VB.Net Tutorial/GUI/Timer

Содержание

1 Scrolling Text by Timer
2 Timer event
3 Timer interval
4 Timer Start and Stop
5 Use three timers
6 Use Timer to refresh Label

Scrolling Text by Timer

<source lang="vbnet">Imports System.Windows.Forms public class ScrollingText

  public Shared Sub Main
       Application.Run(New Form1)
  End Sub

End class Public Class Form1

   Inherits System.Windows.Forms.Form
   Public Sub New()
       MyBase.New()
       InitializeComponent()
   End Sub
   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
   Private components As System.ruponentModel.IContainer
   Friend WithEvents Label1 As System.Windows.Forms.Label
   Friend WithEvents Button1 As System.Windows.Forms.Button
   Friend WithEvents Button2 As System.Windows.Forms.Button
   Friend WithEvents Button3 As System.Windows.Forms.Button
   Friend WithEvents Timer1 As System.Windows.Forms.Timer
   <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
       Me.ruponents = New System.ruponentModel.Container
       Me.Label1 = New System.Windows.Forms.Label
       Me.Button1 = New System.Windows.Forms.Button
       Me.Button2 = New System.Windows.Forms.Button
       Me.Button3 = New System.Windows.Forms.Button
       Me.Timer1 = New System.Windows.Forms.Timer(Me.ruponents)
       Me.SuspendLayout()
       "
       "Label1
       "
       Me.Label1.Font = New System.Drawing.Font("Microsoft Sans Serif", 15.75!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
       Me.Label1.Location = New System.Drawing.Point(32, 32)
       Me.Label1.Name = "Label1"
       Me.Label1.Size = New System.Drawing.Size(216, 24)
       Me.Label1.TabIndex = 0
       Me.Label1.Text = "Scrolling Text"
       "
       "Button1
       "
       Me.Button1.Location = New System.Drawing.Point(24, 80)
       Me.Button1.Name = "Button1"
       Me.Button1.Size = New System.Drawing.Size(72, 24)
       Me.Button1.TabIndex = 1
       Me.Button1.Text = "Start"
       "
       "Button2
       "
       Me.Button2.Location = New System.Drawing.Point(112, 80)
       Me.Button2.Name = "Button2"
       Me.Button2.Size = New System.Drawing.Size(64, 24)
       Me.Button2.TabIndex = 2
       Me.Button2.Text = "Stop"
       "
       "Button3
       "
       Me.Button3.Location = New System.Drawing.Point(192, 80)
       Me.Button3.Name = "Button3"
       Me.Button3.Size = New System.Drawing.Size(72, 24)
       Me.Button3.TabIndex = 3
       Me.Button3.Text = "Exit"
       "
       "Timer1
       "
       Me.Timer1.Interval = 300
       "
       "Form1
       "
       Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
       Me.ClientSize = New System.Drawing.Size(292, 150)
       Me.Controls.Add(Me.Button3)
       Me.Controls.Add(Me.Button2)
       Me.Controls.Add(Me.Button1)
       Me.Controls.Add(Me.Label1)
       Me.Name = "Form1"
       Me.Text = "Scroll Text"
       Me.ResumeLayout(False)
   End Sub
   Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
       Do While Label1.Text.Length < 13
           Label1.Text = Label1.Text & " "
       Loop
       Label1.AutoSize = True
       Timer1.Start()
   End Sub
   Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
       Timer1.Stop()
   End Sub
   Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
       End
   End Sub
   Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick
       Label1.Text = Microsoft.VisualBasic.Right(Label1.Text, 1) & Microsoft.VisualBasic.Left(Label1.Text, Label1.Text.Length - 1)
   End Sub

