Visual Basic

Public MustOverride WriteOnly Property MessageEntry As String

Public Overrides WriteOnly Property MessageEntry() As String
    Set(ByVal Value As String)
        txtRecvdmessage.Text = Value
    End Set
End Property

m.MessageEntry = txtCommand.Text

Private Const WM_NCLBUTTONDOWN As Integer = &HA1
Protected Overrides Sub WndProc(ByRef m As System.Windows.Forms.Message)
    If m.Msg = WM_NCLBUTTONDOWN Then
        Me.Opacity = 0.5
    End If
    MyBase.WndProc(m)
End Sub

Imports System.ComponentModel
Imports System.Drawing

<ToolboxItem(""), DesignTimeVisible(False)> _
Public Class DataColumn : Inherits Component

    Protected Shared _StringFormatter As StringFormat
    Shared Sub New()
        _StringFormatter = New StringFormat()
        With _StringFormatter
            .Trimming = StringTrimming.EllipsisCharacter
            .FormatFlags = StringFormatFlags.NoWrap
            .LineAlignment = StringAlignment.Center
        End With
    End Sub

#Region "Member Vars"
    Private _Image As Image
    Private _DataMember As String
    Private _Tag As Object
    Private _Width As Integer
    Private _Parent As DataColumnCollection
#End Region

#Region "Constructors"
    Public Sub New()
        _Image = Nothing
        _Width = 75
        _DataMember = String.Empty
        _Tag = Nothing
    End Sub
    Public Sub New(ByVal Image As Image)
        _Image = Image
        _Width = 22
        _DataMember = String.Empty
        _Tag = Nothing
    End Sub
    Public Sub New(ByVal DataMember As String)
        _Image = Nothing
        _Width = 75
        _DataMember = DataMember
        _Tag = Nothing
    End Sub
    Public Sub New(ByVal Width As Integer)
        _Image = Nothing
        _Width = Width
        _DataMember = String.Empty
        _Tag = Nothing
    End Sub
    Public Sub New(ByVal DataMember As String, ByVal Width As Integer)
        _Image = Nothing
        _Width = Width
        _DataMember = DataMember
        _Tag = Nothing
    End Sub
    Public Sub New(ByVal Image As Image, _
                    ByVal DataMember As String, _
                    ByVal Width As Integer)
        _Image = Image
        _Width = Width
        _DataMember = DataMember
        _Tag = Nothing
    End Sub
#End Region

    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing Then
            If Not (_Image Is Nothing) Then
                Try
                    _Image.Dispose()
                Finally
                    _Image = Nothing
                End Try
            End If
        End If
        MyBase.Dispose(disposing)
    End Sub

#Region "Properties"
    <Editor("System.Windows.Forms.Design.DataMemberFieldEditor", _
    "System.Drawing.Design.UITypeEditor"), _
    Category("Behavior")> _
    Public Overridable Property DataMember() As String
        Get
            Return _DataMember
        End Get
        Set(ByVal Value As String)
            _DataMember = Value
        End Set
    End Property

    <Category("Behavior")> _
    Public Overridable Property Tag() As Object
        Get
            Return _Tag
        End Get
        Set(ByVal Value As Object)
            _Tag = Value
        End Set
    End Property

    <DefaultValue(75), Category("Appearance")> _
    Public Overridable Property Width() As Integer
        Get
            If _Parent Is Nothing OrElse _Parent.Count <> 1 Then
                Return _Width
            Else
                Return Math.Max(_Parent.ParentWidth, _Width)
            End If
        End Get
        Set(ByVal Value As Integer)
            _Width = Value
        End Set
    End Property

    <Category("Appearance")> _
    Public Property Image() As Image
        Get
            Return _Image
        End Get
        Set(ByVal Value As Image)
            _Image = Value
        End Set
    End Property

    Protected Friend Property Parent() As DataColumnCollection
        Get
            Return _Parent
        End Get
        Set(ByVal Value As DataColumnCollection)
            _Parent = Value
        End Set
    End Property
#End Region

    Protected Friend Overridable Sub OnDraw( _
                ByVal e As System.Windows.Forms.DrawItemEventArgs, _
                ByVal Bounds As RectangleF, _
                ByVal DataSource As Object, _
                ByVal DisplayMember As String)

