OOP Newbie mixing COM, wxPython, BOA

Mojo mojo at geofinity.com
Sun Feb 10 19:03:31 CET 2002


The subject line could easily have been "fool in way over his head..."

That said, I got farther than I thought possible only to be stymied by what
I'd guess is either an idiom I don't understand (being an OOP newbie) or a
question of variable scope/namespace...

My problem is that my app has two classes (a class encapsulating the GUI,
and a class that implements an event handler for a COM object.)  I don't
know how to access GUI objects in the former, from code in the latter.

I've built a GUI using the latest BOA Constructor (very nice), wxPython
(2.3.2.1) on Python 2.1.1 (ActiveState).  The GUI runs nicely, and is
encapsulated in a nifty class I named "VpFrame".  VpFrame includes a menu
with event bindings to internal (VpFrame) methods, and a tree widget.  The
tree widget is created inside a VpFrame method named "_init_ctrls__" using
the command:

self.buddyTree = wxTreeCtrl(id = wxID_VPFRAMEBUDDYTREE, name = 'buddyTree',
parent = self.mainSplit, pos = wxPoint(354, 2), size = wxSize(157, 407),
style = wxTR_HAS_BUTTONS, validator = wxDefaultValidator)

Next, I used win32com to add access to the JabberCOM object and created a
class to process events coming from the COM object.  This event processing
class is called and "JabberEvents" and works also.  My menu from VpFrame
successfully executes a "Connect" method via the JabberCOM object.  This
object, in turn, sends a message to the remote server (verified) and
receives an "OnConnect" event (verified) from the server.  I know that
"JabberEvents" is working because it's "OnConnect" event handler contains
the code that makes my "presence" visible to other users of the server.
Only when this event is processed do I become "Online" to other users.  I've
verified that all of this works simply by logging in (as a different user,
on a different machine) and watching for my presence to appear.  It does.

My next step is to add code to the "OnConnect" event handler (in the
"JabberEvents" class) that adds some items (e.g. my list of buddies) to the
tree object in VpFrame.  This is where I'm stumped.  For code inside the
VpFrame class, I can simply call "self.buddyTree.AddRoot("Root Item On
Tree") and it works.  Unfortunately none of my (scattershot) attempts to do
this from the JabberEvents class work.  I've tried "buddyTree.AddRoot" (no
global attribute named "buddyTree"), "VpFrame.buddyTree.AddRoot" (class
VpFrame has no attribute 'buddyTree'), etc.  I also tried creating a method
inside the VpFrame class (FillTree()) to do the tree management.  I can call
this method from the menu (self.FillTree() inside the VpFrame class) but not
from code in the JabberEvents class.

How do I call the "AddRoot" method of the "buddyTree" object in the VpFrame
class, from the separate class "JabberEvents"?  Any help, pointers,
explanations greatly appreciated.  I've include the code (trimmed as much as
possible for brevity) below.

Thanks,

David
---
--
-


#########  Code For "vp.py" #########
from wxPython.wx import *
import VpFrame
modules ={'VpFrame': [1, 'Main frame of Application', 'VpFrame.py']}

class BoaApp(wxApp):
    def OnInit(self):
        self.main = VpFrame.create(None)
        self.main.Show(true)
        self.SetTopWindow(self.main)
        return true

def main():
    application = BoaApp(0)
    application.MainLoop()

if __name__ == '__main__':
    main()

#########  Code For "VpFrame.py" #########
def create(parent):
    return VpFrame(parent)

[wxID_VPFRAME, wxID_VPFRAMEBUDDYTREE, wxID_VPFRAMEMAINSPLIT] = map(lambda
_init_ctrls: wxNewId(), range(10))

class JabberEvents:
    """Main handler for Jabber events"""

    def OnConnect(self):
        """Event occurs when a sucessfull connection to the Jabber server is
established"""
        jab.Available = 1
        jabRoster.Fetch()
        try:
            VpFrame.buddyTree.AddRoot('This is some text')
        except:
            TBStrings = traceback.format_exception(*sys.exc_info())
            for Line in TBStrings:
                print Line

jab = win32com.client.DispatchWithEvents("JabberCOM.JabberSession",
JabberEvents)
jabRoster = jab.Roster

