我尝试使用此示例How to develop treeview with checkboxes in wpf?创建带有复选框的TreeView，但是在此示例中，您不能在另一个家庭中有一个家庭。 所以我的问题是如何创建一个不仅限于一个级别的带有复选框的完整树形视图？
这就是我所做的
IParent.cs
interface IParent<T>
{
IEnumerable<T> GetChildren();
}
DataModel.cs
using System;
using System.Collections.Generic;
using System.Windows;
public class Family : DependencyObject, IParent<object>
{
public string Name { get; set; }
public List<Person> Members { get; set; }
IEnumerable<object> IParent<object>.GetChildren()
{
return Members;
}
}
public class Person : DependencyObject
{
public string Name { get; set; }
}
ItemHelper.cs
using System.Linq;
using System.Windows;
public class ItemHelper : DependencyObject
{
public static readonly DependencyProperty IsCheckedProperty =
DependencyProperty.RegisterAttached("IsChecked", typeof(bool?), typeof(ItemHelper),
new PropertyMetadata(false, new PropertyChangedCallback(OnIsCheckedPropertyChanged)));
private static void OnIsCheckedPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
IParent<object> sect = d as IParent<object>;
DependencyObject depObj = d as DependencyObject;
if (sect != null)
{
if (((bool?)e.NewValue).HasValue)
{
foreach (DependencyObject p in sect.GetChildren())
{
SetIsChecked(p, (bool?)e.NewValue);
}
}
}
if (depObj != null)
{
var parentObject = depObj.GetValue(ParentProperty) as IParent<object>;
var parentDO = depObj.GetValue(ParentProperty) as DependencyObject;
int ch = parentObject?.GetChildren()?.Where(
x => GetIsChecked(x as DependencyObject) == true).Count() ?? 0;
int un = parentObject?.GetChildren()?.Where(
x => GetIsChecked(x as DependencyObject) == false).Count() ?? 0;
if (un > 0 && ch > 0)
{
SetIsChecked(parentDO, null);
return;
}
if (ch > 0)
{
SetIsChecked(parentDO, true);
return;
}
SetIsChecked(parentDO, false);
}
}
public static void SetIsChecked(DependencyObject element, bool? IsChecked)
{
element?.SetValue(IsCheckedProperty, IsChecked);
}
public static bool? GetIsChecked(DependencyObject element)
{
return (bool?)element?.GetValue(IsCheckedProperty);
}
public static readonly DependencyProperty ParentProperty =
DependencyProperty.RegisterAttached("Parent", typeof(object), typeof(ItemHelper));
public static void SetParent(DependencyObject element, object Parent)
{
element?.SetValue(ParentProperty, Parent);
}
public static object GetParent(DependencyObject element)
{
return element?.GetValue(ParentProperty);
}
}
MainWindow.xaml
<Window x:Class="WpfApplication102.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:WpfApplication102"
Title="MainWindow" Height="220" Width="250">
<StackPanel>
<TreeView x:Name="treeView" ItemsSource="{Binding RelativeSource={RelativeSource AncestorType=Window}, Path=Families}">
<TreeView.Resources>
<HierarchicalDataTemplate DataType="{x:Type local:Family}" ItemsSource="{Binding Members}" >
<CheckBox Content="{Binding Name}" IsChecked="{Binding Path=(local:ItemHelper.IsChecked), Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" >
<CheckBox.Style>
<Style TargetType="{x:Type CheckBox}">
<Setter Property="Foreground" Value="Black"/>
<Setter Property="Visibility" Value="Visible"/>
<Style.Triggers>
<DataTrigger Binding="{Binding Path=(local:ItemHelper.IsChecked)}" Value="False" >
<Setter Property="Foreground" Value="LightGray"/>
</DataTrigger>
</Style.Triggers>
</Style>
</CheckBox.Style>
</CheckBox>
</HierarchicalDataTemplate>
<DataTemplate DataType="{x:Type local:Person}" >
<CheckBox Content="{Binding Name}" IsChecked="{Binding Path=(local:ItemHelper.IsChecked), Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" >
<CheckBox.Style>
<Style TargetType="{x:Type CheckBox}">
<Setter Property="Foreground" Value="Black"/>
<Setter Property="Visibility" Value="Visible"/>
<Style.Triggers>
<DataTrigger Binding="{Binding Path=(local:ItemHelper.IsChecked)}" Value="False" >
<Setter Property="Foreground" Value="LightGray"/>
</DataTrigger>
</Style.Triggers>
</Style>
</CheckBox.Style>
</CheckBox>
</DataTemplate>
</TreeView.Resources>
<TreeView.ItemContainerStyle>
<Style TargetType="{x:Type TreeViewItem}">
<Setter Property="IsExpanded" Value="True"/>
</Style>
</TreeView.ItemContainerStyle>
</TreeView>
<Button Content="?" Click="Button_PrintCrew_Click" />
<TextBlock x:Name="textBoxCrew"/>
</StackPanel>
</Window>
MainWindow.xaml.cs
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Diagnostics;
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 WpfApplication102
{
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
public ObservableCollection<Family> Families { get; set; }
public MainWindow()
{
InitializeComponent();
this.Families = new ObservableCollection<Family>();
this.Families.Add(new Family() { Name = "Simpsons", Members = new List<Person>() { new Person() { Name = "Homer" }, new Person() { Name = "Bart" } } });
this.Families.Add(new Family() { Name = "Griffin", Members = new List<Person>() { new Person() { Name = "Peter" }, new Person() { Name = "Stewie" } } });
this.Families.Add(new Family() { Name = "Fry", Members = new List<Person>() { new Person() { Name = "Philip J." } } });
foreach (Family family in this.Families)
foreach (Person person in family.Members)
person.SetValue(ItemHelper.ParentProperty, family);
}
private void Button_PrintCrew_Click(object sender, RoutedEventArgs e)
{
string crew = "";
foreach (Family family in this.Families)
foreach (Person person in family.Members)
if (ItemHelper.GetIsChecked(person) == true)
crew += person.Name + ", ";
crew = crew.TrimEnd(new char[] { ',', ' ' });
this.textBoxCrew.Text = "Your crew: " + crew;
}
}
}