Control.Visible Property

Definition

Obtém ou define um valor que indica se o controle e todos os seus controles filho são exibidos.Gets or sets a value indicating whether the control and all its child controls are displayed.

public:
 property bool Visible { bool get(); void set(bool value); };
public bool Visible { get; set; }
member this.Visible : bool with get, set
Public Property Visible As Boolean

Property Value

Boolean

true se o controle e todos os seus controles filho forem exibidos; caso contrário, false.true if the control and all its child controls are displayed; otherwise, false. O padrão é true.The default is true.

Examples

O exemplo de código a seguir usa as classes derivadas VScrollBar e HScrollBar e define seus valores de propriedade Visible, com base no tamanho de um Image sendo exibido em um controle de PictureBox.The following code example uses the derived classes VScrollBar and HScrollBar and sets their Visible property values, based on the size of an Image being displayed in a PictureBox control. Este exemplo requer que um PictureBox tenha sido criado em um formulário e que HScrollBar e os controles de VScrollBar tenham sido criados no PictureBox.This example requires that a PictureBox has been created on a form and that HScrollBar and VScrollBar controls have been created on the PictureBox. Esse código deve ser chamado quando a imagem é carregada na caixa de imagem e pelo evento Resize do formulário.This code should be called when the image is loaded into the picture box and by the Resize event of the form.

public:
   void DisplayScrollBars()
   {
      // Display or hide the scroll bars based upon  
      // whether the image is larger than the PictureBox.
      if ( pictureBox1->Width > pictureBox1->Image->Width )
      {
         hScrollBar1->Visible = false;
      }
      else
      {
         hScrollBar1->Visible = true;
      }

      if ( pictureBox1->Height > pictureBox1->Image->Height )
      {
         vScrollBar1->Visible = false;
      }
      else
      {
         vScrollBar1->Visible = true;
      }
   }
public void DisplayScrollBars()
 {
    // Display or hide the scroll bars based upon  
    // whether the image is larger than the PictureBox.
    if (pictureBox1.Width > pictureBox1.Image.Width)
    {
       hScrollBar1.Visible = false;
    }
    else
    {
       hScrollBar1.Visible = true;
    }
    
    if (pictureBox1.Height > pictureBox1.Image.Height)
    {
       vScrollBar1.Visible = false;
    }
    else
    {
       vScrollBar1.Visible = true;
    }
 }
 
Public Sub DisplayScrollBars()
    ' Display or hide the scroll bars based upon  
    ' whether the image is larger than the PictureBox.
    If pictureBox1.Width > pictureBox1.Image.Width Then
        hScrollBar1.Visible = False
    Else
        hScrollBar1.Visible = True
    End If
    
    If pictureBox1.Height > pictureBox1.Image.Height Then
        vScrollBar1.Visible = False
    Else
        vScrollBar1.Visible = True
    End If
End Sub

Remarks

Observe que, mesmo se Visible estiver definido como true, o controle poderá não ser visível para o usuário se ele estiver obscurecido por trás de outros controles.Note that even if Visible is set to true, the control might not be visible to the user if it is obscured behind other controls.

Applies to

See also