VB.Net/GUI/Control Subclass
Sub class Button class to create a Clock button
<source lang="vbnet"> Imports System Imports System.Collections Imports System.Data Imports System.IO Imports System.Xml.Serialization Imports System.Xml Imports System.Windows.Forms Imports System.Data.SqlClient Imports System.Data.OleDb Public Class MainClass
Shared Sub Main() Dim form1 As Form = New Form1 Application.Run(form1) End Sub
End Class
Public Class Form1
Inherits System.Windows.Forms.Form
- 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 End Sub "Form 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 End If MyBase.Dispose(disposing) End Sub "Required by the Windows Form Designer Private components As System.ruponentModel.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. Friend WithEvents TickButton1 As TickButton <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent() Me.TickButton1 = New TickButton() Me.SuspendLayout() " "TickButton1 " Me.TickButton1.Location = New System.Drawing.Point(16, 120) Me.TickButton1.Name = "TickButton1" Me.TickButton1.Size = New System.Drawing.Size(216, 23) Me.TickButton1.TabIndex = 4 Me.TickButton1.Text = "Design Mode" " "Form1 " Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13) Me.ClientSize = New System.Drawing.Size(240, 189) Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.TickButton1}) Me.Name = "Form1" Me.ResumeLayout(False) End Sub
- End Region
End Class
Public Class TickButton
Inherits System.Windows.Forms.Button
- 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 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 End If MyBase.Dispose(disposing) End Sub "Required by the Windows Form Designer Private components As System.ruponentModel.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. Friend WithEvents ticker As System.Windows.Forms.Timer <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent() Me.ruponents = New System.ruponentModel.Container() Me.ticker = New System.Windows.Forms.Timer(Me.ruponents) " "ticker " End Sub
- End Region
Protected Overrides Sub InitLayout() " are we in design mode? If DesignMode = True Then Text = "Design Mode" Else ticker.Enabled = True End If End Sub Private Sub ticker_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ticker.Tick " update the text... Text = Now.ToString End Sub
End Class
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Subclass Form
<source lang="vbnet"> Imports System Imports System.Drawing Imports System.Windows.Forms Imports System.ruponentModel Imports System.Drawing.Drawing2D Imports System.IO Public Class MainClass
Shared Sub Main() Dim form1 As Form = New Form1 Application.Run(form1)
End Sub
End Class
Public Class Form1
Inherits Ancestor
- 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 End Sub "Form 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 End If MyBase.Dispose(disposing) End Sub "Required by the Windows Form Designer Private components As System.ruponentModel.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() Me.SuspendLayout() " "Descendent " Me.AutoScaleBaseSize = New System.Drawing.Size(5, 14) Me.ClientSize = New System.Drawing.Size(300, 266) Me.HeaderText = "HeaderText" Me.Name = "Descendent" Me.ResumeLayout(False) End Sub
- End Region
" Do NOT include the Handles keyword! Protected Overrides Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) MessageBox.Show("derived") End Sub
End Class
Public Class Ancestor
Inherits System.Windows.Forms.Form
- 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 End Sub "Form 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 End If MyBase.Dispose(disposing) End Sub "Required by the Windows Form Designer Private components As System.ruponentModel.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. Friend WithEvents Panel1 As System.Windows.Forms.Panel Friend WithEvents lblHeader As System.Windows.Forms.Label Friend WithEvents cmdNext As System.Windows.Forms.Button Friend WithEvents GroupBox1 As System.Windows.Forms.GroupBox <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent() Me.Panel1 = New System.Windows.Forms.Panel() Me.lblHeader = New System.Windows.Forms.Label() Me.cmdNext = New System.Windows.Forms.Button() Me.GroupBox1 = New System.Windows.Forms.GroupBox() Me.Panel1.SuspendLayout() Me.SuspendLayout() " "Panel1 " Me.Panel1.Anchor = ((System.Windows.Forms.AnchorStyles.Top Or System.Windows.Forms.AnchorStyles.Left) _ Or System.Windows.Forms.AnchorStyles.Right) Me.Panel1.BackColor = System.Drawing.Color.White Me.Panel1.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle Me.Panel1.Controls.AddRange(New System.Windows.Forms.Control() {Me.lblHeader}) Me.Panel1.Location = New System.Drawing.Point(4, 4) Me.Panel1.Name = "Panel1" Me.Panel1.Size = New System.Drawing.Size(292, 68) Me.Panel1.TabIndex = 0 " "lblHeader " Me.lblHeader.Anchor = ((System.Windows.Forms.AnchorStyles.Top Or System.Windows.Forms.AnchorStyles.Left) _ Or System.Windows.Forms.AnchorStyles.Right) Me.lblHeader.Font = New System.Drawing.Font("Tahoma", 8.25!, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, CType(0, Byte)) Me.lblHeader.Location = New System.Drawing.Point(16, 16) Me.lblHeader.Name = "lblHeader" Me.lblHeader.Size = New System.Drawing.Size(262, 28) Me.lblHeader.TabIndex = 0 Me.lblHeader.Text = "Header Text" " "cmdNext " Me.cmdNext.Anchor = (System.Windows.Forms.AnchorStyles.Bottom Or System.Windows.Forms.AnchorStyles.Right) Me.cmdNext.FlatStyle = System.Windows.Forms.FlatStyle.System Me.cmdNext.Location = New System.Drawing.Point(232, 232) Me.cmdNext.Name = "cmdNext" Me.cmdNext.Size = New System.Drawing.Size(60, 28) Me.cmdNext.TabIndex = 1 Me.cmdNext.Text = "Next" " "GroupBox1 " Me.GroupBox1.Anchor = ((System.Windows.Forms.AnchorStyles.Bottom Or System.Windows.Forms.AnchorStyles.Left) _ Or System.Windows.Forms.AnchorStyles.Right) Me.GroupBox1.Location = New System.Drawing.Point(8, 224) Me.GroupBox1.Name = "GroupBox1" Me.GroupBox1.Size = New System.Drawing.Size(284, 4) Me.GroupBox1.TabIndex = 2 Me.GroupBox1.TabStop = False Me.GroupBox1.Text = "GroupBox1" " "Ancestor " Me.AutoScaleBaseSize = New System.Drawing.Size(5, 14) Me.ClientSize = New System.Drawing.Size(300, 266) Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.GroupBox1, Me.cmdNext, Me.Panel1}) Me.Font = New System.Drawing.Font("Tahoma", 8.25!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte)) Me.Name = "Ancestor" Me.Text = "Ancestor" Me.Panel1.ResumeLayout(False) Me.ResumeLayout(False) End Sub
- End Region
Protected Overridable Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdNext.Click End Sub Public Property HeaderText() As String Get Return lblHeader.Text End Get Set(ByVal Value As String) lblHeader.Text = Value End Set End Property
End Class
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