wxglade list tree not showing properly - python-3.x

Question

I am new to wxglade and trying to create a form to show tabs and split window. There are going to be tree lists on the left pane. The issue is that when I open the form, it shows the treelist but the list cannot be collapsed or expanded. When I go to 2nd tab and come back to the first, tree list is shown in small box.
import wx
# Define the tab content as classes:
class TabOne(wx.Panel):
def __init__(self, parent):
wx.Panel.__init__(self, parent)
self.SetSize((400, 300))
self.window_1 = wx.SplitterWindow(self, wx.ID_ANY)
self.window_1_pane_1 = wx.ScrolledWindow(self.window_1, wx.ID_ANY, style=wx.BORDER_RAISED | wx.TAB_TRAVERSAL)
#self.button_1 = wx.Button(self.window_1_pane_1, wx.ID_ANY, "button_1")
#t = wx.StaticText(self, -1, "This is the first tab", (100,100)) start list
il = wx.ImageList(16,16)
self.fldridx = il.Add(wx.ArtProvider.GetBitmap(wx.ART_FOLDER, wx.ART_OTHER, (16,16)))
self.fldropenidx = il.Add(wx.ArtProvider.GetBitmap(wx.ART_FILE_OPEN, wx.ART_OTHER, (16,16)))
self.fileidx = il.Add(wx.ArtProvider.GetBitmap(wx.ART_NORMAL_FILE, wx.ART_OTHER, (16,16)))
self.tree = wx.TreeCtrl(self, style=wx.TR_DEFAULT_STYLE | wx.TR_EDIT_LABELS)
self.tree.AssignImageList(il)
root = self.tree.AddRoot("Server")
self.tree.SetItemData(root, None)
self.tree.SetItemImage(root, self.fldridx,wx.TreeItemIcon_Normal)
self.tree.SetItemImage(root, self.fldropenidx,wx.TreeItemIcon_Expanded)
tree = ["A","B","C","D","E","F","G","H"]
self.AddTreeNodes(root, tree)
self.tree.Expand(root)
def AddTreeNodes(self, parentItem, items):
for item in items:
if type(item) == str:
newItem = self.tree.AppendItem(parentItem, item)
self.tree.SetItemData(newItem, None)
#self.tree.SetItemImage(newItem, self.fileidx,wx.TreeItemIcon_Normal)
else:
newItem = self.tree.AppendItem(parentItem, item[0])
self.tree.SetItemPyData(newItem, None)
#self.tree.SetItemImage(newItem, self.fldridx,wx.TreeItemIcon_Normal)
self.tree.SetItemImage(newItem, self.fldropenidx,wx.TreeItemIcon_Expanded)
self.AddTreeNodes(newItem, item[1])
#end list
self.window_1_pane_2 = wx.Panel(self.window_1, wx.ID_ANY)
self.window_1_pane_1.SetMinSize((50, 256))
self.window_1_pane_1.SetBackgroundColour(wx.Colour(216, 216, 191))
self.window_1_pane_1.SetScrollRate(10, 10)
self.window_1.SetMinimumPaneSize(20)
sizer_1 = wx.BoxSizer(wx.VERTICAL)
sizer_2 = wx.BoxSizer(wx.HORIZONTAL)
#sizer_2.Add(self.button_1, 0, 0, 0)
sizer1 = wx.BoxSizer(wx.VERTICAL)
sizer1.Add(self.tree, 20, wx.EXPAND)
self.SetSizer(sizer1)
self.window_1_pane_1.SetSizer(sizer_2)
self.window_1.SplitVertically(self.window_1_pane_1, self.window_1_pane_2)
sizer_1.Add(self.window_1, 1, wx.EXPAND, 0)
self.SetSizer(sizer_1)
class TabTwo(wx.Panel):
def __init__(self, parent):
wx.Panel.__init__(self, parent)
t = wx.StaticText(self, -1, "This is the second tab", (20,20))
class TabThree(wx.Panel):
def __init__(self, parent):
wx.Panel.__init__(self, parent)
t = wx.StaticText(self, -1, "This is the third tab", (20,20))
class TabFour(wx.Panel):
def __init__(self, parent):
wx.Panel.__init__(self, parent)
t = wx.StaticText(self, -1, "This is the last tab", (20,20))
class MainFrame(wx.Frame):
def __init__(self):
wx.Frame.__init__(self, None, title="wxPython tabs example #pythonspot.com")
# Create a panel and notebook (tabs holder)
p = wx.Panel(self)
nb = wx.Notebook(p)
# Create the tab windows
tab1 = TabOne(nb)
tab2 = TabTwo(nb)
tab3 = TabThree(nb)
tab4 = TabFour(nb)
# Add the windows to tabs and name them.
nb.AddPage(tab1, "Tab 1")
nb.AddPage(tab2, "Tab 2")
nb.AddPage(tab3, "Tab 3")
nb.AddPage(tab4, "Tab 4")
# Set noteboook in a sizer to create the layout
sizer = wx.BoxSizer()
sizer.Add(nb, 1, wx.EXPAND)
p.SetSizer(sizer)
if __name__ == "__main__":
app = wx.App(redirect=True)
MainFrame().Show()
app.MainLoop()

