VB net Sample:
Imports System.ComponentModel
Imports System.Drawing.Design
Imports System.ComponentModel.Design
Namespace Dotnetrix_Samples
Public Class ImageCombo
Inherits System.Windows.Forms.ComboBox
#Region " Windows Form Designer generated code "
Public Sub New()
MyBase.New()
'This call is required by the Windows Form Designer.
InitializeComponent()
'Add any initialization after the InitializeComponent() call
MyBase.DrawMode = DrawMode.OwnerDrawFixed
End Sub
'UserControl overrides dispose to clean up the component list.
Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
If disposing Then
If Not (components Is Nothing) Then
components.Dispose()
End If
If Not (Me.Items Is Nothing) Then
For Each o As Object In Me.Items
If TypeOf o Is ImageComboItem Then
DirectCast(o, ImageComboItem).Dispose()
End If
Next
End If
End If
MyBase.Dispose(disposing)
End Sub
'Required by the Windows Form Designer
Private components As System.ComponentModel.IContainer
'NOTE: The following procedure is required by the Windows Form Designer
'It can be modified using the Windows Form Designer.
'Do not modify it using the code editor.
<System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
components = New System.ComponentModel.Container
End Sub
#End Region
Private currentIndex As Int32 = -1
<Browsable(False), EditorBrowsable(EditorBrowsableState.Never)> _
Public Shadows ReadOnly Property DrawMode() As DrawMode
Get
Return DrawMode.OwnerDrawFixed
End Get
End Property
<Editor(GetType(ImageComboItemEditor), GetType(UITypeEditor)), _
DesignerSerializationVisibility(DesignerSerializationVisibility.Content)> _
Public Shadows ReadOnly Property Items() As ObjectCollection
Get
Return MyBase.Items
End Get
End Property
Private Class ImageComboItemEditor
Inherits CollectionEditor
Public Sub New(ByVal type As Type)
MyBase.New(type)
End Sub
Protected Overrides Function CreateCollectionItemType() As System.Type
Return GetType(ImageComboItem)
End Function
End Class
Protected Overrides Sub OnDrawItem(ByVal e As System.Windows.Forms.DrawItemEventArgs)
If e.Index = -1 OrElse e.Index > Me.Items.Count - 1 Then Return
e.DrawBackground()
Dim imageRect As Rectangle = New Rectangle(e.Bounds.X, e.Bounds.Y, e.Bounds.Height, e.Bounds.Height)
Dim textRectF As RectangleF = RectangleF.FromLTRB(imageRect.Right + 2, e.Bounds.Top, e.Bounds.Right, e.Bounds.Bottom)
If TypeOf Items(e.Index) Is ImageComboItem Then
Dim Item As ImageComboItem = DirectCast(Items(e.Index), ImageComboItem)
If Not (Item.Image Is Nothing) Then
e.Graphics.DrawImage(Item.Image, imageRect)
End If
End If
Dim TextBrush As New SolidBrush(Me.ForeColor)
If (e.State And DrawItemState.Selected) = DrawItemState.Selected Then
TextBrush.Color = SystemColors.HighlightText
End If
Dim sf As New StringFormat(StringFormatFlags.NoWrap)
sf.LineAlignment = StringAlignment.Center
sf.Trimming = StringTrimming.EllipsisCharacter
e.Graphics.DrawString(Items(e.Index).ToString, Me.Font, TextBrush, textRectF, sf)
TextBrush.Dispose()
End Sub
Protected Overrides Sub OnSelectedIndexChanged(ByVal e As System.EventArgs)
If Me.SelectedIndex <> currentIndex Then
currentIndex = Me.SelectedIndex
MyBase.RefreshItem(Me.SelectedIndex)
Else
MyBase.OnSelectedIndexChanged(e)
End If
End Sub
End Class
<DesignTimeVisible(False)> _
Public Class ImageComboItem
Inherits Component
Private m_object As Object
Private m_Image As Image
<TypeConverter(GetType(StringConverter))> _
Public Property [Item]() As Object
Get
Return m_object
End Get
Set(ByVal Value As Object)
m_object = Value
End Set
End Property
Public Property [Image]() As Image
Get
Return m_Image
End Get
Set(ByVal Value As Image)
m_Image = Value
End Set
End Property
Public Overrides Function ToString() As String
If m_object Is Nothing Then
Return String.Empty
Else
Return m_object.ToString
End If
End Function
End Class
End Namespace
CSharp Sample:
using System;
using System.ComponentModel;
using System.Drawing;
using System.Windows.Forms;
using System.Drawing.Design;
using System.ComponentModel.Design;
namespace Dotnetrix_Samples
{
/// <summary>
/// Summary description for ImageCombo.
