Control.PerformLayout Method

Reference

Definition

Namespace:: System.Windows.Forms

Assembly:: System.Windows.Forms.dll

Important

Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.

Forces the control to apply layout logic to child controls.

Overloads

PerformLayout(Control, String)	Forces the control to apply layout logic to all its child controls.
PerformLayout()	Forces the control to apply layout logic to all its child controls.

PerformLayout(Control, String)

Forces the control to apply layout logic to all its child controls.

public:
 void PerformLayout(System::Windows::Forms::Control ^ affectedControl, System::String ^ affectedProperty);

public void PerformLayout (System.Windows.Forms.Control affectedControl, string affectedProperty);

public void PerformLayout (System.Windows.Forms.Control? affectedControl, string? affectedProperty);

member this.PerformLayout : System.Windows.Forms.Control * string -> unit

Public Sub PerformLayout (affectedControl As Control, affectedProperty As String)

Parameters

affectedControl: Control

A Control that represents the most recently changed control.

affectedProperty: String

The name of the most recently changed property on the control.

Examples

The following code example demonstrates how to use the PerformLayout method. It also demonstrates ways in which the Layout event is raised. In this example, the Click event handler for Button1 explicitly calls PerformLayout. The Click event handler for Button2 implicitly calls PerformLayout. PerformLayout is also called when the form is loaded. Button3 returns the control to the state it was in when loaded. In each case, the Layout event is raised.

This is a complete example. To run the example, paste the following code in a blank form.

using namespace System;
using namespace System::Windows::Forms;
using namespace System::Drawing;

// This custom control has the Layout event implented so that when 
// PerformLayout(AffectedControl, AffectedProperty) is called 
// on the control, where AffectedProperty equals "Bounds" the 
// textbox is centered on the control.
public ref class LayoutControl: public System::Windows::Forms::UserControl
{
public private:
   System::Windows::Forms::TextBox^ TextBox1;

public:
   LayoutControl()
      : UserControl()
   {
      InitializeComponent();
   }


private:
   void InitializeComponent()
   {
      this->TextBox1 = gcnew System::Windows::Forms::TextBox;
      this->SuspendLayout();
      this->TextBox1->BorderStyle = System::Windows::Forms::BorderStyle::FixedSingle;
      this->TextBox1->Name = "TextBox1";
      this->TextBox1->TabIndex = 0;
      this->BackColor = System::Drawing::SystemColors::ControlDark;
      this->Controls->Add( this->TextBox1 );
      this->Name = "LayoutControl";
      this->ResumeLayout( false );
      this->Layout += gcnew LayoutEventHandler( this, &LayoutControl::LayoutControl_Layout );
   }


   // This method is called when the Layout event is fired. 
   // This happens by during the initial load, by calling PerformLayout
   // or by resizing, adding or removing controls or other actions that 
   // affect how the control is laid out. This method checks the 
   // value of e.AffectedProperty and changes the look of the 
   // control accordingly. 
   void LayoutControl_Layout( Object^ /*sender*/, System::Windows::Forms::LayoutEventArgs^ e )
   {
      if ( e->AffectedProperty != nullptr )
      {
         if ( e->AffectedProperty->Equals( "Bounds" ) )
         {
            TextBox1->Left = (this->Width - TextBox1->Width) / 2;
            TextBox1->Top = (this->Height - TextBox1->Height) / 2;
         }
      }
      else
      {
         this->Size = System::Drawing::Size( 150, 160 );
         TextBox1->Location = System::Drawing::Point( 16, 24 );
      }

      TextBox1->Text = String::Format( "Left = {0} Top = {1}", TextBox1->Left, TextBox1->Top );
   }

};

public ref class LayoutForm: public System::Windows::Forms::Form
{
public:
   LayoutForm()
      : Form()
   {
      InitializeComponent();
   }


public private:
   System::Windows::Forms::Button^ Button1;
   System::Windows::Forms::Button^ Button2;
   LayoutControl^ LayoutControl1;
   System::Windows::Forms::Button^ Button3;

