VB.Net/GUI/User Control — различия между версиями
Admin (обсуждение | вклад) м (1 версия) |
Admin (обсуждение | вклад) м (1 версия) |
(нет различий)
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Текущая версия на 15:44, 26 мая 2010
Sub class UserControl to create your own control
<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 MyControl1 As MyControl <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent() Me.MyControl1 = New MyControl() Me.SuspendLayout() " "MyControl1 " Me.MyControl1.Location = New System.Drawing.Point(8, 8) Me.MyControl1.MessageText = "Hello, world!" Me.MyControl1.Name = "MyControl1" Me.MyControl1.Size = New System.Drawing.Size(152, 104) Me.MyControl1.TabIndex = 0 " "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.MyControl1}) Me.Name = "Form1" Me.ResumeLayout(False) End Sub
- End Region
End Class
Public Class MyControl
Inherits System.Windows.Forms.UserControl Private _messageText As String Event HelloWorld(ByVal sender As Object, ByVal e As System.EventArgs)
- 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 MessageText = "Hello, world!" 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 btnSayHello As System.Windows.Forms.Button Friend WithEvents btnSaySomething As System.Windows.Forms.Button Friend WithEvents btnSaySomethingElse As System.Windows.Forms.Button <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent() Me.btnSayHello = New System.Windows.Forms.Button() Me.btnSaySomething = New System.Windows.Forms.Button() Me.btnSaySomethingElse = New System.Windows.Forms.Button() Me.SuspendLayout() " "btnSayHello " Me.btnSayHello.Location = New System.Drawing.Point(8, 8) Me.btnSayHello.Name = "btnSayHello" Me.btnSayHello.Size = New System.Drawing.Size(136, 23) Me.btnSayHello.TabIndex = 0 Me.btnSayHello.Text = "Say, ""Hello, world!""" " "btnSaySomething " Me.btnSaySomething.Location = New System.Drawing.Point(8, 40) Me.btnSaySomething.Name = "btnSaySomething" Me.btnSaySomething.Size = New System.Drawing.Size(136, 23) Me.btnSaySomething.TabIndex = 1 Me.btnSaySomething.Text = "Say Something" " "btnSaySomethingElse " Me.btnSaySomethingElse.Location = New System.Drawing.Point(8, 72) Me.btnSaySomethingElse.Name = "btnSaySomethingElse" Me.btnSaySomethingElse.Size = New System.Drawing.Size(136, 23) Me.btnSaySomethingElse.TabIndex = 2 Me.btnSaySomethingElse.Text = "Say Something Else" " "MyControl " Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.btnSaySomethingElse, Me.btnSaySomething, Me.btnSayHello}) Me.Name = "MyControl" Me.Size = New System.Drawing.Size(152, 104) Me.ResumeLayout(False) End Sub
- End Region
Private Sub btnSayHello_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnSayHello.Click " raise the event... RaiseEvent HelloWorld(Me, New System.EventArgs()) MsgBox(_messageText) End Sub Private Sub btnSaySomething_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnSaySomething.Click MsgBox("Something!") End Sub Private Sub btnSaySomethingElse_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnSaySomethingElse.Click MsgBox("Something else!") End Sub Public Property MessageText() As String Get Return _messageText End Get Set(ByVal Value As String) " set the text... _messageText = Value " update the button... btnSayHello.Text = "Say """ & _messageText & """" End Set End Property Public Sub ResetMessageText() MessageText = "Hello, world!" End Sub Private Sub MyControl_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load End Sub
End Class
</source>
User-defined control with a timer and a label
<source lang="vbnet"> Imports System Imports System.Drawing Imports System.Windows.Forms
Public Class MainClass
Shared Sub Main() Dim myform As Form = New FrmClock() Application.Run(myform) End Sub " Main
End Class
Public Class FrmClock
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 Friend WithEvents myCClockUserControl As CClockUserControl "Required by the Windows Form Designer Private components As System.ruponentModel.Container "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.myCClockUserControl = New CClockUserControl() Me.SuspendLayout() " "myCClockUserControl " Me.myCClockUserControl.Location = New System.Drawing.Point(24, 24) Me.myCClockUserControl.Name = "myCClockUserControl" Me.myCClockUserControl.Size = New System.Drawing.Size(96, 48) Me.myCClockUserControl.TabIndex = 0 " "FrmClock " Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13) Me.ClientSize = New System.Drawing.Size(144, 93) Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.myCClockUserControl}) Me.Name = "FrmClock" Me.Text = "Clock" Me.ResumeLayout(False) End Sub
- End Region
End Class " create a clock control that inherits from UserControl Public Class CClockUserControl
Inherits UserControl
- 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 " displays time Friend WithEvents lblDisplay As Label " non-visible event-triggering timer object Friend WithEvents tmrClock As Timer "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.ruponents = New System.ruponentModel.Container() Me.tmrClock = New System.Windows.Forms.Timer(Me.ruponents) Me.lblDisplay = New System.Windows.Forms.Label() Me.SuspendLayout() " "tmrClock " Me.tmrClock.Enabled = True " "lblDisplay " Me.lblDisplay.Dock = System.Windows.Forms.DockStyle.Fill Me.lblDisplay.Font = New System.Drawing.Font("Microsoft Sans Serif", 12.0!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte)) Me.lblDisplay.Name = "lblDisplay" Me.lblDisplay.Size = New System.Drawing.Size(150, 72) Me.lblDisplay.TabIndex = 0 Me.lblDisplay.TextAlign = System.Drawing.ContentAlignment.MiddleCenter " "CClockUserControl " Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.lblDisplay}) Me.Name = "CClockUserControl" Me.Size = New System.Drawing.Size(150, 72) Me.ResumeLayout(False) End Sub
- End Region
" update label at every tick Private Sub tmrClock_Tick(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles tmrClock.Tick " get current time (Now), converto to string lblDisplay.Text = DateTime.Now.ToLongTimeString End Sub
End Class
</source>