ScrollPattern.ScrollPatternInformation.VerticallyScrollable Proprietà

Definizione

Recupera un valore che indica se l'elemento di automazione interfaccia utente può scorrere in verticale.Retrieves a value that indicates whether the UI Automation element can scroll vertically.

public:
 property bool VerticallyScrollable { bool get(); };
public bool VerticallyScrollable { get; }
member this.VerticallyScrollable : bool
Public ReadOnly Property VerticallyScrollable As Boolean

Valore della proprietà

true se l'elemento di automazione interfaccia utente può scorrere orizzontalmente. In caso contrario, false.true if the UI Automation element can scroll horizontally; otherwise false. Il valore predefinito è false.The default value is false.

Esempi

Nell'esempio seguente viene ottenuto un ScrollPattern pattern di controllo da un elemento di automazione interfaccia utente, che viene quindi usato per scorrere verticalmente l'elemento della quantità richiesta.In the following example, a ScrollPattern control pattern is obtained from a UI Automation element and is then used to vertically scroll the element the requested amount.

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

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

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

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

    Return scrollPattern

End Function 'GetScrollPattern
///--------------------------------------------------------------------
/// <summary>
/// Obtains a ScrollPattern control pattern from an automation 
/// element and attempts to horizontally scroll the requested amount.
/// </summary>
/// <param name="targetControl">
/// The automation element of interest.
/// </param>
/// <param name="vScrollAmount">
/// The requested vertical scroll amount.
/// </param>
///--------------------------------------------------------------------
private void ScrollElementVertically(
    AutomationElement targetControl,
    ScrollAmount vScrollAmount)
{
    if (targetControl == null)
    {
        throw new ArgumentNullException(
            "AutomationElement argument cannot be null.");
    }

    ScrollPattern scrollPattern = GetScrollPattern(targetControl);

    if (scrollPattern == null)
    {
        return;
    }
    
    if (!scrollPattern.Current.VerticallyScrollable)
    {
        return;
    }

    try
    {
        scrollPattern.ScrollVertical(vScrollAmount);
    }
    catch (InvalidOperationException)
    {
        // Control not able to scroll in the direction requested;
        // when scrollable property of that direction is False
        // TO DO: error handling.
    }
    catch (ArgumentException)
    {
        // If a control supports SmallIncrement values exclusively 
        // for horizontal or vertical scrolling but a LargeIncrement 
        // value (NaN if not supported) is passed in.
        // TO DO: error handling.
    }
}
'''--------------------------------------------------------------------
''' <summary>
''' Obtains a ScrollPattern control pattern from an automation 
''' element and attempts to horizontally scroll the requested amount.
''' </summary>
''' <param name="targetControl">
''' The automation element of interest.
''' </param>
''' <param name="vScrollAmount">
''' The requested vertical scroll amount.
''' </param>
'''--------------------------------------------------------------------
Private Sub ScrollElementVertically( _
ByVal targetControl As AutomationElement, _
ByVal vScrollAmount As ScrollAmount)
    If targetControl Is Nothing Then
        Throw New ArgumentNullException( _
        "AutomationElement argument cannot be null.")
    End If

    Dim scrollPattern As ScrollPattern = GetScrollPattern(targetControl)

    If scrollPattern Is Nothing Then
        Return
    End If

    If Not scrollPattern.Current.VerticallyScrollable Then
        Return
    End If

    Try
        scrollPattern.ScrollVertical(vScrollAmount)
    Catch exc As InvalidOperationException
        ' Control not able to scroll in the direction requested;
        ' when scrollable property of that direction is False
        ' TO DO: error handling.
    Catch exc As ArgumentException
        ' If a control supports SmallIncrement values exclusively 
        ' for horizontal or vertical scrolling but a LargeIncrement 
        ' value (NaN if not supported) is passed in.
        ' TO DO: error handling.
    End Try

End Sub

Commenti

Questa proprietà può essere dinamica.This property can be dynamic. Ad esempio, l'area del contenuto dell'elemento di automazione interfaccia utente potrebbe non essere più grande dell'area visualizzabile VerticallyScrollable corrente false, ovvero.For example, the content area of the UI Automation element might not be larger than the current viewable area, meaning VerticallyScrollable is false. Tuttavia, il ridimensionamento Automazione interfaccia utenteUI Automation dell'elemento o l'aggiunta di elementi figlio può aumentare i limiti dell'area di contenuto oltre l'area visualizzabile VerticallyScrollable , truea indicare che è.However, resizing the Automazione interfaccia utenteUI Automation element or adding child items can increase the bounds of the content area beyond the viewable area, indicating that VerticallyScrollable is true.

Si applica a