Update/Refresh Dynamically–Created WxPython Widgets

Question

New python programmer here and trying to learn how to dynamically update widgets. To start, I have the following code. What I would like to do is change my variable "self.dynamiclength" to any integer, and have WxPython update the number of widgets appropriately. I have tried putting self.Refresh() and self.Update() in my TestFrame after updating self.dynamiclength to no avail. I have done as much reading as possible on this before resorting to asking for help, but I am just too new at Wx to solve this one on my own. Thank you much! ``` import wx import wx.lib.scrolledpanel as scrolled class TestFrame(wx.Frame): def __init__(self): wx.Frame.__init__(self, None, size=(1000, 550)) panel = wx.Panel(self) mainSizer = wx.BoxSizer(wx.VERTICAL) pbox0 = wx.BoxSizer(wx.VERTICAL) controlback0 = wx.Button(panel, label="Back0") controlforward0 = wx.Button(panel, label="Forward0") pbox0.Add(controlback0, 0, wx.ALL) pbox0.Add(controlforward0, 0, wx.ALL) mainSizer.Add(pbox0) self.scrolling_window =…

Accepted Answer

I have similar test code which I have written some time ago. Maybe you will find it useful.

```
import wx

#===================================================================================================
class UpperPanel(wx.Panel):
    def __init__(self, *args, **kwargs):
        wx.Panel.__init__(self, *args, **kwargs)
        self.combo = wx.ComboBox(self, choices=["0", "1", "2", "3", "4"], size=(200, -1))
        self.combo.Bind(wx.EVT_COMBOBOX, self.GetParent().middlePanel.Change)
        self.logo = wx.Button(self, size=(300, 100))

self.sizer = wx.BoxSizer()
        self.sizer.Add(self.combo, 0, wx.EXPAND)
        self.sizer.Add(self.logo, 0, wx.EXPAND)

self.SetSizerAndFit(self.sizer)

#===================================================================================================
class MiddlePanel(wx.Panel):
    def __init__(self, *args, **kwargs):
        wx.Panel.__init__(self, *args, **kwargs)
        self.subs = []
        self.sizer = wx.BoxSizer(wx.VERTICAL)
        self.SetSizerAndFit(self.sizer)

def Change(self, e):
        self.sizer = wx.BoxSizer(wx.VERTICAL)

for a in self.subs:
            a.Destroy()

self.subs = []

for a in range(int(e.GetString())):
            b = wx.Button(self, size=(-1, 50))
            self.subs.append(b)
            self.sizer.Add(b, 1, wx.EXPAND)

self.SetSizerAndFit(self.sizer)
        self.GetParent().Fit()

#===================================================================================================
class MainWin(wx.Frame):
    def __init__(self):
        wx.Frame.__init__(self, None)

self.middlePanel = MiddlePanel(self)
        self.upperPanel = UpperPanel(self)
        self.textArea = wx.TextCtrl(self, size=(-1, 300), style=wx.TE_MULTILINE)

self.sizer = wx.BoxSizer(wx.VERTICAL)
        self.sizer.Add(self.upperPanel, 0, wx.EXPAND)
        self.sizer.Add(self.middlePanel, 0, wx.EXPAND)
        self.sizer.Add(self.textArea, 1, wx.EXPAND)

self.SetSizerAndFit(self.sizer)

#===================================================================================================
if __name__ == '__main__':
    app = wx.PySimpleApp()
    main_win = MainWin()
    main_win.Show()
    app.MainLoop()
```

Update/Refresh Dynamically–Created WxPython Widgets

Solution

Problem