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Cys_Control（六） MTreeView

说明：由于Cefsharp浏览器项目需要各类控件，故之后的一些定义控件样式会参照Edge浏览器深色主题样式开发

一、查看TreeView原样式

1、通过Blend查看TreeView原有样式

<Style x:Key="TreeViewStyle1" TargetType="{x:Type TreeView}">
    <Setter Property="Background" Value="{DynamicResource {x:Static SystemColors.WindowBrushKey}}"/>
    <Setter Property="BorderBrush" Value="{StaticResource ListBorder}"/>
    <Setter Property="BorderThickness" Value="1"/>
    <Setter Property="Padding" Value="1"/>
    <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}"/>
    <Setter Property="ScrollViewer.HorizontalScrollBarVisibility" Value="Auto"/>
    <Setter Property="ScrollViewer.VerticalScrollBarVisibility" Value="Auto"/>
    <Setter Property="ScrollViewer.PanningMode" Value="Both"/>
    <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" BorderThickness="{TemplateBinding BorderThickness}" BorderBrush="{TemplateBinding BorderBrush}" SnapsToDevicePixels="true">
                    <ScrollViewer x:Name="_tv_scrollviewer_" Background="{TemplateBinding Background}" CanContentScroll="false" Focusable="false" HorizontalScrollBarVisibility="{TemplateBinding ScrollViewer.HorizontalScrollBarVisibility}" Padding="{TemplateBinding Padding}" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" VerticalScrollBarVisibility="{TemplateBinding ScrollViewer.VerticalScrollBarVisibility}">
                        <ItemsPresenter/>
                    </ScrollViewer>
                </Border>
                <ControlTemplate.Triggers>
                    <Trigger Property="IsEnabled" Value="false">
                        <Setter Property="Background" TargetName="Bd" Value="{DynamicResource {x:Static SystemColors.ControlBrushKey}}"/>
                    </Trigger>
                    <Trigger Property="VirtualizingPanel.IsVirtualizing" Value="true">
                        <Setter Property="CanContentScroll" TargetName="_tv_scrollviewer_" 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>

View Code

原始样式由外边框Border、内部可滚动容器ScrollViewer以及子集呈现部分ItemsPresenter组成

这三部分组成了TreeView的外部结构，如下图中的树形结构样式由TreeViewItem决定

接着查看TreeViewItem的组成及样式

2、查看TreeViewItem原有样式

通过Blend编辑TreeViewItem模板副本生成如下三部分样式ExpandCollapseToggleStyle（小三角）、FocusVisualStyle（键盘焦点样式）、TreeViewItemStyle（自身样式）

ExpandCollapseToggleStyle

<Style x:Key="ExpandCollapseToggleStyle" 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="{StaticResource TreeViewItem.TreeArrow.Static.Fill}" Stroke="{StaticResource TreeViewItem.TreeArrow.Static.Stroke}">
                        <Path.RenderTransform>
                            <RotateTransform Angle="135" CenterY="3" CenterX="3"/>
                        </Path.RenderTransform>
                    </Path>
                </Border>
                <ControlTemplate.Triggers>
                    <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="{StaticResource TreeViewItem.TreeArrow.Static.Checked.Fill}"/>
                        <Setter Property="Stroke" TargetName="ExpandPath" Value="{StaticResource TreeViewItem.TreeArrow.Static.Checked.Stroke}"/>
                    </Trigger>
                    <Trigger Property="IsMouseOver" Value="True">
                        <Setter Property="Stroke" TargetName="ExpandPath" Value="{StaticResource TreeViewItem.TreeArrow.MouseOver.Stroke}"/>
                        <Setter Property="Fill" TargetName="ExpandPath" Value="{StaticResource TreeViewItem.TreeArrow.MouseOver.Fill}"/>
                    </Trigger>
                    <MultiTrigger>
                        <MultiTrigger.Conditions>
                            <Condition Property="IsMouseOver" Value="True"/>
                            <Condition Property="IsChecked" Value="True"/>
                        </MultiTrigger.Conditions>
                        <Setter Property="Stroke" TargetName="ExpandPath" Value="{StaticResource TreeViewItem.TreeArrow.MouseOver.Checked.Stroke}"/>
                        <Setter Property="Fill" TargetName="ExpandPath" Value="{StaticResource TreeViewItem.TreeArrow.MouseOver.Checked.Fill}"/>
                    </MultiTrigger>
                </ControlTemplate.Triggers>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

