Blend 修改TreeViewItem樣式
1、用Blend for Visual Studio 2019 新建Wpf專案，拖動一個TreeView控制元件到Grid上
<Grid>
<TreeView>
<TreeViewItem Header="TreeViewItem">
<TreeViewItem Header="TreeViewItem"/>
</TreeViewItem>
<TreeViewItem Header="TreeViewItem">
<TreeViewItem Header="TreeViewItem"/>
</TreeViewItem>
</TreeView>
</Grid>
2、在繪圖視窗選中TreeViewItem，右鍵編輯模版->編輯副本
3、繪制水平、垂直虛線（參考博文）
在TreeViewItem ControlTemplate模板中增加
<!-- Connecting Lines -->
<!-- Horizontal line -->
<Rectangle x:Name="HorLn"
Margin="10,0,0,0"
Height="1"
Stroke="#FF565656"
SnapsToDevicePixels="True"
StrokeDashCap="Square"
StrokeDashOffset="1"/>
<!-- Vertical line -->
<Rectangle x:Name="VerLn"
Width="1"
Stroke="#FF565656"
Margin="0,0,-2,0"
Grid.RowSpan="2"
SnapsToDevicePixels="true"
Fill="White"
StrokeDashCap="Square"
StrokeDashArray="1,5"/>
對于當前層最后一個節點，不再畫它水平方向線以下的垂直線，這里使用到轉換器完成
class TreeViewLineConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
var item = value as TreeViewItem;
ItemsControl ic = ItemsControl.ItemsControlFromItemContainer(item);
return ic.ItemContainerGenerator.IndexFromContainer(item) == ic.Items.Count - 1;
}
public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
return false;
}
}
觸發器需增加代碼
<!-- 當前層最后一個元素不畫下方垂直線 -->
<DataTrigger Binding="{Binding RelativeSource={RelativeSource Self}, Converter={StaticResource LineConverter}}" Value=https://www.cnblogs.com/firebet/p/"true">
完整樣式代碼
<Style x:Key="TreeViewItemFocusVisual">
<Setter Property="Control.Template">
<Setter.Value>
<ControlTemplate>
<Rectangle/>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
<SolidColorBrush x:Key="TreeViewItem.TreeArrow.Static.Checked.Fill" Color="#FF595959"/>
<SolidColorBrush x:Key="TreeViewItem.TreeArrow.Static.Checked.Stroke" Color="#FF262626"/>
<SolidColorBrush x:Key="TreeViewItem.TreeArrow.MouseOver.Stroke" Color="#FF27C7F7"/>
<SolidColorBrush x:Key="TreeViewItem.TreeArrow.MouseOver.Fill" Color="#FFCCEEFB"/>
<SolidColorBrush x:Key="TreeViewItem.TreeArrow.MouseOver.Checked.Stroke" Color="#FF1CC4F7"/>
<SolidColorBrush x:Key="TreeViewItem.TreeArrow.MouseOver.Checked.Fill" Color="#FF82DFFB"/>
<PathGeometry x:Key="TreeArrow" Figures="M0,0 L0,6 L6,0 z"/>
<SolidColorBrush x:Key="TreeViewItem.TreeArrow.Static.Fill" Color="#FFFFFFFF"/>
<SolidColorBrush x:Key="TreeViewItem.TreeArrow.Static.Stroke" Color="#FF818181"/>
<Style x:Key="ExpandCollapseToggleStyle" TargetType="{x:Type ToggleButton}">
<Setter Property="Focusable" Value=https://www.cnblogs.com/firebet/p/"False"/>
</style>
<style.Triggers>
</style>
效果圖如下
4、TreeViewItem顯示圖片以及名稱
<TreeView ItemsSource="{Binding Tools}">
<TreeView.Resources>
<local:UriToImageSourceConverter x:Key="UriToImageSource"/>
</TreeView.Resources>
<TreeView.ItemTemplate>
<HierarchicalDataTemplate ItemsSource="{Binding Nodes}">
<DockPanel>
<Image Source="{Binding PicPath, Converter={StaticResource UriToImageSource}}" Width="25" Height="25"/>
<TextBlock Text="{Binding Name}" FontSize="13" VerticalAlignment="Center" Margin="3,0,0,0"/>
</DockPanel>
</HierarchicalDataTemplate>
</TreeView.ItemTemplate>
</TreeView>
Tools是資料集合，節點集合Nodes，PicPath保存圖片名稱，使用UriToImageSourceConverter轉換器轉換成BitmapImage型別顯示，
class UriToImageSourceConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
