/// <summary>
/// Retrieves the range of a child object.
/// </summary>
/// <param name="childElement">The child element. If the element is not
/// a child of the text container then an InvalidOperation exception is
/// thrown.</param>
/// <returns>A range that spans the child element.</returns>
public TextPatternRange RangeFromChild(AutomationElement childElement)
{
if (childElement == null)
{
throw new ArgumentNullException("childElement");
}
SafeTextRangeHandle hTextRange = UiaCoreApi.TextPattern_RangeFromChild(_hPattern, childElement.RawNode);
return(TextPatternRange.Wrap(hTextRange, this));
}
/// <summary>
/// Finds the range nearest to a screen coordinate.
/// If the coordinate is within the bounding rectangle of a character then the
/// range will contain that character. Otherwise, it will be a degenerate
/// range near the point, chosen in an implementation-dependent manner.
/// An InvalidOperation exception is thrown if the point is outside of the
/// client area of the text container.
/// </summary>
/// <param name="screenLocation">The location in screen coordinates.</param>
/// <returns>A degenerate range nearest the specified location.</returns>
public TextPatternRange RangeFromPoint(Point screenLocation)
{
//If we are not within the client area throw an exception
Rect rect = (Rect)_element.GetCurrentPropertyValue(AutomationElement.BoundingRectangleProperty);
if (screenLocation.X < rect.Left || screenLocation.X >= rect.Right || screenLocation.Y < rect.Top || screenLocation.Y >= rect.Bottom)
{
throw new ArgumentException(SR.Get(SRID.ScreenCoordinatesOutsideBoundingRect));
}
SafeTextRangeHandle hTextRange = UiaCoreApi.TextPattern_RangeFromPoint(_hPattern, screenLocation);
return(TextPatternRange.Wrap(hTextRange, this));
}