End Class</source>

Timer event

<source lang="vbnet">Imports System.Windows.Forms public class TimerEvent

  public Shared Sub Main
       Application.Run(New Form1)
  End Sub

End class Public Class Form1

   Inherits System.Windows.Forms.Form
   Public Sub New()
       MyBase.New()
       InitializeComponent()
   End Sub
   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
   Private components As System.ruponentModel.IContainer
   Friend WithEvents Label1 As System.Windows.Forms.Label
   Friend WithEvents Label2 As System.Windows.Forms.Label
   Friend WithEvents Timer1 As System.Windows.Forms.Timer
   Friend WithEvents TextBox1 As System.Windows.Forms.TextBox
   Friend WithEvents TextBox2 As System.Windows.Forms.TextBox
   <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
       Me.ruponents = New System.ruponentModel.Container
       Me.Label1 = New System.Windows.Forms.Label
       Me.Label2 = New System.Windows.Forms.Label
       Me.Timer1 = New System.Windows.Forms.Timer(Me.ruponents)
       Me.TextBox1 = New System.Windows.Forms.TextBox
       Me.TextBox2 = New System.Windows.Forms.TextBox
       Me.SuspendLayout()
       "
       "Label1
       "
       Me.Label1.Location = New System.Drawing.Point(16, 24)
       Me.Label1.Name = "Label1"
       Me.Label1.Size = New System.Drawing.Size(112, 24)
       Me.Label1.TabIndex = 0
       Me.Label1.Text = "Systen Date"
       "
       "Label2
       "
       Me.Label2.Location = New System.Drawing.Point(16, 80)
       Me.Label2.Name = "Label2"
       Me.Label2.Size = New System.Drawing.Size(112, 24)
       Me.Label2.TabIndex = 1
       Me.Label2.Text = "System Time"
       "
       "Timer1
       "
       "
       "TextBox1
       "
       Me.TextBox1.Location = New System.Drawing.Point(112, 16)
       Me.TextBox1.Name = "TextBox1"
       Me.TextBox1.Size = New System.Drawing.Size(104, 20)
       Me.TextBox1.TabIndex = 2
       Me.TextBox1.Text = ""
       "
       "TextBox2
       "
       Me.TextBox2.Location = New System.Drawing.Point(112, 72)
       Me.TextBox2.Name = "TextBox2"
       Me.TextBox2.Size = New System.Drawing.Size(104, 20)
       Me.TextBox2.TabIndex = 3
       Me.TextBox2.Text = ""
       "
       "Form1
       "
       Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
       Me.ClientSize = New System.Drawing.Size(292, 158)
       Me.Controls.Add(Me.TextBox2)
       Me.Controls.Add(Me.TextBox1)
       Me.Controls.Add(Me.Label2)
       Me.Controls.Add(Me.Label1)
       Me.Name = "Form1"
       Me.Text = "Form1"
       Me.ResumeLayout(False)
   End Sub
   Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick
       Dim TDay As String
       Dim i As Short
       TextBox2.Text = CStr(TimeOfDay)
       i = Weekday(Today)
       Select Case i
           Case 1
               TDay = "Sunday"
           Case 2
               TDay = "Monday"
           Case 3
               TDay = "Tuesday"
           Case 4
               TDay = "Wednesday"
           Case 5
               TDay = "Thursday"
           Case 6
               TDay = "Friday"
           Case 7
               TDay = "Saturday"
       End Select
       TextBox1.Text = TDay & "," & Today
   End Sub
   Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
       Me.Timer1.Start()
   End Sub

End Class</source>

Timer interval

<source lang="vbnet">imports System imports System.Drawing imports System.Windows.Forms public class Timers : inherits Form

 dim lblTime as Label
 public sub New()
   Size = new Size(300,100)
   lblTime = new Label()
   lblTime.Parent = me
   lblTime.Size = new Size(200, 25)
   lblTime.Location = new Point(20,20)
   lblTime.BorderStyle = BorderStyle.FixedSingle
   lblTime.TextAlign = ContentAlignment.MiddleCenter
   dim t as new Timer()
   t.Interval = 100
   t.Start()
   AddHandler t.Tick, AddressOf t_Tick
 end sub
 public shared sub Main() 
   Application.Run(new Timers())
 end sub
 private sub t_Tick(ByVal sender as object,ByVal e as EventArgs)
   lblTime.Text = DateTime.Now.ToString("dddd, MMMM d, yyyy  h:mm:ss tt")
 end sub

