ShrlAlgoToolkit/Wpf.Ui.Extend/Controls/TreeComboBox/ExtendedTreeView.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Input;

namespace Wpf.Ui.Extend.Controls;
public class ExtendedTreeView : TreeView
{
    public event MouseEventHandler? OnHierarchyMouseUp;
    public event RoutedEventHandler? OnChecked;

    public static readonly DependencyProperty IsExpandedPathProperty = DependencyProperty.Register("IsExpandedPath", typeof(string), typeof(ExtendedTreeView), new PropertyMetadata());
    public static readonly DependencyProperty IsSelectedPathProperty = DependencyProperty.Register("IsSelectedPath", typeof(string), typeof(ExtendedTreeView), new PropertyMetadata());
    public static readonly DependencyProperty IsCheckedPathProperty = DependencyProperty.Register("IsCheckedPath", typeof(string), typeof(ExtendedTreeView), new PropertyMetadata());

    public string IsSelectedPath
    {
        get { return (string)GetValue(IsSelectedPathProperty); }
        set { SetValue(IsSelectedPathProperty, value); }
    }

    public string IsExpandedPath
    {
        get { return (string)GetValue(IsExpandedPathProperty); }
        set { SetValue(IsExpandedPathProperty, value); }
    }

    public string IsCheckedPath
    {
        get { return (string)GetValue(IsCheckedPathProperty); }
        set { SetValue(IsCheckedPathProperty, value); }
    }

    protected override DependencyObject GetContainerForItemOverride()
    {
        ExtendedTreeViewItem treeViewItem = null;
        if (IsCheckedPath == null)
        {
            treeViewItem = ExtendedTreeViewItem.CreateItemWithBinding(IsExpandedPath, IsSelectedPath);
        }
        else
        {
            var xtreeViewItem = CheckableTreeViewItem.CreateItemWithBinding(IsExpandedPath, IsSelectedPath, IsCheckedPath);
            xtreeViewItem.IsCheckedHandler += XtreeViewItem_IsCheckedHandler;
            treeViewItem = xtreeViewItem;
        }

        treeViewItem.OnHierarchyMouseUp += OnChildItemMouseLeftButtonUp;


        return treeViewItem;
    }

    private void XtreeViewItem_IsCheckedHandler(object sender, RoutedEventArgs e)
    {
        if (this.OnChecked != null)
        {
            this.OnChecked(sender, e);
            e.Handled = true;
        }
    }

    private void OnChildItemMouseLeftButtonUp(object sender, MouseEventArgs e)
    {
        if (this.OnHierarchyMouseUp != null)
        {
            this.OnHierarchyMouseUp(this, e);
            e.Handled = true;
        }
    }

}

public class ExtendedTreeViewItem : TreeViewItem
{
    private string isExpandedPath;
    private string isSelectedPath;

    public ExtendedTreeViewItem()
    {
        this.MouseLeftButtonUp += OnMouseLeftButtonUp;
    }

    public override void OnApplyTemplate()
    {
        base.OnApplyTemplate();
    }

    public ExtendedTreeViewItem(string isExpandedPath, string isSelectedPath)
    {
        this.isExpandedPath = isExpandedPath;
        this.isSelectedPath = isSelectedPath;
    }

    void OnMouseLeftButtonUp(object sender, MouseButtonEventArgs e)
    {
        HierarchyMouseUp(e);
    }

    protected override DependencyObject GetContainerForItemOverride()
    {
        var childItem = CreateItemWithBinding(isExpandedPath, isSelectedPath);

        childItem.MouseLeftButtonUp += OnMouseLeftButtonUp;

        return childItem;
    }

    public static ExtendedTreeViewItem CreateItemWithBinding(string isExpandedPath, string isSelectedPath)
    {
        var tvi = new ExtendedTreeViewItem(isExpandedPath, isSelectedPath);

        var expandedBinding = new Binding(isExpandedPath)
        {
            Mode = BindingMode.TwoWay
        };
        tvi.SetBinding(TreeViewItem.IsExpandedProperty, expandedBinding);

