void OnPaint (Bool before, wxDC *dc, float left, float top, float right, float bottom, float dx,
float dy, int drawCaret)
This overrideable method provides a way to add arbitrary graphics to a
buffer's view. OnPaint is called just before and just after
every painting of the buffer. before is TRUE when OnPaint
is being called just before a painting. The left, top,
right, and bottom coordinates specify which region of the
buffer is being repainted, in buffer co-ordinates. To get the
co-ordinates for dc, you will need to offset these numbers by
(dx, dy). See Caret Ownership (section 
) for information about
drawCaret.
See also wxMediaBuffer::InvalidateBitmapCache (section ).