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LayoutEventHandler Delegate

Represents the method that will handle the Layout event of a Control.

Namespace: System.Windows.Forms
Assembly: System.Windows.Forms (in system.windows.forms.dll)

public delegate void LayoutEventHandler (
	Object sender,
	LayoutEventArgs e
)
/** @delegate */
public delegate void LayoutEventHandler (
	Object sender, 
	LayoutEventArgs e
)
Not applicable.

Parameters

sender

The source of the event.

e

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 : System.Windows.Forms.Form
{
   private System.Windows.Forms.TextBox textBox1;
   private System.Windows.Forms.Label label1;
   private System.Windows.Forms.Button layoutButton;
   private System.ComponentModel.Container components = null;

   public Form1()
   {
      InitializeComponent();
   }

   protected override void Dispose( bool disposing )
   {
      if( disposing )
      {
         if (components != null) 
         {
            components.Dispose();
         }
      }
      base.Dispose( disposing );
   }

   private void InitializeComponent()
   {
      this.layoutButton = new System.Windows.Forms.Button();
      this.textBox1 = new System.Windows.Forms.TextBox();
      this.label1 = new System.Windows.Forms.Label();
      this.SuspendLayout();
      // 
      // layoutButton
      // 
      this.layoutButton.Anchor = System.Windows.Forms.AnchorStyles.Bottom;
      this.layoutButton.Location = new System.Drawing.Point(72, 88);
      this.layoutButton.Name = "layoutButton";
      this.layoutButton.Size = new System.Drawing.Size(150, 23);
      this.layoutButton.TabIndex = 0;
      this.layoutButton.Text = "Hello";
      // 
      // textBox1
      // 
      this.textBox1.Anchor = ((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Left) 
         | System.Windows.Forms.AnchorStyles.Right);
      this.textBox1.Location = new System.Drawing.Point(24, 40);
      this.textBox1.Name = "textBox1";
      this.textBox1.Size = new System.Drawing.Size(248, 20);
      this.textBox1.TabIndex = 1;
      this.textBox1.Text = "Hello";
      this.textBox1.TextChanged += new System.EventHandler(this.textBox1_TextChanged);
      // 
      // label1
      // 
      this.label1.Location = new System.Drawing.Point(24, 16);
      this.label1.Name = "label1";
      this.label1.TabIndex = 2;
      this.label1.Text = "Button\'s Text:";
      // 
      // Form1
      // 
      this.ClientSize = new System.Drawing.Size(292, 129);
      this.Controls.AddRange(new System.Windows.Forms.Control[] {
                                                                   this.label1,
                                                                   this.textBox1,
                                                                   this.layoutButton});
      this.Name = "Form1";
      this.Text = "Layout Sample";
      this.Layout += new System.Windows.Forms.LayoutEventHandler(this.Form1_Layout);
      this.ResumeLayout(false);

   }

   [STAThread]
   static void Main() 
   {
      Application.Run(new Form1());
   }
   
   // 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 void Form1_Layout(object sender, System.Windows.Forms.LayoutEventArgs e)
   {
      // 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 != null) && (e.AffectedProperty != null))
      {
         // Ensure that the affected property is the Bounds property
         // of the form.
         if (e.AffectedProperty.ToString() == "Bounds") 
         {
            // 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 ((this.layoutButton.Width + 50) > 300) 
            {
               this.Width = this.layoutButton.Width + 50;
            }
               // If not, keep the form's width at 300 pixels.
            else 
            {
               this.Width = 300;
            }

            // Center layoutButton on the form.
            this.layoutButton.Left = (this.ClientSize.Width - this.layoutButton.Width) / 2;
         }
      }
   }