        If Not (_Image Is Nothing) Then
            e.Graphics.DrawImage(_Image, _
                        Bounds.X + 3, _
                        Bounds.Y - 8 + Bounds.Height / 2, _
                        16, 16)

            If Bounds.Width > 22 Then
                Bounds.X += 22
                Bounds.Width -= 22
            Else
                Return
            End If
        End If

        Dim Text As String = pGetValue(DataSource, _
                            DisplayMember, _
                            e.Index, _
                            _DataMember)

        If Not (Text Is Nothing OrElse Text.Length = 0) Then
            Dim B As Brush = New SolidBrush(e.ForeColor)
            e.Graphics.DrawString(Text, _
                                e.Font, _
                                B, _
                                Bounds, _
                                _StringFormatter)
            B.Dispose()
        End If
    End Sub

#Region "Get Text"
    Protected Function pGetValue(ByVal DataSource As Object, _
                        ByVal DisplayMember As String, _
                        ByVal Row As Integer, _
                        ByVal Col As String) As String

        If Col Is Nothing OrElse Col.Length = 0 Then Col = DisplayMember

        Try
            If TypeOf DataSource Is System.Data.DataSet Then
                Dim DS As System.Data.DataSet = _
                DirectCast(DataSource, System.Data.DataSet)

                Dim sTable As String = DisplayMember
                If sTable.IndexOf(".") > -1 Then
                    sTable = sTable.Substring(0, sTable.IndexOf(".") - 1)
                End If
                Return DS.Tables(sTable).Rows(Row).Item(Col).ToString

            ElseIf TypeOf DataSource Is System.Data.DataTable Then
                Dim DS As System.Data.DataTable = _
                DirectCast(DataSource, System.Data.DataTable)
                Return DS.Rows(Row).Item(Col).ToString

            ElseIf TypeOf DataSource Is System.Collections.IList Then
                Dim DS As IList = DirectCast(DataSource, IList)
                Return ObjectGetProperty(DS.Item(Row), Col)

            ElseIf TypeOf DataSource Is System.Collections.IDictionary Then
                Dim DS As IDictionary = DirectCast(DataSource, IDictionary)
                Return ObjectGetProperty(DS.Item(Row), Col)

            ElseIf TypeOf DataSource Is IEnumerable Then
                Dim DS As IEnumerable = DirectCast(DataSource, IEnumerable)
                Dim i As Integer = 0
                Dim o As Object
                For Each o In DS
                    i += 1
                    If i = Row Then Return ObjectGetProperty(o, Col)
                Next
                Return String.Empty

            Else
                Return ObjectGetProperty(DataSource, Col)
            End If

        Catch
            Return String.Empty
        End Try
    End Function

    Protected Shared Function ObjectGetProperty(ByVal o As Object, _
                                    ByVal Name As String) As String

        If o Is Nothing Then Return String.Empty
        If Name Is Nothing OrElse Name.Length = 0 Then Return o.ToString

        Try
            Dim T As Type = o.GetType()
            Dim F As Reflection.BindingFlags = _
                    Reflection.BindingFlags.GetField Or _
                    Reflection.BindingFlags.GetProperty Or _
                    Reflection.BindingFlags.Public Or _
                    Reflection.BindingFlags.Instance Or _
                    Reflection.BindingFlags.Static Or _
                    Reflection.BindingFlags.IgnoreCase

            Dim oRes As Object = T.InvokeMember(Name, F, Nothing, o, New Object() {})
            Return oRes.ToString

        Catch
            Return o.ToString
        End Try
    End Function
#End Region

End Class

Imports System.ComponentModel
Imports System.Collections
Imports System.Windows.Forms

Public Class DataColumnCollection : Inherits CollectionBase

    Private _Parent As Control

#Region "Constructors"
    Public Sub New()
        'Do Nothing
    End Sub
    Public Sub New(ByVal Value() As DataColumn)
        AddRange(Value)
    End Sub
    Public Sub New(ByVal Value As DataColumnCollection)
        AddRange(Value)
    End Sub
#End Region

#Region "Add"
    Public Function Add(ByVal Value As DataColumn) As Integer
        Value.Parent = Me
        Return List.Add(Value)
    End Function
    Public Sub AddRange(ByVal Value() As DataColumn)
        Dim oItem As DataColumn
        For Each oItem In Value
            oItem.Parent = Me
            List.Add(oItem)
        Next
    End Sub
    Public Sub AddRange(ByVal Value As DataColumnCollection)
        Dim oItem As DataColumn
        For Each oItem In Value
            oItem.Parent = Me
            List.Add(oItem)
        Next
    End Sub
#End Region

