拉伸面板以填充整个窗口而不是仅仅是一个角落

Question

当我运行我的wxPython应用程序（下面的代码）时，所有小部件似乎在窗口的左上角聚集在一起。我想要它，以便窗口与sizer的大小完全相同，但我似乎无法得到那个。

这就是我得到的：

这就是我想要的效果，减去糟糕的灰色背景：

有没有办法拉伸父面板以使其填满整个窗口？移除面板似乎给了我我想要的东西，但没有它，整个窗口变成单调的深灰色，从美学的角度来看看起来不自然，所以如果可能的话，我想保留它。

根据wx.version（），我在Python 2.7.6上使用版本3.0.0.0 msw（经典）。

class MyMenu(wx.Frame):

    def __init__(self, parent, id, title):
        super(MyMenu, self).__init__(parent, id, title)

        valid_targets = ["jpg", "gif", "pcx", 
            "msp", "png", "ppm", "tiff"]

        # Cheap Image Converter v .1
        # File to convert: [            ] <Select File>
        # Convert to: [.jpg]v 
        # [CONVERT]

        self.convert_target = None
        self.raw_file = []
        self.panel = wx.Panel(self, -1)

        # all elements will be declared in the order in which
        # they appear, top to bottom, left to right.
        self.intro_text = wx.StaticText(self.panel, -1, "Image Converter v 0.1")

        # Load files button and binding
        self.file_convert_text = wx.StaticText(self.panel, -1,
            "Select a file to convert.")
        self.file_text_box = wx.TextCtrl(self.panel, -1,
            "Select a file!", style=wx.TE_READONLY)
        self.load_file_button = wx.Button(self.panel, -1, "Load Files")
        self.load_file_button.Bind(wx.EVT_BUTTON, self.SelectFileDialog)

        # Conversion type selection box and label
        self.choice_list_desc = wx.StaticText(self.panel, -1,
            "Select format to convert to: ")
        self.choice_list = wx.Choice(self.panel, -1,
            choices=valid_targets)
        self.choice_list.Bind(wx.EVT_CHOICE, 
            self.SelectFromChoice)

        # Convert button!
        self.go_button = wx.Button(self.panel, -1, "Convert!")
        self.go_button.Bind(wx.EVT_BUTTON, self.PerformConversion)

        # sizers!
        self.master_container = wx.GridBagSizer(4, 3)

        self.master_container.Add(self.intro_text, (0,0), (1,3), wx.EXPAND)

        self.master_container.Add(self.file_convert_text, (1,0), wx.DefaultSpan, wx.EXPAND | wx.ALIGN_RIGHT)
        self.master_container.Add(self.file_text_box, (1,1), wx.DefaultSpan, wx.EXPAND | wx.ALIGN_CENTER)
        self.master_container.Add(self.load_file_button, (1,2), wx.DefaultSpan, wx.EXPAND | wx.ALIGN_CENTER)

        self.master_container.Add(self.choice_list_desc, (2,0), wx.DefaultSpan, wx.EXPAND)
        self.master_container.Add(self.choice_list, (2,1), wx.DefaultSpan, wx.EXPAND)

        self.master_container.Add(self.go_button, (3,0), wx.DefaultSpan, wx.EXPAND)

        self.panel.SetSizerAndFit(self.master_container)
        self.Centre()
# callbacks removed for brevity.
class MyApp(wx.App):
    def OnInit(self):
        frame = MyMenu(None, -1, 'Python Bulk Image Converter')
        frame.Show(True)
        return True

if __name__ == "__main__":
    app = MyApp(0)
    app.MainLoop()

Answer 1

这在wxPython中有点令人困惑。就个人而言，我发现Fit和SetSizerAndFit方法非常烦人且不太有用。但是，由于这是您想要的，所以这样做的方法是更改​​代码中的以下行：

self.panel.SetSizerAndFit(self.master_container)

到此：

self.panel.SetSizer(self.master_container)
self.master_container.Fit(self)

这里是完整的代码（注意我注释掉了所有事件绑定，因为这些方法在你的例子中没有出现）：

import wx

class MyMenu(wx.Frame):

    def __init__(self, parent, id, title):
        super(MyMenu, self).__init__(parent, id, title)

        valid_targets = ["jpg", "gif", "pcx", 
            "msp", "png", "ppm", "tiff"]

        # Cheap Image Converter v .1
        # File to convert: [            ] <Select File>
        # Convert to: [.jpg]v 
        # [CONVERT]

        self.convert_target = None
        self.raw_file = []
        self.panel = wx.Panel(self, -1)

        # all elements will be declared in the order in which
        # they appear, top to bottom, left to right.
        self.intro_text = wx.StaticText(self.panel, -1, "Image Converter v 0.1")

        # Load files button and binding
        self.file_convert_text = wx.StaticText(self.panel, -1,
            "Select a file to convert.")
        self.file_text_box = wx.TextCtrl(self.panel, -1,
            "Select a file!", style=wx.TE_READONLY)
        self.load_file_button = wx.Button(self.panel, -1, "Load Files")
        #self.load_file_button.Bind(wx.EVT_BUTTON, self.SelectFileDialog)

        # Conversion type selection box and label
        self.choice_list_desc = wx.StaticText(self.panel, -1,
            "Select format to convert to: ")
        self.choice_list = wx.Choice(self.panel, -1,
            choices=valid_targets)
        #self.choice_list.Bind(wx.EVT_CHOICE, 
            #self.SelectFromChoice)

        # Convert button!
        self.go_button = wx.Button(self.panel, -1, "Convert!")
        #self.go_button.Bind(wx.EVT_BUTTON, self.PerformConversion)

        # sizers!
        self.master_container = wx.GridBagSizer(4, 3)

        self.master_container.Add(self.intro_text, (0,0), (1,3), wx.EXPAND)

        self.master_container.Add(self.file_convert_text, (1,0), wx.DefaultSpan, wx.EXPAND | wx.ALIGN_RIGHT)
        self.master_container.Add(self.file_text_box, (1,1), wx.DefaultSpan, wx.EXPAND | wx.ALIGN_CENTER)
        self.master_container.Add(self.load_file_button, (1,2), wx.DefaultSpan, wx.EXPAND | wx.ALIGN_CENTER)

        self.master_container.Add(self.choice_list_desc, (2,0), wx.DefaultSpan, wx.EXPAND)
        self.master_container.Add(self.choice_list, (2,1), wx.DefaultSpan, wx.EXPAND)

        self.master_container.Add(self.go_button, (3,0), wx.DefaultSpan, wx.EXPAND)

        self.panel.Layout()
        self.panel.SetSizer(self.master_container)
        self.master_container.Fit(self)

        self.Centre()

# callbacks removed for brevity.
class MyApp(wx.App):
    def OnInit(self):
        frame = MyMenu(None, -1, 'Python Bulk Image Converter')
        frame.Show(True)
        return True

if __name__ == "__main__":
    app = MyApp(0)
    app.MainLoop()

此代码在Xubuntu 14.04，wxPython 2.8.12.1和Python 2.7上进行了测试