TableItemPattern.TableItemPatternInformation.GetColumnHeaderItems Methode

Definition

Namespace:

System.Windows.Automation

Assembly:

UIAutomationClient.dll

Ruft alle einem Tabellenelement oder einer Zelle zugeordneten Spaltenheader ab.

public:
 cli::array <System::Windows::Automation::AutomationElement ^> ^ GetColumnHeaderItems();

public System.Windows.Automation.AutomationElement[] GetColumnHeaderItems ();

member this.GetColumnHeaderItems : unit -> System.Windows.Automation.AutomationElement[]

Public Function GetColumnHeaderItems () As AutomationElement()

Gibt zurück

AutomationElement[]

Eine Auflistung von Spaltenheaderelementen. Der Standardwert ist ein leeres Array.

Beispiele

Im folgenden Beispiel wird ein AutomationFocusChangedEvent Listener deklariert, um den Durchlauf von Tabellenelementen in einem Tabellencontainer nachzuverfolgen. Elementeigenschaften werden bei jedem Fokusänderungsereignis aufgezeichnet.

///--------------------------------------------------------------------
/// <summary>
/// Set up table item event listeners.
/// </summary>
/// <remarks>
/// The event listener is essentially a focus change listener.
/// Since this is a global desktop listener, a filter would be required 
/// to ignore focus change events outside the table.
/// </remarks>
///--------------------------------------------------------------------
private void SetTableItemEventListeners()
{
    AutomationFocusChangedEventHandler tableItemFocusChangedListener =
        new AutomationFocusChangedEventHandler(OnTableItemFocusChange);
    Automation.AddAutomationFocusChangedEventHandler(
        tableItemFocusChangedListener);
}

'''--------------------------------------------------------------------
''' <summary>
''' Set up table item event listeners.
''' </summary>
''' <remarks>
''' The event listener is essentially a focus change listener.
''' Since this is a global desktop listener, a filter would be required 
''' to ignore focus change events outside the table.
''' </remarks>
'''--------------------------------------------------------------------
Private Sub SetTableItemEventListeners( _
ByVal targetControl As AutomationElement)
    Dim tableItemFocusChangedListener As AutomationFocusChangedEventHandler = _
    AddressOf OnTableItemFocusChange
    Automation.AddAutomationFocusChangedEventHandler( _
    tableItemFocusChangedListener)

End Sub

///--------------------------------------------------------------------
/// <summary>
/// Event handler for table item focus change.
/// Can be used to track traversal of individual table items 
/// within a table.
/// </summary>
/// <param name="src">Object that raised the event.</param>
/// <param name="e">Event arguments.</param>
///--------------------------------------------------------------------
private void OnTableItemFocusChange(
    object src, AutomationFocusChangedEventArgs 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 TableItemPattern from the source of the event.
    TableItemPattern tableItemPattern =
        GetTableItemPattern(sourceElement);

    if (tableItemPattern == null)
    {
        return;
    }

    // Get a TablePattern from the container of the current element.
    TablePattern tablePattern =
        GetTablePattern(tableItemPattern.Current.ContainingGrid);

    if (tablePattern == null)
    {
        return;
    }

    AutomationElement tableItem = null;
    try
    {
        tableItem = tablePattern.GetItem(
        tableItemPattern.Current.Row,
        tableItemPattern.Current.Column);
    }
    catch (ArgumentOutOfRangeException)
    {
        // If the requested row coordinate is larger than the RowCount 
        // or the column coordinate is larger than the ColumnCount.
        // -- OR --
        // If either of the requested row or column coordinates 
        // is less than zero.
        // TO DO: error handling.
    }

    // Further event processing can be done at this point.
    // For the purposes of this sample we can just record item properties.
    string controlType = 
        tableItem.Current.ControlType.LocalizedControlType;
    AutomationElement[] columnHeaders = 
        tableItemPattern.Current.GetColumnHeaderItems();
    AutomationElement[] rowHeaders = 
        tableItemPattern.Current.GetRowHeaderItems();
    int itemRow = tableItemPattern.Current.Row;
    int itemColumn = tableItemPattern.Current.Column;
    int itemRowSpan = tableItemPattern.Current.RowSpan;
    int itemColumnSpan = tableItemPattern.Current.ColumnSpan;
}

///--------------------------------------------------------------------
/// <summary>
/// Handles the application shutdown.
/// </summary>
/// <param name="args">Event arguments.</param>
///--------------------------------------------------------------------
protected override void OnExit(System.Windows.ExitEventArgs args)
{
    Automation.RemoveAllEventHandlers();
    base.OnExit(args);
}

'''--------------------------------------------------------------------
''' <summary>
''' Event handler for table item focus change.
''' Can be used to track traversal of individual table items 
''' within a table.
''' </summary>
''' <param name="src">Object that raised the event.</param>
''' <param name="e">Event arguments.</param>
'''--------------------------------------------------------------------
Private Sub OnTableItemFocusChange( _
ByVal src As Object, ByVal e As AutomationFocusChangedEventArgs)
    ' 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 TableItemPattern from the source of the event.
    Dim tableItemPattern As TableItemPattern = _
    GetTableItemPattern(sourceElement)

    If tableItemPattern Is Nothing Then
        Return
    End If

    ' Get a TablePattern from the container of the current element.
    Dim tablePattern As TablePattern = _
    GetTablePattern(tableItemPattern.Current.ContainingGrid)

    If tablePattern Is Nothing Then
        Return
    End If

    Dim tableItem As AutomationElement = Nothing
    Try
        tableItem = tablePattern.GetItem( _
        tableItemPattern.Current.Row, tableItemPattern.Current.Column)

    Catch exc As ArgumentOutOfRangeException
        ' If the requested row coordinate is larger than the RowCount 
        ' or the column coordinate is larger than the ColumnCount.
        ' -- OR --
        ' If either of the requested row or column coordinates 
        ' is less than zero.
        ' TO DO: error handling.
    End Try

    ' Further event processing can be done at this point.
    ' For the purposes of this sample we can just record item properties.
    Dim controlType As String = _
        tableItem.Current.ControlType.LocalizedControlType
    Dim columnHeaders As AutomationElement() = _
    tableItemPattern.Current.GetColumnHeaderItems()
    Dim rowHeaders As AutomationElement() = _
    tableItemPattern.Current.GetRowHeaderItems()
    Dim itemRow As Integer = tableItemPattern.Current.Row
    Dim itemColumn As Integer = tableItemPattern.Current.Column
    Dim itemRowSpan As Integer = tableItemPattern.Current.RowSpan
    Dim itemColumnSpan As Integer = tableItemPattern.Current.ColumnSpan

End Sub


'''--------------------------------------------------------------------
''' <summary>
''' Handles the application shutdown.
''' </summary>
''' <param name="args">Event arguments.</param>
'''--------------------------------------------------------------------
Protected Overrides Sub OnExit(ByVal args As System.Windows.ExitEventArgs)
    Automation.RemoveAllEventHandlers()
    MyBase.OnExit(args)

End Sub

Weitere Informationen

• Verfügbarmachen eines Tabelleninhalts durch Benutzeroberflächenautomatisierung