ScrollItemPattern.ScrollIntoView Methode

public:
 void ScrollIntoView();

public void ScrollIntoView();

member this.ScrollIntoView : unit -> unit

Public Sub ScrollIntoView ()

Uitzonderingen

Voorbeelden

In het volgende voorbeeld is een Selectof AddToSelectionRemoveFromSelection meer gebeurtenishandlers gedeclareerd die probeert een SelectionItemPattern object naar het zichtbaar gebied van het containerbeheer te schuiven.

///--------------------------------------------------------------------
/// <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

Opmerkingen

Deze methode biedt niet de mogelijkheid om de positie op te geven van de positie van de AutomationElement zichtbare regio (viewport) van de container.