python - wxpython组合框值参数未正确设置初始值

Question

我正在用下面的代码编写一个脚本，但它不起作用，因为设置value参数应该在组合框上设置一个初始值，如代码和图片所示。有人对此有解决方案吗？

self.algorithms = {...}
self.algorithm = wx.ComboBox(self.pnl, value='--Select--', choices=list(self.algorithms.keys()),
                                     style=wx.CB_READONLY)
self.algorithm.SetPosition((50, 80))

标签： pythonwxpythonpython-3.7

Answer 1

keys如果字典中的 是字符串，那应该可以工作。

如果不是，您应该从以下位置收到错误：

choices=list(self.algorithms.keys())

choices应该list是strings

在这种情况下尝试：

choices=[str(k) for k in self.algorithms]

反而。

编辑风格wx.CB_READONLY

字符串必须在组合框选项列表中

这不是其他样式的情况

因此，如果将索引用于该选择，则必须小心

这是一些应该可以工作的简单代码：

import wx

class Myframe(wx.Frame):
    def __init__(self):
        wx.Frame.__init__(self, None)
        self.my_choices = {"Choose a sport":0,"Board Sports":1,"Ball Sports":2,"Fight Sports":3}
        #self.my_choices = ["Board Sports","Ball Sports","Fight Sports"]
        self.my_subchoices = [[],["Skate boarding","Surfing","Ski boarding"],["Football","Cricket","Rugby"],["Boxing","Wrestling","Karate"]]
        pan = wx.Panel(self)
        self.cbx = wx.ComboBox(pan, -1, value = "Choose a sport", pos=(10,30), size=(300,30),choices=list(self.my_choices),style=wx.CB_DROPDOWN | wx.CB_READONLY )
        self.cbx.Bind(wx.EVT_COMBOBOX, self.on_selection)

    def on_selection(self, evt):
        Choice = self.cbx.GetSelection()
        msg = ""
        #
        # Ignore choice 0 because of style wx.CB_READONLY or include a blank entry
        # for choice 0 in my_subchoices
        for x in self.my_subchoices[Choice]:
            msg += x+"\n"
        self.cbx.SetToolTip(msg)

if __name__ == "__main__":
    App = wx.App()
    Myframe().Show()
    App.MainLoop()