所以我已经开始创建自己的自定义DataGridView列和从组合框派生的单元类：
using System;
using System.Collections.Generic;
using System.Drawing;
using System.Globalization;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;
using Teigha.TD;
namespace TruckleSoft
{
class DataGridViewColourComboBoxColumn : DataGridViewComboBoxColumn
{
public DataGridViewColourComboBoxColumn()
{
CellTemplate = new DataGridViewColourComboBoxCell();
Name = "Colour";
ValueMember = "Name";
}
public override DataGridViewCell CellTemplate
{
get
{
return base.CellTemplate;
}
set
{
base.CellTemplate = value;
}
}
}
class DataGridViewColourComboBoxCell : DataGridViewComboBoxCell
{
public DataGridViewColourComboBoxCell()
{
InitialiseCell();
}
private void InitialiseCell()
{
List<ushort> listColours = new List<ushort>();
listColours.Add(1);
listColours.Add(2);
listColours.Add(3);
listColours.Add(4);
listColours.Add(5);
listColours.Add(6);
listColours.Add(7);
listColours.Add(8);
listColours.Add(9);
listColours.Add(250);
listColours.Add(251);
listColours.Add(252);
listColours.Add(253);
listColours.Add(254);
listColours.Add(255);
this.Items.Clear();
foreach (ushort iColourIndex in listColours)
this.Items.Add(ComboboxColourItem.Create(iColourIndex));
}
protected override void Paint(Graphics graphics, Rectangle clipBounds, Rectangle cellBounds, int rowIndex, DataGridViewElementStates elementState, object value, object formattedValue, string errorText, DataGridViewCellStyle cellStyle, DataGridViewAdvancedBorderStyle advancedBorderStyle, DataGridViewPaintParts paintParts)
{
//base.Paint(graphics, clipBounds, cellBounds, rowIndex, elementState, value, formattedValue, errorText, cellStyle, advancedBorderStyle, paintParts);
Color c = Color.Empty;
string s = "";
Brush br = SystemBrushes.WindowText;
Brush brBack;
Rectangle rDraw;
rDraw = cellBounds;
rDraw = Rectangle.FromLTRB(cellBounds.Left, cellBounds.Top, cellBounds.Right, cellBounds.Bottom - 1);
brBack = Brushes.White;
//Pen penGridlines = new Pen(dataGridView.GridColor);
g.DrawRectangle(Pens.Black, rDraw);
g.FillRectangle(brBack, rDraw);
//penGridlines.Dispose();
if (value != null)
{
ComboboxColourItem oColourItem = (ComboboxColourItem)value;
s = oColourItem.ToString();
c = oColourItem.Value;
}
if (c != Color.Empty)
{
SolidBrush b = new SolidBrush(c);
Rectangle r = new Rectangle(cellBounds.Left + 6,
cellBounds.Top + 5, 20, 10);
g.FillRectangle(b, r);
g.DrawRectangle(Pens.Black, r);
g.DrawString(s, Form.DefaultFont, Brushes.Black,
cellBounds.Left + 35, cellBounds.Top + 3);
b.Dispose();
}
int butSize = cellBounds.Height;
Rectangle rbut = new Rectangle(cellBounds.Right - butSize,
cellBounds.Top, butSize, butSize);
ComboBoxRenderer.DrawDropDownButton(graphics, rbut,
System.Windows.Forms.VisualStyles.ComboBoxState.Normal);
}
private void ColourComboBox_DrawItem(object sender, DrawItemEventArgs e)
{
Graphics g = e.Graphics;
Color c = Color.Empty;
string s = "";
Brush br = SystemBrushes.WindowText;
Brush brBack;
Rectangle rDraw;
bool bSelected = Convert.ToBoolean(e.State & DrawItemState.Selected);
bool bValue = Convert.ToBoolean(e.State & DrawItemState.ComboBoxEdit);
rDraw = e.Bounds;
rDraw.Inflate(-1, -1);
if (bSelected & !bValue)
{
brBack = Brushes.LightBlue;
g.FillRectangle(Brushes.LightBlue, rDraw);
g.DrawRectangle(Pens.Blue, rDraw);
}
else
{
brBack = Brushes.White;
g.FillRectangle(brBack, e.Bounds);
}
try
{
ComboboxColourItem oColourItem = (ComboboxColourItem)((ComboBox)sender).Items[e.Index];
s = oColourItem.ToString();
c = oColourItem.Value;
}
catch
{
//s = "red";
//c = Color.Red;
}
if (c != Color.Empty)
{
SolidBrush b = new SolidBrush(c);
Rectangle r = new Rectangle(e.Bounds.Left + 5, e.Bounds.Top + 3, 20, 10);
g.FillRectangle(b, r);
g.DrawRectangle(Pens.Black, r);
g.DrawString(s, Form.DefaultFont, Brushes.Black, e.Bounds.Left + 35, e.Bounds.Top + 1);
b.Dispose();
}
//g.Dispose();
}
}
