[C #] Simple Self-painted ComboBox with images

First look at the effect:

 

 

 

 

First construct a subitem class:

 

[Csharp]
Using System;
Using System. Collections. Generic;
Using System. Linq;
Using System. Text;
Using System. Drawing ;//
 
Namespace ComboBox_Draw
{
// Customize the combo box item
Class MyItem
{
// Item text content
Private String Text;

// Item Image
Public Image Img;
 
// Constructor
Public MyItem (String text, Image img)
{
Text = text;
Img = img;
}
 
// Rewrite the ToString function to return the item text
Public override string ToString ()
{
Return Text;
} Www.2cto.com
}
}
 

Then let's see the rewrite DrawItem event:

 

[Csharp]
Private void comboboxincludrawitem (object sender, DrawItemEventArgs e)
{
// Select this item with the mouse
If (e. State & DrawItemState. Selected )! = 0)
{
// Gradient painter
LinearGradientBrush brush = new LinearGradientBrush (e. Bounds, Color. FromArgb (255,251,237 ),
Color. FromArgb (255,236,181), LinearGradientMode. Vertical );
// Fill area
Rectangle borderRect = new Rectangle (3, e. Bounds. Y, e. Bounds. Width-5, e. Bounds. Height-2 );
 
E. Graphics. FillRectangle (brush, borderRect );
 
// Draw a border
Pen pen = new Pen (Color. FromArgb (229,195,101 ));
E. Graphics. DrawRectangle (pen, borderRect );
}
Else
{
SolidBrush brush = new SolidBrush (Color. FromArgb (255,255,255 ));
E. Graphics. FillRectangle (brush, e. Bounds );
}
 
// Obtain the item image and draw the image
MyItem item = (MyItem) comboBox1.Items [e. Index];
Image img = item. Img;

// The area of the image.
Rectangle imgRect = new Rectangle (6, e. Bounds. Y + 3, 45, 45 );
E. Graphics. DrawImage (img, imgRect );

// Text content display area
Rectangle textRect =
New Rectangle (imgRect. Right + 2, imgRect. Y, e. Bounds. Width-imgRect. Width, e. Bounds. Height-2 );

// Obtain the item text and draw the text
String itemText = comboBox1.Items [e. Index]. ToString ();
 
// Vertical center of text format
StringFormat strFormat = new StringFormat ();
StrFormat. LineAlignment = StringAlignment. Center;
E. Graphics. DrawString (itemText, new Font ("", 12), Brushes. Black, textRect, strFormat );
}
 

The last is the form Load event: the last is the form Load event:

 

[Csharp]
Private void Form1_Load (object sender, EventArgs e)
{
// Add an item
ComboBox1.Items. Add (new MyItem ("000000", Image. FromFile (Application. StartupPath + "\ 0.gif ")));
ComboBox1.Items. Add (new MyItem ("111111", Image. FromFile (Application. StartupPath + "\ 1.gif ")));
ComboBox1.Items. Add (new MyItem ("222222", Image. FromFile (Application. StartupPath + "\ 2.gif ")));
ComboBox1.Items. Add (new MyItem ("333333", Image. FromFile (Application. StartupPath + "\ 3.gif ")));
 
// Index selected by default
ComboBox1.SelectedIndex = 0;
 
// Attributes to be set for the Self-painted combo box
ComboBox1.DrawMode = DrawMode. OwnerDrawFixed;
ComboBox1.DropDownStyle = ComboBoxStyle. DropDownList;
ComboBox1.ItemHeight = 50;
ComboBox1.Width = 200;
 
// Add the DrawItem event processing function
ComboBox1.DrawItem + = combobox#drawitem;
 
}
Author: isaced