[Qt-interest] sketcher program

[phil prentice]

Hi
  I Really dig Qt, but have difficulty deciding the best way of doing things 
sometimes.
  I have a design question regarding a Qt a play program that I am writing.  
Its very basic, but I was wondering if anyone would be able to point me in 
the right direction with regard to the correct way of accessing member 
variables in the mainwindow.

  I have a main window (with menus etc) which has a central widget which is a 
QMdiArea.
  The QMdiArea has a list of QMdiSubwindows.  
  Each subwindow has a graphicsView  (set by setWidget())
  
  I also have a list of scenes (QGraphicsScene, one for each open document).  
This list at the moment I keep in the QMainwindow object.  Each subwindow's 
(graphicsview) is associated with one scene.  Each scene, obviously can have 
more then one view (different zoom factors or what ever).

  At the moment I have a derived graphicsview and I have overwridden the 
mousePressEvent() member function to start the creation of elements (say a 
line).  I intend to grab the cursor until all the required points have been 
input to define the element, and then create it in the appropriate scene

  To start with rightly or wrongly I am hoping to create an element item (say 
a QGraphicsLineItem) using multiple calls to the mousePressEvent() function.

  However to do this I need access to the current pen colour which is handled 
by the menu options in the mainwindow object.  Its copied into a member 
variable inside the derived Qmainwindow object.

  How should I access it....should I use qApp and search for the mainwindow 
widget in its widget list(Seems a bit naff)  or should I make the mainwindow 
object global(I could bodge it that way, but surely there is a better way). I 
could create a static function in the mainwindow that returns the current pen 
(the trouble there is I might need to access loads of other member 
variables)?  What would be considered the best method to do this?

Your thoughts would be very welcome
Thanks for your help