基于WPF实现面包屑控件的示例代码
WPF 实现面包屑控件
框架使用.NET4 至 .NET6
Visual Studio 2022
创建 BreadCrumbBar.xaml 设置 VirtualizingStackPanel 为水平方向显示 Orientation="Horizontal"。
创建 BreadCrumbBarItem.xaml 设置 ContentPresenter 前显示符号 > ，通过 BreadCrumbBarConvertr 转换器判断如果是当前是第 0 个则隐藏显示符 > 。
创建 BreadCrumbBar.cs 继承 ListBox 当选中时获取当前的 SelectedIndex 大于当前的设置 IsEnabled 设置 false 反之则为 true。
实现代码
1）创建 BreadCrumbBar.cs 代码如下:
using System.Collections;
using System.Collections.Specialized;
using System.Windows;
using System.Windows.Controls;
namespace WPFDevelopers.Controls
{
public class BreadCrumbBar : ListBox
{
static BreadCrumbBar()
{
DefaultStyleKeyProperty.OverrideMetadata(typeof(BreadCrumbBar), new FrameworkPropertyMetadata(typeof(BreadCrumbBar)));
}
public override void OnApplyTemplate()
{
base.OnApplyTemplate();
}
protected override void OnSelectionChanged(SelectionChangedEventArgs e)
{
base.OnSelectionChanged(e);
for (int i = 0; i <= SelectedIndex; i++)
{
var item = (ListBoxItem)ItemContainerGenerator.ContainerFromIndex(i);
if (item == null) continue;
if (!item.IsEnabled)
item.IsEnabled = true;
}
for (int i = Items.Count - 1; i > SelectedIndex; i--)
{
var item = (ListBoxItem)ItemContainerGenerator.ContainerFromIndex(i);
if (item == null) continue;
if(item.IsEnabled)
item.IsEnabled = false;
}
}
protected override bool IsItemItsOwnContainerOverride(object item)
{
return item is BreadCrumbBarItem;
}
protected override DependencyObject GetContainerForItemOverride()
{
return new BreadCrumbBarItem();
}
}
}
2）创建 BreadCrumbBarItem.cs 代码如下:
using System;
using System.Windows;
using System.Windows.Controls;
namespace WPFDevelopers.Controls
{
public class BreadCrumbBarItem : ListBoxItem
{
private static readonly Type _typeofSelf = typeof(BreadCrumbBarItem);
static BreadCrumbBarItem()
{
DefaultStyleKeyProperty.OverrideMetadata(_typeofSelf,
new FrameworkPropertyMetadata(_typeofSelf));
}
}
}
3）创建 BreadCrumbBar.xaml 代码如下:
<ResourceDictionary
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:controls="clr-namespace:WPFDevelopers.Controls"
xmlns:converts="clr-namespace:WPFDevelopers.Converts">
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="Basic/ControlBasic.xaml" />
</ResourceDictionary.MergedDictionaries>
<converts:BreadCrumbBarConvertr x:Key="WD.BreadCrumbBarConvertr" />
<Style
x:Key="WD.BreadCrumbBarItem"
BasedOn="{StaticResource WD.ControlBasicStyle}"
TargetType="{x:Type controls:BreadCrumbBarItem}">
<Setter Property="VerticalContentAlignment" Value="Center" />
<Setter Property="Padding" Value="6,0" />
<Setter Property="FontWeight" Value="SemiBold" />
<Setter Property="FontSize" Value="{StaticResource WD.TitleFontSize}" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type controls:BreadCrumbBarItem}">
<StackPanel Orientation="Horizontal">
<Path
Name="PART_PathSymbol"
Width="9"
Height="9"
Data="{StaticResource WD.BreadCrumbBarGeometry}"
Fill="{DynamicResource WD.PlaceholderTextSolidColorBrush}"
IsHitTestVisible="False"
Stretch="Uniform">
<Path.Visibility>
<MultiBinding Converter="{StaticResource WD.BreadCrumbBarConvertr}">
<Binding RelativeSource="{RelativeSource AncestorType=ListBoxItem}" />
<Binding Path="SelectedIndex" RelativeSource="{RelativeSource AncestorType=ListBox}" />
</MultiBinding>
</Path.Visibility>
</Path>
<ContentPresenter
x:Name="PART_ContentPresenter"
Margin="{TemplateBinding Padding}"
HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
VerticalAlignment="{TemplateBinding VerticalContentAlignment}"
SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"
TextElement.Foreground="{TemplateBinding Foreground}" />
</StackPanel>
<ControlTemplate.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter Property="Foreground" Value="{DynamicResource WD.PrimaryMouseOverSolidColorBrush}" />
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
<Style
x:Key="WD.BreadCrumbBar"
BasedOn="{StaticResource WD.ControlBasicStyle}"
TargetType="{x:Type controls:BreadCrumbBar}">
<Setter Property="Height" Value="40" />
<Setter Property="Margin" Value="5" />
<Setter Property="ItemsPanel">
<Setter.Value>
<ItemsPanelTemplate>
<VirtualizingStackPanel Orientation="Horizontal" />
</ItemsPanelTemplate>
</Setter.Value>
</Setter>
<Setter Property="ItemContainerStyle" Value="{StaticResource WD.BreadCrumbBarItem}" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type controls:BreadCrumbBar}">
<Border
Margin="{TemplateBinding Margin}"
Background="{TemplateBinding Background}"
BorderBrush="{TemplateBinding BorderBrush}"
