I think I've found a bug in wx.gizmos.TreeListCtrl, could someone
confirm it please, and perhaps give me advice on how to submit it
- as reading the wxwidgets bug tracker system, it doesn't seem
applicable to wxPython. Here's the detail:
The class wx.gizmos.TreeListCtrl shows duplicated items when a tree
element is collapsed if the collapse causes the tree position within
the panel to move.
This can be seen on the demo distributed with wxPython. I first
observed this on ubuntu with python2.5 wx.python2.8.7.1 and also
tried it on the latest Debian Lenny with python2.5 and a freshly
downloaded wxPython2.8.10.1 and its associated demo (from the
wxPython site).
I've included sample code below - derived from the demo code -
which shows a TreeListCtrl and can be used to demonstrate the bug
with the following steps:
1 Run the code provided, and a frame will appear showing a tree
list control with fifteen items.
2 Resize the frame vertical height just to the point where it fits
the TreeListCtrl without scrollbars appearing.
3 Expand item 0 - this shows five subitems, and the bottom of the
tree is pushed out of view, causing the vertical scrollbar to appear.
4 Move the vertical scrollbar down as far as it will go - revealing
the bottom of the tree, and hiding some of the top of the tree
5 Expand item 12 - this opens another five sub-items and again pushes
the bottom of the tree out of view - the scrollbar changes accordingly.
6 Move the scrollbar down again, as far as it will go - again revealing
the bottom of the tree.
7 Collapse item 12. This causes the tree to re-position and the bug
appears - you will now notice duplicate items have appeared on the tree.
The sample code follows,
Regards
Bernie
···
#---------------------------------------------------------------
import wx
import wx.gizmos
class TestFrame(wx.Frame):
def __init__(self):
wx.Frame.__init__(self, None, -1, "Test Frame", size=(300, 400))
panel = TestPanel(self)
class TestPanel(wx.Panel):
def __init__(self, parent):
wx.Panel.__init__(self, parent, -1)
self.Bind(wx.EVT_SIZE, self.OnSize)
self.tree = wx.gizmos.TreeListCtrl(self, -1)
isz = (16,16)
il = wx.ImageList(isz[0], isz[1])
fldridx = il.Add(wx.ArtProvider_GetBitmap(wx.ART_FOLDER,
wx.ART_OTHER, isz))
fldropenidx = il.Add(wx.ArtProvider_GetBitmap(wx.ART_FILE_OPEN,
wx.ART_OTHER, isz))
fileidx = il.Add(wx.ArtProvider_GetBitmap(wx.ART_NORMAL_FILE,
wx.ART_OTHER, isz))
self.tree.SetImageList(il)
self.il = il
# create some columns
self.tree.AddColumn("Main column")
self.tree.AddColumn("Column 1")
self.tree.SetMainColumn(0) # the one with the tree in it...
self.tree.SetColumnWidth(0, 175)
self.root = self.tree.AddRoot("The Root Item")
self.tree.SetItemText(self.root, "col 1 root", 1)
self.tree.SetItemImage(self.root, fldridx,
which = wx.TreeItemIcon_Normal)
self.tree.SetItemImage(self.root, fldropenidx,
which = wx.TreeItemIcon_Expanded)
for x in range(15):
txt = "Item %d" % x
child = self.tree.AppendItem(self.root, txt)
self.tree.SetItemText(child, txt, 1)
self.tree.SetItemImage(child, fldridx,
which = wx.TreeItemIcon_Normal)
self.tree.SetItemImage(child, fldropenidx,
which = wx.TreeItemIcon_Expanded)
for y in range(5):
txt = "item %d-%s" % (x, chr(ord("a")+y))
last = self.tree.AppendItem(child, txt)
self.tree.SetItemText(last, txt, 1)
self.tree.Expand(self.root)
def OnSize(self, evt):
self.tree.SetSize(self.GetSize())
if __name__ == "__main__":
app = wx.PySimpleApp()
frame = TestFrame()
frame.Show(True)
app.MainLoop()
# -------- sample code ends -------------------------------------------