LayoutEventHandler Delegate
Assembly: System.Windows.Forms (in System.Windows.Forms.dll)
'Declaration Public Delegate Sub LayoutEventHandler ( _ sender As Object, _ e As LayoutEventArgs _ ) 'Usage Dim instance As New LayoutEventHandler(AddressOf HandlerMethod)
Parameters
- sender
- Type: System.Object
The source of the event.
- e
- Type: System.Windows.Forms.LayoutEventArgs
A LayoutEventArgs that contains the event data.
When you create a LayoutEventArgs delegate, you identify the method that will handle the event. To associate the event with your event handler, add an instance of the delegate to the event. The event handler is called whenever the event occurs, unless you remove the delegate. For more information about event handler delegates, see Events and Delegates.
Public Class Form1 Inherits System.Windows.Forms.Form Private WithEvents textBox1 As System.Windows.Forms.TextBox Private label1 As System.Windows.Forms.Label Private layoutButton As System.Windows.Forms.Button Private components As System.ComponentModel.Container = Nothing Public Sub New() InitializeComponent() End Sub Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean) If disposing Then If (components IsNot Nothing) Then components.Dispose() End If End If MyBase.Dispose(disposing) End Sub Private Sub InitializeComponent() Me.layoutButton = New System.Windows.Forms.Button() Me.textBox1 = New System.Windows.Forms.TextBox() Me.label1 = New System.Windows.Forms.Label() Me.SuspendLayout() ' ' layoutButton ' Me.layoutButton.Anchor = System.Windows.Forms.AnchorStyles.Bottom Me.layoutButton.Location = New System.Drawing.Point(72, 88) Me.layoutButton.Name = "layoutButton" Me.layoutButton.Size = New System.Drawing.Size(150, 23) Me.layoutButton.TabIndex = 0 Me.layoutButton.Text = "Hello" ' ' textBox1 ' Me.textBox1.Anchor = System.Windows.Forms.AnchorStyles.Top Or System.Windows.Forms.AnchorStyles.Left Or System.Windows.Forms.AnchorStyles.Right Me.textBox1.Location = New System.Drawing.Point(24, 40) Me.textBox1.Name = "textBox1" Me.textBox1.Size = New System.Drawing.Size(248, 20) Me.textBox1.TabIndex = 1 Me.textBox1.Text = "Hello" ' ' label1 ' Me.label1.Location = New System.Drawing.Point(24, 16) Me.label1.Name = "label1" Me.label1.TabIndex = 2 Me.label1.Text = "Button's Text:" ' ' Form1 ' Me.ClientSize = New System.Drawing.Size(292, 129) Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.label1, Me.textBox1, Me.layoutButton}) Me.Name = "Form1" Me.Text = "Layout Sample" Me.ResumeLayout(False) End Sub ' This method ensures that the form's width is the preferred size of 300 pixels ' or the size of the button plus 50 pixels, whichever amount is less. Private Sub Form1_Layout(ByVal sender As Object, ByVal e As System.Windows.Forms.LayoutEventArgs) Handles MyBase.Layout ' This event is raised once at startup with the AffectedControl ' and AffectedProperty properties on the LayoutEventArgs as null. ' The event provides size preferences for that case. If (e.AffectedControl IsNot Nothing) And (e.AffectedProperty IsNot Nothing) Then ' Ensure that the affected property is the Bounds property ' of the form. If e.AffectedProperty.ToString() = "Bounds" Then ' If layoutButton's width plus a padding of 50 pixels is greater than the preferred ' size of 300 pixels, increase the form's width. If Me.layoutButton.Width + 50 > 300 Then Me.Width = Me.layoutButton.Width + 50 ' If not, keep the form's width at 300 pixels. Else Me.Width = 300 End If ' Center layoutButton on the form. Me.layoutButton.Left = (Me.ClientSize.Width - Me.layoutButton.Width) / 2 End If End If End Sub ' This method sets the Text property of layoutButton to the Text property ' of textBox1. If the new text plus a padding of 20 pixels is larger than ' the preferred size of 150 pixels, increase layoutButton's Width property. Private Sub textBox1_TextChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles textBox1.TextChanged ' Set the Text property of layoutButton. Me.layoutButton.Text = Me.textBox1.Text ' Get the width of the text using the proper font. Dim textWidth As Integer = CInt(Me.CreateGraphics().MeasureString(layoutButton.Text, layoutButton.Font).Width) ' If the width of the text plus a padding of 20 pixels is greater than the preferred size of ' 150 pixels, increase layoutButton's width. If textWidth + 20 > 150 Then ' Setting the size property on any control raises ' the Layout event for its container. Me.layoutButton.Width = textWidth + 20 ' If not, keep layoutButton's width at 150 pixels. Else Me.layoutButton.Width = 150 End If End Sub End Class
Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98
The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.