Owner-Drawn Colored ListBox

Posted on 2008-10-18
Medium Priority
Last Modified: 2013-11-25
I'm trying to develop an Owner-Drawn ListBox and here is what i did :

I'm trying to apply a new property called "AlternatingItemsCellStyle", like the one in the DataGridView Control , but i have some problems implementing it.
I have some classes like "ListBoxCellStyle" which have some properties like -- forecolor, backcolor, selectionforecolor, selectionbackcolor and font property.
i also implement a type converter for that cellstyle and a custom item to be added to the listbox
but that code doesn't work when i added some items to the list nothing changed.
I attached a test form to test that list but , every time i'm trying to run the form i get a strange error messagsays 'Assembly 'C:\Documents and Settings\~~~\Desktop\~~~\~~~\obj\Debug\~~~~.dll' doesn't contain any UserControl types.'


<ToolboxBitmap(GetType(ListBox))> _
<DefaultProperty("AlternatingItemsCellStyle")> _
<DefaultEvent("SelectedIndexChanged")> _
Public Class ColoredListBox
    Inherits ListBox
    Private _DrawMode As DrawMode = Windows.Forms.DrawMode.OwnerDrawVariable
    <DefaultValue(GetType(DrawMode), "OwnerDrawVariable")> _
    Public Overloads Property DrawMode() As DrawMode
            Return _DrawMode
        End Get
        Set(ByVal Value As DrawMode)
            _DrawMode = Value
        End Set
    End Property
    Private _AlternatingItemsCellStyle As ListBoxCellStyle = New ListBoxCellStyle
    '<DefaultValue(GetType(ListBoxCellStyle), "(White), (Black), (Maroon), (255, 224, 192), (Tahoma, 8pt)")> _
    <DesignerSerializationVisibility(DesignerSerializationVisibility.Content)> _
    Public Property AlternatingItemsCellStyle() As ListBoxCellStyle
            Return _AlternatingItemsCellStyle
        End Get
        Set(ByVal Value As ListBoxCellStyle)
            _AlternatingItemsCellStyle = Value
            AddHandler _AlternatingItemsCellStyle.AlternatingCellStyleChanged, AddressOf AlternatingCellStyleChanged
        End Set
    End Property
    Private Sub AlternatingCellStyleChanged(ByVal sender As Object, ByVal e As EventArgs)
    End Sub
    Private Sub ColoredListBox_DrawItem(ByVal sender As Object, ByVal e As System.Windows.Forms.DrawItemEventArgs) Handles Me.DrawItem
        Dim List As ListBox = CType(sender, ListBox)
        Dim Item As FormattedListItem = Nothing
        If TypeOf List.Items(e.Index) Is FormattedListItem Then
            Item = CType(List.Items(e.Index), FormattedListItem)
        End If
        Dim Font As Font = Nothing
        Dim ForeColor As Color = Color.Empty
        Dim BackColor As Color = Color.Empty
        Dim SelectionForeColor As Color = Color.Empty
        Dim SelectionBackColor As Color = Color.Empty
        If Item IsNot Nothing Then
            Font = Item.ListBoxItemsStyle.Font
            ForeColor = Item.ListBoxItemsStyle.ForeColor
            BackColor = Item.ListBoxItemsStyle.BackColor
            SelectionForeColor = Item.ListBoxItemsStyle.SelectionForeColor
            SelectionBackColor = Item.ListBoxItemsStyle.SelectionBackColor
            Font = List.Font
            ForeColor = List.ForeColor
            BackColor = List.BackColor
            SelectionForeColor = System.Drawing.SystemColors.HighlightText
            SelectionBackColor = System.Drawing.SystemColors.Highlight
        End If
        Dim ForeBrush As Brush
        Dim BackBrush As Brush
        If (e.State And DrawItemState.Selected) = DrawItemState.Selected Then
            ForeBrush = New SolidBrush(SelectionForeColor)
            BackBrush = New SolidBrush(SelectionBackColor)
            ForeBrush = New SolidBrush(ForeColor)
            BackBrush = New SolidBrush(BackColor)
        End If
        e.Graphics.FillRectangle(BackBrush, e.Bounds)
        Dim Text As String = List.Items(e.Index).ToString
        e.Graphics.DrawString(Text, Font, ForeBrush, e.Bounds.X, e.Bounds.Y)
    End Sub
    Private Sub ColoredListBox_MeasureItem(ByVal sender As Object, ByVal e As System.Windows.Forms.MeasureItemEventArgs) Handles Me.MeasureItem
        Dim List As ListBox = CType(sender, ListBox)
        If (IsPrimeNumber(e.Index)) Then
            Dim MyItem As New FormattedListItem(List.Items(e.Index), Me.AlternatingItemsCellStyle)
            If MyItem.ListBoxItemsStyle.Font IsNot Nothing Then
                List.Items.Insert(e.Index, MyItem)
                e.ItemHeight = MyItem.ListBoxItemsStyle.Font.Height
            End If
        End If
    End Sub
    Private Function IsPrimeNumber(ByVal [Number] As Integer) As Boolean
        Dim TheDouble As Double
        TheDouble = Double.Parse(([Number] / 2))
        If TheDouble.ToString.Contains(".") Then
            Return True
        End If
        Return False
    End Function
End Class

Open in new window

Question by:AhmedHindy
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
LVL 70

Accepted Solution

Éric Moreau earned 2000 total points
ID: 22752776

Featured Post

Independent Software Vendors: We Want Your Opinion

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Transparency shows that a company is the kind of business that it wants people to think it is.
Learn how ViaSat reduced average response times for IT incidents from 10 minutes to 30 seconds.
With the power of JIRA, there's an unlimited number of ways you can customize it, use it and benefit from it. With that in mind, there's bound to be things that I wasn't able to cover in this course. With this summary we'll look at some places to go…
Simple Linear Regression

762 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question