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   源码介绍

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using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;

namespace MyCustomControls
{
	public delegate void AfterRowSelectEventHandler(object sender, DataRow SelectedRow);
	/// <summary>
	/// Summary description for MultiColumnComboPopup.
	/// </summary>
	public class MultiColumnComboPopup : System.Windows.Forms.Form
	{
		/// <summary>
		/// Required designer variable.
		/// </summary>
		private System.ComponentModel.Container components = null;
		private DataRow selectedRow = null;
		private System.Windows.Forms.ListView lstvMyView;
		private DataRow[] inputRows = null;
		private DataTable dataTable = null;
		private int mCols = 0;
		private int mRows = 0;
		private string[] columnsToDisplay = null;
		private string[][] data = null;

		public event AfterRowSelectEventHandler AfterRowSelectEvent; 
		
		
		public MultiColumnComboPopup()
		{
			InitializeComponent();
			mCols = 4;
			mRows = 0;
			InitializeGridProperties();
		}

		public MultiColumnComboPopup(DataRow[] drows) {
			InitializeComponent();
			this.inputRows = drows;
			SetDataRows(inputRows);
			this.dataTable = inputRows[0].Table;
		}

		public MultiColumnComboPopup(DataTable dtable, ref DataRow selRow, string[] colsToDisplay) {
			InitializeComponent();
			this.dataTable = dtable;
			this.selectedRow = selRow;
			this.columnsToDisplay = colsToDisplay;
			if(columnsToDisplay!=null)
				SetDataTable(dataTable,columnsToDisplay);
			else
				SetDataTable(dataTable);
		}

		/// <summary>
		/// Clean up any resources being used.
		/// </summary>
		protected override void Dispose( bool disposing )
		{
			if( disposing )
			{
				if(components != null)
				{
					components.Dispose();
				}
			}
			base.Dispose( disposing );
		}

		#region Windows Form Designer generated code
		/// <summary>
		/// Required method for Designer support - do not modify
		/// the contents of this method with the code editor.
		/// </summary>
		private void InitializeComponent()
		{
			this.lstvMyView = new System.Windows.Forms.ListView();
			this.SuspendLayout();
			// 
			// lstvMyView
			// 
			this.lstvMyView.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
			this.lstvMyView.Dock = System.Windows.Forms.DockStyle.Fill;
			this.lstvMyView.FullRowSelect = true;
			this.lstvMyView.GridLines = true;
			this.lstvMyView.HeaderStyle = System.Windows.Forms.ColumnHeaderStyle.Nonclickable;
			this.lstvMyView.MultiSelect = false;
			this.lstvMyView.Name = "lstvMyView";
			this.lstvMyView.Size = new System.Drawing.Size(292, 88);
			this.lstvMyView.TabIndex = 0;
			this.lstvMyView.View = System.Windows.Forms.View.Details;
			this.lstvMyView.KeyDown  = new System.Windows.Forms.KeyEventHandler(this.lstvMyView_KeyDown);
			this.lstvMyView.DoubleClick  = new System.EventHandler(this.lstvMyView_DoubleClick);
			// 
			// MultiColumnComboPopup
			// 
			this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
			this.ClientSize = new System.Drawing.Size(292, 88);
			this.ControlBox = false;
			this.Controls.AddRange(new System.Windows.Forms.Control[] {
																		  this.lstvMyView});
			this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None;
			this.KeyPreview = true;
			this.Name = "MultiColumnComboPopup";
			this.ShowInTaskbar = false;
			this.StartPosition = System.Windows.Forms.FormStartPosition.Manual;
			this.KeyDown  = new System.Windows.Forms.KeyEventHandler(this.MultiColumnComboPopup_KeyDown);
			this.Leave  = new System.EventHandler(this.MultiColumnComboPopup_Leave);
			this.Deactivate  = new System.EventHandler(this.MultiColumnComboPopup_Deactivate);
			this.ResumeLayout(false);

		}
		#endregion

		#region Functions
		private void InitializeGridProperties() {
			lstvMyView.Items.Clear();
			lstvMyView.Columns.Clear();
			
			//Add Data Headers
			for(int i=0;i<mCols;i  ) {
				lstvMyView.Columns.Add(columnsToDisplay[i],-1,HorizontalAlignment.Left);
			}
			
			//Add Empty Values
			for(int i=0;i<mRows;i  ) {
				ListViewItem item = new ListViewItem("");
				lstvMyView.Items.Add(item);
				for(int j=0;j<mCols;j  ) {
					item.SubItems.Add(" ");
				}
			}
			
