带有CheckBoxes WPF的TreeView [英] TreeView with CheckBoxes WPF
问题描述
我尝试了此示例如何使用使用wpf中的复选框？来创建带有复选框的TreeView，但是在此示例中，您不能在另一个家族中有一个家族。
所以我的问题是如何创建不仅限于一个级别的带有复选框的完整树状视图？
I tried this sample How to develop treeview with checkboxes in wpf? to create a TreeView with checkbox but in this example you cannot have a family in another family. So my question is how to create a full treeview with check box not only limited in one level?
这就是我所做的
IParent.cs
IParent.cs
interface IParent<T>
{
IEnumerable<T> GetChildren();
}
DataModel.cs
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
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
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
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;
}
}
}
推荐答案
与WPF开发的许多其他方面一样，如果遵循 MVVM 模式，这将变得更加容易。
Like many other aspects of WPF development, this becomes much easier if you follow the MVVM pattern.
创建一个常见的 ViewModel 基类来表示树的每个节点，并具有相同类型的集合代表节点的子代。在这里，您将包括处理父/子项的勾选/取消勾选的逻辑。然后，将 TreeView的 ItemSource 绑定到一个简单的项目集合以形成根级别。联合国视图的布局由每个不同节点类型的 HierachicalDataTemplate 定义。
Create a common ViewModel base class to represent each node of the tree, with a collection of the same type to represent the node's children. This is where you would include the logic to handle ticking / unticking the parent / child items as appropriate. The TreeView's ItemSource is then bound to a simple collection of items to form the root level. The U.I. layout of the View is defined by a HierachicalDataTemplate for each distinct node type.
我在最近的<一个href = http://peregrinesview.uk/wpf-behaviors-part-2-treeview/ rel = nofollow noreferrer>博客帖子，示例代码为此处。
I covered this in a recent blog post, with sample code here.
这篇关于带有CheckBoxes WPF的TreeView的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