    Public Function Contains(ByVal Value As DataColumn) As Boolean
        Return List.Contains(Value)
    End Function
    Public Sub CopyTo(ByVal array() As DataColumn, ByVal index As Integer)
        List.CopyTo(array, index)
    End Sub
    Public Overloads Function IndexOf(ByVal Value As DataColumn) As Integer
        Return List.IndexOf(Value)
    End Function
    Public Sub Insert(ByVal index As Integer, ByVal Value As DataColumn)
        List.Insert(index, Value)
    End Sub

    Default Public Property Item(ByVal index As Integer) As DataColumn
        Get
            Return DirectCast(List.Item(index), DataColumn)
        End Get
        Set(ByVal Value As DataColumn)
            List.Item(index) = Value
        End Set
    End Property


    Protected Overrides Sub OnInsert(ByVal index As Integer, _
                                                ByVal Value As Object)

        If TypeOf Value Is DataColumn Then
            MyBase.OnInsert(index, Value)
            DirectCast(Value, DataColumn).Parent = Me
        Else
            Throw New ArgumentException()
        End If
    End Sub

    Protected Overrides Sub OnSet(ByVal index As Integer, _
                                            ByVal OldValue As Object, _
                                            ByVal NewValue As Object)

        If TypeOf NewValue Is DataColumn Then
            MyBase.OnSet(index, OldValue, NewValue)
            DirectCast(NewValue, DataColumn).Parent = Me
        Else
            Throw New ArgumentException()
        End If
    End Sub

    Protected Friend Property Parent() As Control
        Get
            Return _Parent
        End Get
        Set(ByVal Value As Control)
            _Parent = Value
        End Set
    End Property

    Public ReadOnly Property ParentWidth() As Integer
        Get
            If _Parent Is Nothing Then
                Return 0
            Else
                Return _Parent.ClientSize.Width
            End If
        End Get
    End Property
End Class

Imports System.Drawing
Imports System.Windows.Forms
Imports System.ComponentModel

Public Class ComboBoxEx : Inherits ComboBox
'Or - Public Class ListBoxEx : Inherits ListBox
    Protected HighlightBrush As Brush
    Protected HighlightPen As Pen

#Region "Constructors"
    Public Sub New()
        DrawMode = DrawMode.OwnerDrawFixed
        ItemHeight += 1
        HighlightBrush = New SolidBrush(SystemColors.Highlight)
	HighlightPen = New Pen(SystemColors.HighlightText)
    End Sub
#End Region

#Region "Overrides"
    Protected Overrides Sub OnDrawItem(ByVal e As DrawItemEventArgs)
        If Not (e.Index = -1) Then
            DrawListBoxItem(e)
        End If
    End Sub

    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing Then
            HighlightBrush.Dispose()
            HighlightPen.Dispose()
        End If
        MyBase.Dispose(disposing)
    End Sub

    <Browsable(False)> _
    Public Shadows Property DrawMode() As DrawMode
        Get
            Return MyBase.DrawMode
        End Get
        Set(ByVal Value As DrawMode)
            MyBase.DrawMode = Value
        End Set
    End Property
#End Region

#Region "Implementation"
    Protected Sub DrawListBoxItem(ByVal e As DrawItemEventArgs)
        '// Draw List box item
        If Enabled AndAlso _
            ((e.State And DrawItemState.Selected) = DrawItemState.Selected) Then

            DrawItemHighlight(e)
        Else
            DrawItemClearHighlight(e)
        End If
        DrawItemText(e)
    End Sub

    Protected Overridable Sub DrawItemText(ByVal e As DrawItemEventArgs)
        Dim currentObject As Object = Items(e.Index)
        Dim item As String = GetItemText(currentObject)
        If Not (item Is Nothing) Then
            Dim B As Brush
            If Enabled Then
                B = New SolidBrush(e.ForeColor)
            Else
                B = SystemBrushes.ControlDark
            End If

            e.Graphics.DrawString(item, _
                    e.Font, _
                    B, _
                    New PointF(e.Bounds.Left + 2, e.Bounds.Top))