public class ComboboxColourItem
{
public string Name { get; set; }
public ushort Index { get; set; }
public Color Value { get; set; }
public ComboboxColourItem(string Name, ushort Index, Color Value)
{
this.Name = Name;
this.Index = Index;
this.Value = Value;
}
public override string ToString()
{
return Name;
}
static public ComboboxColourItem Create(ushort iColourIndex)
{
OdCmColor oColour = new OdCmColor();
oColour.setColorIndex(iColourIndex);
CultureInfo cultureInfo = Thread.CurrentThread.CurrentCulture;
TextInfo textInfo = cultureInfo.TextInfo;
String strColour = textInfo.ToTitleCase(oColour.colorNameForDisplay());
if (iColourIndex < 8)
strColour = String.Format("{0} ({1})", strColour, iColourIndex);
else if (iColourIndex == 8 || iColourIndex == 9 || iColourIndex >= 250)
strColour = String.Format("Grey Shade ({0})", iColourIndex);
else
strColour = String.Format("Other ({0})", iColourIndex);
ComboboxColourItem oColourItem = new ComboboxColourItem(
strColour,
iColourIndex,
Color.FromArgb(oColour.red(), oColour.green(), oColour.blue()));
oColour.Dispose();
return oColourItem;
}
}
}
我现在面临的问题是：
private void DataGridView1_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e)
{
if (e.Control is ComboBox)
{
ComboBox theCB = (ComboBox)e.Control;
theCB.DrawMode = DrawMode.OwnerDrawFixed;
try
{
theCB.DrawItem -= new DrawItemEventHandler(this.combobox1_DrawItem);
}
catch { }
theCB.DrawItem += new DrawItemEventHandler(this.combobox1_DrawItem);
}
}
以上是DataGridView对象的处理程序。如何在我的DataGridViewColourComboBoxCell类中复制它？它应该是规定DrawItem方法的类。
更新
我知道我还需要自己编辑控件并执行：
public override Type EditType
{
get
{
return typeof(DataGridViewColourComboBoxEditingControl);
}
}
然后我补充道：
protected override void OnDrawItem(DrawItemEventArgs e)
{
//base.OnDrawItem(e);
Graphics g = e.Graphics;
Color c = Color.Empty;
string s = "";
Brush br = SystemBrushes.WindowText;
Brush brBack;
Rectangle rDraw;
bool bSelected = Convert.ToBoolean(e.State & DrawItemState.Selected);
bool bValue = Convert.ToBoolean(e.State & DrawItemState.ComboBoxEdit);
rDraw = e.Bounds;
rDraw.Inflate(-1, -1);
if (bSelected & !bValue)
{
brBack = Brushes.LightBlue;
g.FillRectangle(Brushes.LightBlue, rDraw);
g.DrawRectangle(Pens.Blue, rDraw);
}
else
{
brBack = Brushes.White;
g.FillRectangle(brBack, e.Bounds);
}
try
{
ComboboxColourItem oColourItem = (ComboboxColourItem)Items[e.Index];
s = oColourItem.ToString();
c = oColourItem.Value;
}
catch
{
//s = "red";
//c = Color.Red;
}
if (c != Color.Empty)
{
SolidBrush b = new SolidBrush(c);
Rectangle r = new Rectangle(e.Bounds.Left + 5, e.Bounds.Top + 3, 20, 10);
g.FillRectangle(b, r);
g.DrawRectangle(Pens.Black, r);
g.DrawString(s, Form.DefaultFont, Brushes.Black, e.Bounds.Left + 35, e.Bounds.Top + 1);
b.Dispose();
}
}
}
所以我现在仍然有的问题是：
在单元格Paint事件中：
protected override void Paint(Graphics graphics, Rectangle clipBounds, Rectangle cellBounds, int rowIndex, DataGridViewElementStates elementState, object value, object formattedValue, string errorText, DataGridViewCellStyle cellStyle, DataGridViewAdvancedBorderStyle advancedBorderStyle, DataGridViewPaintParts paintParts)
我做不到：
//Pen penGridlines = new Pen(dataGridView.GridColor);
因为我们在单元格对象中。
此外，这相当于“CellParsing”：
public override object ParseFormattedValue(object formattedValue, DataGridViewCellStyle cellStyle, TypeConverter formattedValueTypeConverter, TypeConverter valueTypeConverter)
{
return base.ParseFormattedValue(formattedValue, cellStyle, formattedValueTypeConverter, valueTypeConverter);
}
答案 0 :(得分：1)
这对我有帮助：
http://www.codeproject.com/Articles/15827/Gain-Access-To-DataGridView-Canned-Controls
我必须从DataGridViewComboBoxEditingControl创建一个新的派生类，并在该对象中将其设置为ownerdraw并处理OnDrawItem事件。
在DataGridViewColourComboBoxCell课程中，我必须覆盖EditType属性：
public override Type EditType
{
get
{
return typeof(DataGridViewColourComboBoxEditingControl);
}
}
对于CellParsing，我确实必须覆盖ParseFormattedValue。