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WPF Control Factory

, 20 Apr 2010 CPOL
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;
using System.Reflection;
using System.Windows.Controls;
using Pfz.DataTypes;

namespace Pfz.WpfControls
{
	/// <summary>
	/// Control that shows a string representation of many types, such as
	/// integers, short-integers, decimals and others. Of course, string
	/// itself is valid.
	/// </summary>
	public class StringControl:
		UserControl,
		IValueControl,
		IHasPreferredDataType,
		IValueContainer<string>,
		IValueContainer<long>,
		IValueContainer<long?>,
		IValueContainer<int>,
		IValueContainer<int?>,
		IValueContainer<short>,
		IValueContainer<short?>,
		IValueContainer<byte>,
		IValueContainer<byte?>,
		IValueContainer<sbyte>,
		IValueContainer<sbyte?>,
		IValueContainer<decimal>,
		IValueContainer<decimal?>,
		IValueContainer<EmailString>
	{
		private TextBox fTextBox = new TextBox();
		
		/// <summary>
		/// Creates a new StringControl instance.
		/// </summary>
		public StringControl()
		{
			Content = fTextBox;
		}
		
		/// <summary>
		/// Clears the internal textbox.
		/// </summary>
		public void Clear()
		{
			fTextBox.Clear();
		}
		
		/// <summary>
		/// Gets or sets a value indicating if this control is read-only.
		/// </summary>
		public bool IsReadOnly
		{
			get
			{
				return fTextBox.IsReadOnly;
			}
			set
			{
				fTextBox.IsReadOnly = value;
			}
		}
	
		/// <summary>
		/// Gets or sets the value as a simple string.
		/// </summary>
		public string Value
		{
			get
			{
				string text = fTextBox.Text;
				if (text.Length == 0)
					return null;
					
				return text;
			}
			set
			{
				fTextBox.Text = value;
			}
		}
		
		#region IValueContainer Members
			object IValueContainer.Value
			{
				get
				{
					var preferredProperty = fPreferredValueProperty;
					if (preferredProperty == null)
						return Value;
					
					return fPreferredValueProperty.GetValue(this, null);
				}
				set
				{
					if (value == null)
						Clear();
					else
						fTextBox.Text = value.ToString();
				}
			}
		#endregion

		#region IValueContainer<long> Members
			long IValueContainer<long>.Value
			{
				get
				{
					return Convert.ToInt64(Value);
				}
				set
				{
					Value = value.ToString();
				}
			}
		#endregion
		#region IValueContainer<long?> Members
			long? IValueContainer<long?>.Value
			{
				get
				{
					string value = Value;
					if (string.IsNullOrEmpty(value))
						return null;
					
					return Convert.ToInt64(value);
				}
				set
				{
					if (value.HasValue)
						Value = value.Value.ToString();
					else
						Clear();
				}
			}
		#endregion
		#region IValueContainer<int> Members
			int IValueContainer<int>.Value
			{
				get
				{
					return Convert.ToInt32(Value);
				}
				set
				{
					Value = value.ToString();
				}
			}
		#endregion
		#region IValueContainer<int?> Members
			int? IValueContainer<int?>.Value
			{
				get
				{
					string value = Value;
					if (string.IsNullOrEmpty(value))
						return null;
					
					return Convert.ToInt32(value);
				}
				set
				{
					if (value.HasValue)
						Value = value.Value.ToString();
					else
						Clear();
				}
			}
		#endregion
		#region IValueContainer<short> Members
			short IValueContainer<short>.Value
			{
				get
				{
					return Convert.ToInt16(Value);
				}
				set
				{
					Value = value.ToString();
				}
			}
		#endregion
		#region IValueContainer<short?> Members
			short? IValueContainer<short?>.Value
			{
				get
				{
					string value = Value;
					if (string.IsNullOrEmpty(value))
						return null;
					
					return Convert.ToInt16(value);
				}
				set
				{
					if (value.HasValue)
						Value = value.Value.ToString();
					else
						Clear();
				}
			}
		#endregion
		#region IValueContainer<byte> Members
			byte IValueContainer<byte>.Value
			{
				get
				{
					return Convert.ToByte(Value);
				}
				set
				{
					Value = value.ToString();
				}
			}
		#endregion
		#region IValueContainer<byte?> Members
			byte? IValueContainer<byte?>.Value
			{
				get
				{
					string value = Value;
					if (string.IsNullOrEmpty(value))
						return null;
					
					return Convert.ToByte(value);
				}
				set
				{
					if (value.HasValue)
						Value = value.Value.ToString();
					else
						Clear();
				}
			}
		#endregion
		#region IValueContainer<sbyte> Members
			sbyte IValueContainer<sbyte>.Value
			{
				get
				{
					return Convert.ToSByte(Value);
				}
				set
				{
					Value = value.ToString();
				}
			}
		#endregion
		#region IValueContainer<sbyte?> Members
			sbyte? IValueContainer<sbyte?>.Value
			{
				get
				{
					string value = Value;
					if (string.IsNullOrEmpty(value))
						return null;
					
					return Convert.ToSByte(value);
				}
				set
				{
					if (value.HasValue)
						Value = value.Value.ToString();
					else
						Clear();
				}
			}
		#endregion
		#region IValueContainer<decimal> Members
			decimal IValueContainer<decimal>.Value
			{
				get
				{
					return Convert.ToDecimal(Value);
				}
				set
				{
					Value = value.ToString();
				}
			}
		#endregion
		#region IValueContainer<decimal?> Members
			decimal? IValueContainer<decimal?>.Value
			{
				get
				{
					string value = Value;
					if (string.IsNullOrEmpty(value))
						return null;
					
					return Convert.ToDecimal(value);
				}
				set
				{
					if (value.HasValue)
						Value = value.Value.ToString();
					else
						Clear();
				}
			}
		#endregion

		#region IHasPreferredDataType Members
			private PropertyInfo fPreferredValueProperty;
			
			/// <summary>
			/// Gets or sets the data-type used by the IValueContainer.Value property.
			/// </summary>
			public Type PreferredDataType
			{
				get
				{
					var property = fPreferredValueProperty;
					if (property == null)
						return null;
					
					return property.DeclaringType;
				}
				set
				{
					if (value == null)
					{
						fPreferredValueProperty = null;
						return;
					}
					
					Type type = typeof(IValueContainer<>).MakeGenericType(value);
					PropertyInfo propertyInfo = type.GetProperty("Value");
					fPreferredValueProperty = propertyInfo;
				}
			}
		#endregion
		#region IValueContainer<EmailString> Members
			EmailString IValueContainer<EmailString>.Value
			{
				get
				{
					return new EmailString(fTextBox.Text);
				}
				set
				{
					fTextBox.Text = value.ToString();
				}
			}
		#endregion
	}
}

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This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

Paulo Zemek
Engineer Microsoft Corporation
United States United States
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.
 
Now I just started working as a Senior Software Engineer at Microsoft.
 
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 2013-2014

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