using System.Collections;
using System.ComponentModel;
using System.Drawing;
using System.Windows.Forms;
using System.Data;
namespace Common
{
public class DataGridComboBoxColumnStyle: DataGridColumnStyle
{
private int xMargin = 2;
private int yMargin =1;
private ComboBox Combo;
private string _DisplayMember;
private string _ValueMember;
private string OldVal = String.Empty;
private bool InEdit = false;
public DataGridComboBoxColumnStyle(DataTable DataSource, int DisplayMember,int ValueMember)
{
Combo = new ComboBox();
_DisplayMember = DataSource.Columns[DisplayMember].ToString();
_ValueMember = DataSource.Columns[ValueMember].ToString();
Combo.SelectedIndexChanged += new System.EventHandler(this.Combo_SelectedIndexChanged);
Combo.Visible = false;
Combo.DataSource = DataSource;
Combo.DisplayMember = _DisplayMember;
Combo.ValueMember = _ValueMember;
}
public DataGridComboBoxColumnStyle(DataTable DataSource, string DisplayMember,string ValueMember)
{
Combo = new ComboBox();
Combo.SelectedIndexChanged += new System.EventHandler(this.Combo_SelectedIndexChanged);
Combo.Visible = false;
Combo.DataSource = DataSource;
Combo.DisplayMember = DisplayMember;
Combo.ValueMember = ValueMember;
}
protected override void Abort(int RowNum)
{
RollBack();
HideComboBox();
EndEdit();
}
protected override bool Commit(CurrencyManager DataSource, int RowNum)
{
HideComboBox();
if(!InEdit)
return true;
try
{
Object Value = Combo.SelectedValue;
Object Text = Combo.SelectedText;
if(Text.ToString()!=String.Empty)
{
if(Value!=null)
{
if(NullText.Equals(Value))
{
Value = Convert.DBNull;
}
SetColumnValueAtRow(DataSource, RowNum, Value);
}
else
return true;
}
}
catch(Exception e)
{
RollBack();
return false;
}
EndEdit();
return true;
}
CurrencyManager cm;
int rowNum;
private void Combo_SelectedIndexChanged(object sender, System.EventArgs e)
{
try
{
if(this.InEdit)
{
if(Combo!=null)
{
Object Value = Combo.SelectedValue;
if(Value!=null)
{
if(NullText.Equals(Value))
{
Value = Convert.DBNull;
}
SetColumnValueAtRow(cm, rowNum, Value);
}
}
}
}
catch( System.Exception ex)
{
throw ex;
}
}
protected override void ConcedeFocus()
{
Combo.Visible = false;
}
protected override void Edit(CurrencyManager Source,int Rownum,Rectangle Bounds,bool ReadOnly,string InstantText, bool CellIsVisible)
{
cm=Source;
rowNum=Rownum;
try
{
Combo.Text = String.Empty;
Rectangle OriginalBounds = Bounds;
OldVal = Combo.Text;
if(CellIsVisible)
{
Bounds.Offset(xMargin, yMargin);
Bounds.Width -= xMargin * 2;
Bounds.Height -= yMargin;
Combo.Bounds = Bounds;
Combo.Visible = true;
}
else
{
Combo.Bounds = OriginalBounds;
Combo.Visible = false;
}
Combo.Text =GetText(GetColumnValueAtRow(Source, Rownum));
Combo.RightToLeft = this.DataGridTableStyle.DataGrid.RightToLeft;
Combo.Focus();
if( Combo.Visible)
DataGridTableStyle.DataGrid.Invalidate(OriginalBounds);
InEdit = true;
}
catch(Exception ex)
{
string m=ex.Message;
}
}
protected override int GetMinimumHeight()
{
return Combo.PreferredHeight + yMargin;
}
protected override int GetPreferredHeight(Graphics g, Object Value)
{
int NewLineIndex = 0;
int NewLines = 0;
string ValueString = this.GetText(Value);
while(NewLineIndex != -1)
{
NewLineIndex = ValueString.IndexOf("r ", NewLineIndex + 1);
NewLines += 1;
}
return FontHeight * NewLines + yMargin;
}
protected override Size GetPreferredSize(Graphics g, Object Value)