/// </summary>
public class ImageCombo : System.Windows.Forms.ComboBox
{
/// <summary>
/// Required designer variable.
/// </summary>
private System.ComponentModel.Container components = null;
public ImageCombo()
{
// This call is required by the Windows.Forms Form Designer.
InitializeComponent();
// TODO: Add any initialization after the InitializeComponent call
base.DrawMode = DrawMode.OwnerDrawVariable;
}
/// <summary>
/// Clean up any resources being used.
/// </summary>
protected override void Dispose( bool disposing )
{
if( disposing )
{
if(components != null)
{
components.Dispose();
}
if (this.Items != null)
{
foreach (Object o in this.Items)
{
if (o is ImageComboItem)
((ImageComboItem)o).Dispose();
}
}
}
base.Dispose( disposing );
}
#region Component Designer generated code
/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent()
{
components = new System.ComponentModel.Container();
}
#endregion
private int currentIndex = -1;
[Browsable(false), EditorBrowsable(EditorBrowsableState.Never)]
public new DrawMode DrawMode
{
get{return DrawMode.OwnerDrawFixed;}
}
[Editor(typeof(ImageComboItemEditor), typeof(UITypeEditor))]
[DesignerSerializationVisibility(DesignerSerializationVisibility.Content)]
public new ObjectCollection Items
{
get{return base.Items;}
}
private class ImageComboItemEditor : CollectionEditor
{
public ImageComboItemEditor(Type type):base(type){}
protected override Type CreateCollectionItemType()
{
return typeof(ImageComboItem);
}
}
protected override void OnDrawItem(DrawItemEventArgs e)
{
if (e.Index == -1 || e.Index > this.Items.Count - 1)
return;
e.DrawBackground();
Rectangle imageRect = new Rectangle(e.Bounds.X, e.Bounds.Y, e.Bounds.Height, e.Bounds.Height);
RectangleF textRectF = RectangleF.FromLTRB(imageRect.Right + 2, e.Bounds.Top, e.Bounds.Right, e.Bounds.Bottom);
if (Items[e.Index] is ImageComboItem )
{
ImageComboItem Item = (ImageComboItem)Items[e.Index];
if (Item.Image != null)
e.Graphics.DrawImage(Item.Image, imageRect);
}
SolidBrush TextBrush = new SolidBrush(this.ForeColor);
if ((e.State & DrawItemState.Selected) == DrawItemState.Selected)
TextBrush.Color = SystemColors.HighlightText;
StringFormat sf = new StringFormat(StringFormatFlags.NoWrap);
sf.LineAlignment = StringAlignment.Center;
sf.Trimming = StringTrimming.EllipsisCharacter;
e.Graphics.DrawString(Items[e.Index].ToString(), this.Font, TextBrush, textRectF, sf);
TextBrush.Dispose();
}
protected override void OnSelectedIndexChanged(EventArgs e)
{
if (this.SelectedIndex != this.currentIndex)
{
this.currentIndex = this.SelectedIndex;
base.RefreshItem(this.SelectedIndex);
}
else
{
base.OnSelectedIndexChanged (e);
}
}
}
[DesignTimeVisible(false)]
public class ImageComboItem : Component
{
private Object m_object;
private Image m_Image;
[TypeConverter(typeof(StringConverter))]
public Object Item
{
get{return m_object;}
set{m_object = value;}
}
public Image Image
{
get{return m_Image;}
set{m_Image = value;}
}
public override string ToString()
{
if (m_object == null)
return String.Empty;
else
return m_object.ToString();
}
}
}
by: Mick Dohertys'
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