end class</source>

Timer Start and Stop

<source lang="vbnet">Imports System.Windows.Forms public class ScrollingText

  public Shared Sub Main
       Application.Run(New Form1)
  End Sub

End class Public Class Form1

   Inherits System.Windows.Forms.Form
   Public Sub New()
       MyBase.New()
       InitializeComponent()
   End Sub
   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
   Private components As System.ruponentModel.IContainer
   Friend WithEvents Label1 As System.Windows.Forms.Label
   Friend WithEvents Button1 As System.Windows.Forms.Button
   Friend WithEvents Button2 As System.Windows.Forms.Button
   Friend WithEvents Button3 As System.Windows.Forms.Button
   Friend WithEvents Timer1 As System.Windows.Forms.Timer
   <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
       Me.ruponents = New System.ruponentModel.Container
       Me.Label1 = New System.Windows.Forms.Label
       Me.Button1 = New System.Windows.Forms.Button
       Me.Button2 = New System.Windows.Forms.Button
       Me.Button3 = New System.Windows.Forms.Button
       Me.Timer1 = New System.Windows.Forms.Timer(Me.ruponents)
       Me.SuspendLayout()
       "
       "Label1
       "
       Me.Label1.Font = New System.Drawing.Font("Microsoft Sans Serif", 15.75!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
       Me.Label1.Location = New System.Drawing.Point(32, 32)
       Me.Label1.Name = "Label1"
       Me.Label1.Size = New System.Drawing.Size(216, 24)
       Me.Label1.TabIndex = 0
       Me.Label1.Text = "Scrolling Text"
       "
       "Button1
       "
       Me.Button1.Location = New System.Drawing.Point(24, 80)
       Me.Button1.Name = "Button1"
       Me.Button1.Size = New System.Drawing.Size(72, 24)
       Me.Button1.TabIndex = 1
       Me.Button1.Text = "Start"
       "
       "Button2
       "
       Me.Button2.Location = New System.Drawing.Point(112, 80)
       Me.Button2.Name = "Button2"
       Me.Button2.Size = New System.Drawing.Size(64, 24)
       Me.Button2.TabIndex = 2
       Me.Button2.Text = "Stop"
       "
       "Button3
       "
       Me.Button3.Location = New System.Drawing.Point(192, 80)
       Me.Button3.Name = "Button3"
       Me.Button3.Size = New System.Drawing.Size(72, 24)
       Me.Button3.TabIndex = 3
       Me.Button3.Text = "Exit"
       "
       "Timer1
       "
       Me.Timer1.Interval = 300
       "
       "Form1
       "
       Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
       Me.ClientSize = New System.Drawing.Size(292, 150)
       Me.Controls.Add(Me.Button3)
       Me.Controls.Add(Me.Button2)
       Me.Controls.Add(Me.Button1)
       Me.Controls.Add(Me.Label1)
       Me.Name = "Form1"
       Me.Text = "Scroll Text"
       Me.ResumeLayout(False)
   End Sub
   Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
       Do While Label1.Text.Length < 13
           Label1.Text = Label1.Text & " "
       Loop
       Label1.AutoSize = True
       Timer1.Start()
   End Sub
   Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
       Timer1.Stop()
   End Sub
   Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
       End
   End Sub
   Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick
       Label1.Text = Microsoft.VisualBasic.Right(Label1.Text, 1) & Microsoft.VisualBasic.Left(Label1.Text, Label1.Text.Length - 1)
   End Sub