{
Size Extents = Size.Ceiling(g.MeasureString(GetText(Value), this.DataGridTableStyle.DataGrid.Font));
Extents.Width += xMargin * 2 + DataGridTableGridLineWidth;
Extents.Height += yMargin;
return Extents;
}
protected override object GetColumnValueAtRow(System.Windows.Forms.CurrencyManager source, int rowNum)
{
object s = base.GetColumnValueAtRow(source, rowNum);
DataTable dv = (DataTable)Combo.DataSource;
int rowCount = dv.Rows.Count;
int i = 0;
while (i < rowCount)
{
if( s.ToString().Trim().Equals( dv.Rows[i][Combo.ValueMember].ToString().Trim()))
break;
++i;
}
if(i < rowCount)
return dv.Rows[i][Combo.DisplayMember];
return DBNull.Value;
}
protected override void Paint(Graphics g ,Rectangle Bounds,CurrencyManager Source,int RowNum)
{
Paint(g, Bounds, Source, RowNum, false);
}
protected override void Paint(Graphics g ,Rectangle Bounds ,CurrencyManager Source ,int RowNum,bool AlignToRight)
{
string Text = GetText(GetColumnValueAtRow(Source, RowNum));
PaintText(g, Bounds, Text, AlignToRight);
}
protected override void Paint(Graphics g ,Rectangle Bounds ,CurrencyManager Source,int RowNum,Brush BackBrush,Brush ForeBrush,bool AlignToRight)
{
string Text = GetText(GetColumnValueAtRow(Source, RowNum));
PaintText(g, Bounds, Text, BackBrush, ForeBrush, AlignToRight);
}
protected override void SetDataGridInColumn(DataGrid Value)
{
base.SetDataGridInColumn(Value);
if(Combo.Parent!=Value)
{
if(Combo.Parent!=null)
Combo.Parent.Controls.Remove(Combo);
}
if(Value !=null)
Value.Controls.Add(Combo);
}
protected override void UpdateUI(CurrencyManager Source , int RowNum,string InstantText)
{
Combo.Text = GetText(GetColumnValueAtRow(Source, RowNum));
if(InstantText!=null)
Combo.Text = InstantText;
}
private int DataGridTableGridLineWidth
{
get
{
if(DataGridTableStyle.GridLineStyle == DataGridLineStyle.Solid)
return 1;
else
return 0;
}
}
private void EndEdit()
{
InEdit = false;
Invalidate();
}
private string GetText(Object Value)
{
if(Value==System.DBNull.Value)
return NullText;
if(Value!=null)
return Value.ToString();
else
return String.Empty;
}
private void HideComboBox()
{
if( Combo.Focused)
this.DataGridTableStyle.DataGrid.Focus();
Combo.Visible = false;
}
private void RollBack()
{
Combo.Text = OldVal;
}
private void PaintText(Graphics g, Rectangle Bounds,string Text,bool AlignToRight)
{
Brush BackBrush = new SolidBrush(DataGridTableStyle.BackColor);
Brush ForeBrush = new SolidBrush(DataGridTableStyle.ForeColor);
PaintText(g, Bounds, Text, BackBrush, ForeBrush, AlignToRight);
}
private void PaintText(Graphics g , Rectangle TextBounds,string Text,Brush BackBrush,Brush ForeBrush,bool AlignToRight)
{
Rectangle Rect = TextBounds;
RectangleF RectF = (RectangleF)(Rect);
StringFormat Format = new StringFormat();
if(AlignToRight)
Format.FormatFlags = StringFormatFlags.DirectionRightToLeft;
switch(Alignment)
{
case HorizontalAlignment.Left:
Format.Alignment = StringAlignment.Near;
break;
case HorizontalAlignment.Right:
Format.Alignment = StringAlignment.Far;
break;
case HorizontalAlignment.Center:
Format.Alignment = StringAlignment.Center;
break;
}
Format.FormatFlags = Format.FormatFlags | StringFormatFlags.NoWrap;
g.FillRectangle(BackBrush, Rect);
Rect.Offset(0, yMargin);
Rect.Height -= yMargin;
g.DrawString(Text, DataGridTableStyle.DataGrid.Font, ForeBrush, RectF, Format);
Format.Dispose();
}
}
}