How to create trapezoid tabs in WPF tab control

Question

How to create trapezoid tabs in WPF tab control?
I\'d like to create non rectangular tabs that look like tabs in Google Chrome or like tabs in code editor of VS 2008.

Answer 1

I know this is old but I'd like to propose:

XAML:

ViewModel:

    using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Text;
    using System.Threading.Tasks;
    using System.Windows;
    using System.Windows.Shapes;
    using System.ComponentModel;
    using System.Globalization;
    using System.Windows.Media;

    namespace TrapezoidTab
    {
        public class TabHeaderViewModel : INotifyPropertyChanged
        {
            public event PropertyChangedEventHandler PropertyChanged;
            private string _tabHeaderText;
            private List _polygonPoints;
            private PointCollection _pointCollection;

            public TabHeaderViewModel(string tabHeaderText)
            {
                _tabHeaderText = tabHeaderText;
                TabPolygonPoints = GenPolygon();
            }

            public PointCollection TabPolygonPoints
            {
                get { return _pointCollection; }
                set
                {
                    _pointCollection = value;
                    if (PropertyChanged != null)
                        PropertyChanged(this, new PropertyChangedEventArgs("TabPolygonPoints"));
                }
            }

            public string TabHeaderText
            {
                get { return _tabHeaderText; }
                set
                {
                    _tabHeaderText = value;
                    TabPolygonPoints = GenPolygon();
                    if (PropertyChanged != null)
                        PropertyChanged(this, new PropertyChangedEventArgs("TabHeaderText"));
                }
            }

            private PointCollection GenPolygon()
            {
                var w = new FormattedText(_tabHeaderText, CultureInfo.GetCultureInfo("en-us"), FlowDirection.LeftToRight, new Typeface("Tahoma"), 12, Brushes.Black);
                var width = w.Width + 30;

                _polygonPoints = new List(4);
                _pointCollection = new PointCollection(4);

                _polygonPoints.Add(new Point(2, 21));
                _polygonPoints.Add(new Point(10, 2));
                _polygonPoints.Add(new Point(width, 2));
                _polygonPoints.Add(new Point(width + 8, 21));

                foreach (var point in _polygonPoints)
                    _pointCollection.Add(point);

                return _pointCollection;
            }
        }
    }

Main:

namespace TrapezoidTab
{
    /// 

    /// Interaction logic for MainWindow.xaml
    /// 
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();

            foreach (var obj in FruitTab.Items)
            {
                var tab = obj as TabItem;
                if (tab == null) continue;
                tab.DataContext = new TabHeaderViewModel(tab.Header.ToString());
            }
        }
    }
}