ScrollItemPattern.ScrollIntoView Método

Definição

Namespace:

System.Windows.Automation

Assembly:

UIAutomationClient.dll

Rola a área de conteúdo de um objeto contêiner para exibir o AutomationElement dentro da região visível (visor) do contêiner.

public:
 void ScrollIntoView();

public void ScrollIntoView ();

member this.ScrollIntoView : unit -> unit

Public Sub ScrollIntoView ()

Exceções

InvalidOperationException

O item não pode ser rolado para a exibição.

Exemplos

No exemplo a seguir, um manipulador de eventos ou RemoveFromSelection um SelectAddToSelection manipulador de eventos foi declarado que tenta rolar um SelectionItemPattern objeto para a região viewl de seu controle de contêiner.

///--------------------------------------------------------------------
/// <summary>
/// Obtains a ScrollItemPattern control pattern from an 
/// automation element.
/// </summary>
/// <param name="targetControl">
/// The automation element of interest.
/// </param>
/// <returns>
/// A ScrollItemPattern object.
/// </returns>
///--------------------------------------------------------------------
private ScrollItemPattern GetScrollItemPattern(
    AutomationElement targetControl)
{
    ScrollItemPattern scrollItemPattern = null;

    try
    {
        scrollItemPattern =
            targetControl.GetCurrentPattern(
            ScrollItemPattern.Pattern)
            as ScrollItemPattern;
    }
    // Object doesn't support the ScrollItemPattern control pattern
    catch (InvalidOperationException)
    {
        return null;
    }

    return scrollItemPattern;
}

'''--------------------------------------------------------------------
''' <summary>
''' Obtains a ScrollItemPattern control pattern from an 
''' automation element.
''' </summary>
''' <param name="targetControl">
''' The automation element of interest.
''' </param>
''' <returns>
''' A ScrollItemPattern object.
''' </returns>
'''--------------------------------------------------------------------
Private Function GetScrollItemPattern( _
ByVal targetControl As AutomationElement) As ScrollItemPattern
    Dim scrollItemPattern As ScrollItemPattern = Nothing

    Try
        scrollItemPattern = DirectCast( _
        targetControl.GetCurrentPattern( _
        scrollItemPattern.Pattern), ScrollItemPattern)
    Catch
        ' Object doesn't support the ScrollItemPattern control pattern
        Return Nothing
    End Try

    Return scrollItemPattern

End Function 'GetScrollItemPattern

///--------------------------------------------------------------------
/// <summary>
/// A Select, AddToSelection or RemoveFromSelection event handler that 
/// scrolls a SelectionItem object into the viewable region of its 
/// container control.
/// </summary>
///--------------------------------------------------------------------
private void OnSelectionItemSelect(
    object src, SelectionChangedEventArgs e)
{
    AutomationElement selectionItem = src as AutomationElement;

    ScrollItemPattern scrollItemPattern = GetScrollItemPattern(selectionItem);

    if (scrollItemPattern == null)
    {
        return;
    }

    try
    {
        scrollItemPattern.ScrollIntoView();
    }
    catch (InvalidOperationException)
    {
        // The item cannot be scrolled into view.
        // TO DO: error handling.
    }
}

'''--------------------------------------------------------------------
''' <summary>
''' A Select, AddToSelection or RemoveFromSelection event handler that 
''' scrolls a SelectionItem object into the viewable region of its 
''' container control.
''' </summary>
'''--------------------------------------------------------------------
Private Sub OnSelectionItemSelect( _
ByVal src As Object, ByVal e As SelectionChangedEventArgs)
    Dim selectionItem As AutomationElement = _
    DirectCast(src, AutomationElement)

    Dim scrollItemPattern As ScrollItemPattern = _
    GetScrollItemPattern(selectionItem)

    If scrollItemPattern Is Nothing Then
        Return
    End If

    Try
        scrollItemPattern.ScrollIntoView()
    Catch exc As InvalidOperationException
        ' The item cannot be scrolled into view.
        ' TO DO: error handling.
    End Try

End Sub

Comentários

Esse método não fornece a capacidade de especificar a posição da AutomationElement região visível (visor) do contêiner.