View Code

FocusVisualStyle

<Style x:Key="TreeViewItemFocusVisual">
    <Setter Property="Control.Template">
        <Setter.Value>
            <ControlTemplate>
                <Rectangle/>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

View Code

TreeViewItemStyle

<Style x:Key="TreeViewItemStyle1" 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="1,0,0,0"/>
    <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}"/>
    <Setter Property="FocusVisualStyle" Value="{StaticResource TreeViewItemFocusVisual}"/>
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="{x:Type TreeViewItem}">
                <Grid>
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition MinWidth="19" Width="Auto"/>
                        <ColumnDefinition Width="Auto"/>
                        <ColumnDefinition Width="*"/>
                    </Grid.ColumnDefinitions>
                    <Grid.RowDefinitions>
                        <RowDefinition Height="Auto"/>
                        <RowDefinition/>
                    </Grid.RowDefinitions>
                    <ToggleButton x:Name="Expander" ClickMode="Press" IsChecked="{Binding IsExpanded, RelativeSource={RelativeSource TemplatedParent}}" Style="{StaticResource ExpandCollapseToggleStyle}"/>
                    <Border x:Name="Bd" Background="{TemplateBinding Background}" BorderThickness="{TemplateBinding BorderThickness}" BorderBrush="{TemplateBinding BorderBrush}" Grid.Column="1" Padding="{TemplateBinding Padding}" SnapsToDevicePixels="true">
                        <ContentPresenter x:Name="PART_Header" ContentSource="Header" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/>
                    </Border>
                    <ItemsPresenter x:Name="ItemsHost" Grid.ColumnSpan="2" Grid.Column="1" Grid.Row="1"/>
                </Grid>
                <ControlTemplate.Triggers>
                    <Trigger Property="IsExpanded" Value="false">
                        <Setter Property="Visibility" TargetName="ItemsHost" Value="Collapsed"/>
                    </Trigger>
                    <Trigger Property="HasItems" Value="false">
                        <Setter Property="Visibility" TargetName="Expander" Value="Hidden"/>
                    </Trigger>
                    <Trigger Property="IsSelected" Value="true">
                        <Setter Property="Background" TargetName="Bd" Value="{DynamicResource {x:Static SystemColors.HighlightBrushKey}}"/>
                        <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.HighlightTextBrushKey}}"/>
                    </Trigger>
                    <MultiTrigger>
                        <MultiTrigger.Conditions>
                            <Condition Property="IsSelected" Value="true"/>
                            <Condition Property="IsSelectionActive" Value="false"/>
                        </MultiTrigger.Conditions>
                        <Setter Property="Background" TargetName="Bd" Value="{DynamicResource {x:Static SystemColors.InactiveSelectionHighlightBrushKey}}"/>
                        <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.InactiveSelectionHighlightTextBrushKey}}"/>
                    </MultiTrigger>
                    <Trigger Property="IsEnabled" Value="false">
                        <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}"/>
                    </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>

View Code

这里我们着重看下TreeViewItemStyle的ControlTemplate部分

<ControlTemplate TargetType="{x:Type TreeViewItem}">
    <Grid>
        <Grid.ColumnDefinitions>
            <ColumnDefinition MinWidth="19" Width="Auto"/>
            <ColumnDefinition Width="Auto"/>
            <ColumnDefinition Width="*"/>
        </Grid.ColumnDefinitions>
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto"/>
            <RowDefinition/>
        </Grid.RowDefinitions>
        <ToggleButton x:Name="Expander" ClickMode="Press" IsChecked="{Binding IsExpanded, RelativeSource={RelativeSource TemplatedParent}}" Style="{StaticResource ExpandCollapseToggleStyle}"/>
        <Border x:Name="Bd" Background="{TemplateBinding Background}" BorderThickness="{TemplateBinding BorderThickness}" BorderBrush="{TemplateBinding BorderBrush}" Grid.Column="1" Padding="{TemplateBinding Padding}" SnapsToDevicePixels="true">
            <ContentPresenter x:Name="PART_Header" ContentSource="Header" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/>
        </Border>
        <ItemsPresenter x:Name="ItemsHost" Grid.ColumnSpan="2" Grid.Column="1" Grid.Row="1"/>
    </Grid>
</ControlTemplate>