		}

		public void SetCellValue(int Row, int Column, string ItemValue) {
			if(IsValidRowAndColumn(Row,Column)) {
				if(Column == 0) {
					lstvMyView.Items[Row].Text = ItemValue;
				}
				else {
					lstvMyView.Items[Row].SubItems[Column].Text = ItemValue;
				}
			}
		}

		public string GetCellValue(int Row, int Column) {
			if(IsValidRowAndColumn(Row,Column)) {
				if(Column == 0) {
					return lstvMyView.Items[Row].Text;
				}
				else {
					return lstvMyView.Items[Row].SubItems[Column].Text;
				}
			}
			else {
				return null;
			}
		}

		public void SetFullRow(int Row, string[] ItemValues) {
			if(IsValidRow(Row)) {
				if(ItemValues.Length > 0) {
					for(int i=0;i<ItemValues.Length;i  ) {
						SetCellValue(Row,i,ItemValues[i]);
					}
				}
				else {
					MessageBox.Show(this,"SetFullRow: Empty Values Sent","Grid Error");
				}
			}
		}

		public void SetFullRow(int Row, DataRow drow) {
			if(IsValidRow(Row)) {
				if(mCols > 0) {
					for(int i=0;i<mCols;i  ) {
						SetCellValue(Row,i,(string)drow[i]);
					}
				}
				else {
					MessageBox.Show(this,"SetFullRow: Empty Values Sent","Grid Error");
				}
			}
		}

		public void SetFullColumn(int Column, string[] ItemValues) {
			if(IsValidColumn(Column)) {
				if(ItemValues.Length > 0) {
					for(int i=0;i<lstvMyView.Items.Count;i  ) {
						SetCellValue(i,Column,ItemValues[i]);
					}
				}
				else {
					MessageBox.Show(this,"SetFullColumn: Empty Values Sent","Grid Error");
				}
			}
		}

		public string[] GetFullRow(int Row) {
			string[] ItemValues = new string[lstvMyView.Columns.Count];
			if(IsValidRow(Row)) {
				for(int i=0;i<lstvMyView.Items.Count;i  ) {
					ItemValues[i] = GetCellValue(Row,i);				
				}
				return ItemValues;
			}
			else {
				return null;
			}
		}

		public string[] GetFullColumn(int Column) {
			string[] ItemValues = new string[lstvMyView.Items.Count];
			if(IsValidColumn(Column)) {
				for(int i=0;i<lstvMyView.Items.Count;i  ) {
					ItemValues[i] = GetCellValue(i,Column);
				}
				return ItemValues;
			}
			else {
				return null;
			}
		}

		public void AddItems(string[][] ItemValues) {
			if(ItemValues.Length > 0) {
				mRows = ItemValues.Length;
				mCols = ItemValues[0].Length;
				InitializeGridProperties();
				for(int i=0;i<mRows;i  ) {
					SetFullRow(i,ItemValues[i]);
				}
			}
			else {
				MessageBox.Show(this,"AddItems: Empty Values Sent","Grid Error");
			}
		}

		public string[][] GetItems() {
			string[][] ItemValues= new string[lstvMyView.Items.Count][];
			for(int i=0;i<lstvMyView.Items.Count;i  ) {
				ItemValues[i] = GetFullRow(i);
			}
			return ItemValues;
		}

		public void SetColumnHeaderNames(string[] ColumnNames) {
			for(int i=0;i<ColumnNames.Length;i  ) {
				if(i>=lstvMyView.Columns.Count) {
					lstvMyView.Columns.Add(ColumnNames[i],25,HorizontalAlignment.Center);
					lstvMyView.Columns[i].Width = ColumnNames[i].Length * (int)Font.SizeInPoints;
				}
				else {
					lstvMyView.Columns[i].Text = ColumnNames[i];
					lstvMyView.Columns[i].Width = ColumnNames[i].Length * (int)Font.SizeInPoints;
				}
			}
		}

		public void SetColumnWidths(int[] Widths) {
			for(int i=0;i<Widths.Length;i  ) {
				if(i >= lstvMyView.Columns.Count) {
					lstvMyView.Columns.Add("",Widths[i] * (int)lstvMyView.Font.SizeInPoints ,HorizontalAlignment.Center);
				}
				else {
					lstvMyView.Columns[i].Width = Widths[i] * (int)Font.SizeInPoints;
				}
			}
		}

		public void SetColumnWidth(int Column, int ColWidth) {
			if(IsValidColumn(Column)) {
				lstvMyView.Columns[Column].Width = ColWidth * (int)Font.SizeInPoints;
			}
		}

		public void SetDataTable(DataTable dtable) {
			DataColumnCollection dcc = dtable.Columns;
			DataRowCollection drc = dtable.Rows; 
			data = new string[drc.Count][];
			string[] strarrColNames = null;
			int ictr = 0;
			
			for(int i=0;i<drc.Count;i  ) {
				data[i] = new string[dcc.Count];
			}

			foreach (DataRow dr in drc) {
				for(int i=0;i<dcc.Count;i  ) {
					data[ictr][i] = dr[i].ToString();
				}
				ictr  ;
			}

			strarrColNames = new string[dcc.Count];
			for(int i=0;i<dcc.Count;i  ) {
				strarrColNames[i] = dcc[i].ColumnName;
			}

