WindowPattern.WindowPatternInformation.IsTopmost Eigenschaft

Definition

Namespace:

System.Windows.Automation

Assembly:

UIAutomationClient.dll

Ruft einen Wert ab, der angibt, ob das AutomationElement das oberste Element in der Z-Reihenfolge ist.

public:
 property bool IsTopmost { bool get(); };

public bool IsTopmost { get; }

member this.IsTopmost : bool

Public ReadOnly Property IsTopmost As Boolean

Eigenschaftswert

Boolean

true, wenn das AutomationElement das oberste ist, andernfalls false.

Beispiele

Im folgenden Beispiel wird eine AutomationPropertyChangedEventHandler definiert, um auf Änderungen an einer IsTopmostPropertyAutomationElementzu lauschen.

///--------------------------------------------------------------------
/// <summary>
/// Register for automation property change events of interest.
/// </summary>
/// <param name="targetControl">
/// The automation element of interest.
/// </param>
///--------------------------------------------------------------------
private void RegisterForPropertyChangedEvents(
    AutomationElement targetControl)
{
    AutomationPropertyChangedEventHandler propertyChangeListener = 
        new AutomationPropertyChangedEventHandler(
        OnTopmostPropertyChange);
    Automation.AddAutomationPropertyChangedEventHandler(
        targetControl, 
        TreeScope.Element, 
        propertyChangeListener, 
        WindowPattern.IsTopmostProperty);
}

'''--------------------------------------------------------------------
''' <summary>
''' Register for automation property change events of interest.
''' </summary>
''' <param name="targetControl">
''' The automation element of interest.
''' </param>
'''--------------------------------------------------------------------
Private Sub RegisterForPropertyChangedEvents( _
ByVal targetControl As AutomationElement)
    Dim propertyChangeListener As AutomationPropertyChangedEventHandler = _
        New AutomationPropertyChangedEventHandler(AddressOf _
        OnTopmostPropertyChange)
    Automation.AddAutomationPropertyChangedEventHandler( _
        targetControl, _
        TreeScope.Element, _
        propertyChangeListener, _
        WindowPattern.IsTopmostProperty)
End Sub

///--------------------------------------------------------------------
/// <summary>
/// Register for automation property change events of interest.
/// </summary>
/// <param name="src">Object that raised the event.</param>
/// <param name="e">Event arguments.</param>
///--------------------------------------------------------------------
private void OnTopmostPropertyChange(object src, AutomationPropertyChangedEventArgs e)
{
    // Make sure the element still exists. Elements such as tooltips
    // can disappear before the event is processed.
    AutomationElement sourceElement;
    try
    {
        sourceElement = src as AutomationElement;
    }
    catch (ElementNotAvailableException)
    {
        return;
    }
    
    // Get a WindowPattern from the source of the event.
    WindowPattern windowPattern = GetWindowPattern(sourceElement);
    if (windowPattern.Current.IsTopmost)
    {
        //TODO: event handling
    }
}

'''--------------------------------------------------------------------
''' <summary>
''' Register for automation property change events of interest.
''' </summary>
''' <param name="src">Object that raised the event.</param>
''' <param name="e">Event arguments.</param>
'''--------------------------------------------------------------------
Private Sub OnTopmostPropertyChange(ByVal src As Object, _
ByVal e As AutomationPropertyChangedEventArgs)
    ' Make sure the element still exists. Elements such as tooltips
    ' can disappear before the event is processed.
    Dim sourceElement As AutomationElement
    Try
        sourceElement = DirectCast(src, AutomationElement)
    Catch exc As ElementNotAvailableException
        Return
    End Try
    ' Get a WindowPattern from the source of the event.
    Dim windowPattern As WindowPattern = GetWindowPattern(sourceElement)
    If (WindowPattern.Current.IsTopmost) Then
        'TODO: event handling
    End If
End Sub