The secret is to do it a little bit at a time.
For example if you have
class CMyView : CView
{
};
Introduce a drawing object:
class CMyView : CView
{
CMyPainter m_paint;
};
Start with the lowest level drawing functions and make them public members
of m_paint.
Check that the code still works.
Move more to m_paint.
Check that the code still works.
As methods in m_paint become called only by other methods in m_paint, make
them private.
Check that the code still works.
Ultimately you should end up with something like
class CMyPainter
{
public:
TopLevelDraw( CDC *pDC, ....);
private:
// Lots of other stuff.
};
At this stage you can create a button for a dialogue box:
class CMyButton : public CButton
{
CMyPainter m_paint;
};
make it owner draw and call
m_paint.TopLevelDraw(...)
from your OnDraw()
member.
The print is that you can change a little bit at a time, make sure it still
works, and correct any problems as you go along, whereas debugging it all at
once might be an awful pain. A sort of encapsulation by stealth. :-)
Dave
--
David Webber
Author MOZART the music processor for Windows -
http://www.mozart.co.uk
For discussion/support see
http://www.mozart.co.uk/mzusers/mailinglist.htm