如上代码可知控件由 ToggleButton (小三角) 、ContentPresenter （头部）、ItemsPresenter （子菜单）三部分组成。

下面改变ControlTemplate 样式

二、创建 CustomControl

这里我们模拟Edge收藏夹TreeView部分

1、新建CustomControl MTreeView

public class MTreeView : System.Windows.Controls.TreeView
{
    static MTreeView()
    {
        DefaultStyleKeyProperty.OverrideMetadata(typeof(MTreeView), new FrameworkPropertyMetadata(typeof(MTreeView)));
    }
}

MTreeView资源文件如下

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                    xmlns:local="clr-namespace:Cys_CustomControls.Controls">
    <Style  TargetType="{x:Type local:MTreeView}">
        <Setter Property="Background" Value="#4A4A4A"/>
        <Setter Property="BorderBrush" Value="#4A4A4A"/>
        <Setter Property="BorderThickness" Value="1"/>
        <Setter Property="Padding" Value="1"/>
        <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}"/>
        <Setter Property="ScrollViewer.HorizontalScrollBarVisibility" Value="Auto"/>
        <Setter Property="ScrollViewer.VerticalScrollBarVisibility" Value="Auto"/>
        <Setter Property="ScrollViewer.PanningMode" Value="Both"/>
        <Setter Property="Stylus.IsFlicksEnabled" Value="False"/>
        <Setter Property="VerticalContentAlignment" Value="Center"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type local:MTreeView}">
                    <Border x:Name="Bd" BorderThickness="{TemplateBinding BorderThickness}" BorderBrush="{TemplateBinding BorderBrush}" SnapsToDevicePixels="true">
                        <ScrollViewer x:Name="_tv_scrollviewer_" Background="{TemplateBinding Background}" CanContentScroll="false" Focusable="false" HorizontalScrollBarVisibility="{TemplateBinding ScrollViewer.HorizontalScrollBarVisibility}" Padding="{TemplateBinding Padding}" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" VerticalScrollBarVisibility="{TemplateBinding ScrollViewer.VerticalScrollBarVisibility}">
                            <ItemsPresenter/>
                        </ScrollViewer>
                    </Border>
                    <ControlTemplate.Triggers>
                        <Trigger Property="IsEnabled" Value="false">
                            <Setter Property="Background" TargetName="Bd" Value="{DynamicResource {x:Static SystemColors.ControlBrushKey}}"/>
                        </Trigger>
                        <Trigger Property="VirtualizingPanel.IsVirtualizing" Value="true">
                            <Setter Property="CanContentScroll" TargetName="_tv_scrollviewer_" 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>
</ResourceDictionary>

View Code

2、新建CustomControl MTreeViewItem

public class MTreeViewItem : TreeViewItem
{
    static MTreeViewItem()
    {
        DefaultStyleKeyProperty.OverrideMetadata(typeof(MTreeViewItem), new FrameworkPropertyMetadata(typeof(MTreeViewItem)));
    }
}

MTreeViewItem资源文件如下

    <Style x:Key="ExpandCollapseToggleStyle" 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="3" Width="16">
                        <Path x:Name="ExpandPath" Data="M0,0 L0,8 L8,0 z" Fill="#FFFFFF">
                            <Path.RenderTransform>
                                <RotateTransform Angle="135" CenterY="4" CenterX="4"/>
                            </Path.RenderTransform>
                        </Path>
                    </Border>
                    <ControlTemplate.Triggers>
                        <Trigger Property="IsChecked" Value="True">
                            <Setter Property="RenderTransform" TargetName="ExpandPath">
                                <Setter.Value>
                                    <RotateTransform Angle="180" CenterY="4" CenterX="4"/>
                                </Setter.Value>
                            </Setter>
                        </Trigger>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

