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How to develop treeview with checkboxes in wpf?

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小蘑菇
小蘑菇 2020-12-16 21:41

I have a requirement that , I need to add nodes to a TreeView dynamically and that nodes with CheckBoxes. If one CheckBox is selected

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  • 长情又很酷
    长情又很酷 (楼主)
    2020-12-16 22:26

    I added onto @pr0gg3r's answer to make it generic. I'm not sure if this is necessarily the best way, but it's a little more flexible.

    MainWindow is the same, but the other classes differ slightly.

    IParent.cs

    interface IParent
{
    IEnumerable GetChildren();
}

    DataModel.cs

    using System;
using System.Collections.Generic;
using System.Windows;

public class Family : DependencyObject, IParent
{
    public string Name { get; set; }
    public List Members { get; set; }

    IEnumerable IParent.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 sect = d as IParent;
        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;
            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);
    }
}

    
    
             
    
                                                        
    
            
            
    
              
                
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