TextPattern.GetVisibleRanges Method
Definition
Important
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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
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.