    <Style TargetType="{x:Type local:MTreeViewItem}">
        <Setter Property="Background" Value="Transparent"/>
        <Setter Property="HorizontalContentAlignment" Value="Stretch"/>
        <Setter Property="VerticalContentAlignment" Value="{Binding VerticalContentAlignment, RelativeSource={RelativeSource AncestorType={x:Type ItemsControl}}}"/>
        <Setter Property="Padding" Value="1,0,0,0"/>
        <Setter Property="Foreground" Value="#FFFFFF"/>
        <Setter Property="FocusVisualStyle" Value="{x:Null}"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type local:MTreeViewItem}">
                    <Grid>
                        <Grid.RowDefinitions>
                            <RowDefinition Height="Auto"/>
                            <RowDefinition/>
                        </Grid.RowDefinitions>
                        <Border x:Name="Bd" Background="{TemplateBinding Background}" HorizontalAlignment="Stretch" VerticalAlignment="Center" BorderThickness="{TemplateBinding BorderThickness}" BorderBrush="{TemplateBinding BorderBrush}"  Padding="{TemplateBinding Padding}" SnapsToDevicePixels="true">
                          <StackPanel Orientation="Horizontal">
                              <ToggleButton x:Name="Expander" ClickMode="Press" IsChecked="{Binding IsExpanded, RelativeSource={RelativeSource TemplatedParent}}" Style="{StaticResource ExpandCollapseToggleStyle}"/>
                              <Grid VerticalAlignment="Center" Height="35">
                                  <ContentPresenter VerticalAlignment="Center" x:Name="PART_Header" ContentSource="Header" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/>
                              </Grid>
                            </StackPanel>
                        </Border>
                        <Grid Grid.Row="1">
                            <ItemsPresenter x:Name="ItemsHost" Margin="10,0,0,0"/>
                        </Grid>
                    </Grid>
                    <ControlTemplate.Triggers>
                        <Trigger Property="IsExpanded" Value="false">
                            <Setter Property="Visibility" TargetName="ItemsHost" Value="Collapsed"/>
                        </Trigger>
                        <Trigger Property="HasItems" Value="false">
                            <Setter Property="Visibility" TargetName="Expander" Value="Hidden"/>
                        </Trigger>
                        <Trigger Property="IsSelected" Value="true">
                            <Setter Property="Background" TargetName="Bd" Value="#575757"/>
                        </Trigger>
                        <MultiTrigger>
                            <MultiTrigger.Conditions>
                                <Condition Property="IsSelected" Value="true"/>
                                <Condition Property="IsSelectionActive" Value="false"/>
                            </MultiTrigger.Conditions>
                            <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.InactiveSelectionHighlightTextBrushKey}}"/>
                        </MultiTrigger>
                        <Trigger Property="IsEnabled" Value="false">
                            <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}"/>
                        </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>

View Code

效果如下

与Edge菜单对比缺少图标

3、为MTreeViewItem增加 Icon

分别创建依赖属性Icon（未展开时图标）、IsExpandedIcon（展开后图标）、IconForeground（图标颜色）我们这里采用阿里字体图标

依赖属性如下：

/// <summary>
/// Icon
/// </summary>
public static readonly DependencyProperty IconProperty = DependencyProperty.Register("Icon", typeof(string), typeof(MTreeViewItem));
public string Icon
{
    get => (string)GetValue(IconProperty);
    set => SetValue(IconProperty, value);
}

/// <summary>
/// IsExpanded
/// </summary>
public static readonly DependencyProperty IsExpandedIconProperty = DependencyProperty.Register("IsExpandedIcon", typeof(string), typeof(MTreeViewItem));
public string IsExpandedIcon
{
    get => (string)GetValue(IsExpandedIconProperty);
    set => SetValue(IsExpandedIconProperty, value);
}

/// <summary>
/// IconForeground 
/// </summary>
public static readonly DependencyProperty IconForegroundProperty = DependencyProperty.Register("IconForeground", typeof(Brush), typeof(MTreeViewItem));
public Brush IconForeground
{
    get => (Brush)GetValue(IconForegroundProperty);
    set => SetValue(IconForegroundProperty, value);
}

