WPF中TreeView的+-号和连线style的一种实现

2024年4月3日发(作者：)

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using System;

using c;

using Model;

using ;

using ;

using ;

using s;

using ls;

using ;

using nts;

using ;

using ;

using g;

using tion;

using ;

namespace TreeViewStyleDemo

{

///

/// 的交互逻辑

///

public partial class MainWindow : Window

{

public MainWindow()

{

InitializeComponent();

for (int i = 0; i < 3; i++)

{

var item = new ItemViewModel();

= "Item" + i;

en = new ObservableCollection();

for (int j = 0; j < 3; j++)

{

var sub_item = new ItemViewModel(){ Name = "SubItem" + j};

sub_en = new ObservableCollection();

for (int k = 0; k < 3; k++)

{

sub_(new ItemViewModel() { Name = "SubsubItem" + k });

}

(sub_item);

}

(item);

}

ource = items;

}

ObservableCollection items = new ObservableCollection();

private void Button_Click(object sender, RoutedEventArgs e)

{

items[0].(new ItemViewModel() { Name = "Added" });

}

}

public class ItemViewModel

{

public string Name { get; set; }

public IList Children { get; set; }

}

public class CustomPanel : StackPanel

{

protected override Size ArrangeOverride(Size arrangeSize)

{

return eOverride(arrangeSize);

}

protected override Size MeasureOverride(Size constraint)

{

return eOverride(constraint);

}

protected override void OnRender(DrawingContext dc)

{

er(dc);

if ( > 0)

{

TreeViewItem child;

Point point;

Pen pen = new Pen(LineBrush, LineThiness);

Point startPoint = new Point(Offset,0), endPoint = new Point(Offset,0);

for (int i = 0; i < - 1; i++)

{

child = Children[i] as TreeViewItem;

point = atePoint(new Point(), this);

startPoint.Y = point.Y;

endPoint.Y = point.Y + ;

ne(pen, startPoint, endPoint);

}

child = Children[ - 1] as TreeViewItem;

point = atePoint(new Point(), this);

startPoint.Y = point.Y;

if (!nded || == null || < 1)

endPoint.Y = point.Y + / 2;

else

endPoint.Y = point.Y + / / 2;

ne(pen, startPoint, endPoint);

}

}

public Brush LineBrush

{

get { return (Brush)GetValue(LineBrushProperty); }

set { SetValue(LineBrushProperty, value); }

}

public static readonly DependencyProperty LineBrushProperty =

er("LineBrush", typeof(Brush), typeof(CustomPanel), new PropertyMetadata(null));

public double LineThiness

{

get { return (double)GetValue(LineThinessProperty); }

set { SetValue(LineThinessProperty, value); }

}

public static readonly DependencyProperty LineThinessProperty = er("LineThiness", typeof(double), typeof(CustomPanel), new PropertyMetadata(0d, new PropertyChangedCallback((o,e)=>{(o as Panel).Invalidate