想要使用wxpython添加一個文本框和按鈕和靜態字段在屏幕中心的圖像？幫助我不要重疊和放置

Question

我正在學習ui python並嘗試使用wxpython進行UI開發（也沒有UI exp）。我已經能夠創建一個面板，一個按鈕和一個文本輸入框的框架。我想把所有這些放在屏幕的中心位置，以便我可以實現其餘的功能。目前他們是重疊的

class KartScan(wx.Panel): 
     """ create a panel with a canvas to draw on""" 
     def __init__(self, parent): 
      wx.Panel.__init__(self, parent, wx.ID_ANY) 
      # pick a .jpg, .png, .gif, or .bmp wallpaper image file you 
      # have in the working folder or give full path 
      image_file = 'index.png' 
      self.bmp = wx.Bitmap(image_file) 
      # this 50ms delay is needed to allow image loading first 
      # may have to increase delay for very large images 
      wx.FutureCall(50, self.make_canvas) 
      # react to a resize event and redraw image 
      wx.EVT_SIZE(self, self.make_canvas) 
      # now put a button on the panel, on top of the wallpaper 
      sizer = wx.GridBagSizer() 

      self.entry = wx.TextCtrl(self, -1, value=u"Enter Waybill No.") 
      sizer.Add(self.entry, (0, 0), (1, 1), wx.EXPAND) 
      self.Bind(wx.EVT_TEXT_ENTER, self.OnPressEnter, self.entry) 

      button = wx.Button(self, -1, label="Add or Compare") 
      sizer.Add(button, (0, 1)) 
      self.Bind(wx.EVT_BUTTON, self.OnButtonClick, button) 

      self.label = wx.StaticText(self, -1, label=u'This App is used !') 
      self.label.SetBackgroundColour(wx.WHITE) 
      self.label.SetForegroundColour(wx.BLUE) 
      sizer.Add(self.label, (1, 0), (1, 2), wx.EXPAND) 

      sizer.AddGrowableCol(0) 
      self.SetSizerAndFit(sizer) 
      self.SetSizeHints(-1, self.GetSize().y, -1, self.GetSize().y) 
      self.entry.SetFocus() 
      self.entry.SetSelection(-1, -1) 
      self.Show(True) 

     def make_canvas(self, event=None): 
      # create the paint canvas 
      dc = wx.ClientDC(self) 
      # forms a wall-papered background 
      # formed from repeating image tiles 
      brush_bmp = wx.BrushFromBitmap(self.bmp) 
      dc.SetBrush(brush_bmp) 
      # draw a rectangle to fill the canvas area 
      w, h = self.GetClientSize() 
      dc.DrawRectangle(0, 0, w, h) 

     def OnButtonClick(self, event): 
      self.label.SetLabel(self.entry.GetValue() + " You clicked the button !") 
      self.entry.SetFocus() 
      self.entry.SetSelection(-1, -1) 
    on click events 
     def OnPressEnter(self, event): 
      self.label.SetLabel(self.entry.GetValue() + " You pressed enter !") 
      self.entry.SetFocus() 
      self.entry.SetSelection(-1, -1) 

Answer 1

大小測定器做在窗口的EVT_SIZE事件的佈置工作。既然你爲自己的事情攔截了這個事件，那麼除非你有幫助，否則sizer將沒有機會去完成它的工作。

這樣做的一種方法是在大小事件處理程序中調用self.Layout()。另一種方法是致電event.Skip()，它會告訴wx事件應該在處理程序返回後繼續處理。這允許窗口的默認大小處理程序仍然可以獲取事件並執行佈局，還可能根據窗口類的類型進行其他操作。