Xaml修改如下：

 <Style TargetType="{x:Type local:MTreeViewItem}">
        <Setter Property="Background" Value="Transparent"/>
        <Setter Property="HorizontalContentAlignment" Value="Stretch"/>
        <Setter Property="VerticalContentAlignment" Value="{Binding VerticalContentAlignment, RelativeSource={RelativeSource AncestorType={x:Type ItemsControl}}}"/>
        <Setter Property="Padding" Value="1,0,0,0"/>
        <Setter Property="Foreground" Value="#FFFFFF"/>
        <Setter Property="FocusVisualStyle" Value="{x:Null}"/>
        <Setter Property="Icon" Value="&#xe903;"/>
        <Setter Property="IsExpandedIcon" Value="&#xe605;"/>
        <Setter Property="IconForeground" Value="#FFCD2C"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type local:MTreeViewItem}">
                    <Grid>
                        <Grid.RowDefinitions>
                            <RowDefinition Height="Auto"/>
                            <RowDefinition/>
                        </Grid.RowDefinitions>
                        <Border x:Name="Bd" Background="{TemplateBinding Background}" HorizontalAlignment="Stretch" VerticalAlignment="Center" BorderThickness="{TemplateBinding BorderThickness}" BorderBrush="{TemplateBinding BorderBrush}"  Padding="{TemplateBinding Padding}" SnapsToDevicePixels="true">
                            <StackPanel Orientation="Horizontal">
                                <ToggleButton x:Name="Expander" ClickMode="Press" IsChecked="{Binding IsExpanded, RelativeSource={RelativeSource TemplatedParent}}" Style="{StaticResource ExpandCollapseToggleStyle}"/>
                                <TextBlock x:Name ="PART_Icon"  Text="{TemplateBinding Icon}" Foreground="{TemplateBinding IconForeground}" VerticalAlignment="Center" Margin="5,0"/>
                                <Grid VerticalAlignment="Center" Height="35">
                                    <ContentPresenter VerticalAlignment="Center" x:Name="PART_Header" ContentSource="Header" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/>
                                </Grid>
                            </StackPanel>
                        </Border>
                        <Grid Grid.Row="1">
                            <ItemsPresenter x:Name="ItemsHost" Margin="10,0,0,0"/>
                        </Grid>
                    </Grid>
                    <ControlTemplate.Triggers>
                        <Trigger Property="IsExpanded" Value="false">
                            <Setter Property="Visibility" TargetName="ItemsHost" Value="Collapsed"/>
                        </Trigger>
                        <Trigger Property="IsExpanded" Value="True">
                            <Setter Property="Text" TargetName="PART_Icon" Value="{Binding RelativeSource={RelativeSource AncestorType=local:MTreeViewItem}, Path=IsExpandedIcon}"/>
                        </Trigger>
                        <Trigger Property="HasItems" Value="false">
                            <Setter Property="Visibility" TargetName="Expander" Value="Hidden"/>
                        </Trigger>
                        <Trigger Property="IsSelected" Value="true">
                            <Setter Property="Background" TargetName="Bd" Value="#575757"/>
                        </Trigger>
                        <MultiTrigger>
                            <MultiTrigger.Conditions>
                                <Condition Property="IsSelected" Value="true"/>
                                <Condition Property="IsSelectionActive" Value="false"/>
                            </MultiTrigger.Conditions>
                            <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.InactiveSelectionHighlightTextBrushKey}}"/>
                        </MultiTrigger>
                        <Trigger Property="IsEnabled" Value="false">
                            <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}"/>
                        </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>

View Code

Xaml中增加了一个TextBlock用于显示字体图标

在控件中引用MTreeView如下：

<baseControl:MTreeView>
    <baseControl:MTreeViewItem Header="收藏夹" Icon="&#xe6de;" IsExpandedIcon="&#xe6de;" IconForeground="#FFFFFF">
        <baseControl:MTreeViewItem Header="文本" Icon="&#xe903;">
            <baseControl:MTreeViewItem Header="文本1">
            </baseControl:MTreeViewItem>
            <baseControl:MTreeViewItem Header="文本2">
            </baseControl:MTreeViewItem>
            <baseControl:MTreeViewItem Header="文本3">
            </baseControl:MTreeViewItem>
        </baseControl:MTreeViewItem>
        <baseControl:MTreeViewItem Header="图片">
            <baseControl:MTreeViewItem Header="图片1">
            </baseControl:MTreeViewItem>
            <baseControl:MTreeViewItem Header="图片2">
            </baseControl:MTreeViewItem>
            <baseControl:MTreeViewItem Header="图片3">
            </baseControl:MTreeViewItem>
        </baseControl:MTreeViewItem>
        <baseControl:MTreeViewItem Header="视频">
            <baseControl:MTreeViewItem Header="视频1">
            </baseControl:MTreeViewItem>
            <baseControl:MTreeViewItem Header="视频2">
            </baseControl:MTreeViewItem>
            <baseControl:MTreeViewItem Header="视频3">
            </baseControl:MTreeViewItem>
        </baseControl:MTreeViewItem>
    </baseControl:MTreeViewItem>
</baseControl:MTreeView>

运行效果如下：

三、源码地址

gitee地址：https://gitee.com/sirius_machao/Cys_Controls/tree/dev/

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原文地址：https://www.cnblogs.com/mchao/p/14192196.html