关于实现Windows 7 样式 Aero TreeView 控件的具体过程可以参考如下文章
http://www.cnblogs.com/o2ds/archive/2010/06/22/1763020.html
这里主要附上完整的样式以及如何将样式应用到TreeView.ItemTemplate上。
完整样式如下：
<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:src="clr-namespace:Test;assembly=Test"> <SolidColorBrush x:Key="SelectedOutBorderBrush" Color="#84ACDD"></SolidColorBrush>
<LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0" x:Key="SelectedInnerBorderBrush">
<GradientStop Color="#F1F7FE" Offset="0"/>
<GradientStop Color="#DEEDFE" Offset="1"/>
</LinearGradientBrush>
<LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0" x:Key="SelectedBackgroundBrush">
<GradientStop Color="#EBF4FE" Offset="0"/>
<GradientStop Color="#CFE4FE" Offset="1"/>
</LinearGradientBrush> <SolidColorBrush x:Key="SelectedLostFoucsOutBorderBrush" Color="#D9D9D9"></SolidColorBrush>
<LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0" x:Key="SelectedLostFoucsInnerBorderBrush">
<GradientStop Color="#FAFAFB" Offset="0"/>
<GradientStop Color="#F0F0F0" Offset="1"/>
</LinearGradientBrush>
<LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0" x:Key="SelectedLostFoucsBackgroundBrush">
<GradientStop Color="#F8F8F8" Offset="0"/>
<GradientStop Color="#E5E5E5" Offset="1"/>
</LinearGradientBrush> <SolidColorBrush x:Key="SelectedMouseMoveOutBorderBrush" Color="#7DA2CE"></SolidColorBrush>
<LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0" x:Key="SelectedMouseMoveInnerBorderBrush">
<GradientStop Color="#EBF4FD" Offset="0"/>
<GradientStop Color="#DBEAFD" Offset="1"/>
</LinearGradientBrush>
<LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0" x:Key="SelectedMouseMoveBackgroundBrush">
<GradientStop Color="#DCEBFC" Offset="0"/>
<GradientStop Color="#C1DBFC" Offset="1"/>
</LinearGradientBrush> <SolidColorBrush x:Key="MouseMoveOutBorderBrush" Color="#B8D6FB"></SolidColorBrush>
<LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0" x:Key="MouseMoveInnerBorderBrush">
<GradientStop Color="#FCFDFE" Offset="0"/>
<GradientStop Color="#F2F7FE" Offset="1"/>
</LinearGradientBrush>
<LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0" x:Key="MouseMoveBackgroundBrush">
<GradientStop Color="#FAFBFD" Offset="0"/>
<GradientStop Color="#EBF3FD" Offset="1"/>
</LinearGradientBrush> <Style x:Key="TreeViewItemFocusVisual">
<Setter Property="Control.Template">
<Setter.Value>
<ControlTemplate>
<Rectangle/>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
<PathGeometry x:Key="TreeArrow" Figures="M0,0 L0,6 L6,0 z"/>
<Style x:Key="TreeViewArrowButtonStyle" TargetType="{x:Type ToggleButton}">
<Setter Property="Focusable" Value="False"/>
<Setter Property="Width" Value="16"/>
<Setter Property="Height" Value="16"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type ToggleButton}">
<Border Background="Transparent" Height="16" Padding="5,5,5,5" Width="16">
<Path x:Name="ExpandPath" Data="{StaticResource TreeArrow}" Fill="Transparent" Stroke="#FF989898">
<Path.RenderTransform>
<RotateTransform Angle="135" CenterY="3" CenterX="3"/>
</Path.RenderTransform>
</Path>
</Border>
<ControlTemplate.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter Property="Stroke" TargetName="ExpandPath" Value="#FF1BBBFA"/>
<Setter Property="Fill" TargetName="ExpandPath" Value="Transparent"/>
</Trigger>
<Trigger Property="IsChecked" Value="True">
<Setter Property="RenderTransform" TargetName="ExpandPath">
<Setter.Value>
<RotateTransform Angle="180" CenterY="3" CenterX="3"/>
</Setter.Value>
</Setter>
<Setter Property="Fill" TargetName="ExpandPath" Value="#FF595959"/>
<Setter Property="Stroke" TargetName="ExpandPath" Value="#FF262626"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style> <Style TargetType="{x:Type TreeViewItem}" x:Key="TreeViewItemTest">
<Setter Property="FocusVisualStyle" Value="{StaticResource TreeViewItemFocusVisual}"/>
<Setter Property="IsExpanded" Value="True"></Setter>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type TreeViewItem}">
<ControlTemplate.Resources>
<src:IndentConverter Indent="19" MarginLeft="0" x:Key="indentConverter" />
</ControlTemplate.Resources>
<StackPanel Height="Auto">
<Border x:Name="outBorder" BorderThickness="1" CornerRadius="2" Margin="1,1,2,0">
