www.pudn.com > CRM.rar > DataGridComboBoxColumn.cs

using System; 
using System.Windows.Forms; 
 
namespace WindowsApplication1 
{ 
	/// 
 
	/// DataGridComboBoxColumn µÄժҪ˵Ã÷¡£ 
	/// 
 
	public class DataGridComboBoxColumn : DataGridTextBoxColumn 
	{ 
		public NoKeyUpCombo ColumnComboBox; 
		private System.Windows.Forms.CurrencyManager _source; 
		private int _rowNum; 
		private bool _isEditing; 
		public static int _RowCount; 
   
		public DataGridComboBoxColumn() : base() 
		{ 
			_source = null; 
			_isEditing = false; 
			_RowCount = -1; 
  
			ColumnComboBox = new NoKeyUpCombo(); 
			ColumnComboBox.DropDownStyle = ComboBoxStyle.DropDownList; 
   
			ColumnComboBox.Leave += new EventHandler(LeaveComboBox); 
			//  ColumnComboBox.Enter += new EventHandler(ComboMadeCurrent); 
			ColumnComboBox.SelectionChangeCommitted += new EventHandler(ComboStartEditing); 
   
		} 
		private void ComboStartEditing(object sender, EventArgs e) 
		{ 
			_isEditing = true; 
			base.ColumnStartedEditing((Control) sender); 
		} 
 
		private void HandleScroll(object sender, EventArgs e) 
		{ 
			if(ColumnComboBox.Visible) 
				ColumnComboBox.Hide(); 
 
		}   
		private void LeaveComboBox(object sender, EventArgs e) 
		{ 
			if(_isEditing) 
			{ 
				SetColumnValueAtRow(_source, _rowNum, ColumnComboBox.Text); 
				_isEditing = false; 
				Invalidate(); 
			} 
			ColumnComboBox.Hide(); 
			this.DataGridTableStyle.DataGrid.Scroll -= new EventHandler(HandleScroll); 
    
		} 
 
		protected override void Edit(System.Windows.Forms.CurrencyManager source, int rowNum, System.Drawing.Rectangle bounds, bool readOnly, string instantText, bool cellIsVisible) 
		{ 
    
 
			base.Edit(source,rowNum, bounds, readOnly, instantText , cellIsVisible); 
 
			_rowNum = rowNum; 
			_source = source; 
   
			ColumnComboBox.Parent = this.TextBox.Parent; 
			ColumnComboBox.Location = this.TextBox.Location; 
			ColumnComboBox.Size = new System.Drawing.Size(this.TextBox.Size.Width, ColumnComboBox.Size.Height); 
			ColumnComboBox.SelectedIndex = ColumnComboBox.FindStringExact(this.TextBox.Text); 
			ColumnComboBox.Text =  this.TextBox.Text; 
			this.TextBox.Visible = false; 
			ColumnComboBox.Visible = true; 
			this.DataGridTableStyle.DataGrid.Scroll += new EventHandler(HandleScroll); 
    
			ColumnComboBox.BringToFront(); 
			ColumnComboBox.Focus();  
		} 
 
		protected override bool Commit(System.Windows.Forms.CurrencyManager dataSource, int rowNum) 
		{ 
			if(_isEditing) 
			{ 
				_isEditing = false; 
				SetColumnValueAtRow(dataSource, rowNum, ColumnComboBox.Text); 
			} 
			return true; 
		} 
 
		protected override void ConcedeFocus() 
		{ 
			Console.WriteLine("ConcedeFocus"); 
			base.ConcedeFocus(); 
		} 
 
		protected override object GetColumnValueAtRow(System.Windows.Forms.CurrencyManager source, int rowNum) 
		{ 
 
			object s =  base.GetColumnValueAtRow(source, rowNum); 
			System.Data.DataView dv = (System.Data.DataView)this.ColumnComboBox.DataSource; 
			int rowCount = dv.Count; 
			int i = 0; 
			while (i < rowCount) 
			{ 
				if( s.Equals( dv[i][this.ColumnComboBox.ValueMember])) 
					break; 
				++i; 
			} 
    
			if(i < rowCount) 
				return dv[i][this.ColumnComboBox.DisplayMember]; 
    
			return DBNull.Value; 
		} 
 
		protected override void SetColumnValueAtRow(System.Windows.Forms.CurrencyManager source, int rowNum, object value) 
		{ 
			object s = value; 
 
			System.Data.DataView dv = (System.Data.DataView)this.ColumnComboBox.DataSource; 
			int rowCount = dv.Count; 
			int i = 0; 
			while (i < rowCount) 
			{ 
				if( s.Equals( dv[i][this.ColumnComboBox.DisplayMember])) 
					break; 
				++i; 
			} 
			if(i < rowCount) 
				s =  dv[i][this.ColumnComboBox.ValueMember]; 
			else 
				s = DBNull.Value; 
			base.SetColumnValueAtRow(source, rowNum, s); 
 
		} 
	} 
 
  
 
	public class NoKeyUpCombo : ComboBox 
	{ 
		private const int WM_KEYUP = 0x101; 
 
		protected override void WndProc(ref System.Windows.Forms.Message m) 
		{ 
			if(m.Msg == WM_KEYUP) 
			{ 
				return; 
			} 
			base.WndProc(ref m); 
		} 
	} 
 
}