private:
   void InitializeComponent()
   {
      this->Button1 = gcnew System::Windows::Forms::Button;
      this->Button2 = gcnew System::Windows::Forms::Button;
      this->Button3 = gcnew System::Windows::Forms::Button;
      this->LayoutControl1 = gcnew LayoutControl;
      this->SuspendLayout();
      this->Button1->Location = System::Drawing::Point( 16, 16 );
      this->Button1->Name = "Button1";
      this->Button1->Size = System::Drawing::Size( 120, 32 );
      this->Button1->TabIndex = 0;
      this->Button1->Text = "Center textbox on control";
      this->Button2->Location = System::Drawing::Point( 152, 16 );
      this->Button2->Name = "Button2";
      this->Button2->Size = System::Drawing::Size( 104, 32 );
      this->Button2->TabIndex = 3;
      this->Button2->Text = "Shrink user control";
      this->Button3->Location = System::Drawing::Point( 96, 232 );
      this->Button3->Name = "Button3";
      this->Button3->TabIndex = 5;
      this->Button3->Text = "Reset";
      this->LayoutControl1->BackColor = System::Drawing::SystemColors::ControlDark;
      this->LayoutControl1->Location = System::Drawing::Point( 72, 64 );
      this->LayoutControl1->Name = "LayoutControl1";
      this->LayoutControl1->Size = System::Drawing::Size( 150, 160 );
      this->LayoutControl1->TabIndex = 6;
      this->ClientSize = System::Drawing::Size( 292, 266 );
      this->Controls->Add( this->Button3 );
      this->Controls->Add( this->Button2 );
      this->Controls->Add( this->Button1 );
      this->Controls->Add( this->LayoutControl1 );
      this->Name = "Form1";
      this->Text = "Form1";
      this->ResumeLayout( false );
      this->Button1->Click += gcnew System::EventHandler( this,&LayoutForm::Button1_Click );
      this->Button2->Click += gcnew System::EventHandler( this,&LayoutForm::Button2_Click );
      this->Button3->Click += gcnew System::EventHandler( this,&LayoutForm::Button3_Click );
   }


   // This method explicitly calls raises the layout event on 
   // LayoutControl1, changing the Bounds property.
   void Button1_Click( System::Object^ /*sender*/, System::EventArgs^ /*e*/ )
   {
      LayoutControl1->PerformLayout( LayoutControl1, "Bounds" );
   }


   // This resize of LayoutControl1 implicitly triggers the layout event. 
   //  Changing the size of the control affects its Bounds property.
   void Button2_Click( System::Object^ /*sender*/, System::EventArgs^ /*e*/ )
   {
      LayoutControl1->Size = System::Drawing::Size( 100, 100 );
   }


   // This method explicitly calls PerformLayout with no parameters, 
   // which raises the Layout event with the LayoutEventArgs properties
   // equal to Nothing.
   void Button3_Click( System::Object^ /*sender*/, System::EventArgs^ /*e*/ )
   {
      LayoutControl1->PerformLayout();
   }

};


[System::STAThread]
int main()
{
   Application::Run( gcnew LayoutForm );
}


using System.Windows.Forms;
using System.Drawing;

public class LayoutForm:
    System.Windows.Forms.Form

{
    public LayoutForm() : base()
    {        
        InitializeComponent();
    }

    internal System.Windows.Forms.Button Button1;
    internal System.Windows.Forms.Button Button2;
    internal LayoutControl LayoutControl1;
    internal System.Windows.Forms.Button Button3;

    private void InitializeComponent()
    {
        this.Button1 = new System.Windows.Forms.Button();
        this.Button2 = new System.Windows.Forms.Button();
        this.Button3 = new System.Windows.Forms.Button();
        this.LayoutControl1 = new LayoutControl();
        this.SuspendLayout();
        this.Button1.Location = new System.Drawing.Point(16, 16);
        this.Button1.Name = "Button1";
        this.Button1.Size = new System.Drawing.Size(120, 32);
        this.Button1.TabIndex = 0;
        this.Button1.Text = "Center textbox on control";
        this.Button2.Location = new System.Drawing.Point(152, 16);
        this.Button2.Name = "Button2";
        this.Button2.Size = new System.Drawing.Size(104, 32);
        this.Button2.TabIndex = 3;
        this.Button2.Text = "Shrink user control";
        this.Button3.Location = new System.Drawing.Point(96, 232);
        this.Button3.Name = "Button3";
        this.Button3.TabIndex = 5;
        this.Button3.Text = "Reset";
        this.LayoutControl1.BackColor = System.Drawing.SystemColors.ControlDark;
        this.LayoutControl1.Location = new System.Drawing.Point(72, 64);
        this.LayoutControl1.Name = "LayoutControl1";
        this.LayoutControl1.Size = new System.Drawing.Size(150, 160);
        this.LayoutControl1.TabIndex = 6;
        this.ClientSize = new System.Drawing.Size(292, 266);
        this.Controls.Add(this.Button3);
        this.Controls.Add(this.Button2);
        this.Controls.Add(this.Button1);
        this.Controls.Add(this.LayoutControl1);
        this.Name = "Form1";
        this.Text = "Form1";
        this.ResumeLayout(false);
        this.Button1.Click += new System.EventHandler(Button1_Click);
        this.Button2.Click += new System.EventHandler(Button2_Click);
        this.Button3.Click += new System.EventHandler(Button3_Click);
    }