End Class</source>

Use three timers

<source lang="vbnet">Imports System.Windows.Forms

public class ThreeTimers

  public Shared Sub Main
       Application.Run(New Form1)
  End Sub

End class Public Class Form1

   Private Sub tmrTenthSecond_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles tmrTenthSecond.Tick
       lblTenthSecond.Text = Now.ToString("hh:mm:ss.f")
   End Sub
   Private Sub tmrSecond_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles tmrSecond.Tick
       lblSeconds.Text = Now.ToString("hh:mm:ss")
   End Sub
   Private Sub tmrTenSeconds_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles tmrTenSeconds.Tick
       lblTenSeconds.Text = Now.ToString("hh:mm:ss")
   End Sub
   " Display initial times.
   Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
       lblTenthSecond.Text = Now.ToString("hh:mm:ss.f")
       lblSeconds.Text = Now.ToString("hh:mm:ss")
       lblTenSeconds.Text = Now.ToString("hh:mm:ss")
   End Sub

End Class <Global.Microsoft.VisualBasic.rupilerServices.DesignerGenerated()> _ Partial Public Class Form1

   Inherits System.Windows.Forms.Form
   "Form overrides dispose to clean up the component list.
   <System.Diagnostics.DebuggerNonUserCode()> _
   Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
       If disposing AndAlso components IsNot Nothing Then
           components.Dispose()
       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.ruponents = New System.ruponentModel.Container
       Me.tmrTenthSecond = New System.Windows.Forms.Timer(Me.ruponents)
       Me.tmrSecond = New System.Windows.Forms.Timer(Me.ruponents)
       Me.tmrTenSeconds = New System.Windows.Forms.Timer(Me.ruponents)
       Me.Label1 = New System.Windows.Forms.Label
       Me.Label2 = New System.Windows.Forms.Label
       Me.Label3 = New System.Windows.Forms.Label
       Me.lblTenthSecond = New System.Windows.Forms.Label
       Me.lblSeconds = New System.Windows.Forms.Label
       Me.lblTenSeconds = New System.Windows.Forms.Label
       Me.SuspendLayout()
       "
       "tmrTenthSecond
       "
       Me.tmrTenthSecond.Enabled = True
       "
       "tmrSecond
       "
       Me.tmrSecond.Enabled = True
       Me.tmrSecond.Interval = 1000
       "
       "tmrTenSeconds
       "
       Me.tmrTenSeconds.Enabled = True
       Me.tmrTenSeconds.Interval = 10000
       "
       "Label1
       "
       Me.Label1.AutoSize = True
       Me.Label1.Location = New System.Drawing.Point(8, 8)
       Me.Label1.Name = "Label1"
       Me.Label1.Size = New System.Drawing.Size(46, 13)
       Me.Label1.TabIndex = 0
       Me.Label1.Text = "1/10 sec"
       "
       "Label2
       "
       Me.Label2.AutoSize = True
       Me.Label2.Location = New System.Drawing.Point(8, 32)
       Me.Label2.Name = "Label2"
       Me.Label2.Size = New System.Drawing.Size(29, 13)
       Me.Label2.TabIndex = 1
       Me.Label2.Text = "1 sec"
       "
       "Label3
       "
       Me.Label3.AutoSize = True
       Me.Label3.Location = New System.Drawing.Point(8, 56)
       Me.Label3.Name = "Label3"
       Me.Label3.Size = New System.Drawing.Size(35, 13)
       Me.Label3.TabIndex = 2
       Me.Label3.Text = "10 sec"
       "
       "lblTenthSecond
       "
       Me.lblTenthSecond.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D
       Me.lblTenthSecond.Location = New System.Drawing.Point(72, 8)
       Me.lblTenthSecond.Name = "lblTenthSecond"
       Me.lblTenthSecond.Size = New System.Drawing.Size(80, 16)
       Me.lblTenthSecond.TabIndex = 3
       "
       "lblSeconds
       "
       Me.lblSeconds.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D
       Me.lblSeconds.Location = New System.Drawing.Point(72, 32)
       Me.lblSeconds.Name = "lblSeconds"
       Me.lblSeconds.Size = New System.Drawing.Size(80, 16)
       Me.lblSeconds.TabIndex = 4
       "
       "lblTenSeconds
       "
       Me.lblTenSeconds.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D
       Me.lblTenSeconds.Location = New System.Drawing.Point(72, 56)
       Me.lblTenSeconds.Name = "lblTenSeconds"
       Me.lblTenSeconds.Size = New System.Drawing.Size(80, 16)
       Me.lblTenSeconds.TabIndex = 5
       "
       "Form1
       "
       Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
       Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
       Me.ClientSize = New System.Drawing.Size(167, 88)
       Me.Controls.Add(Me.lblTenSeconds)
       Me.Controls.Add(Me.lblSeconds)
       Me.Controls.Add(Me.lblTenthSecond)
       Me.Controls.Add(Me.Label3)
       Me.Controls.Add(Me.Label2)
       Me.Controls.Add(Me.Label1)
       Me.Name = "Form1"
       Me.Text = "UseTimer"
       Me.ResumeLayout(False)
       Me.PerformLayout()
   End Sub
   Friend WithEvents tmrTenthSecond As System.Windows.Forms.Timer
   Friend WithEvents tmrSecond As System.Windows.Forms.Timer
   Friend WithEvents tmrTenSeconds As System.Windows.Forms.Timer
   Friend WithEvents Label1 As System.Windows.Forms.Label
   Friend WithEvents Label2 As System.Windows.Forms.Label
   Friend WithEvents Label3 As System.Windows.Forms.Label
   Friend WithEvents lblTenthSecond As System.Windows.Forms.Label
   Friend WithEvents lblSeconds As System.Windows.Forms.Label
   Friend WithEvents lblTenSeconds As System.Windows.Forms.Label