Answer 1

wx.TreeCtrl has built-in horizontal and vertical scroll bars. Therefore, I guess there is no need to use the wx.ScrolledWindow here. I simplify the code for class TabOne to the following:
class TabOne(wx.Panel):
def __init__(self, parent):
wx.Panel.__init__(self, parent)
self.SetSize((400, 300))
self.window_1 = wx.SplitterWindow(self, wx.ID_ANY)
il = wx.ImageList(16,16)
self.fldridx = il.Add(wx.ArtProvider.GetBitmap(wx.ART_FOLDER, wx.ART_OTHER, (16,16)))
self.fldropenidx = il.Add(wx.ArtProvider.GetBitmap(wx.ART_FILE_OPEN, wx.ART_OTHER, (16,16)))
self.fileidx = il.Add(wx.ArtProvider.GetBitmap(wx.ART_NORMAL_FILE, wx.ART_OTHER, (16,16)))
self.tree = wx.TreeCtrl(self.window_1, style=wx.TR_DEFAULT_STYLE | wx.TR_EDIT_LABELS)
self.tree.AssignImageList(il)
root = self.tree.AddRoot("Server")
self.tree.SetItemData(root, None)
self.tree.SetItemImage(root, self.fldridx,wx.TreeItemIcon_Normal)
self.tree.SetItemImage(root, self.fldropenidx,wx.TreeItemIcon_Expanded)
tree = ["A","B","C","D","E","F","G","H"]
self.AddTreeNodes(root, tree)
self.tree.Expand(root)
self.window_1_pane_2 = wx.Panel(self.window_1, wx.ID_ANY)
self.window_1.SetMinimumPaneSize(20)
self.window_1.SplitVertically(self.tree, self.window_1_pane_2)
sizer_1 = wx.BoxSizer(wx.HORIZONTAL)
sizer_1.Add(self.window_1, 1, wx.EXPAND, 0)
self.SetSizer(sizer_1)
def AddTreeNodes(self, parentItem, items):
for item in items:
if type(item) == str:
newItem = self.tree.AppendItem(parentItem, item)
self.tree.SetItemData(newItem, None)
#self.tree.SetItemImage(newItem, self.fileidx,wx.TreeItemIcon_Normal)
else:
newItem = self.tree.AppendItem(parentItem, item[0])
self.tree.SetItemPyData(newItem, None)
#self.tree.SetItemImage(newItem, self.fldridx,wx.TreeItemIcon_Normal)
self.tree.SetItemImage(newItem, self.fldropenidx,wx.TreeItemIcon_Expanded)
self.AddTreeNodes(newItem, item[1])
and now is working as expected.