            If Enabled Then B.Dispose()
        End If
    End Sub

    Protected Overridable Sub DrawItemHighlight(ByVal e As DrawItemEventArgs)
        Dim g As Graphics = e.Graphics
        Dim b As Rectangle = e.Bounds
        g.FillRectangle(HighlightBrush, b)
        g.DrawRectangle(HighlightPen, b.Left, b.Top, b.Width - 1, b.Height - 1)
    End Sub

    Protected Overridable Sub DrawItemClearHighlight(ByVal e As DrawItemEventArgs)
        e.Graphics.FillRectangle(SystemBrushes.Window, e.Bounds)
    End Sub
#End Region

End Class

Imports System.Drawing
Imports System.Windows.Forms
Imports System.ComponentModel

<DesignerCategory("Component"), _
DefaultProperty("DataSource"), _
TypeConverter("System.Windows.Forms.Design.DataSourceConverter"), _
ToolboxItem(True)> _
Public Class DataComboBoxEx : Inherits ComboBoxEx
'Or - Public Class DataListBoxEx : Inherits ListBoxEx

    Private _Columns As DataColumnCollection
    Private _GridLineColor As Color
    Private _ShowHorizontalGridLines As Boolean
    Private _ShowVerticalGridLines As Boolean

    Public Sub New()
        _ShowVerticalGridLines = True
        _ShowHorizontalGridLines = False
        _Columns = New DataColumnCollection()
        _Columns.Parent = Me

        _GridLineColor = SystemColors.ControlDark
        ItemHeight = Math.Max(ItemHeight, 22)
    End Sub

    Protected Overrides Sub DrawItemText( _
            ByVal e As System.Windows.Forms.DrawItemEventArgs)

        Dim rItem As Rectangle = e.Bounds
        Dim g As Graphics = e.Graphics
        Dim gPen As New Pen(_GridLineColor)
        Dim DS As Object
        If DataSource Is Nothing Then
            DS = Items
        Else
            DS = DataSource
        End If

        Dim rItemF As New RectangleF(rItem.X, rItem.Y, rItem.Width, rItem.Height)
        Dim oItem As DataColumn
        For Each oItem In _Columns
            rItemF.Width = oItem.Width
            oItem.OnDraw(e, rItemF, DS, DisplayMember)
            If _ShowVerticalGridLines Then
                g.DrawLine(gPen, rItemF.Right, rItemF.Y, rItemF.Right, rItemF.Bottom)
            End If
            rItemF.X += rItemF.Width
        Next
        If _ShowHorizontalGridLines Then
            g.DrawLine(gPen, rItem.X, rItem.Bottom - 1, rItem.Right, rItem.Bottom - 1)
        End If

        gPen.Dispose()
    End Sub

    <Category("Behavior"), _
    DesignerSerializationVisibility(DesignerSerializationVisibility.Content)> _
    Public Property Columns() As DataColumnCollection
        Get
            Return _Columns
        End Get
        Set(ByVal Value As DataColumnCollection)
            _Columns = Value
            _Columns.Parent = Me
        End Set
    End Property

    <Category("Appearance")> _
    Public Property GridLineColor() As Color
        Get
            Return _GridLineColor
        End Get
        Set(ByVal Value As Color)
            _GridLineColor = Value
        End Set
    End Property

    <Category("Appearance"), DefaultValue(False)> _
    Public Property ShowHorizontalGridLines() As Boolean
        Get
            Return _ShowHorizontalGridLines
        End Get
        Set(ByVal Value As Boolean)
            _ShowHorizontalGridLines = Value
        End Set
    End Property

    <Category("Appearance"), DefaultValue(True)> _
    Public Property ShowVerticalGridLines() As Boolean
        Get
            Return _ShowVerticalGridLines
        End Get
        Set(ByVal Value As Boolean)
            _ShowVerticalGridLines = Value
        End Set
    End Property

#Region "Hide properies"
    <Browsable(False)> _
    Public Shadows Property DropDownStyle() As ComboBoxStyle
        Get
            Return ComboBoxStyle.DropDown
        End Get
        Set(ByVal Value As ComboBoxStyle)
            MyBase.DropDownStyle = ComboBoxStyle.DropDown
        End Set
    End Property

    <Browsable(False)> _
    Public Shadows Property Sorted() As Boolean
        Get
            Return MyBase.Sorted
        End Get
        Set(ByVal Value As Boolean)
            MyBase.Sorted = Value
        End Set
    End Property
#End Region

End Class