<Border x:Name="itemBorder" Padding="{TemplateBinding Padding}" Margin="0" CornerRadius="1" Background="{TemplateBinding Background}"
BorderBrush="{TemplateBinding BorderBrush}"
BorderThickness="{TemplateBinding BorderThickness}" >
<Grid Margin="{Binding Converter={StaticResource indentConverter},RelativeSource={RelativeSource TemplatedParent}}">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="19" />
<ColumnDefinition />
</Grid.ColumnDefinitions>
<ToggleButton Grid.Column="0" x:Name="ArrowButton" Style="{StaticResource TreeViewArrowButtonStyle}"
IsChecked="{Binding Path=IsExpanded, RelativeSource={RelativeSource TemplatedParent}}"
ClickMode="Press" />
<ContentPresenter Grid.Column="1" x:Name="PART_Header" ContentSource="Header" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" />
</Grid>
</Border>
</Border>
<ItemsPresenter x:Name="ItemsHost" />
</StackPanel> <ControlTemplate.Triggers>
<Trigger Property="IsExpanded" Value="False">
<Setter TargetName="ItemsHost" Property="Visibility" Value="Collapsed" />
</Trigger>
<Trigger Property="HasItems" Value="False">
<Setter TargetName="ArrowButton" Property="Visibility" Value="Hidden" />
</Trigger>
<MultiTrigger>
<MultiTrigger.Conditions>
<Condition Property="HasHeader" Value="False" />
<Condition Property="Width" Value="Auto" />
</MultiTrigger.Conditions>
<Setter TargetName="PART_Header" Property="MinWidth" Value="75" />
</MultiTrigger>
<MultiTrigger>
<MultiTrigger.Conditions>
<Condition Property="HasHeader" Value="False" />
<Condition Property="Height" Value="Auto" />
</MultiTrigger.Conditions>
<Setter TargetName="PART_Header" Property="MinHeight" Value="19" />
</MultiTrigger>
<Trigger Property="IsSelected" Value="true">
<Setter TargetName="itemBorder" Property="Background" Value="{StaticResource ResourceKey=SelectedBackgroundBrush}"/>
<Setter TargetName="itemBorder" Property="BorderBrush" Value="{StaticResource ResourceKey=SelectedInnerBorderBrush}" />
<Setter TargetName="outBorder" Property="BorderBrush" Value="{StaticResource ResourceKey=SelectedOutBorderBrush}" />
</Trigger>
<MultiTrigger>
<MultiTrigger.Conditions>
<Condition Property="IsSelected" Value="true"/>
<Condition Property="IsSelectionActive" Value="false"/>
</MultiTrigger.Conditions>
<Setter TargetName="itemBorder" Property="Background" Value="{StaticResource ResourceKey=SelectedLostFoucsBackgroundBrush}" />
<Setter TargetName="itemBorder" Property="BorderBrush" Value="{StaticResource ResourceKey=SelectedLostFoucsInnerBorderBrush}" />
<Setter TargetName="outBorder" Property="BorderBrush" Value="{StaticResource ResourceKey=SelectedLostFoucsOutBorderBrush}" />
</MultiTrigger>
<MultiTrigger>
<MultiTrigger.Conditions>
<Condition Property="IsMouseOver" Value="True" />
<Condition Property="IsSelected" Value="True" />
</MultiTrigger.Conditions>
<Setter TargetName="itemBorder" Property="Background" Value="{StaticResource ResourceKey=SelectedMouseMoveBackgroundBrush}" />
<Setter TargetName="itemBorder" Property="BorderBrush" Value="{StaticResource ResourceKey=SelectedMouseMoveInnerBorderBrush}" />
<Setter TargetName="outBorder" Property="BorderBrush" Value="{StaticResource ResourceKey=SelectedMouseMoveOutBorderBrush}" />
</MultiTrigger>
<MultiTrigger>
<MultiTrigger.Conditions>
<Condition SourceName="itemBorder" Property="IsMouseOver" Value="True" />
<Condition Property="IsSelected" Value="False" />
</MultiTrigger.Conditions>
<Setter TargetName="itemBorder" Property="Background" Value="{StaticResource ResourceKey=MouseMoveBackgroundBrush}" />
<Setter TargetName="itemBorder" Property="BorderBrush" Value="{StaticResource ResourceKey=MouseMoveInnerBorderBrush}" />
<Setter TargetName="outBorder" Property="BorderBrush" Value="{StaticResource ResourceKey=MouseMoveOutBorderBrush}" />
</MultiTrigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style> </ResourceDictionary>
然而，如果使用HierarchicalDataTemplate或者DataTemplate对TreeView的ItemTemplate进行了重写，则会发现上述样式无法应用。使用方法是设置TreeView的ItemContainerStyle属性。如：<TreeView ItemContainerStyle="{DynamicResource TreeViewItemTest}"></TreeView>。这样即可将样式应用到DataTemplate上。
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