			AddItems(data);
			//SetColumnHeaderNames(strarrColNames);
		}

		public void SetDataTable(DataTable dtable,string[] colsToDisplay) {
			DataRowCollection drc = dtable.Rows; 
			data = new string[drc.Count][];
			int ictr = 0;
			
			for(int i=0;i<drc.Count;i  ) {
				data[i] = new string[colsToDisplay.Length];
			}

			foreach (DataRow dr in drc) {
				for(int i=0;i<colsToDisplay.Length;i  ) {
					data[ictr][i] = dr[colsToDisplay[i]].ToString();
				}
				ictr  ;
			}

			AddItems(data);
			//SetColumnHeaderNames(colsToDisplay);
		}
		
		private bool IsValidRowAndColumn(int Row, int Column) {
			if(Column < 0 || Row < 0) {
				MessageBox.Show(this,"Row or Column Cannot be Negative!","Grid Error");
				return false;
			}
			else if(Row > lstvMyView.Items.Count) {
				MessageBox.Show(this,"SetCellValue: Row Out Of Range","Grid Error");	
				return false;
			}
			else if(Column > lstvMyView.Columns.Count) {
				MessageBox.Show(this,"SetCellValue: Column Out Of Range "   Column.ToString(),"Grid Error");
				return false;
			}
			else {
				return true;
			}
		}

		private bool IsValidRow(int Row) {
			if(Row < 0) {
				MessageBox.Show(this,"Row Cannot be Negative!","Grid Error");
				return false;
			}
			else if(Row > lstvMyView.Items.Count) {
				MessageBox.Show(this,"Row Out Of Range","Grid Error");	
				return false;
			}
			else {
				return true;
			}
		}

		private bool IsValidColumn(int Column) {
			if(Column < 0) {
				MessageBox.Show(this,"Column Cannot be Negative!","Grid Error");
				return false;
			}
			else if(Column > lstvMyView.Columns.Count) {
				MessageBox.Show(this,"Column Out Of Range "   Column.ToString() ,"Grid Error");
				return false;
			}
			else {
				return true;
			}
		}
		#endregion
		
		private void gridValue_SelectedIndexChanged(object sender, System.EventArgs e) {
			//
		}

		public void SetDataRows(DataRow[] drows){
			mRows = drows.Length;
			mCols = drows[0].Table.Columns.Count;
			InitializeGridProperties();
			for(int i=0;i<mRows;i  ) {
				SetFullRow(i,drows[i]);
			}
			SetColumnHeaderNames(GetColumnNames(drows[0]));
		}

		private string[] GetColumnNames(DataRow drow){
			string[] strColNames = new string[drow.Table.Columns.Count];
			for(int i=0;i<drow.Table.Columns.Count;i  ){
				strColNames[i] = drow.Table.Columns[i].ColumnName;
			}
			return strColNames;
		}

		private void MultiColumnComboPopup_Deactivate(object sender, System.EventArgs e) {
			this.Close();
		}

		private void MultiColumnComboPopup_Leave(object sender, System.EventArgs e) {
			this.Close();
		}

		private void MultiColumnComboPopup_KeyDown(object sender, System.Windows.Forms.KeyEventArgs e) {
			if(e.KeyData==Keys.Escape){
				this.Close();
			}
		}

		private void lstvMyView_KeyDown(object sender, System.Windows.Forms.KeyEventArgs e) {
			if(e.KeyData==Keys.Enter){
				if(lstvMyView.SelectedItems.Count>0){
					selectedRow = dataTable.Rows[lstvMyView.SelectedIndices[0]];
					if(AfterRowSelectEvent!=null)
						AfterRowSelectEvent(this,selectedRow);
				}
				this.Close();	
			}
		}

		private void lstvMyView_DoubleClick(object sender, System.EventArgs e) {
			if(lstvMyView.SelectedItems.Count>0){
				selectedRow = dataTable.Rows[lstvMyView.SelectedIndices[0]];
				if(AfterRowSelectEvent!=null)
					AfterRowSelectEvent(this,selectedRow);
			}
			this.Close();		
		}

		private string[] GetColumnNames(DataTable dtable){
			string[] strColNames = new string[dtable.Columns.Count];
			for(int i=0;i<dtable.Columns.Count;i  ){
				strColNames[i] = dtable.Columns[i].ColumnName;
			}
			return strColNames;
		}

		public DataRow[] InputRows{
			set{
				inputRows = value;
				if(inputRows == null)
					return;
				SetDataRows(inputRows);
			}
		}

//		public string[] NonDisplayColumnNames{
//			set{
//				
//			}
//		}
		
		public DataTable Table{
			set{
				dataTable = value;
				if(dataTable == null)
					return;
				SetDataTable(dataTable);
			}
		}

		public DataRow SelectedRow{
			get{
				return selectedRow;
			}
		}

		public int Cols {
			get {
				mCols = lstvMyView.Columns.Count;
				return mCols;
			}
		}

		public int Rows {
			get {
				mRows = lstvMyView.Items.Count;
				return mRows;
			}
		}

	}
}