Control.Region Propriedade

Definição

Obtém ou define a região da janela associada ao controle.Gets or sets the window region associated with the control.

public:
 property System::Drawing::Region ^ Region { System::Drawing::Region ^ get(); void set(System::Drawing::Region ^ value); };
[System.ComponentModel.Browsable(false)]
public System.Drawing.Region Region { get; set; }
member this.Region : System.Drawing.Region with get, set
Public Property Region As Region

Valor da propriedade

Region

A janela Region associada ao controle.The window Region associated with the control.

Atributos

Exemplos

O exemplo de código a seguir demonstra como usar a propriedade Region criando um botão redondo.The following code example demonstrates how to use the Region property by creating a round button. Para executar o exemplo, Cole o código a seguir em um formulário que contém um botão chamado roundButton.To run the example, paste the following code in a form containing a button called roundButton. Este exemplo requer que o evento Paint esteja conectado ao manipulador de eventos definido no exemplo.This example requires that the Paint event is connected to the event handler defined in the example.

private:
   // This method will change the square button to a circular button by 
   // creating a new circle-shaped GraphicsPath object and setting it 
   // to the RoundButton objects region.
   void roundButton_Paint( Object^ sender,
      System::Windows::Forms::PaintEventArgs^ e )
   {
      System::Drawing::Drawing2D::GraphicsPath^ buttonPath =
         gcnew System::Drawing::Drawing2D::GraphicsPath;
      
      // Set a new rectangle to the same size as the button's 
      // ClientRectangle property.
      System::Drawing::Rectangle newRectangle = roundButton->ClientRectangle;
      
      // Decrease the size of the rectangle.
      newRectangle.Inflate(  -10, -10 );
      
      // Draw the button's border.
      e->Graphics->DrawEllipse( System::Drawing::Pens::Black, newRectangle );
      
      // Increase the size of the rectangle to include the border.
      newRectangle.Inflate( 1, 1 );
      
      // Create a circle within the new rectangle.
      buttonPath->AddEllipse( newRectangle );
      
      // Set the button's Region property to the newly created 
      // circle region.
      roundButton->Region = gcnew System::Drawing::Region( buttonPath );
   }
// This method will change the square button to a circular button by 
// creating a new circle-shaped GraphicsPath object and setting it 
// to the RoundButton objects region.
private void roundButton_Paint(object sender, 
    System.Windows.Forms.PaintEventArgs e)
{

    System.Drawing.Drawing2D.GraphicsPath buttonPath = 
        new System.Drawing.Drawing2D.GraphicsPath();

    // Set a new rectangle to the same size as the button's 
    // ClientRectangle property.
    System.Drawing.Rectangle newRectangle = roundButton.ClientRectangle;

    // Decrease the size of the rectangle.
    newRectangle.Inflate(-10, -10);
    
    // Draw the button's border.
    e.Graphics.DrawEllipse(System.Drawing.Pens.Black, newRectangle);

    // Increase the size of the rectangle to include the border.
    newRectangle.Inflate( 1,  1);

    // Create a circle within the new rectangle.
    buttonPath.AddEllipse(newRectangle);
            
    // Set the button's Region property to the newly created 
    // circle region.
    roundButton.Region = new System.Drawing.Region(buttonPath);
}
' This method will change the square button to a circular button by 
' creating a new circle-shaped GraphicsPath object and setting it 
' to the RoundButton objects region.
Private Sub roundButton_Paint(ByVal sender As Object, _
    ByVal e As System.Windows.Forms.PaintEventArgs) Handles roundButton.Paint

    Dim buttonPath As New System.Drawing.Drawing2D.GraphicsPath

    ' Set a new rectangle to the same size as the button's 
    ' ClientRectangle property.
    Dim newRectangle As Rectangle = roundButton.ClientRectangle

    ' Decrease the size of the rectangle.
    newRectangle.Inflate(-10, -10)

    ' Draw the button's border.
    'e.Graphics.DrawEllipse(System.Drawing.Pens.Black, newRectangle)

    'Increase the size of the rectangle to include the border.
    newRectangle.Inflate(1, 1)

    ' Create a circle within the new rectangle.
    buttonPath.AddEllipse(newRectangle)
    e.Graphics.DrawPath(Pens.Black, buttonPath)
    ' Set the button's Region property to the newly created 
    ' circle region.
    roundButton.Region = New System.Drawing.Region(buttonPath)

End Sub

Comentários

A região da janela é uma coleção de pixels dentro da janela em que o sistema operacional permite o desenho.The window region is a collection of pixels within the window where the operating system permits drawing. O sistema operacional não exibe nenhuma parte de uma janela que está fora da região da janela.The operating system does not display any portion of a window that lies outside of the window region. As coordenadas da região de um controle são relativas ao canto superior esquerdo do controle, não à área do cliente do controle.The coordinates of a control's region are relative to the upper-left corner of the control, not the client area of the control.

Observação

A coleção de pixels contidas na região pode ser não contígua.The collection of pixels contained with the region can be noncontiguous.

Aplica-se a

Veja também