public BufferCell[,] GetBufferContents(Rectangle rectangle)
{
BufferCell[,] bufferCells = new BufferCell[(rectangle.Top - rectangle.Bottom), (rectangle.Right - rectangle.Left)];
try
{
var cur = (int)
((Next.ElementEnd.GetCharacterRect(LogicalDirection.Backward).Bottom + ScrollViewer.ContentVerticalOffset)
/ (double.IsNaN(Document.LineHeight) ? Document.FontSize : Document.LineHeight));
int count;
var nextContextPosition = Next.ElementEnd.GetNextContextPosition(LogicalDirection.Backward);
var start = nextContextPosition?.GetLineStartPosition(rectangle.Bottom - cur, out count);
if (start != null)
{
// for each line
for (var ln = 0; ln <= rectangle.Top - rectangle.Bottom; ln++)
{
// Resharper is being stupid here, these can't actually be null:
Debug.Assert(start != null, "start != null");
var next = start.GetLineStartPosition(1);
start = start.GetPositionAtOffset(rectangle.Left);
// Resharper is being stupid here, these can't actually be null:
Debug.Assert(start != null, "start != null");
Debug.Assert(next != null, "next != null");
// if there's text on this line after that char, there's no output
if (start.GetOffsetToPosition(next) <= 0) { continue; }
var end = start.GetPositionAtOffset(1);
Debug.Assert(end != null, "end != null");
// for each character in the line
int c = 0, width = rectangle.Right - rectangle.Left;
while (end.GetOffsetToPosition(next) <= 0 && c < width)
{
var range = new TextRange(start, end);
bufferCells[ln, c++] = new BufferCell(
range.Text[0],
range.GetBackgroundAsConsoleColor(),
range.GetForegroundAsConsoleColor(),
BufferCellType.Complete);
end = end.GetPositionAtOffset(1);
}
// for the whitespace ta the end of the line
for (; c < width; c++)
{
bufferCells[ln, c] = new BufferCell(' ', ForegroundColor, BackgroundColor, BufferCellType.Complete);
}
start = next;
}
}
}
catch (Exception ex)
{
Write(ConsoleBrushes.ErrorForeground, ConsoleBrushes.ErrorBackground, ex.Message);
}
return bufferCells;
}