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TextPattern.GetVisibleRanges Method

  • Reference

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.

Applies to

See also