为什么这个 wxPython 框架（和里面的面板）不能保持它的大小？

Question

面板的背景颜色应用于整个框架！为什么会这样，我想知道。在这里，frame 是 (300,400)，而 panel 应该是 (300,180)。我可能做错了什么。

#!/usr/bin/env python
#-*- coding:utf-8 -*-

import wx

class Panel(wx.Panel):
    def __init__(self, parent, id, pos, size):
        wx.Panel.__init__(self, parent, id, pos, size) 

class Frame(wx.Frame):
    def __init__(self, parent, id, title, pos, size, style):
        wx.Frame.__init__(self, parent, id, title, pos, size, style)
        self.userpanel = Panel(self, -1, (0,0), (300,180))
        self.userpanel.SetBackgroundColour('Gold')


class Application(wx.App):
    def __init__(self):
        wx.App.__init__(self)
        frame = Frame(None, -1, "Internet Login Tool", (-1,-1), (300,400),\
        wx.DEFAULT_FRAME_STYLE ^ (wx.RESIZE_BORDER | wx.MAXIMIZE_BOX))
        frame.Show()
        self.SetTopWindow(frame)

if __name__ == '__main__':
    app = Application()
    app.MainLoop()

Answer 1

当您将面板添加到框架时，它会占用框架的整个区域，将面板添加到框架，然后将面板添加到框架面板，如下面修改后的代码所示

import wx

class Panel(wx.Panel):
    def __init__(self, parent, id, pos, size):
        wx.Panel.__init__(self, parent, id, pos, size) 

class Frame(wx.Frame):
    def __init__(self, parent, id, title, pos, size, style):
        wx.Frame.__init__(self, parent, id, title, pos, size, style)
        framePanel = wx.Panel(self)
        self.userpanel = Panel(framePanel, -1, (0,0), (300,180))
        self.userpanel.SetBackgroundColour('Gold')


class Application(wx.App):
    def __init__(self):
        wx.App.__init__(self)
        frame = Frame(None, -1, "Internet Login Tool", (-1,-1), (300,400),\
        wx.DEFAULT_FRAME_STYLE ^ (wx.RESIZE_BORDER | wx.MAXIMIZE_BOX))
        frame.Show()
        self.SetTopWindow(frame)

if __name__ == '__main__':
    app = Application()
    app.MainLoop()