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protected override void OnDrawItem(DrawItemEventArgs e)
{
e.DrawBackground();
if (0 <= e.Index)
{
e.Graphics.DrawString(this.m_table.Rows[e.Index][0].ToString(), e.Font, new SolidBrush(e.ForeColor), (float)e.Bounds.X, (float)e.Bounds.Y);
if (1 < this.m_table.Columns.Count)
{
int x = (base.DropDownWidth - base.Width) / (this.m_table.Columns.Count - 1);
if (this.m_table.Columns.Count <= columnLimit)
{
for (int i = 1; i < this.m_table.Columns.Count; i++)
{
e.Graphics.DrawString(this.m_table.Rows[e.Index][i].ToString(), e.Font, new SolidBrush(e.ForeColor), (float)(base.Width + (x * (i - 1))), (float)e.Bounds.Y);
}
}
else if (columnLimit < this.m_table.Columns.Count )
{
for (int i = 1; i < columnLimit; i++)
{
e.Graphics.DrawString(this.m_table.Rows[e.Index][i].ToString(), e.Font, new SolidBrush(e.ForeColor), (float)(base.Width + (x * (i - 1))), (float)e.Bounds.Y);
}
}
}
}
e.DrawFocusRectangle();
}
private void initCom()
{
this.comboBox1.DrawMode = System.Windows.Forms.DrawMode.OwnerDrawVariable;
this.comboBox1.FormattingEnabled = true;
this.comboBox1.Items.AddRange(new object[] {
"abcdefg",
"bcdefgh",
"cdefghi",
"defghij",
"efghijk",
"fghijkl",
"ghijklm"});
this.comboBox1.Location = new System.Drawing.Point(37, 100);
this.comboBox1.Name = "comboBox1";
this.comboBox1.Size = new System.Drawing.Size(121, 22);
this.comboBox1.TabIndex = 5;
this.comboBox1.DrawItem += new System.Windows.Forms.DrawItemEventHandler(this.comboBox1_DrawItem);
this.comboBox1.MeasureItem += new System.Windows.Forms.MeasureItemEventHandler(this.comboBox1_MeasureItem);
}
private void comboBox1_MeasureItem(object sender, MeasureItemEventArgs e)
{
e.ItemHeight = 20;
e.ItemWidth = 100;
}
private void comboBox1_DrawItem(object sender, DrawItemEventArgs e)
{
e.DrawBackground();
e.DrawFocusRectangle();
using (SolidBrush brush = new SolidBrush(e.ForeColor))
{
using (StringFormat format = new StringFormat())
{
format.Alignment = StringAlignment.Near;
format.LineAlignment = StringAlignment.Center;
e.Graphics.DrawString(this.comboBox1.Items[e.Index].ToString(), this.comboBox1.Font, brush, e.Bounds, format);
}
}
using (Pen pen = new Pen(e.ForeColor))
{
e.Graphics.DrawRectangle(pen, e.Bounds);
}
}
internal System.Windows.Forms.ComboBox ComboBox1;
private string[] animals;
// This method initializes the owner-drawn combo box.
// The drop-down width is set much wider than the size of the combo box
// to accomodate the large items in the list. The drop-down style is set to
// ComboBox.DropDown, which requires the user to click on the arrow to
// see the list.
private void InitializeComboBox()
{
this.ComboBox1 = new ComboBox();
this.ComboBox1.DrawMode =
System.Windows.Forms.DrawMode.OwnerDrawVariable;
this.ComboBox1.Location = new System.Drawing.Point(10, 20);
this.ComboBox1.Name = "ComboBox1";
this.ComboBox1.Size = new System.Drawing.Size(100, 120);
this.ComboBox1.DropDownWidth = 250;
this.ComboBox1.TabIndex = 0;
this.ComboBox1.DropDownStyle = ComboBoxStyle.DropDown;
animals = new string[]{"Elephant", "c r o c o d i l e", "lion"};
ComboBox1.DataSource = animals;
this.Controls.Add(this.ComboBox1);
// Hook up the MeasureItem and DrawItem events
this.ComboBox1.DrawItem +=
new DrawItemEventHandler(ComboBox1_DrawItem);
this.ComboBox1.MeasureItem +=
new MeasureItemEventHandler(ComboBox1_MeasureItem);
}
// If you set the Draw property to DrawMode.OwnerDrawVariable,
// you must handle the MeasureItem event. This event handler
// will set the height and width of each item before it is drawn.
private void ComboBox1_MeasureItem(object sender,
System.Windows.Forms.MeasureItemEventArgs e)
{
switch(e.Index)
{
case 0:
e.ItemHeight = 45;
break;
case 1:
e.ItemHeight = 20;
break;
case 2:
e.ItemHeight = 35;
break;
}
e.ItemWidth = 260;
}
// You must handle the DrawItem event for owner-drawn combo boxes.
// This event handler changes the color, size and font of an
// item based on its position in the array.
private void ComboBox1_DrawItem(object sender,
System.Windows.Forms.DrawItemEventArgs e)
{
float size = 0;
System.Drawing.Font myFont;
FontFamily family = null;
System.Drawing.Color animalColor = new System.Drawing.Color();
switch(e.Index)
{
case 0:
size = 30;
animalColor = System.Drawing.Color.Gray;
family = FontFamily.GenericSansSerif;
break;
case 1:
size = 10;
animalColor = System.Drawing.Color.LawnGreen;
family = FontFamily.GenericMonospace;
break;
case 2:
size = 15;
animalColor = System.Drawing.Color.Tan;
family = FontFamily.GenericSansSerif;
break;
}
// Draw the background of the item.
e.DrawBackground();
// Create a square filled with the animals color. Vary the size
// of the rectangle based on the length of the animals name.
Rectangle rectangle = new Rectangle(2, e.Bounds.Top+2,
e.Bounds.Height, e.Bounds.Height-4);
e.Graphics.FillRectangle(new SolidBrush(animalColor), rectangle);
// Draw each string in the array, using a different size, color,
// and font for each item.
myFont = new Font(family, size, FontStyle.Bold);
e.Graphics.DrawString(animals[e.Index], myFont, System.Drawing.Brushes.Black, new RectangleF(e.Bounds.X+rectangle.Width, e.Bounds.Y, e.Bounds.Width, e.Bounds.Height));
// Draw the focus rectangle if the mouse hovers over an item.
e.DrawFocusRectangle();
}