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WPF Control Factory

, 20 Apr 2010
This article explains some advantages and disadvantages of factories, and shows one to use for generating WPF Controls.
WpfControlsAndSample.zip
WpfControlsAndSample
Pfz.ClassLibraries
Pfz
Caching
Collections
DataTypes
Extensions
Pfz.snk
Properties
Ranges
Threading
Pfz.WpfControls
BoundGridParts
Extensions
Pfz.WpfControls.snk
Properties
TypeConverters
WpfControlFactorySample
bin
Debug
Pfz.dll
Pfz.WpfControls.dll
WpfControlFactorySample.exe
Properties
Settings.settings
WpfControlFactorySample.suo
using System.Windows;
using System.Windows.Controls;
using Pfz.DataTypes;

namespace Pfz.WpfControls
{
	/// <summary>
	/// Control used to put a label on the top-left of another data-control.
	/// </summary>
	public class LabellerControl:
		UserControl,
		IValueControl,
		IHasDisplayName
	{
		internal IValueControl fControl;
		private Label fLabel;
		
		/// <summary>
		/// Creates a new instance of the labeller control using the given
		/// base control and the given displayName/label.
		/// </summary>
		public LabellerControl(UIElement controlToLabel, string displayName)
		{
			fControl = (IValueControl)controlToLabel;
			
			var panel = new StackPanel();
			var children = panel.Children;
		
			Label labelControl = new Label();
			labelControl.Content = displayName;
			children.Add(labelControl);
			children.Add(controlToLabel);
			fLabel = labelControl;
			
			Content = panel;
		}
	
		/// <summary>
		/// Gets the label of this labeller control.
		/// </summary>
		public string DisplayName
		{
			get
			{
				return (string)fLabel.Content;
			}
			set
			{
				fLabel.Content = value;
			}
		}

		#region IDataControl Members
			/// <summary>
			/// Clears the contents of the inner control.
			/// </summary>
			public void Clear()
			{
				fControl.Clear();
			}
			
			/// <summary>
			/// Gets or sets a value indicating if the inner control is/should be
			/// read-only.
			/// </summary>
			public bool IsReadOnly
			{
				get
				{
					return fControl.IsReadOnly;
				}
				set
				{
					fControl.IsReadOnly = value;
				}
			}
		#endregion
		#region IValueContainer Members
			/// <summary>
			/// Gets the untyped value of the inner control.
			/// </summary>
			public object Value
			{
				get
				{
					return fControl.Value;
				}
				set
				{
					fControl.Value = value;
				}
			}
		#endregion
	}
	
	/// <summary>
	/// This is a control that put's a label on top-left of another control and
	/// also supports the typed-version of the Value property.
	/// </summary>
	/// <typeparam name="T">The type of the Value property.</typeparam>
	public class LabellerControl<T>:
		LabellerControl,
		IValueContainer<T>
	{
		private IValueContainer<T> fTypedControl;
		
		/// <summary>
		/// Creates the control over another one.
		/// </summary>
		public LabellerControl(UIElement control, string displayName):
			base(control, displayName)
		{
			fTypedControl = (IValueContainer<T>)control;
		}
		
		/// <summary>
		/// Gets or sets the value with the right data-type.
		/// </summary>
		public new T Value
		{
			get
			{
				return fTypedControl.Value;
			}
			set
			{
				fTypedControl.Value = value;
			}
		}
	}
}

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About the Author

Paulo Zemek
Architect
Canada Canada
I started to program computers when I was 11 years old, as a hobbist, programming in AMOS Basic and Blitz Basic for Amiga.
At 12 I had my first try with assembler, but it was too difficult at the time. Then, in the same year, I learned C and, after learning C, I was finally able to learn assembler (for Motorola 680x0).
Not sure, but probably between 12 and 13, I started to learn C++. I always programmed "in an object oriented way", but using function pointers instead of virtual methods.
 
At 15 I started to learn Pascal at school and to use Delphi. At 16 I started my first internship (using Delphi). At 18 I started to work professionally using C++ and since then I've developed my programming skills as a professional developer in C++ and C#, generally creating libraries that help other developers do they work easier, faster and with less errors.
 
Want more info or simply want to contact me?
Take a look at: http://paulozemek.azurewebsites.net/
Or e-mail me at: paulozemek@outlook.com
 
Codeproject MVP 2012
Microsoft MVP 2013

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