string path = (string)value;
if (string.IsNullOrEmpty(path))
{
path = "pack://application:,,,/WpfApp2;component/position.ico";//默認圖片
}
return new BitmapImage(new Uri(path, UriKind.Absolute));
}
public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
return false;
}
}
效果圖如下
完整代碼
<Window x:Class="WpfApp2.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:WpfApp2"
mc:Ignorable="d"
Title="MainWindow" Height="450" Width="800">
<Window.Resources>
<Style x:Key="TreeViewItemFocusVisual">
<Setter Property="Control.Template">
<Setter.Value>
<ControlTemplate>
<Rectangle/>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
<SolidColorBrush x:Key="TreeViewItem.TreeArrow.Static.Checked.Fill" Color="#FF595959"/>
<SolidColorBrush x:Key="TreeViewItem.TreeArrow.Static.Checked.Stroke" Color="#FF262626"/>
<SolidColorBrush x:Key="TreeViewItem.TreeArrow.MouseOver.Stroke" Color="#FF27C7F7"/>
<SolidColorBrush x:Key="TreeViewItem.TreeArrow.MouseOver.Fill" Color="#FFCCEEFB"/>
<SolidColorBrush x:Key="TreeViewItem.TreeArrow.MouseOver.Checked.Stroke" Color="#FF1CC4F7"/>
<SolidColorBrush x:Key="TreeViewItem.TreeArrow.MouseOver.Checked.Fill" Color="#FF82DFFB"/>
<PathGeometry x:Key="TreeArrow" Figures="M0,0 L0,6 L6,0 z"/>
<SolidColorBrush x:Key="TreeViewItem.TreeArrow.Static.Fill" Color="#FFFFFFFF"/>
<SolidColorBrush x:Key="TreeViewItem.TreeArrow.Static.Stroke" Color="#FF818181"/>
<Style x:Key="ExpandCollapseToggleStyle" TargetType="{x:Type ToggleButton}">
<Setter Property="Focusable" Value=https://www.cnblogs.com/firebet/p/"False"/>
</style>
<style.Triggers>
</style>
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
namespace WpfApp2
{
/// <summary>
/// MainWindow.xaml 的互動邏輯
/// </summary>
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
Tools = new List<NodeX>();
for (int i = 0; i < 5; i++)
{
Tools.Add(new NodeX()
{
Name = $"Save_{i + 1}",
PicPath = "pack://application:,,,/WpfApp2;component/Save.png",
});
for (int j = i; j < 5; j++)
{
if (Tools[i].Nodes == null)
{
Tools[i].Nodes = new List<NodeX>();
}
Tools[i].Nodes.Add(new NodeX()
{
Name = $"Exit_{i + 1}_{j + 1}",
PicPath = "pack://application:,,,/WpfApp2;component/Exit.png",
});
}
}
tree.ItemsSource = Tools;
}
public List<NodeX> Tools { get; set; }
}
class TreeViewLineConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
var item = value as TreeViewItem;
ItemsControl ic = ItemsControl.ItemsControlFromItemContainer(item);
return ic.ItemContainerGenerator.IndexFromContainer(item) == ic.Items.Count - 1;
}
public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
return false;
}
}
class UriToImageSourceConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
string path = (string)value;
if (string.IsNullOrEmpty(path))
{
path = "pack://application:,,,/WpfApp2;component/position.ico";
}
return new BitmapImage(new Uri(path, UriKind.Absolute));
}
public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
return false;
}
}
public class NodeX
{
#region Property
/// <summary>顯示內容</summary>
public string Name { get; set; }
/// <summary>顯示圖片路徑</summary>
public string PicPath { get; set; }
/// <summary>子節點，默認null</summary>
public IList<NodeX> Nodes { get; set; }
#endregion
}
}
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