        var selectedBinding = new Binding(isSelectedPath)
        {
            Mode = BindingMode.TwoWay
        };
        tvi.SetBinding(TreeViewItem.IsSelectedProperty, selectedBinding);

        return tvi;
    }

    public event MouseEventHandler OnHierarchyMouseUp;

    protected void HierarchyMouseUp(MouseButtonEventArgs e)
    {
        if (this.OnHierarchyMouseUp != null)
        {
            this.OnHierarchyMouseUp?.Invoke(this, e);
            e.Handled = true;
        }
    }
}



public class CheckableTreeViewItem : ExtendedTreeViewItem
{
    private string isExpandedPath;
    private string isSelectedPath;
    private string isCheckedPath;
    private CheckBox? checkBox;

    public static readonly DependencyProperty IsCheckedProperty = DependencyProperty.Register("IsChecked", typeof(bool), typeof(CheckableTreeViewItem), new PropertyMetadata(false));

    static CheckableTreeViewItem()
    {
        DefaultStyleKeyProperty.OverrideMetadata(typeof(CheckableTreeViewItem), new FrameworkPropertyMetadata(typeof(CheckableTreeViewItem)));
    }

    public CheckableTreeViewItem()
    {
    }

    public override void OnApplyTemplate()
    {
        checkBox = this.GetTemplateChild("PART_CheckBox") as CheckBox;
        checkBox.Checked += CheckBox_Checked;
        checkBox.Unchecked += CheckBox_Unchecked;
        base.OnApplyTemplate();
    }

    private void CheckBox_Unchecked(object sender, RoutedEventArgs e)
    {
        if (IsCheckedHandler != null)
        {
            IsCheckedHandler?.Invoke(this, e);
            e.Handled = true;
        }
    }

    private void CheckBox_Checked(object sender, RoutedEventArgs e)
    {
        if (IsCheckedHandler != null)
        {
            IsCheckedHandler?.Invoke(this, e);
            e.Handled = true;
        }
    }

    public CheckableTreeViewItem(string isExpandedPath, string isSelectedPath, string isCheckedPath)
    {
        this.isExpandedPath = isExpandedPath;
        this.isSelectedPath = isSelectedPath;
        this.isCheckedPath = isCheckedPath;
    }

    public bool IsChecked
    {
        get { return (bool)GetValue(IsCheckedProperty); }
        set { SetValue(IsCheckedProperty, value); }
    }


    protected override DependencyObject GetContainerForItemOverride()
    {
        var childItem = CreateItemWithBinding(isExpandedPath, isSelectedPath, isCheckedPath);
        childItem.IsCheckedHandler += ChildItem_IsCheckedHandler;
        return childItem;
    }

    private void ChildItem_IsCheckedHandler(object sender, RoutedEventArgs e)
    {
        if (IsCheckedHandler != null)
        {
            IsCheckedHandler?.Invoke(sender, e);
            e.Handled = true;
        }
    }

    public static CheckableTreeViewItem CreateItemWithBinding(string isExpandedPath, string isSelectedPath, string isCheckedPath)
    {
        var tvi = new CheckableTreeViewItem(isExpandedPath, isSelectedPath, isCheckedPath);

        var expandedBinding = new Binding(isExpandedPath)
        {
            Mode = BindingMode.TwoWay
        };
        tvi.SetBinding(TreeViewItem.IsExpandedProperty, expandedBinding);

        var selectedBinding = new Binding(isSelectedPath)
        {
            Mode = BindingMode.TwoWay
        };
        tvi.SetBinding(TreeViewItem.IsSelectedProperty, selectedBinding);

        var isCheckedBinding = new Binding(isCheckedPath)
        {
            Mode = BindingMode.TwoWay
        };
        tvi.SetBinding(CheckableTreeViewItem.IsCheckedProperty, isCheckedBinding);

        return tvi;
    }

    public event RoutedEventHandler IsCheckedHandler;
}