Question

我希望我的wxPython应用程序在文本输入窗口小部件失去焦点时触发事件。我已经按照教程here进行了操作，该教程描述了使用wx.EVT_KILL_FOCUS。但是，我的行为出乎意料。

以下代码可以正常使用：

import wx

class MyForm(wx.Frame):
    def __init__(self):
        wx.Frame.__init__(self, None, wx.ID_ANY, "Focus Tutorial 1a")
        panel = wx.Panel(self, wx.ID_ANY)
        txt = wx.TextCtrl(panel, wx.ID_ANY, "")

        txt.Bind(wx.EVT_KILL_FOCUS, self.onTextKillFocus)
        """
        This next line seems to be important for working correctly,
        but I don't understand why:
        """
        txt.Bind(wx.EVT_SET_FOCUS, self.onTextFocus)

        btn = wx.Button(panel, wx.ID_ANY, "Test")

        sizer = wx.BoxSizer(wx.VERTICAL)
        sizer.Add(txt, 0, wx.ALL, 5)
        sizer.Add(btn, 0, wx.ALL, 5)
        panel.SetSizer(sizer)

    def onTextFocus(self, event):
        print "text received focus!"

    def onTextKillFocus(self, event):
        print "text lost focus!"

if __name__ == '__main__':
    app = wx.App()
    frame = MyForm().Show()
    app.MainLoop()

当我从文本控件到按钮来回切换，或者单击或退出文本控件时，我会得到我期望的焦点消息。

然而，当我进行以下（合理？）编辑时，事情就会向南发展：

import wx

class MyForm(wx.Frame):
    def __init__(self):
        wx.Frame.__init__(self, None, wx.ID_ANY, "Focus Tutorial 1a")
        panel = wx.Panel(self, wx.ID_ANY)
        txt = wx.TextCtrl(panel, wx.ID_ANY, "")

        txt.Bind(wx.EVT_KILL_FOCUS, self.onTextKillFocus)
        """
        This next line seems to be important for working correctly,
        but I don't understand why:
        """
##        txt.Bind(wx.EVT_SET_FOCUS, self.onTextFocus)

        btn = wx.Button(panel, wx.ID_ANY, "Test")

        sizer = wx.BoxSizer(wx.VERTICAL)
        sizer.Add(txt, 0, wx.ALL, 5)
        sizer.Add(btn, 0, wx.ALL, 5)
        panel.SetSizer(sizer)

    def onTextFocus(self, event):
        print "text received focus!"

    def onTextKillFocus(self, event):
        print "text lost focus!"

if __name__ == '__main__':
    app = wx.App()
    frame = MyForm().Show()
    app.MainLoop()

出乎意料的行为是，当我尝试将焦点从文本框更改为其他任何内容（标签或鼠标点击）时，'text lost focus!'消息会打印一次，而不会再打印，我再也无法编辑内容文本控制。

这是预期的行为吗？如果没有，我做错了什么？

Python版本2.7，wxPython版本3.0.0.0，Windows 7 64位

Answer 1

正如wxEvent::Skip()文档中所述，您几乎总是将其称为非命令事件，因为您不想阻止默认处理发生。

为什么这种使用wxPython的EVT_KILL_FOCUS出乎意料？

1 个答案: