/// <summary>
/// Raises the <see cref="E:System.Windows.Forms.ComboBox.DrawItem"/> event.
/// </summary>
/// <param name="e">A <see cref="T:System.Windows.Forms.DrawItemEventArgs"/> that contains the event data. </param>
protected override void OnDrawItem(DrawItemEventArgs e)
{
base.OnDrawItem(e);
if (e.Index < 0)
{
return;
}
if (DesignMode)
{
return;
}
e.DrawBackground();
var boundsRect = e.Bounds;
var lastRight = 0;
Color brushForeColor;
if ((e.State & DrawItemState.Selected) == 0)
{
// Item is not selected. Use BackColorOdd & BackColorEven
var backColor = Convert.ToBoolean(e.Index % 2) ? BackColorOdd : BackColorEven;
using (var brushBackColor = new SolidBrush(backColor))
{
e.Graphics.FillRectangle(brushBackColor, e.Bounds);
}
brushForeColor = Color.Black;
}
else
{
// Item is selected. Use ForeColor = White
brushForeColor = Color.White;
}
using (var linePen = new Pen(SystemColors.GrayText))
{
using (var brush = new SolidBrush(brushForeColor))
{
if (ColumnNames.Count == 0)
{
e.Graphics.DrawString(Convert.ToString(Items[e.Index]), Font, brush, boundsRect);
}
else
{
// If the ComboBox is displaying a RightToLeft language, draw it this way.
if (RightToLeft.Equals(RightToLeft.Yes))
{
// Define a StringFormat object to make the string display RTL.
var rtl = new StringFormat
{
Alignment = StringAlignment.Near,
FormatFlags = StringFormatFlags.DirectionRightToLeft
};
// Draw the strings in reverse order from high column index to zero column index.
for (var colIndex = ColumnNames.Count - 1; colIndex >= 0; colIndex--)
{
if (!Convert.ToBoolean(ColumnWidths[colIndex]))
{
continue;
}
var item = Convert.ToString(FilterItemOnProperty(Items[e.Index], ColumnNames[colIndex]));
boundsRect.X = lastRight;
boundsRect.Width = _columnWidths[colIndex];
lastRight = boundsRect.Right;
// Draw the string with the RTL object.
e.Graphics.DrawString(item, Font, brush, boundsRect, rtl);
if (colIndex > 0)
{
e.Graphics.DrawLine(linePen, boundsRect.Right, boundsRect.Top, boundsRect.Right, boundsRect.Bottom);
}
}
}
// If the ComboBox is displaying a LeftToRight language, draw it this way.
else
{
// Display the strings in ascending order from zero to the highest column.
for (var colIndex = 0; colIndex < ColumnNames.Count; colIndex++)
{
if (Convert.ToBoolean(_columnWidths[colIndex]))
{
var item = Convert.ToString(FilterItemOnProperty(Items[e.Index], ColumnNames[colIndex]));
boundsRect.X = lastRight;
boundsRect.Width = _columnWidths[colIndex];
lastRight = boundsRect.Right;
e.Graphics.DrawString(item, Font, brush, boundsRect);
if (colIndex < ColumnNames.Count - 1)
{
e.Graphics.DrawLine(linePen, boundsRect.Right, boundsRect.Top, boundsRect.Right, boundsRect.Bottom);
}
}
}
}
}
}
}
e.DrawFocusRectangle();
}
protected override void OnDrawItem(DrawItemEventArgs e)
{
base.OnDrawItem(e);
if (DesignMode)
{
return;
}
e.DrawBackground();
Rectangle boundsRect = e.Bounds;
int lastRight = 0;
Color brushForeColor;
if ((e.State & DrawItemState.Selected) == 0)
{
// Item is not selected. Use BackColorOdd & BackColorEven
Color backColor;
backColor = Convert.ToBoolean(e.Index % 2) ? _backColorOdd : _backColorEven;
using (SolidBrush brushBackColor = new SolidBrush(backColor))
{
e.Graphics.FillRectangle(brushBackColor, e.Bounds);
}
brushForeColor = Color.Black;
}
else
{
GraphicsPath pa = new GraphicsPath();
StyleHelp.DrawArc(e.Bounds, pa, 6, EGroupPos.None);
LinearGradientBrush lgbrush = new LinearGradientBrush(e.Bounds, Color.Transparent, Color.Transparent, LinearGradientMode.Vertical);
lgbrush.InterpolationColors = ColorHelper.GetBlend4();
e.Graphics.FillRectangle(lgbrush, e.Bounds);
Rectangle rect = e.Bounds;
rect.Width--;
rect.Height--;
using (Pen pen = new Pen(_officeColorTable.ComboBoxBorderHoverColor))
{
e.Graphics.DrawRectangle(pen, rect);
}
// Item is selected. Use ForeColor = White
//brushForeColor = Color.White;
brushForeColor = Color.Black;
}
if (_bShowColumnName && e.Index == 0)
{
GraphicsPath pa = new GraphicsPath();
StyleHelp.DrawArc(e.Bounds, pa, 6, EGroupPos.None);
LinearGradientBrush lgbrush = new LinearGradientBrush(e.Bounds, Color.Transparent, Color.Transparent, LinearGradientMode.Vertical);
lgbrush.InterpolationColors = ColorHelper.GetBlendSliver();
e.Graphics.FillRectangle(lgbrush, e.Bounds);
Rectangle rect = e.Bounds;
rect.Width--;
rect.Height--;
using (Pen pen = new Pen(Color.FromArgb(200, 225, 229, 240)))
{
e.Graphics.DrawRectangle(pen, rect);
}
}
using (Pen linePen = new Pen(SystemColors.GrayText))
{
using (SolidBrush brush = new SolidBrush(brushForeColor))
{
if (!Convert.ToBoolean(_columnNames.Count))
{
e.Graphics.DrawString(Convert.ToString(Items[e.Index]), Font, brush, boundsRect);
}
else
{
// If the ComboBox is displaying a RightToLeft language, draw it this way.
if (RightToLeft.Equals(RightToLeft.Yes))
{
// Define a StringFormat object to make the string display RTL.
StringFormat rtl = new StringFormat();
rtl.Alignment = StringAlignment.Near;
rtl.FormatFlags = StringFormatFlags.DirectionRightToLeft;
// Draw the strings in reverse order from high column index to zero column index.
for (int colIndex = _columnNames.Count - 1; colIndex >= 0; colIndex--)
{
if (Convert.ToBoolean(_columnWidths[colIndex]))
{
string item = Convert.ToString(FilterItemOnProperty(Items[e.Index], _columnNames[colIndex]));
boundsRect.X = lastRight;
boundsRect.Width = (int)_columnWidths[colIndex];
lastRight = boundsRect.Right;
// Draw the string with the RTL object.
e.Graphics.DrawString(item, Font, brush, boundsRect, rtl);
if (colIndex > 0)
{
e.Graphics.DrawLine(linePen, boundsRect.Right, boundsRect.Top, boundsRect.Right, boundsRect.Bottom);
}
}
}
}
// If the ComboBox is displaying a LeftToRight language, draw it this way.
else
{
// Display the strings in ascending order from zero to the highest column.
for (int colIndex = 0; colIndex < _columnNames.Count; colIndex++)
{
if (Convert.ToBoolean(_columnWidths[colIndex]))
{
string item = Convert.ToString(FilterItemOnProperty(Items[e.Index], _columnNames[colIndex]));
boundsRect.X = lastRight;
boundsRect.Width = (int)_columnWidths[colIndex];
lastRight = boundsRect.Right;
e.Graphics.DrawString(item, Font, brush, boundsRect);
if (colIndex < _columnNames.Count - 1)
{
e.Graphics.DrawLine(linePen, boundsRect.Right, boundsRect.Top, boundsRect.Right, boundsRect.Bottom);
}
}
}
}
}
}
}
e.DrawFocusRectangle();
}
/// <summary>
/// Raises the <see cref="E:System.Windows.Forms.ComboBox.DrawItem"/> event.
/// </summary>
/// <param name="e">A <see cref="T:System.Windows.Forms.DrawItemEventArgs"/> that contains the event data. </param>
protected override void OnDrawItem(DrawItemEventArgs e)
{
if (e.Index < 0 || DesignMode)
{
base.OnDrawItem(e);
return;
}
e.DrawBackground();
var boundsRect = e.Bounds;
Image icon = FilterItemOnProperty(Items[e.Index], "Icon") as Image;
var lastRight = OwningColumn.CategoryColumnName == null || e.State.HasFlag(DrawItemState.ComboBoxEdit) || icon != null ? 0 : IndentSize;
var drawUncategorizedItemSpecial = IsUncategorizedItemSpecial(e.Index);
if (e.State.HasFlag(DrawItemState.ComboBoxEdit))
{
if (drawUncategorizedItemSpecial)
{
return;
}
boundsRect.Height--;
}
Color brushForeColor = Color.Black;
if ((e.State & DrawItemState.Selected) == 0)
{
// Item is not selected. Use BackColorOdd & BackColorEven
var backColor = Convert.ToBoolean(e.Index % 2) ? BackColorOdd : BackColorEven;
using (var brushBackColor = new SolidBrush(backColor))
e.Graphics.FillRectangle(brushBackColor, boundsRect);
}
Font font;
object category;
if (IsItemFirstInCategory(e.Index, out category) && !e.State.HasFlag(DrawItemState.ComboBoxEdit))
{
var categoryRect = new Rectangle(boundsRect.X, boundsRect.Y, boundsRect.Width, boundsRect.Height / 2);
if ((e.State & DrawItemState.Selected) != 0)
{
// Item is selected. Repaint background for the category portion of the line.
using (var brushBackColor = new SolidBrush(Color.White))
e.Graphics.FillRectangle(brushBackColor, categoryRect);
}
var sCategory = Convert.ToString(category);
font = OwningColumn.FontForCategories ?? Font;
using (var brush = new SolidBrush(brushForeColor))
{
if (e.Index > 0)
{
using (var linePen = new Pen(SystemColors.GrayText))
e.Graphics.DrawLine(linePen, categoryRect.X, categoryRect.Y, categoryRect.Right, categoryRect.Y);
}
categoryRect.Y += kSeparatorLineHeight;
categoryRect.Height -= kSeparatorLineHeight;
e.Graphics.DrawString(sCategory, font, brush, categoryRect);
}
boundsRect.Y = categoryRect.Bottom;
boundsRect.Height -= categoryRect.Height;
}
if ((e.State & DrawItemState.Selected) != 0)
{
// Item is selected. Use ForeColor = White
brushForeColor = Color.White;
}
if (e.State.HasFlag(DrawItemState.ComboBoxEdit))
{
lastRight += 2;
}
font = Font;
if (drawUncategorizedItemSpecial)
{
if (OwningColumn.FontForUncategorizedItems != null)
{
font = OwningColumn.FontForUncategorizedItems;
}
}
else if (OwningColumn.CategoryColumnName != null)
{
boundsRect.Width -= IndentSize;
}
using (var linePen = new Pen(SystemColors.GrayText))
{
using (var brush = new SolidBrush(brushForeColor))
{
if (ColumnNames.Count == 0)
{
e.Graphics.DrawString(Convert.ToString(Items[e.Index]), font, brush, boundsRect);
}
else
{
if (drawUncategorizedItemSpecial)
{
if (e.Index > 0)
{
e.Graphics.DrawLine(linePen, boundsRect.X, boundsRect.Y, boundsRect.Right, boundsRect.Y);
}
boundsRect.Width -= IndentSize;
boundsRect.Y += kSeparatorLineHeight;
boundsRect.Height -= kSeparatorLineHeight;
}
if (icon != null)
{
int top = boundsRect.Y;
int height = boundsRect.Height;
int left = boundsRect.X;
int width = IndentSize - 2;
if (icon.Height < height)
{
top += ((boundsRect.Height - icon.Height) / 2);
height = icon.Height;
}
if (icon.Width < width)
{
left += ((boundsRect.Width - icon.Width) / 2);
width = icon.Width;
}
e.Graphics.DrawImage(icon, left, top, width, height);
lastRight += IndentSize;
}
if (drawUncategorizedItemSpecial)
{
string item = Convert.ToString(FilterItemOnProperty(Items[e.Index], "SpecialUse"));
boundsRect.X = lastRight;
boundsRect.Width = boundsRect.Width;
e.Graphics.DrawString(item, font, brush, boundsRect, new StringFormat());
}
else
{
// Default (L-to-R) is to display the strings in ascending order from zero to the highest column.
int loopStart = 0;
Func <int, bool> notDone = i => i < ColumnNames.Count;
Func <int, int> loopIncrementer = i => i + 1;
StringFormat format = new StringFormat();
// If the ComboBox is displaying a RightToLeft language, draw it this way.
if (RightToLeft.Equals(RightToLeft.Yes))
{
// Define a StringFormat object to make the string display RTL.
format = new StringFormat
{
Alignment = StringAlignment.Near,
FormatFlags = StringFormatFlags.DirectionRightToLeft
};
// Draw the strings in reverse order from high column index to zero column index.
loopStart = ColumnNames.Count - 1;
notDone = i => i >= 0;
loopIncrementer = i => i - 1;
}
for (var colIndex = loopStart; notDone(colIndex); colIndex = loopIncrementer(colIndex))
{
if (m_columnWidths[colIndex] > 0)
{
string item = Convert.ToString(FilterItemOnProperty(Items[e.Index], ColumnNames[colIndex]));
boundsRect.X = lastRight;
boundsRect.Width = m_columnWidths[colIndex];
lastRight = boundsRect.Right;
e.Graphics.DrawString(item, font, brush, boundsRect, format);
if (lastRight + 7 >= e.Bounds.Right)
{
break;
}
if (notDone(loopIncrementer(colIndex)) && !drawUncategorizedItemSpecial)
{
e.Graphics.DrawLine(linePen, boundsRect.Right - 1, boundsRect.Top, boundsRect.Right - 1, boundsRect.Bottom);
}
}
}
}
}
}
}
e.DrawFocusRectangle();
}