    [System.STAThread]
    public static void Main()
    {
        Application.Run(new LayoutForm());
    }

    // This method explicitly calls raises the layout event on 
    // LayoutControl1, changing the Bounds property.
    private void Button1_Click(System.Object sender, System.EventArgs e)
    {
        LayoutControl1.PerformLayout(LayoutControl1, "Bounds");
    }

    // This resize of LayoutControl1 implicitly triggers the layout event. 
    //  Changing the size of the control affects its Bounds property.
    private void Button2_Click(System.Object sender, System.EventArgs e)
    {
        LayoutControl1.Size = new System.Drawing.Size(100, 100);
    }

    // This method explicitly calls PerformLayout with no parameters, 
    // which raises the Layout event with the LayoutEventArgs properties
    // equal to Nothing.
    private void Button3_Click(System.Object sender, System.EventArgs e)
    {
        LayoutControl1.PerformLayout();
    }
}

// This custom control has the Layout event implented so that when 
// PerformLayout(AffectedControl, AffectedProperty) is called 
// on the control, where AffectedProperty equals "Bounds" the 
// textbox is centered on the control.
public class LayoutControl:
    System.Windows.Forms.UserControl
{
    internal System.Windows.Forms.TextBox TextBox1;

    public LayoutControl() : base()
    {        
        InitializeComponent();
    }

    private void InitializeComponent()
    {
        this.TextBox1 = new System.Windows.Forms.TextBox();
        this.SuspendLayout();
        this.TextBox1.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
        this.TextBox1.Name = "TextBox1";
        this.TextBox1.TabIndex = 0;
        this.BackColor = System.Drawing.SystemColors.ControlDark;
        this.Controls.Add(this.TextBox1);
        this.Name = "LayoutControl";
        this.ResumeLayout(false);
        this.Layout += new LayoutEventHandler(LayoutControl_Layout);
    }

    // This method is called when the Layout event is fired. 
    // This happens by during the initial load, by calling PerformLayout
    // or by resizing, adding or removing controls or other actions that 
    // affect how the control is laid out. This method checks the 
    // value of e.AffectedProperty and changes the look of the 
    // control accordingly. 
    private void LayoutControl_Layout(object sender, 
        System.Windows.Forms.LayoutEventArgs e)
    {
        if (e.AffectedProperty != null)
        {
            if (e.AffectedProperty.Equals("Bounds"))
            {
                TextBox1.Left = (this.Width-TextBox1.Width)/2;
                TextBox1.Top = (this.Height-TextBox1.Height)/2;
            }
        }
        else
        {
            this.Size = new System.Drawing.Size(150, 160);
            TextBox1.Location = new System.Drawing.Point(16, 24);
        }
        TextBox1.Text = "Left = "+TextBox1.Left+" Top = "+TextBox1.Top;
    }
}


Imports System.Windows.Forms
Imports System.Drawing



Public Class LayoutForm
    Inherits System.Windows.Forms.Form

    Public Sub New()
        MyBase.New()
        InitializeComponent()
    End Sub

    Friend WithEvents Button1 As System.Windows.Forms.Button
    Friend WithEvents Button2 As System.Windows.Forms.Button
    Friend WithEvents LayoutControl1 As LayoutControl
    Friend WithEvents Button3 As System.Windows.Forms.Button

