מצו"ב קוד לפרוייקט שלי עבור יצירת
wpf Checked-TreeView עם Binding
אשמח לקבל משוב. תודה
כמו"כ לא הצלחתי לעשות BInding ל itemsorce ישירות מה-xaml רק דרך הקוד זה עובד - אשמח לקבל הדרכה בנושא ממי שיכול.
תודה מראש.
עשיתי את זה בעיקר ללימוד - מקווה שיהיה שימושי בעז"ה לעוד מישהו חוץ ממני.
<Window x:Class="Wpf_Checked_TreeView.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:Wpf_Checked_TreeView"
mc:Ignorable="d"
Title="MainWindow" Height="450" Width="800"
DataContext="{Binding RelativeSource={RelativeSource Self}}"
>
<Grid>
<TreeView x:Name="treeView" ItemsSource="{Binding treeItemsList}">
<TreeView.Resources>
<HierarchicalDataTemplate DataType="{x:Type local:CheckedTreeItem}" ItemsSource="{Binding Children}">
<StackPanel Orientation="Horizontal">
<CheckBox Content="{Binding Name}" IsChecked="{Binding IsChecked, Mode=TwoWay}"/>
</StackPanel>
</HierarchicalDataTemplate>
</TreeView.Resources>
</TreeView>
</Grid>
</Window>
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Linq;
using System.Windows;
namespace Wpf_Checked_TreeView
{
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
public ObservableCollection<object> treeItemsList = new ObservableCollection<object>();
public MainWindow()
{
InitializeComponent();
CheckedTreeItem rootItem1 = new CheckedTreeItem { Name = "root item 1" };
CheckedTreeItem child1 = new CheckedTreeItem { Name = "child item 1"};
CheckedTreeItem child2 = new CheckedTreeItem { Name = "child item 2" };
rootItem1.AddChild(child1);
rootItem1.AddChild(child2);
child1.AddChild(new CheckedTreeItem { Name = "sub child item 1" });
child1.AddChild(new CheckedTreeItem { Name = "sub child item 2" });
child2.AddChild(new CheckedTreeItem { Name = "sub child item 1" });
child2.AddChild(new CheckedTreeItem { Name = "sub child item 2" });
CheckedTreeItem rootItem2 = new CheckedTreeItem { Name = "root item 1" };
rootItem2.AddChild(new CheckedTreeItem { Name = "child item 1" });
rootItem2.AddChild(new CheckedTreeItem { Name = "child item 1" });
treeItemsList.Add(rootItem1);
treeItemsList.Add(rootItem2);
treeView.ItemsSource = treeItemsList;
}
}
public class CheckedTreeItem : INotifyPropertyChanged
{
private ObservableCollection<CheckedTreeItem> _children = new ObservableCollection<CheckedTreeItem>();
public ObservableCollection<CheckedTreeItem> Children
{
get { return _children; }
set
{
_children = value;
OnPropertyChanged(nameof(Children));
}
}
private CheckedTreeItem _parent;
public CheckedTreeItem Parent
{
get { return _parent; }
set
{
_parent = value;
OnPropertyChanged(nameof(Parent));
}
}
private string _name;
public string Name
{
get { return _name; }
set
{
if (_name != value)
{
_name = value;
OnPropertyChanged(nameof(Name));
}
}
}
private bool? _isChecked = false;
public bool? IsChecked
{
get { return _isChecked; }
set
{
if (_isChecked != value)
{
_isChecked = value;
OnPropertyChanged(nameof(IsChecked));
UpdateChildCheckSatus(value);
UpdateParentCheckSatus(value);
}
}
}
void UpdateChildCheckSatus(bool? value)
{
foreach (CheckedTreeItem child in Children)
{
if (value != null){ child.IsChecked = value; }
}
}
void UpdateParentCheckSatus(bool? value)
{
if (Parent != null)
{
bool allChecked = Parent.Children.OfType<CheckedTreeItem>().All(child => child.IsChecked == true);
bool allUnchecked = Parent.Children.OfType<CheckedTreeItem>().All(child => child.IsChecked == false);
if (allChecked) { Parent.IsChecked = true; }
else if (allUnchecked) { Parent.IsChecked = false; }
else { Parent.IsChecked = null; }
}
}
public event PropertyChangedEventHandler PropertyChanged;
protected void OnPropertyChanged(string propertyName)
{
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
}
public void AddChild(CheckedTreeItem child)
{
if (child is CheckedTreeItem CheckedTreeItem)
{
CheckedTreeItem.Parent = this;
Children.Add(child);
}
}
}
}