End Class</source>

Use Timer to refresh Label

<source lang="vbnet">Imports System.Windows.Forms <Global.Microsoft.VisualBasic.rupilerServices.DesignerGenerated()> _ Partial Class Form1

   Inherits System.Windows.Forms.Form
   "Form overrides dispose to clean up the component list.
   <System.Diagnostics.DebuggerNonUserCode()> _
   Protected Overrides Sub Dispose(ByVal disposing As Boolean)
       If disposing AndAlso components IsNot Nothing Then
           components.Dispose()
       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.ruponents = New System.ruponentModel.Container
       Me.CurrentTime = New System.Windows.Forms.Label
       Me.ClockTimer = New System.Windows.Forms.Timer(Me.ruponents)
       Me.SuspendLayout()
       "
       "CurrentTime
       "
       Me.CurrentTime.AutoSize = True
       Me.CurrentTime.Location = New System.Drawing.Point(8, 8)
       Me.CurrentTime.Name = "CurrentTime"
       Me.CurrentTime.Size = New System.Drawing.Size(39, 13)
       Me.CurrentTime.TabIndex = 0
       Me.CurrentTime.Text = "Label1"
       "
       "ClockTimer
       "
       Me.ClockTimer.Enabled = True
       Me.ClockTimer.Interval = 1000
       "
       "Form1
       "
       Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
       Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
       Me.ClientSize = New System.Drawing.Size(292, 35)
       Me.Controls.Add(Me.CurrentTime)
       Me.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedSingle
       Me.MaximizeBox = False
       Me.Name = "Form1"
       Me.Text = "Clock Timer"
       Me.ResumeLayout(False)
       Me.PerformLayout()
   End Sub
   Friend WithEvents CurrentTime As System.Windows.Forms.Label
   Friend WithEvents ClockTimer As System.Windows.Forms.Timer

End Class Public Class Form1

   Private Sub ClockTimer_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ClockTimer.Tick
       CurrentTime.Text = Now.ToLongTimeString
   End Sub

End Class

public class ClockTimerDemo

  public Shared Sub Main
       Application.Run(New Form1)
  End Sub

End class</source>

VB.Net Tutorial/GUI/Timer

Содержание

Scrolling Text by Timer

Timer event

Timer interval

Timer Start and Stop

Use three timers

Use Timer to refresh Label

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