    Private Sub InitializeComponent()
        Me.Button1 = New System.Windows.Forms.Button
        Me.Button2 = New System.Windows.Forms.Button
        Me.Button3 = New System.Windows.Forms.Button
        Me.LayoutControl1 = New LayoutControl
        Me.SuspendLayout()
        Me.Button1.Location = New System.Drawing.Point(16, 16)
        Me.Button1.Name = "Button1"
        Me.Button1.Size = New System.Drawing.Size(120, 32)
        Me.Button1.TabIndex = 0
        Me.Button1.Text = "Center textbox on control"
        Me.Button2.Location = New System.Drawing.Point(152, 16)
        Me.Button2.Name = "Button2"
        Me.Button2.Size = New System.Drawing.Size(104, 32)
        Me.Button2.TabIndex = 3
        Me.Button2.Text = "Shrink user control"
        Me.Button3.Location = New System.Drawing.Point(96, 232)
        Me.Button3.Name = "Button3"
        Me.Button3.TabIndex = 5
        Me.Button3.Text = "Reset"
        Me.LayoutControl1.BackColor = System.Drawing.SystemColors.ControlDark
        Me.LayoutControl1.Location = New System.Drawing.Point(72, 64)
        Me.LayoutControl1.Name = "LayoutControl1"
        Me.LayoutControl1.Size = New System.Drawing.Size(150, 160)
        Me.LayoutControl1.TabIndex = 6
        Me.ClientSize = New System.Drawing.Size(292, 266)
        Me.Controls.Add(Me.Button3)
        Me.Controls.Add(Me.Button2)
        Me.Controls.Add(Me.Button1)
        Me.Controls.Add(Me.LayoutControl1)
        Me.Name = "Form1"
        Me.Text = "Form1"
        Me.ResumeLayout(False)

    End Sub

    <System.STAThread()> Shared Sub Main()
        Application.Run(New LayoutForm)
    End Sub


   
    ' This method explicitly calls raises the layout event on 
    ' LayoutControl1, changing the Bounds property.
    Private Sub Button1_Click(ByVal sender As System.Object, _
        ByVal e As System.EventArgs) Handles Button1.Click
        LayoutControl1.PerformLayout(LayoutControl1, "Bounds")
    End Sub

    ' This resize of LayoutControl1 implicitly triggers the layout event. 
    '   Changing the size of the control affects its Bounds property.
    Private Sub Button2_Click(ByVal sender As System.Object, _
        ByVal e As System.EventArgs) Handles Button2.Click
        LayoutControl1.Size = New System.Drawing.Size(100, 100)
    End Sub

    ' This method explicitly calls PerformLayout with no parameters, 
    ' which raises the Layout event with the LayoutEventArgs properties
    ' equal to Nothing.
    Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
        LayoutControl1.PerformLayout()
    End Sub

End Class


'This custom control has the Layout event implented so that when 
'PerformLayout(AffectedControl, AffectedProperty) is called on the control, 
'where AffectedProperty equals "Bounds" the textbox is centered on the control.
Public Class LayoutControl
    Inherits System.Windows.Forms.UserControl
    Friend WithEvents TextBox1 As System.Windows.Forms.TextBox

    Public Sub New()
        MyBase.New()
        InitializeComponent()
    End Sub

    Private Sub InitializeComponent()
        Me.TextBox1 = New System.Windows.Forms.TextBox
        Me.SuspendLayout()
        Me.TextBox1.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle
        Me.TextBox1.Name = "TextBox1"
        Me.TextBox1.TabIndex = 0
        Me.BackColor = System.Drawing.SystemColors.ControlDark
        Me.Controls.Add(Me.TextBox1)
        Me.Name = "LayoutControl"
        Me.ResumeLayout(False)

    End Sub

    'This method is called when the Layout event is fired. This happens by during the initial load,
    'by calling PerformLayout or by resizing, adding or removing controls or other actions that 
    'affect how the control is laid out. This method checks the value of e.AffectedProperty
    'and changes the look of the control accordingly. 
    Private Sub LayoutControl_Layout(ByVal sender As Object, ByVal e As System.Windows.Forms.LayoutEventArgs) Handles MyBase.Layout
        If e.AffectedProperty IsNot Nothing Then
            If e.AffectedProperty.Equals("Bounds") Then
                TextBox1.Left = (Me.Width - TextBox1.Width) / 2
                TextBox1.Top = (Me.Height - TextBox1.Height) / 2
            End If
        Else
            Me.Size = New System.Drawing.Size(150, 160)
            TextBox1.Location = New System.Drawing.Point(16, 24)
        End If
        TextBox1.Text = "Left = " & TextBox1.Left & " Top = " & TextBox1.Top
    End Sub

End Class

Remarks

If the SuspendLayout method was called before calling the PerformLayout method, the Layout event is suppressed.

