size of panel in panel using wxPython incorrect

Question

I have a problem with wxPython. I have a frame and in that frame, I have a panel. In that panel, I want another panel of fixed size (100x100). My code is below:

import wx

class TestPanel(wx.Panel):
    def __init__(self, *args, **kwargs):
        wx.Panel.__init__(self, *args, **kwargs)
        self.SetBackgroundColour(wx.RED)
        self.SetSize((100, 100))


class ExampleFrame(wx.Frame):
    def __init__(self, parent):
        wx.Frame.__init__(self, parent)

        self.panel = wx.Panel(self)
        self.panel.SetMinSize((-1, -1))
        self.panel.SetBackgroundColour(wx.WHITE)

        self.filesize = TestPanel(self.panel, -1)

        hSizer = wx.BoxSizer(wx.HORIZONTAL)
        hSizer.Add(self.filesize, 0, wx.CENTER)

        vSizer = wx.BoxSizer(wx.VERTICAL)
        vSizer.Add(hSizer, 1, wx.EXPAND)
        self.panel.SetSizer(vSizer)


app = wx.App(False)
frame = ExampleFrame(None)
frame.Show()
app.MainLoop()

When I run the program, my TestPanel widget is only 1x1 pixels. However, when I print the size using the GetSize method, it says that the size is 100x100. Why does it display as a 1x1 red block in this case?

I'm using wxPython 3.0.2.0 on OS X.

Answer 1

I'm not sure why SetSize() doesn't work, but you can just pass the size to the constructor. That worked for me on Windows 7 with wxPython 3.0.2 where calling SetSize did not.

import wx

class TestPanel(wx.Panel):
    def __init__(self, *args, **kwargs):
        wx.Panel.__init__(self, size=(100, 100), *args)
        self.SetBackgroundColour('red')
        self.Layout()


class ExampleFrame(wx.Frame):
    def __init__(self, parent):
        wx.Frame.__init__(self, parent)

        self.panel = wx.Panel(self)
        self.panel.SetMinSize((-1, -1))
        self.panel.SetBackgroundColour(wx.WHITE)

        self.filesize = TestPanel(self.panel, -1)

        hSizer = wx.BoxSizer(wx.HORIZONTAL)
        hSizer.Add(self.filesize, 0, wx.CENTER)

        vSizer = wx.BoxSizer(wx.VERTICAL)
        vSizer.Add(hSizer, 1, wx.EXPAND)
        self.panel.SetSizer(vSizer)

import wx.lib.inspection
app = wx.App(False)
frame = ExampleFrame(None)
frame.Show()
wx.lib.inspection.InspectionTool().Show()
app.MainLoop()