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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.Windows.Controls;
using Pfz.DataTypes;

namespace Pfz.WpfControls
{
	/// <summary>
	/// Control used to edit Times without dates.
	/// </summary>
	public class TimeControl:
		UserControl,
		IValueControl,
		IValueContainer<Time>,
		IValueContainer<Time?>,
		IHasPreferredDataType
	{
		private ComboBox fComboHour = new ComboBox { Width = 50 };
		private ComboBox fComboMinute = new ComboBox { Width = 50 };
		private ComboBox fComboSecond = new ComboBox { Width = 50 };
		
		/// <summary>
		/// Creates a new TimeControl.
		/// </summary>
		public TimeControl()
		{
			var stackPanel = new StackPanel();
			stackPanel.Orientation = Orientation.Horizontal;
			
			var gridChildren = stackPanel.Children;
			gridChildren.Add(fComboHour);
			gridChildren.Add(fComboMinute);
			gridChildren.Add(fComboSecond);
			
			p_AddValues(fComboHour, 24);
			p_AddValues(fComboMinute, 60);
			p_AddValues(fComboSecond, 60);
			
			Content = stackPanel;
		}

		private void p_AddValues(ComboBox combo, int count)
		{
			var items = combo.Items;
			for (int i=0; i<count; i++)
				items.Add(i);
		}
	
		private Type fPreferredDataType = typeof(Time);
		/// <summary>
		/// Gets or sets the preferred type for this control.
		/// </summary>
		public Type PreferredDataType
		{
			get
			{
				return fPreferredDataType;
			}
			set
			{
				if (value == fPreferredDataType)
					return;
				
				if (value == typeof(Time))
				{
					fComboHour.Items.RemoveAt(0);
					fPreferredDataType = value;
					return;
				}
				
				if (value == typeof(Time?))
				{
					fComboHour.Items.Insert(0, "");
					fPreferredDataType = value;
					return;
				}
				
				throw new ArgumentException("PreferredDataType must be Time or Nullable<Time>.");
			}
		}

		/// <summary>
		/// Clears the value of this control.
		/// </summary>
		public void Clear()
		{
			fComboHour.SelectedIndex = 0;
			fComboMinute.SelectedIndex = 0;
			fComboSecond.SelectedIndex = 0;
		}

		/// <summary>
		/// Gets or sets a value indicating if this control is read-only.
		/// </summary>
		public bool IsReadOnly
		{
			get
			{
				return !fComboHour.IsEnabled;
			}
			set
			{
				fComboHour.IsEnabled = !value;
				fComboMinute.IsEnabled = !value;
				fComboSecond.IsEnabled = !value;
			}
		}

		/// <summary>
		/// Gets or sets the value of this control.
		/// </summary>
		public Time? Value
		{
			get
			{
				var hour = fComboHour.SelectedValue;
				
				if (hour == null || hour.Equals(""))
					return null;
				
				return new Time(Convert.ToInt32(hour), fComboMinute.SelectedIndex, fComboSecond.SelectedIndex, 0);
			}
			set
			{
				if (!value.HasValue)
				{
					Clear();
					return;
				}
				
				var time = value.Value;
				fComboHour.SelectedValue = time.Hour;
				fComboMinute.SelectedIndex = time.Minute;
				fComboSecond.SelectedIndex = time.Second;
			}
		}
		
		#region IValueContainer Members
			object IValueContainer.Value
			{
				get
				{
					return Value;
				}
				set
				{
					Value = (Time?)value;
				}
			}
		#endregion
		#region IValueContainer<Time> Members
			Time IValueContainer<Time>.Value
			{
				get
				{
					return (Time)Value;
				}
				set
				{
					Value = value;
				}
			}
		#endregion
	}
}

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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, 2015
Microsoft MVP 2013-2014

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