
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type TreeViewItem}">
                    <Grid>
                        <Grid.RowDefinitions>
                            <RowDefinition Height="Auto" />
                            <RowDefinition />
                        </Grid.RowDefinitions>

                        <Border
                            x:Name="Bd"
                            Background="{TemplateBinding Background}"
                            BorderBrush="{TemplateBinding BorderBrush}"
                            BorderThickness="{TemplateBinding BorderThickness}"
                            CornerRadius="4"
                            SnapsToDevicePixels="True">
                            <Grid>
                                <Grid.ColumnDefinitions>
                                    <ColumnDefinition Width="22" />
                                    <ColumnDefinition Width="auto" />
                                    <ColumnDefinition Width="*" />
                                </Grid.ColumnDefinitions>
                                <ToggleButton
                                    x:Name="Expander"
                                    ClickMode="Press"
                                    IsChecked="{Binding IsExpanded, RelativeSource={RelativeSource TemplatedParent}}"
                                    Style="{StaticResource ExpandCollapseToggleButtonStyle}" />
                                <ContentPresenter
                                    x:Name="PART_Header"
                                    Grid.Column="1"
                                    Margin="{TemplateBinding Padding}"
                                    HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
                                    ContentSource="Header"
                                    SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" />
                            </Grid>

                        </Border>
                        <!--  子对象  -->
                        <ItemsPresenter
                            x:Name="ItemsHost"
                            Grid.Row="1"
                            Margin="16,0,0,0" />
                    </Grid>
                    <ControlTemplate.Triggers>
                        <Trigger Property="IsExpanded" Value="False">
                            <Setter TargetName="ItemsHost" Property="Visibility" Value="Collapsed" />
                        </Trigger>
                        <Trigger Property="HasItems" Value="False">
                            <Setter TargetName="Expander" Property="Visibility" Value="Hidden" />
                        </Trigger>
                        <Trigger Property="IsSelected" Value="True">
                            <Setter TargetName="Bd" Property="Background" Value="{DynamicResource ControlBackgroundSelectedBrush}" />
                            <!--<Setter Property="Foreground" Value="{DynamicResource TextAccentBrush}" />-->
                            <Setter TargetName="Expander" Property="Foreground" Value="{DynamicResource TextAccentBrush}" />
                        </Trigger>
                        <Trigger Property="UIElement.IsMouseOver" Value="True">
                            <Setter TargetName="Bd" Property="Background" Value="{DynamicResource ControlBackgroundHoverBrush}" />
                        </Trigger>
                        <MultiTrigger>
                            <MultiTrigger.Conditions>
                                <Condition Property="IsSelected" Value="True" />
                                <Condition Property="IsSelectionActive" Value="False" />
                            </MultiTrigger.Conditions>
                            <Setter TargetName="Bd" Property="Background" Value="{DynamicResource ControlBackgroundSelectedBrush}" />
                            <Setter TargetName="Expander" Property="Foreground" Value="{DynamicResource TextAccentBrush}" />
                        </MultiTrigger>
                        <MultiTrigger>
                            <MultiTrigger.Conditions>
                                <Condition Property="IsSelected" Value="True" />
                                <Condition Property="UIElement.IsMouseOver" Value="True" />
                            </MultiTrigger.Conditions>
                            <Setter TargetName="Bd" Property="Background" Value="{DynamicResource ControlBackgroundPressedBrush}" />
                            <Setter TargetName="Expander" Property="Foreground" Value="{DynamicResource TextAccentBrush}" />
                        </MultiTrigger>
                        <Trigger Property="IsEnabled" Value="False">
                            <Setter Property="Foreground" Value="{DynamicResource TextDisabledBrush}" />
                        </Trigger>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
        <Style.Triggers>
            <Trigger Property="VirtualizingPanel.IsVirtualizing" Value="True">
                <Setter Property="ItemsPanel">
                    <Setter.Value>
                        <ItemsPanelTemplate>
                            <VirtualizingStackPanel />
                        </ItemsPanelTemplate>
                    </Setter.Value>
                </Setter>
            </Trigger>
        </Style.Triggers>
    </Style>


</ResourceDictionary>