Event between tabs in wxPython's wx.Notebook

Question

I am trying to create two tabs using wxPython's wx.Notebook; however I am having difficulty to understand where I should put the Bind() if the button and the ListBox are in different tabs.

Here is how my code looks like: It has class TabOne, and TabTwo, both of wx.Panel. The class enrollment is a wx.Frame that uses TabOne and TabTwo as panels.

class TabOne(wx.Panel):
    def __init__(self,parent):
        wx.Panel.__init__(self, parent)
        btn = wx.Button(self, 1, "Add", (120,110))

class TabTwo(wx.Panel):
    def __init__(self,parent):
        wx.Panel.__init__(self, parent)
        lst = wx.ListBox(self, 1, (40,40))

class enrollment(wx.Frame):
    def __init__(self, *args, **kargs):
        super(enrollment, self).__init__(*args, **kargs)

        panel = wx.Panel(self)
        nb = wx.Notebook(panel)

        tab1 = TabOne(nb)
        tab2 = TabTwo(nb)

        nb.AddPage(tab1, "Button")
        nb.AddPage(tab2, "ListBox")

        sizer = wx.BoxSizer()

        sizer.Add(nb, 1, wx.EXPAND)
        panel.SetSizer(sizer)

        self.Show(True)

def main():
    app = wx.App()
    enrollment(None)
    app.MainLoop()

if __name__ = '__main__':
    main()  

Just like to know if I want to add a Bind() for btn in TabOne in order to it to update the ListBox in TabTwo, where should I add the definition for it? I am at a loss at the moment. Thanks Guys.

Answer 1

There are different ways that you can organize it. The binding of a button is one thing and the action you take inside the handler is another. My approach would be to let the enrollment class handle binding and the action because it knows about both of the tabs. You would not want to create a dependency between TabOne and TabTwo.

class TabOne(wx.Panel):
    def __init__(self, parent):
        wx.Panel.__init__(self, parent)
        self.btn = wx.Button(self, 1, "Add", (120,110))

    def BindButton(self, handler):
        # let users of TabOne to register their button handler
        self.btn.Bind(wx.EVT_BUTTON, handler)

class TabTwo(wx.Panel):
    def __init__(self,parent):
        wx.Panel.__init__(self, parent)
        self.lst = wx.ListBox(self, 1, (40,40))

    def InformButtonClicked(self):
        # signal to TabTwo about the button click
        self.lst.Append("Item")

class enrollment(wx.Frame):
    def __init__(self, *args, **kargs):
        super(enrollment, self).__init__(*args, **kargs)

        panel = wx.Panel(self)
        nb = wx.Notebook(panel)

        self.tab1 = TabOne(nb)
        self.tab2 = TabTwo(nb)
        # register your button handler
        self.tab1.BindButton(self.button_handler)

        nb.AddPage(self.tab1, "Button")
        nb.AddPage(self.tab2, "ListBox")

        sizer = wx.BoxSizer()

        sizer.Add(nb, 1, wx.EXPAND)
        panel.SetSizer(sizer)

        self.Show(True)

    def button_handler(self, evt):
        # this method gets called when the button is clicked
        self.tab2.InformButtonClicked()