[wxID_WXFRAME1FILEMENUITEMS0, wxID_WXFRAME1FILEMENUITEMS1,
wxID_WXFRAME1FILEMENUITEMS2, wxID_WXFRAME1FILEMENUITEMS3] = map(lambda
_init_coll_FileMenu_Items: wxNewId(), range(4))

class VpFrame(wxFrame):
    """ Main Application "Frame", provides the (GUI) user interface"""

    def _init_coll_menuBar1_Menus(self, parent):
        parent.Append(menu = self.FileMenu, title = 'File')

    def _init_coll_FileMenu_Items(self, parent):
        parent.Append(checkable = false, helpString = 'Connect to the VP
System', id = wxID_WXFRAME1FILEMENUITEMS0, item = 'Connect')
        parent.Append(checkable = false, helpString = 'Disconnect from the
VP system', id = wxID_WXFRAME1FILEMENUITEMS1, item = 'Disconnect')
        parent.Append(checkable = false, helpString = 'Exit VP', id =
wxID_WXFRAME1FILEMENUITEMS3, item = 'Exit')
        EVT_MENU(self, wxID_WXFRAME1FILEMENUITEMS0, self.OnFileMenuConnect)
        EVT_MENU(self, wxID_WXFRAME1FILEMENUITEMS1,
self.OnFileMenuDisconnect)
        EVT_MENU(self, wxID_WXFRAME1FILEMENUITEMS3, self.OnFileMenuExit)

    def _init_utils(self):
        self.FileMenu = wxMenu(title = '')
        self._init_coll_FileMenu_Items(self.FileMenu)
        self.menuBar1 = wxMenuBar()
        self._init_coll_menuBar1_Menus(self.menuBar1)

    def _init_ctrls(self, prnt):
        wxFrame.__init__(self, id = wxID_VPFRAME, name = '', parent = prnt,
pos = wxPoint(367, 442), size = wxSize(521, 485), style =
wxDEFAULT_FRAME_STYLE, title = 'VP Version 3.0')
        self._init_utils()
        self.SetClientSize(wxSize(513, 451))
        self.SetMenuBar(self.menuBar1)

        self.mainSplit = wxSplitterWindow(id = wxID_VPFRAMEMAINSPLIT, name =
'mainSplit', parent = self, point = wxPoint(0, 0), size = wxSize(513, 412),
style = wxSP_3D)
        self.mainSplit.SetMinimumPaneSize(100)
        self.mainSplit.SetSashSize(4)

        self.buddyTree = wxTreeCtrl(id = wxID_VPFRAMEBUDDYTREE, name =
'buddyTree', parent = self.mainSplit, pos = wxPoint(354, 2), size =
wxSize(157, 407), style = wxTR_HAS_BUTTONS, validator = wxDefaultValidator)
        self.buddyTree.SetToolTipString('Buddy Tree')
        self.mainSplit.SplitVertically(self.mainNote, self.buddyTree, 350)

        self._init_coll_mainNote_Pages(self.mainNote)

    def __init__(self, parent):
        self._init_ctrls(parent)

    def FillTree(self):
        myStat = "My Roster (" + `jabRoster.Count` + ")"
        btRoot = self.buddyTree.AddRoot(myStat)
        btOnline = self.buddyTree.AppendItem(btRoot, 'Online Buddies')
        btOffline = self.buddyTree.AppendItem(btRoot, 'Offline Buddies')
        self.buddyTree.Expand(btRoot)
        self.buddyTree.Expand(btOnline)
        self.buddyTree.Expand(btOffline)

    def OnFileMenuConnect(self, event):
        jab.Username = 'userid'
        jab.Password = 'password'
        jab.Resource = 'resname'
        jab.Server = 'servername'
        jab.Port = 'portnum'
        jab.DoConnect(0,5)

    def OnFileMenuExit(self, event):
        self.Close()

    def OnFileMenuDisconnect(self, event):
        jab.DoDisconnect(1)






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