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   源码介绍

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自定义属性网格

using System;
using System.Collections; 
using System.Resources;
using System.Windows.Forms;


namespace PropertyGridFormattedEntries
{
	#region CustomPropertyGridHeader
	//************************************************************
	//  Type Name: CustomPropertyGrid
	/// <summary>
	/// Summary description for CustomPropertyGrid.
	/// </summary>
	/// 
	/// <remarks></remarks>
	/// 
	/// <authorName>Krzysztof J. Stoj</authorName>
	/// <creationDate>February 3, 2005</creationDate>
	//************************************************************
	#endregion CustomPropertyGridHeader
	public class CustomPropertyGrid: System.Windows.Forms.PropertyGrid
	{
		private System.Windows.Forms.Control.ControlCollection gridControls = null;
		private TextBox m_TextBox = null; 	
		private int lastSelection;
		private string formatingString = "";
		private char formatSeparator = '.';
		#region PROPERTIES
		#endregion PROPERTIES

		#region METHODS
		#region CustomPropertyGrid Method
		//************************************************************
		//  Method Name: CustomPropertyGrid
		/// <summary>
		/// 
		/// </summary>
		/// 
		/// <remarks></remarks>
		/// 
		/// <authorName>Krzysztof J. Stoj</authorName>
		/// <creationDate>February 4, 2005</creationDate>
		//************************************************************
		public CustomPropertyGrid() : base() 
		{
		}
		#endregion CustomPropertyGrid Method

		#region OnSelectedGridItemChanged Method
		//************************************************************
		//  Method Name: OnSelectedGridItemChanged
		/// <summary>
		/// 
		/// </summary>
		/// 
		/// <remarks></remarks>
		/// 
		/// <param name="e"></param>
		/// 
		/// <authorName>Krzysztof J. Stoj</authorName>
		/// <creationDate>February 14, 2005</creationDate>
		//************************************************************
		protected override void OnSelectedGridItemChanged(SelectedGridItemChangedEventArgs e)
		{
			Control  activeControl;
			GridItem selectedItem;

			activeControl = base.ActiveControl;
			selectedItem  = base.SelectedGridItem;
			if( activeControl != null && selectedItem != null )
			{
				this.SetupPropertyStyle( activeControl, selectedItem );
			}
			
			if (m_TextBox != null ) 
			{
				m_TextBox.TextChanged -= new EventHandler(m_TextBox_TextChanged);
			}

			if( m_TextBox == null )
			{
				foreach (Control control in base.ActiveControl.Controls) 
				{
					if (control.GetType().ToString() == "System.Windows.Forms.PropertyGridInternal.PropertyGridView GridViewEdit" )
					{
						if (control is TextBox) 
						{
							m_TextBox = control as TextBox; 
							break;	
						}
					}
				}
			}

			foreach( System.Attribute attribute in selectedItem.PropertyDescriptor.Attributes )
			{
				if( attribute.GetType() == typeof(PropertyViewFormatAttribute) )
				{
					if( ( ((PropertyViewFormatAttribute)attribute).AttributeFlags & PropertyViewAttributeEnum.PropertyViewAttributes.FormattedField)
						== PropertyViewAttributeEnum.PropertyViewAttributes.FormattedField )
					{
						if( m_TextBox != null )
						{
							lastSelection = m_TextBox.SelectionStart;
							m_TextBox.TextChanged  = new EventHandler(m_TextBox_TextChanged);
						}
						break;
					}
				}
			}

			base.OnSelectedGridItemChanged (e);
		}
		#endregion OnSelectedGridItemChanged Method


		#region OnSelectedObjectsChanged Method
		//************************************************************
		//  Method Name: OnSelectedObjectsChanged
		/// <summary>
		/// 
		/// </summary>
		/// 
		/// <remarks></remarks>
		/// 
		/// <param name="e"></param>
		/// 
		/// <authorName>Krzysztof J. Stoj</authorName>
		/// <creationDate>March 10, 2005</creationDate>
		//************************************************************
		protected override void OnSelectedObjectsChanged(EventArgs e)
		{

			if( this.SelectedObject is IPropertyGrid )
			{
				this.formatingString = ((IPropertyGrid)this.SelectedObject).FormatString;
				this.formatSeparator = ((IPropertyGrid)this.SelectedObject).FormatSeparator;
			}

			if( gridControls != null )
                this.ResetPropertyStyle( gridControls );
			
			base.OnSelectedObjectsChanged (e);
		}
		#endregion OnSelectedObjectsChanged Method



		#region m_TextBox_TextChanged Method
		//************************************************************
		//  Method Name: m_TextBox_TextChanged
		/// <summary>
		/// 
		/// </summary>
		/// 
		/// <remarks>
		/// KJS
		/// This method is called automatically when the selection in the grid is changed.
		/// This is outside the control of the logic in this class.
		/// The grid internaly sets the value of the TextBox on the grid selection change 
		/// which invokes this call-back automatically.
		/// This causes problems since the current text can be erased by the formatted string.
		/// To prevent this from happening the grid internal property "Modified" is used.
		/// See below for details
		/// </remarks>
		/// 
		/// <param name="sender"></param>
		/// <param name="e"></param>
		/// 
		/// <authorName>Krzysztof J. Stoj</authorName>
		/// <creationDate>November 23, 2005</creationDate>
		//************************************************************
		private void m_TextBox_TextChanged(object sender, EventArgs e)
		{
			System.Text.StringBuilder newText;
			string oldText = this.m_TextBox.Text;
			int stringLen = this.m_TextBox.Text.Length;
			int currentSelection = this.m_TextBox.SelectionStart;
			

