Control.SizeChanged Event

Reference

Definition

Namespace:: System.Windows.Forms

Assembly:: System.Windows.Forms.dll

Important

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Occurs when the Size property value changes.

public:
 event EventHandler ^ SizeChanged;

public event EventHandler SizeChanged;

public event EventHandler? SizeChanged;

member this.SizeChanged : EventHandler

Public Custom Event SizeChanged As EventHandler

Event Type

EventHandler

Examples

The following code example demonstrates the SizeChanged event. An instance of a Button control has been provided that can be scaled both horizontally and vertically. A NumericUpDown instance provides the horizontal and vertical scale value. The Button instance named OK is used to set the scale values for the Button control instance. Whenever the size of the control changes, the event handler associated with the SizeChanged event of the control is called. This event handler displays a message box indicating that the size of the control has changed.

private:
   void RegisterEventHandler()
   {
      myButton1->SizeChanged += gcnew EventHandler( this, &MyForm::MyButton1_SizeChanged );
   }

   void MyButton2_Click( Object^ /*sender*/, System::EventArgs^ /*e*/ )
   {
      // Set the scale for the control to the value provided.
      float scale = (float)myNumericUpDown1->Value;
      myButton1->Scale( scale );
   }

   void MyButton1_SizeChanged( Object^ /*sender*/, System::EventArgs^ /*e*/ )
   {
      MessageBox::Show( "The size of the 'Button' control has changed" );
   }

private void RegisterEventHandler()
{
   myButton1.SizeChanged += new EventHandler(this.MyButton1_SizeChanged);
}

private void MyButton2_Click(object sender, System.EventArgs e)
{
   // Set the scale for the control to the value provided.
   float scale = (float)myNumericUpDown1.Value;
   myButton1.Scale(scale);
}

private void MyButton1_SizeChanged(object sender, System.EventArgs e)
{
   MessageBox.Show("The size of the 'Button' control has changed");
}

Private Sub RegisterEventHandler()
   AddHandler myButton1.SizeChanged, AddressOf MyButton1_SizeChanged
End Sub

Private Sub MyButton2_Click(sender As Object, e As EventArgs) 
   ' Set the scale for the control to the value provided.
   Dim scale As Single = CSng(myNumericUpDown1.Value)
   myButton1.Scale(scale)
End Sub

Private Sub MyButton1_SizeChanged(sender As Object, e As EventArgs)
   MessageBox.Show("The size of the 'Button' control has changed")
End Sub

Remarks

It is preferable to use the Layout event to handle custom layouts. The Layout event is raised in response to Resize events, but also in other conditions when layout might need to be applied.

This event is raised if the Size property is changed by either a programmatic modification or user interaction.

For more information about handling events, see Handling and Raising Events.

Applies to

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