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WPF: A Most Useful Threading Component

, 30 Dec 2009
A threading component that shows failures/busy status and data.
using System;
using System.Collections;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Media;
using System.Windows.Shapes;
using System.Windows.Threading;
using System.Collections.ObjectModel;

namespace ThreadingComponent
    /// <summary>
    /// Simple Adorner base class that allows
    /// other Adorners to host extra UIElements in the
    /// Adornder layer within a Host Grid UIElement
    /// that this base class provides
    /// </summary>
    public class CustomAdornerBase : Adorner
        #region Data
        private ArrayList logicalChildren;
        protected readonly Grid host = new Grid();

        #region Constructor

        public CustomAdornerBase(FrameworkElement adornedCtrl)
            : base(adornedCtrl)
            host.Width = (double)adornedCtrl.ActualWidth - 5;
            host.Height = (double)adornedCtrl.ActualHeight - 5;
            host.VerticalAlignment = VerticalAlignment.Top;
            host.HorizontalAlignment = HorizontalAlignment.Stretch;
            host.Margin = new Thickness(0);


        #region Measure/Arrange

        /// <summary>
        /// Allows the control to determine how big it wants to be.
        /// </summary>
        /// <param name="constraint">A limiting size for the control.</param>
        protected override Size MeasureOverride(Size constraint)
            return constraint;

        /// <summary>
        /// Positions and sizes the control.
        /// </summary>
        /// <param name="finalSize">The actual size of the control.</param>		
        protected override Size ArrangeOverride(Size finalSize)
            Rect rect = new Rect(new Point(), finalSize);

            return finalSize;


        #region Visual Children

        /// <summary>
        /// Required for the element to be rendered.
        /// </summary>
        protected override int VisualChildrenCount
            get { return 1; }

        /// <summary>
        /// Required for the element to be rendered.
        /// </summary>
        protected override Visual GetVisualChild(int index)
            if (index != 0)
                throw new ArgumentOutOfRangeException("index");

            return host;


        #region Logical Children

        /// <summary>
        /// Required for the displayed element to inherit property values
        /// from the logical tree, such as FontSize.
        /// </summary>
        protected override IEnumerator LogicalChildren
                if (logicalChildren == null)
                    logicalChildren = new ArrayList();

                return logicalChildren.GetEnumerator();


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About the Author

Sacha Barber
Software Developer (Senior)
United Kingdom United Kingdom
I currently hold the following qualifications (amongst others, I also studied Music Technology and Electronics, for my sins)
- MSc (Passed with distinctions), in Information Technology for E-Commerce
- BSc Hons (1st class) in Computer Science & Artificial Intelligence
Both of these at Sussex University UK.

I am lucky enough to have won a few awards for Zany Crazy code articles over the years

  • Microsoft C# MVP 2014
  • Codeproject MVP 2014
  • Microsoft C# MVP 2013
  • Codeproject MVP 2013
  • Microsoft C# MVP 2012
  • Codeproject MVP 2012
  • Microsoft C# MVP 2011
  • Codeproject MVP 2011
  • Microsoft C# MVP 2010
  • Codeproject MVP 2010
  • Microsoft C# MVP 2009
  • Codeproject MVP 2009
  • Microsoft C# MVP 2008
  • Codeproject MVP 2008
  • And numerous codeproject awards which you can see over at my blog

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