private Point TextPositionToPoint(Position p)
{
Point pf = new Point (0, 0);
Size sz = StringSize (((string)lines[p.Line]).Substring (0, p.Offset));
Size fullSz = StringSize ((string)lines[p.Line]);
switch (Alignment) {
case TextAlignment.Left:
pf = new Point (clickPoint.X + sz.Width, clickPoint.Y + (sz.Height * p.Line));
break;
case TextAlignment.Center:
pf = new Point (clickPoint.X + (sz.Width - (fullSz.Width / 2)), clickPoint.Y + (sz.Height * p.Line));
break;
case TextAlignment.Right:
pf = new Point (clickPoint.X + (sz.Width - fullSz.Width), clickPoint.Y + (sz.Height * p.Line));
break;
default:
throw new System.ComponentModel.InvalidEnumArgumentException ("Invalid Alignment");
}
return pf;
}
private Position PointToTextPosition(Point pf)
{
int dx = pf.X - clickPoint.X;
int dy = pf.Y - clickPoint.Y;
int line = (int)Math.Floor (dy / (float)this.sizes[0].Height);
if (line < 0) {
line = 0;
} else if (line >= lines.Count) {
line = lines.Count - 1;
}
int offset = FindOffsetPosition (dx, (string)lines[line], line);
Position p = new Position (line, offset);
if (p.Offset >= ((string)lines[p.Line]).Length) {
p.Offset = ((string)lines[p.Line]).Length;
}
return p;
}
private int PositionToIndex(Position p)
{
int index = 0;
for (int i = 0; i < p.Line; i++)
index += StringToByteSize(lines[i]) + 1;
index += StringToByteSize(lines[p.Line].Substring(0, p.Offset));
return index;
}
public Point TextPositionToPoint(Position p)
{
int index = PositionToIndex (p);
var rect = layout.IndexToPos (index);
int x = Pango.Units.ToPixels (rect.X) + origin.X;
int y = Pango.Units.ToPixels (rect.Y) + origin.Y;
return new Point (x, y);
}
public void SetCursorPosition(Position position)
{
linePos = position.Line;
textPos = position.Offset;
}
public void SetCursorPosition(Position position, bool clearSelection)
{
linePos = position.Line;
textPos = position.Offset;
if (clearSelection)
selectionRelativeIndex = 0;
}