   // 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 void textBox1_TextChanged(object sender, System.EventArgs e)
   {
      // Set the Text property of layoutButton.
      this.layoutButton.Text = this.textBox1.Text;
      // Get the width of the text using the proper font.
      int textWidth = (int)this.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)
      {
         // Setting the size property on any control raises 
         // the Layout event for its container.
         this.layoutButton.Width = textWidth + 20;
      }
         // If not, keep layoutButton's width at 150 pixels.
      else 
      {
         this.layoutButton.Width = 150;
      }
   }
}

public class Form1 extends System.Windows.Forms.Form
{
    private System.Windows.Forms.TextBox textBox1;
    private System.Windows.Forms.Label label1;
    private System.Windows.Forms.Button layoutButton;
    private System.ComponentModel.Container components = null;

    public Form1()
    {
        InitializeComponent();
    } //Form1

    protected void Dispose(boolean disposing)
    {
        if (disposing) {
            if (components != null) {
                components.Dispose();
            }
        }
        super.Dispose(disposing);
    } //Dispose

    private void InitializeComponent()
    {
        this.layoutButton = new System.Windows.Forms.Button();
        this.textBox1 = new System.Windows.Forms.TextBox();
        this.label1 = new System.Windows.Forms.Label();
        this.SuspendLayout();
        //
        // layoutButton
        //
        this.layoutButton.set_Anchor(System.Windows.Forms.AnchorStyles.Bottom);
        this.layoutButton.set_Location(new System.Drawing.Point(72, 88));
        this.layoutButton.set_Name("layoutButton");
        this.layoutButton.set_Size(new System.Drawing.Size(150, 23));
        this.layoutButton.set_TabIndex(0);
        this.layoutButton.set_Text("Hello");
        //
        // textBox1
        //
        this.textBox1.set_Anchor(System.Windows.Forms.AnchorStyles.Top 
            | System.Windows.Forms.AnchorStyles.Left | System.Windows.Forms.
            AnchorStyles.Right);
        this.textBox1.set_Location(new System.Drawing.Point(24, 40));
        this.textBox1.set_Name("textBox1");
        this.textBox1.set_Size(new System.Drawing.Size(248, 20));
        this.textBox1.set_TabIndex(1);
        this.textBox1.set_Text("Hello");
        this.textBox1.add_TextChanged(new System.EventHandler(this.
            textBox1_TextChanged));
        //
        // label1
        //
        this.label1.set_Location(new System.Drawing.Point(24, 16));
        this.label1.set_Name("label1");
        this.label1.set_TabIndex(2);
        this.label1.set_Text("Button\'s Text:");
        //
        // Form1
        //
        this.set_ClientSize(new System.Drawing.Size(292, 129));
        this.get_Controls().AddRange(new System.Windows.Forms.Control[] { this.
            label1, this.textBox1, this.layoutButton });
        this.set_Name("Form1");
        this.set_Text("Layout Sample");
        this.add_Layout(new System.Windows.Forms.LayoutEventHandler(this.
            Form1_Layout));
        this.ResumeLayout(false);
    } //InitializeComponent

    /** @attribute STAThread()
     */
    public static void main(String[] args)
    {
        Application.Run(new Form1());
    } //main

   // 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 void Form1_Layout(Object sender,
        System.Windows.Forms.LayoutEventArgs e)
    {
      // 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.get_AffectedControl() != null 
            && e.get_AffectedProperty() != null) {
            // Ensure that the affected property is the Bounds property
            // of the form.
            if ((e.get_AffectedProperty().ToString()).Equals("Bounds")) {
            // 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 (this.layoutButton.get_Width() + 50 > 300) {
                    this.set_Width(this.layoutButton.get_Width() + 50);
                }
                    // If not, keep the form's width at 300 pixels.
                else {
                    this.set_Width(300);
                }

                // Center layoutButton on the form.
                this.layoutButton.set_Left((this.get_ClientSize().get_Width() 
                    - this.layoutButton.get_Width()) / 2);
            }
        }
    } //Form1_Layout

    // 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 void textBox1_TextChanged(Object sender, System.EventArgs e)
    {
        // Set the Text property of layoutButton.
        this.layoutButton.set_Text(this.textBox1.get_Text());
        // Get the width of the text using the proper font.
        int textWidth = (int)(this.CreateGraphics().MeasureString(layoutButton.
            get_Text(), layoutButton.get_Font()).get_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){
            // Setting the size property on any control raises 
            // the Layout event for its container.
            this.layoutButton.set_Width(textWidth + 20);
        }
            // If not, keep layoutButton's width at 150 pixels.
        else{
            this.layoutButton.set_Width(150);
        }
    } //textBox1_TextChanged
} //Form1

Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0

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