The affectedControl and affectedProperty parameters can both be set to null. Doing so causes the AffectedControl and AffectedProperty properties of the LayoutEventArgs created to be set to null.

Applies to

PerformLayout()

Forces the control to apply layout logic to all its child controls.

public:
 void PerformLayout();

public void PerformLayout ();

member this.PerformLayout : unit -> unit

Public Sub PerformLayout ()

Examples

This is a complete example. To run the example, paste the following code in a blank form.

using namespace System;
using namespace System::Windows::Forms;
using namespace System::Drawing;

// This custom control has the Layout event implented so that when 
// PerformLayout(AffectedControl, AffectedProperty) is called 
// on the control, where AffectedProperty equals "Bounds" the 
// textbox is centered on the control.
public ref class LayoutControl: public System::Windows::Forms::UserControl
{
public private:
   System::Windows::Forms::TextBox^ TextBox1;

public:
   LayoutControl()
      : UserControl()
   {
      InitializeComponent();
   }


private:
   void InitializeComponent()
   {
      this->TextBox1 = gcnew System::Windows::Forms::TextBox;
      this->SuspendLayout();
      this->TextBox1->BorderStyle = System::Windows::Forms::BorderStyle::FixedSingle;
      this->TextBox1->Name = "TextBox1";
      this->TextBox1->TabIndex = 0;
      this->BackColor = System::Drawing::SystemColors::ControlDark;
      this->Controls->Add( this->TextBox1 );
      this->Name = "LayoutControl";
      this->ResumeLayout( false );
      this->Layout += gcnew LayoutEventHandler( this, &LayoutControl::LayoutControl_Layout );
   }


   // This method is called when the Layout event is fired. 
   // This happens by during the initial load, by calling PerformLayout
   // or by resizing, adding or removing controls or other actions that 
   // affect how the control is laid out. This method checks the 
   // value of e.AffectedProperty and changes the look of the 
   // control accordingly. 
   void LayoutControl_Layout( Object^ /*sender*/, System::Windows::Forms::LayoutEventArgs^ e )
   {
      if ( e->AffectedProperty != nullptr )
      {
         if ( e->AffectedProperty->Equals( "Bounds" ) )
         {
            TextBox1->Left = (this->Width - TextBox1->Width) / 2;
            TextBox1->Top = (this->Height - TextBox1->Height) / 2;
         }
      }
      else
      {
         this->Size = System::Drawing::Size( 150, 160 );
         TextBox1->Location = System::Drawing::Point( 16, 24 );
      }

      TextBox1->Text = String::Format( "Left = {0} Top = {1}", TextBox1->Left, TextBox1->Top );
   }

};

public ref class LayoutForm: public System::Windows::Forms::Form
{
public:
   LayoutForm()
      : Form()
   {
      InitializeComponent();
   }


public private:
   System::Windows::Forms::Button^ Button1;
   System::Windows::Forms::Button^ Button2;
   LayoutControl^ LayoutControl1;
   System::Windows::Forms::Button^ Button3;

