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 GetTextRange(UITextPosition fromPosition, UITextPosition toPosition)
{
// Generate IndexedPosition instances that wrap the to and from ranges
IndexedPosition @from = (IndexedPosition)fromPosition;
IndexedPosition @to = (IndexedPosition)toPosition;
NSRange range = new NSRange(Math.Min(@from.Index, @to.Index), Math.Abs(to.Index - @from.Index));
return(IndexedRange.GetRange(range));
}
public static IndexedPosition GetPosition (int index)
{
IndexedPosition result;
if (!indexes.TryGetValue (index, out result)) {
result = new IndexedPosition (index);
indexes [index] = result;
}
return result;
}
public static IndexedPosition GetPosition(int index)
{
IndexedPosition result;
if (!indexes.TryGetValue(index, out result))
{
result = new IndexedPosition(index);
indexes [index] = result;
}
return(result);
}
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));
}
NSComparisonResult ComparePosition(UITextPosition position, UITextPosition other)
{
IndexedPosition pos = (IndexedPosition)position;
IndexedPosition o = (IndexedPosition)other;
// For this sample, we simply compare position index values
if (pos.Index == o.Index)
{
return(NSComparisonResult.Same);
}
else if (pos.Index < o.Index)
{
return(NSComparisonResult.Ascending);
}
else
{
return(NSComparisonResult.Descending);
}
}
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));
}
int GetOffset (IndexedPosition @from, IndexedPosition toPosition)
{
return @from.Index - toPosition.Index;
}
int GetOffset(IndexedPosition @from, IndexedPosition toPosition)
{
return(@from.Index - toPosition.Index);
}
