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));
}
IndexedRange GetCharacterRange(UITextPosition position, UITextLayoutDirection direction)
{
// Note that this sample assumes LTR text direction
IndexedPosition pos = (IndexedPosition)position;
NSRange result = new NSRange(pos.Index, 1);
switch (direction)
{
case UITextLayoutDirection.Up:
case UITextLayoutDirection.Left:
result = new NSRange(pos.Index - 1, 1);
break;
case UITextLayoutDirection.Right:
case UITextLayoutDirection.Down:
result = new NSRange(pos.Index, 1);
break;
}
// Return range using our UITextRange implementation
// Note that range is not currently checked against document range.
return(IndexedRange.GetRange(result));
}
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));
}
IndexedRange GetCharacterRange (UITextPosition position, UITextLayoutDirection direction)
{
// Note that this sample assumes LTR text direction
IndexedPosition pos = (IndexedPosition) position;
NSRange result = new NSRange (pos.Index, 1);
switch (direction) {
case UITextLayoutDirection.Up:
case UITextLayoutDirection.Left:
result = new NSRange (pos.Index - 1, 1);
break;
case UITextLayoutDirection.Right:
case UITextLayoutDirection.Down:
result = new NSRange (pos.Index, 1);
break;
}
// Return range using our UITextRange implementation
// Note that range is not currently checked against document range.
return IndexedRange.GetRange (result);
}
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);
}
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);
}
IndexedRange GetCharacterRange(UITextPosition position, UITextLayoutDirection direction)
{
throw new NotImplementedException();
}
IndexedPosition GetPosition(UITextRange range, UITextLayoutDirection direction)
{
throw new NotImplementedException();
}
IndexedPosition GetPosition(UITextPosition position, UITextLayoutDirection direction, int offset)
{
throw new NotImplementedException();
}