private:
   void InitializeComponent()
   {
      this->Button1 = gcnew System::Windows::Forms::Button;
      this->Button2 = gcnew System::Windows::Forms::Button;
      this->Button3 = gcnew System::Windows::Forms::Button;
      this->LayoutControl1 = gcnew LayoutControl;
      this->SuspendLayout();
      this->Button1->Location = System::Drawing::Point( 16, 16 );
      this->Button1->Name = "Button1";
      this->Button1->Size = System::Drawing::Size( 120, 32 );
      this->Button1->TabIndex = 0;
      this->Button1->Text = "Center textbox on control";
      this->Button2->Location = System::Drawing::Point( 152, 16 );
      this->Button2->Name = "Button2";
      this->Button2->Size = System::Drawing::Size( 104, 32 );
      this->Button2->TabIndex = 3;
      this->Button2->Text = "Shrink user control";
      this->Button3->Location = System::Drawing::Point( 96, 232 );
      this->Button3->Name = "Button3";
      this->Button3->TabIndex = 5;
      this->Button3->Text = "Reset";
      this->LayoutControl1->BackColor = System::Drawing::SystemColors::ControlDark;
      this->LayoutControl1->Location = System::Drawing::Point( 72, 64 );
      this->LayoutControl1->Name = "LayoutControl1";
      this->LayoutControl1->Size = System::Drawing::Size( 150, 160 );
      this->LayoutControl1->TabIndex = 6;
      this->ClientSize = System::Drawing::Size( 292, 266 );
      this->Controls->Add( this->Button3 );
      this->Controls->Add( this->Button2 );
      this->Controls->Add( this->Button1 );
      this->Controls->Add( this->LayoutControl1 );
      this->Name = "Form1";
      this->Text = "Form1";
      this->ResumeLayout( false );
      this->Button1->Click += gcnew System::EventHandler( this,&LayoutForm::Button1_Click );
      this->Button2->Click += gcnew System::EventHandler( this,&LayoutForm::Button2_Click );
      this->Button3->Click += gcnew System::EventHandler( this,&LayoutForm::Button3_Click );
   }


   // This method explicitly calls raises the layout event on 
   // LayoutControl1, changing the Bounds property.
   void Button1_Click( System::Object^ /*sender*/, System::EventArgs^ /*e*/ )
   {
      LayoutControl1->PerformLayout( LayoutControl1, "Bounds" );
   }


   // This resize of LayoutControl1 implicitly triggers the layout event. 
   //  Changing the size of the control affects its Bounds property.
   void Button2_Click( System::Object^ /*sender*/, System::EventArgs^ /*e*/ )
   {
      LayoutControl1->Size = System::Drawing::Size( 100, 100 );
   }


   // This method explicitly calls PerformLayout with no parameters, 
   // which raises the Layout event with the LayoutEventArgs properties
   // equal to Nothing.
   void Button3_Click( System::Object^ /*sender*/, System::EventArgs^ /*e*/ )
   {
      LayoutControl1->PerformLayout();
   }

};


[System::STAThread]
int main()
{
   Application::Run( gcnew LayoutForm );
}


using System.Windows.Forms;
using System.Drawing;

public class LayoutForm:
    System.Windows.Forms.Form

{
    public LayoutForm() : base()
    {        
        InitializeComponent();
    }

    internal System.Windows.Forms.Button Button1;
    internal System.Windows.Forms.Button Button2;
    internal LayoutControl LayoutControl1;
    internal System.Windows.Forms.Button Button3;

    private void InitializeComponent()
    {
        this.Button1 = new System.Windows.Forms.Button();
        this.Button2 = new System.Windows.Forms.Button();
        this.Button3 = new System.Windows.Forms.Button();
        this.LayoutControl1 = new LayoutControl();
        this.SuspendLayout();
        this.Button1.Location = new System.Drawing.Point(16, 16);
        this.Button1.Name = "Button1";
        this.Button1.Size = new System.Drawing.Size(120, 32);
        this.Button1.TabIndex = 0;
        this.Button1.Text = "Center textbox on control";
        this.Button2.Location = new System.Drawing.Point(152, 16);
        this.Button2.Name = "Button2";
        this.Button2.Size = new System.Drawing.Size(104, 32);
        this.Button2.TabIndex = 3;
        this.Button2.Text = "Shrink user control";
        this.Button3.Location = new System.Drawing.Point(96, 232);
        this.Button3.Name = "Button3";
        this.Button3.TabIndex = 5;
        this.Button3.Text = "Reset";
        this.LayoutControl1.BackColor = System.Drawing.SystemColors.ControlDark;
        this.LayoutControl1.Location = new System.Drawing.Point(72, 64);
        this.LayoutControl1.Name = "LayoutControl1";
        this.LayoutControl1.Size = new System.Drawing.Size(150, 160);
        this.LayoutControl1.TabIndex = 6;
        this.ClientSize = new System.Drawing.Size(292, 266);
        this.Controls.Add(this.Button3);
        this.Controls.Add(this.Button2);
        this.Controls.Add(this.Button1);
        this.Controls.Add(this.LayoutControl1);
        this.Name = "Form1";
        this.Text = "Form1";
        this.ResumeLayout(false);
        this.Button1.Click += new System.EventHandler(Button1_Click);
        this.Button2.Click += new System.EventHandler(Button2_Click);
        this.Button3.Click += new System.EventHandler(Button3_Click);
    }

