"Martin Drautzburg" <[EMAIL PROTECTED]> wrote in message news:[EMAIL PROTECTED] > In the wx demoy TreeCtrl.py I find the following code, that should > have no effect but seems to be needed nevertheless. > > class TestTreeCtrlPanel(wx.Panel): > def __init__(self, parent, log): > [...} > self.tree = MyTreeCtrl(self, tID, wx.DefaultPosition, ... > isz = (16,16) > il = wx.ImageList(isz[0], isz[1]) > fldridx = il.Add(wx.ArtProvider_GetBitmap(wx.ART_FOLDER, wx.ART... > [...] > > self.tree.SetImageList(il) > --> self.il = il > > What is the effect of the last statement? self.il is not used > anywhere. I used similar code in my application and it crashes unless > I assign the image list to the parent panel. The name of the attribute > does not seem to matter. I can write self.foo=il just as well, but > without it it crashes.
Two possibilities come to mind: - used by a base class wx.Panel for which you do not have the source (although if this were the case, I would think the attribute name would be significant) - needed to retain a reference handle to the image list, to prevent it from being garbage collected (kind of far-fetched, but consistent with the "name it anything you want" behavior) -- Paul -- http://mail.python.org/mailman/listinfo/python-list
