IndexedPosition GetPosition(UITextRange range, UITextLayoutDirection direction)
{
// Note that this sample assumes LTR text direction
IndexedRange r = (IndexedRange)range;
int pos = r.Range.Location;
// For this sample, we just return the extent of the given range if the
// given direction is "forward" in a LTR context (UITextLayoutDirectionRight
// or UITextLayoutDirectionDown), otherwise we return just the range position
switch (direction)
{
case UITextLayoutDirection.Up:
case UITextLayoutDirection.Left:
pos = r.Range.Location;
break;
case UITextLayoutDirection.Right:
case UITextLayoutDirection.Down:
pos = r.Range.Location + r.Range.Length;
break;
}
// Return text position using our UITextPosition implementation.
// Note that position is not currently checked against document range.
return(IndexedPosition.GetPosition(pos));
}
RectangleF CaretRect(UITextPosition position)
{
// FIXME: the Objective-C code doesn't get a null position
// This is the reason why we don't get the autocorrection suggestions
// (it'll just autocorrect without showing any suggestions).
// Possibly due to http://bugzilla.xamarin.com/show_bug.cgi?id=265
IndexedPosition pos = (IndexedPosition)(position ?? IndexedPosition.GetPosition(0));
// Get caret rect from underlying SimpleCoreTextView
RectangleF rect = textView.CaretRect(pos.Index);
// Convert rect to our view coordinates
return(ConvertRectFromView(rect, textView));
}
IndexedPosition GetPosition(UITextPosition position, int offset)
{
// Generate IndexedPosition instance, and increment index by offset
IndexedPosition pos = (IndexedPosition)position;
int end = pos.Index + offset;
// Verify position is valid in document
if (end > text.Length || end < 0)
{
return(null);
}
return(IndexedPosition.GetPosition(end));
}
IndexedPosition GetPosition(UITextPosition position, UITextLayoutDirection direction, int offset)
{
// Note that this sample assumes LTR text direction
IndexedPosition pos = (IndexedPosition)position;
int newPos = pos.Index;
switch (direction)
{
case UITextLayoutDirection.Right:
newPos += offset;
break;
case UITextLayoutDirection.Left:
newPos -= offset;
break;
case UITextLayoutDirection.Up:
case UITextLayoutDirection.Down:
// This sample does not support vertical text directions
break;
}
// Verify new position valid in document
if (newPos < 0)
{
newPos = 0;
}
if (newPos > text.Length)
{
newPos = text.Length;
}
return(IndexedPosition.GetPosition(newPos));
}