    [System.STAThread]
    public static void Main()
    {
        Application.Run(new LayoutForm());
    }

    // This method explicitly calls raises the layout event on 
    // LayoutControl1, changing the Bounds property.
    private void Button1_Click(System.Object sender, System.EventArgs e)
    {
        LayoutControl1.PerformLayout(LayoutControl1, "Bounds");
    }

    // This resize of LayoutControl1 implicitly triggers the layout event. 
    //  Changing the size of the control affects its Bounds property.
    private void Button2_Click(System.Object sender, System.EventArgs e)
    {
        LayoutControl1.Size = new System.Drawing.Size(100, 100);
    }

    // This method explicitly calls PerformLayout with no parameters, 
    // which raises the Layout event with the LayoutEventArgs properties
    // equal to Nothing.
    private void Button3_Click(System.Object sender, System.EventArgs e)
    {
        LayoutControl1.PerformLayout();
    }
}

// This custom control has the Layout event implented so that when 
// PerformLayout(AffectedControl, AffectedProperty) is called 
// on the control, where AffectedProperty equals "Bounds" the 
// textbox is centered on the control.
public class LayoutControl:
    System.Windows.Forms.UserControl
{
    internal System.Windows.Forms.TextBox TextBox1;

    public LayoutControl() : base()
    {        
        InitializeComponent();
    }

    private void InitializeComponent()
    {
        this.TextBox1 = new System.Windows.Forms.TextBox();
        this.SuspendLayout();
        this.TextBox1.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
        this.TextBox1.Name = "TextBox1";
        this.TextBox1.TabIndex = 0;
        this.BackColor = System.Drawing.SystemColors.ControlDark;
        this.Controls.Add(this.TextBox1);
        this.Name = "LayoutControl";
        this.ResumeLayout(false);
        this.Layout += new LayoutEventHandler(LayoutControl_Layout);
    }

    // This method is called when the Layout event is fired. 
    // This happens by during the initial load, by calling PerformLayout
    // or by resizing, adding or removing controls or other actions that 
    // affect how the control is laid out. This method checks the 
    // value of e.AffectedProperty and changes the look of the 
    // control accordingly. 
    private void LayoutControl_Layout(object sender, 
        System.Windows.Forms.LayoutEventArgs e)
    {
        if (e.AffectedProperty != null)
        {
            if (e.AffectedProperty.Equals("Bounds"))
            {
                TextBox1.Left = (this.Width-TextBox1.Width)/2;
                TextBox1.Top = (this.Height-TextBox1.Height)/2;
            }
        }
        else
        {
            this.Size = new System.Drawing.Size(150, 160);
            TextBox1.Location = new System.Drawing.Point(16, 24);
        }
        TextBox1.Text = "Left = "+TextBox1.Left+" Top = "+TextBox1.Top;
    }
}


Imports System.Windows.Forms
Imports System.Drawing



Public Class LayoutForm
    Inherits System.Windows.Forms.Form

    Public Sub New()
        MyBase.New()
        InitializeComponent()
    End Sub

    Friend WithEvents Button1 As System.Windows.Forms.Button
    Friend WithEvents Button2 As System.Windows.Forms.Button
    Friend WithEvents LayoutControl1 As LayoutControl
    Friend WithEvents Button3 As System.Windows.Forms.Button

    Private Sub InitializeComponent()
        Me.Button1 = New System.Windows.Forms.Button
        Me.Button2 = New System.Windows.Forms.Button
        Me.Button3 = New System.Windows.Forms.Button
        Me.LayoutControl1 = New LayoutControl
        Me.SuspendLayout()
        Me.Button1.Location = New System.Drawing.Point(16, 16)
        Me.Button1.Name = "Button1"
        Me.Button1.Size = New System.Drawing.Size(120, 32)
        Me.Button1.TabIndex = 0
        Me.Button1.Text = "Center textbox on control"
        Me.Button2.Location = New System.Drawing.Point(152, 16)
        Me.Button2.Name = "Button2"
        Me.Button2.Size = New System.Drawing.Size(104, 32)
        Me.Button2.TabIndex = 3
        Me.Button2.Text = "Shrink user control"
        Me.Button3.Location = New System.Drawing.Point(96, 232)
        Me.Button3.Name = "Button3"
        Me.Button3.TabIndex = 5
        Me.Button3.Text = "Reset"
        Me.LayoutControl1.BackColor = System.Drawing.SystemColors.ControlDark
        Me.LayoutControl1.Location = New System.Drawing.Point(72, 64)
        Me.LayoutControl1.Name = "LayoutControl1"
        Me.LayoutControl1.Size = New System.Drawing.Size(150, 160)
        Me.LayoutControl1.TabIndex = 6
        Me.ClientSize = New System.Drawing.Size(292, 266)
        Me.Controls.Add(Me.Button3)
        Me.Controls.Add(Me.Button2)
        Me.Controls.Add(Me.Button1)
        Me.Controls.Add(Me.LayoutControl1)
        Me.Name = "Form1"
        Me.Text = "Form1"
        Me.ResumeLayout(False)