BorderThickness="{TemplateBinding BorderThickness}">
<ScrollViewer Grid.Column="1" HorizontalScrollBarVisibility="Auto">
<ItemsPresenter x:Name="ItemsHost" />
</ScrollViewer>
</Border>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
<Style BasedOn="{StaticResource WD.BreadCrumbBar}" TargetType="{x:Type controls:BreadCrumbBar}" />
</ResourceDictionary>
4）创建 BreadCrumbBarConverter.cs 代码如下:
using System;
using System.Globalization;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
namespace WPFDevelopers.Converts
{
public class BreadCrumbBarConvertr : IMultiValueConverter
{
public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
{
var item = values[0] as ListBoxItem;
var listBox = ItemsControl.ItemsControlFromItemContainer(item) as ListBox;
if (listBox == null) return Visibility.Collapsed;
var arrayIndex = listBox.ItemContainerGenerator.IndexFromContainer(item);
if (arrayIndex == 0)
return Visibility.Collapsed;
return Visibility.Visible;
}
public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
{
throw new NotImplementedException();
}
}
}
5）创建 BreadCrumbBarExample.xaml 代码如下:
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
<RowDefinition />
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<wd:BreadCrumbBar
DisplayMemberPath="Text"
ItemsSource="{Binding BreadcrumbItems, RelativeSource={RelativeSource AncestorType=UserControl}}"
SelectedItem="{Binding BreadcrumbItem, RelativeSource={RelativeSource AncestorType=UserControl}}"
SelectionChanged="BreadCrumbBar_SelectionChanged" />
<Frame
Name="myFrame"
Grid.Row="1"
NavigationUIVisibility="Hidden" />
<Button
Grid.Row="2"
Width="80"
Click="btnNext_Click"
Content="Next"
Style="{StaticResource WD.SuccessPrimaryButton}" />
</Grid>
6） BreadCrumbBarExample.xaml.cs 代码如下:
using System.Collections.Generic;
using System;
using System.Windows.Controls;
using System.Collections.ObjectModel;
using System.Windows;
using System.Reflection;
namespace WPFDevelopers.Samples.ExampleViews
{
/// <summary>
/// StepExample.xaml 的交互逻辑
/// </summary>
public partial class BreadCrumbBarExample : UserControl
{
private int index = 0;
private List<BreadcrumbItem> Breadcrumbs = new List<BreadcrumbItem>();
public ObservableCollection<BreadcrumbItem> BreadcrumbItems
{
get { return (ObservableCollection<BreadcrumbItem>)GetValue(BreadcrumbItemsProperty); }
set { SetValue(BreadcrumbItemsProperty, value); }
}
public static readonly DependencyProperty BreadcrumbItemsProperty =
DependencyProperty.Register("BreadcrumbItems", typeof(ObservableCollection<BreadcrumbItem>), typeof(BreadCrumbBarExample), new PropertyMetadata(null));
public BreadcrumbItem BreadcrumbItem
{
get { return (BreadcrumbItem)GetValue(BreadcrumbItemProperty); }
set { SetValue(BreadcrumbItemProperty, value); }
}
public static readonly DependencyProperty BreadcrumbItemProperty =
DependencyProperty.Register("BreadcrumbItem", typeof(BreadcrumbItem), typeof(BreadCrumbBarExample), new PropertyMetadata(null));
public BreadCrumbBarExample()
{
InitializeComponent();
Loaded += BreadCrumbBarExample_Loaded;
}
private void BreadCrumbBarExample_Loaded(object sender, RoutedEventArgs e)
{
var breadcrumbItems = new List<BreadcrumbItem>()
{
new BreadcrumbItem() { Text = "主页" , Uri=new Uri("pack://application:,,,/WPFDevelopers.Samples;component/ExampleViews/DrawerMenu/HomePage.xaml",UriKind.Absolute ) },
new BreadcrumbItem() { Text = "Edge", Uri=new Uri("pack://application:,,,/WPFDevelopers.Samples;component/ExampleViews/DrawerMenu/EdgePage.xaml" ,UriKind.Absolute ) },
new BreadcrumbItem() { Text = "邮件", Uri=new Uri("pack://application:,,,/WPFDevelopers.Samples;component/ExampleViews/DrawerMenu/EmailPage.xaml" ,UriKind.Absolute ) },
};
Breadcrumbs = breadcrumbItems;
myFrame.Navigate(Breadcrumbs[index].Uri);
BreadcrumbItems = new ObservableCollection<BreadcrumbItem>() { Breadcrumbs[index] };
}
private void BreadCrumbBar_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
myFrame.Navigate(BreadcrumbItem.Uri);
index = BreadcrumbItems.IndexOf(BreadcrumbItem);
}
private void btnNext_Click(object sender, RoutedEventArgs e)
{
index += 1;
if (index >= Breadcrumbs.Count) return;
var model = Breadcrumbs[index];
if (BreadcrumbItems.Contains(model))
{
BreadcrumbItem = model;
return;
}
BreadcrumbItems.Add(model);
BreadcrumbItem = model;
}
}
public class BreadcrumbItem
{
public string Text { get; set; }
public Uri Uri { get; set; }
}
}
效果图
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