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POWhy don't nested sizers expand in wxPython if hidden at init?
 

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  1. POWhy don't nested sizers expand in wxPython if hidden at init?
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    <p>I am trying to build a 3-panel GUI and everything was going great until I tried to nest panels/windows inside of other panels and hide them upon GUI startup. </p> <p>See this image... The yellow/green/blue boxes were automatically expanded to fill up their panels during init, but the little purple box is built BUT then hidden during wx.Panel init until a 2 second timer expires and then at that time that object's Show() method is invoked. At that time it does not not fill up the containing panel. It seems that hiding a panel during init causes the panel sizer to pick the default size, 20x20. </p> <p><img src="https://i.imgur.com/pStOp5g.jpg" alt="sizer test"></p> <p>Here is the code:</p> <pre><code>import wx import wx.lib.scrolledpanel as scrolled class NavPanel(wx.Panel): """""" def __init__(self, parent, actionPanel): """Constructor""" wx.Panel.__init__(self, parent) #, size=(200,600)) self.actionPanel = actionPanel self.SetBackgroundColour("Yellow") class ActionPanel(wx.Panel): """""" def __init__(self, parent, target_item=None): """Constructor""" wx.Panel.__init__(self, parent) self.SetBackgroundColour("Green") self.sc = NestedScrolledActionPanel(self) sizer = wx.BoxSizer(wx.HORIZONTAL) sizer.Add(self.sc, 1, wx.EXPAND) self.SetSizer(sizer) def show_child(self): # Putting a sizer here doesn't work either... self.sc.Show() class NestedScrolledActionPanel(wx.ScrolledWindow): """""" def __init__(self, parent, target_item=None): """Constructor""" wx.ScrolledWindow.__init__(self, parent) self.SetBackgroundColour("Purple") # I don't want to show this at starutp, but hiding it causes the sizer to startup at 20x20! # Comment out this line and the sizer set in ActionPanel works, but you see it at startup self.Hide() class ConsolePanel(scrolled.ScrolledPanel): """""" def __init__(self, parent): """Constructor""" scrolled.ScrolledPanel.__init__(self, parent, -1) self.SetBackgroundColour("Blue") class MainPanel(wx.Panel): """""" def __init__(self, parent): """Constructor""" wx.Panel.__init__(self, parent) mainSplitter = wx.SplitterWindow(self) topSplitter = wx.SplitterWindow(mainSplitter) self.rightPanel = ActionPanel(topSplitter) self.rightPanel.SetBackgroundColour("Green") leftPanel = NavPanel(topSplitter, self.rightPanel) leftPanel.SetBackgroundColour("Yellow") topSplitter.SplitVertically(leftPanel, self.rightPanel, sashPosition=0) topSplitter.SetMinimumPaneSize(200) bottomPanel = ConsolePanel(mainSplitter) mainSplitter.SplitHorizontally(topSplitter, bottomPanel, sashPosition=400) mainSplitter.SetSashGravity(1) sizer = wx.BoxSizer(wx.HORIZONTAL) sizer.Add(mainSplitter, 1, wx.EXPAND) self.SetSizer(sizer) return ######################################################################## class MainFrame(wx.Frame): """""" def __init__(self): """Constructor""" wx.Frame.__init__(self, None, title="Sizer Test", size=(800,600)) self.panel = MainPanel(self) self.Centre() self.Show() self.timer = wx.Timer(self) self.Bind(wx.EVT_TIMER, self.OnTimer, self.timer) self.timer.Start(2000) def OnTimer(self, e): self.panel.rightPanel.show_child() if __name__ == '__main__': app = wx.App(redirect=False) print "Launching frame" frame = MainFrame() print "starting mainloop" app.MainLoop() </code></pre> <p>The reason why I want this panel hidden upon GUI startup is because I will have many different panels residing in that ActionPanel space (the green box) and when the user clicks on a tree node in the yellow box, the panel that is displayed in the green box will be hidden and a different panel will be shown. If I don't hide all of the panels at startup, they are "stacked" on top of each other and I will have to set a timer to go through and hide them all at some point after GUI launches??? That seems hokey. How else can I do it?</p>
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