    End Sub

    <System.STAThread()> Shared Sub Main()
        Application.Run(New LayoutForm)
    End Sub


   
    ' This method explicitly calls raises the layout event on 
    ' LayoutControl1, changing the Bounds property.
    Private Sub Button1_Click(ByVal sender As System.Object, _
        ByVal e As System.EventArgs) Handles Button1.Click
        LayoutControl1.PerformLayout(LayoutControl1, "Bounds")
    End Sub

    ' This resize of LayoutControl1 implicitly triggers the layout event. 
    '   Changing the size of the control affects its Bounds property.
    Private Sub Button2_Click(ByVal sender As System.Object, _
        ByVal e As System.EventArgs) Handles Button2.Click
        LayoutControl1.Size = New System.Drawing.Size(100, 100)
    End Sub

    ' This method explicitly calls PerformLayout with no parameters, 
    ' which raises the Layout event with the LayoutEventArgs properties
    ' equal to Nothing.
    Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
        LayoutControl1.PerformLayout()
    End Sub

End Class


'This custom control has the Layout event implented so that when 
'PerformLayout(AffectedControl, AffectedProperty) is called on the control, 
'where AffectedProperty equals "Bounds" the textbox is centered on the control.
Public Class LayoutControl
    Inherits System.Windows.Forms.UserControl
    Friend WithEvents TextBox1 As System.Windows.Forms.TextBox

    Public Sub New()
        MyBase.New()
        InitializeComponent()
    End Sub

    Private Sub InitializeComponent()
        Me.TextBox1 = New System.Windows.Forms.TextBox
        Me.SuspendLayout()
        Me.TextBox1.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle
        Me.TextBox1.Name = "TextBox1"
        Me.TextBox1.TabIndex = 0
        Me.BackColor = System.Drawing.SystemColors.ControlDark
        Me.Controls.Add(Me.TextBox1)
        Me.Name = "LayoutControl"
        Me.ResumeLayout(False)

    End Sub

    'This method is called when the Layout event is fired. This happens by during the initial load,
    'by calling PerformLayout or by resizing, adding or removing controls or other actions that 
    'affect how the control is laid out. This method checks the value of e.AffectedProperty
    'and changes the look of the control accordingly. 
    Private Sub LayoutControl_Layout(ByVal sender As Object, ByVal e As System.Windows.Forms.LayoutEventArgs) Handles MyBase.Layout
        If e.AffectedProperty IsNot Nothing Then
            If e.AffectedProperty.Equals("Bounds") Then
                TextBox1.Left = (Me.Width - TextBox1.Width) / 2
                TextBox1.Top = (Me.Height - TextBox1.Height) / 2
            End If
        Else
            Me.Size = New System.Drawing.Size(150, 160)
            TextBox1.Location = New System.Drawing.Point(16, 24)
        End If
        TextBox1.Text = "Left = " & TextBox1.Left & " Top = " & TextBox1.Top
    End Sub

End Class

Remarks

If the SuspendLayout method was called before calling the PerformLayout method, the Layout event is suppressed.

The AffectedControl and AffectedProperty properties of the LayoutEventArgs created are set to null if no values were provided when the PerformLayout method was called.

Applies to

Partajați prin

Control.PerformLayout Method

Definition

Overloads

PerformLayout(Control, String)

Parameters

Examples

Remarks

See also

Applies to

PerformLayout()

Examples

Remarks

See also

Applies to

Resurse suplimentare