			//
			// KJS. Get the caller type.
			//
			System.Type senderType = sender.GetType();

			//
			// KJS. It was established that the caller has "Modified" property.
			//      This property is set only when the data was modified, not when the
			//      data is originally setup.
			//      Since this is very usefull information we are looking for this property.
			System.Reflection.PropertyInfo property =  senderType.GetProperty( "Modified" );
			
			//
			// KJS. Now get the property value
			//
			bool mod = (bool)property.GetValue( sender, null );

			//
			// KJS. Proceed with formatting only if data was actually changed
			//      which is indicated by set "Modified" property.
			//
			if( !mod )
				return;

			newText = new System.Text.StringBuilder(formatingString.Length);

			//
			// KJS. The string can only be as loong as the format allows
			//
			for( int i = 0, j = 0; i < formatingString.Length; i   )
			{
				if( i < stringLen )
				{
					if( oldText[i] >= '0' && oldText[i] <= '9' )
					{
						if( formatingString[i] == formatSeparator )
						{
							newText.Insert( j, formatingString[i] );
							j  ;
							newText.Insert( j, oldText[i] );
							if( this.lastSelection < currentSelection )
								currentSelection  ;
							else
								currentSelection--;
						}
						else
						{
							newText.Insert( j, oldText[i] );
						}
					}
					else
						newText.Insert( j, formatingString[i] );
				}
				else
					newText.Insert( j, formatingString[i] );
				j  ;
			}
			this.m_TextBox.Text = newText.ToString();
			if( currentSelection < 0 )
				currentSelection = 0;
			this.m_TextBox.Select(currentSelection, 0);
			this.lastSelection = currentSelection;
		}
		#endregion m_TextBox_TextChanged Method



		#region SetupPropertyStyle Method
		//************************************************************
		//  Method Name: SetupPropertyStyle
		/// <summary>
		/// 
		/// </summary>
		/// 
		/// <remarks></remarks>
		/// 
		/// <param name="thisControl"></param>
		/// <param name="viewItem"></param>
		/// 
		/// <authorName>Krzysztof J. Stoj</authorName>
		/// <creationDate>February 14, 2005</creationDate>
		//************************************************************
		private void SetupPropertyStyle(Control thisControl, GridItem viewItem)
		{
			bool passwordField;
			System.ComponentModel.PropertyDescriptor viewProperty;
			System.ComponentModel.AttributeCollection attributes;
			System.Windows.Forms.Control.ControlCollection controls = thisControl.Controls;

			gridControls = controls;
			viewProperty = viewItem.PropertyDescriptor;
			attributes = viewProperty.Attributes;
			passwordField = false;

			foreach( System.Attribute attribute in attributes )
			{
				if( attribute.GetType() == typeof(PropertyViewFormatAttribute) )
				{
					if( ( ((PropertyViewFormatAttribute)attribute).AttributeFlags & PropertyViewAttributeEnum.PropertyViewAttributes.PasswordField)
						== PropertyViewAttributeEnum.PropertyViewAttributes.PasswordField )
					{
						passwordField = true;
						break;
					}
				}
			}

			if( passwordField )
			{
				foreach( Control control in controls )
				{
					System.Type baseType = control.GetType().BaseType;

					System.Reflection.PropertyInfo passwordCharProperty = baseType.GetProperty( "PasswordChar" );
					if( passwordCharProperty != null )
						passwordCharProperty.SetValue( control, '*', null );
				}
			}
			else
			{
				foreach( Control control in controls )
				{
					System.Type baseType = control.GetType().BaseType;

					System.Reflection.PropertyInfo passwordCharProperty = baseType.GetProperty( "PasswordChar" );
					if( passwordCharProperty != null )
						passwordCharProperty.SetValue( control, null, null );
				}			
			}
		}
		#endregion SetupPropertyStyle Method

		#region ResetPropertyStyle Method
		//************************************************************
		//  Method Name: ResetPropertyStyle
		/// <summary>
		/// 
		/// </summary>
		/// 
		/// <remarks></remarks>
		/// 
		/// <param name="thisControls"></param>
		/// 
		/// <authorName>Krzysztof J. Stoj</authorName>
		/// <creationDate>March 10, 2005</creationDate>
		//************************************************************
		private void ResetPropertyStyle(System.Windows.Forms.Control.ControlCollection thisControls)
		{
			foreach( Control control in thisControls )
			{
				System.Type baseType = control.GetType().BaseType;

				System.Reflection.PropertyInfo passwordCharProperty = baseType.GetProperty( "PasswordChar" );
				if( passwordCharProperty != null )
					passwordCharProperty.SetValue( control, null, null );
			}
		}
		#endregion ResetPropertyStyle Method

		#endregion METHODS

	}
}