TextPattern.GetVisibleRanges Method

Definition

Namespace:

System.Windows.Automation

Assembly:

UIAutomationClient.dll

Retrieves an array of disjoint text ranges from a text container where each text range begins with the first partially visible line through to the end of the last partially visible line.

public:
 cli::array <System::Windows::Automation::Text::TextPatternRange ^> ^ GetVisibleRanges();

public System.Windows.Automation.Text.TextPatternRange[] GetVisibleRanges ();

member this.GetVisibleRanges : unit -> System.Windows.Automation.Text.TextPatternRange[]

Public Function GetVisibleRanges () As TextPatternRange()

Returns

TextPatternRange[]

The collection of visible text ranges within the container or an empty array. Null is never returned.

Examples

private TextPatternRange[] CurrentVisibleRanges(AutomationElement target)
{
    // Specify the control type we're looking for, in this case 'Document'
    PropertyCondition cond = new PropertyCondition(AutomationElement.ControlTypeProperty, ControlType.Document);

    // target --> The root AutomationElement.
    AutomationElement textProvider = target.FindFirst(TreeScope.Descendants, cond);

    TextPattern textpatternPattern = textProvider.GetCurrentPattern(TextPattern.Pattern) as TextPattern;

    if (textpatternPattern == null)
    {
        Console.WriteLine("Root element does not contain a descendant that supports TextPattern.");
        return null;
    }
    return textpatternPattern.GetVisibleRanges();
}

Private Function CurrentVisibleRanges(ByVal target As AutomationElement) As TextPatternRange()
    ' Specify the control type we're looking for, in this case 'Document'
    Dim cond As PropertyCondition = New PropertyCondition(AutomationElement.ControlTypeProperty, ControlType.Document)

    ' target --> The root AutomationElement.
    Dim textProvider As AutomationElement = target.FindFirst(TreeScope.Descendants, cond)

    Dim textpatternPattern As TextPattern = CType(textProvider.GetCurrentPattern(TextPattern.Pattern), TextPattern)

    If (textpatternPattern Is Nothing) Then
        Console.WriteLine("Root element does not contain a descendant that supports TextPattern.")
        Return Nothing
    End If

    Return textpatternPattern.GetVisibleRanges()
End Function

Remarks

Disjoint text ranges may occur when any content of a text container is obscured by an overlapping window or other object, or when a text container with a multi-column layout has one or more columns partially scrolled out of view.

If no text is visible, a degenerate (empty) text range is returned. This empty range can be returned if the text container is empty or when all text is scrolled out of view.

See also

• TextPatternRange