wxPython：如果破坏模式对话框，使用 wx.PostEvent 设置焦点不起作用

Question

在模式对话框被销毁后，我无法设置按钮的焦点。

我可以调用来销毁模态对话框或阻止它成为模态然后销毁它吗？

当 wx.PostEvent 触发一个事件时，它会强制在模式对话框上进行 Destroy，但是据我了解，它不会立即被销毁，这意味着当我执行 SetFocus() 时按钮仍然被禁用。

import wx
import wx.lib.newevent
from threading import Thread
import time
processFinishes, EVT_PROCESS_FINISHES = wx.lib.newevent.NewEvent()

class Dummy(Thread):
    def __init__(self, arg):
        super(Dummy, self).__init__()
        self.arg = arg

    def run(self):
        time.sleep(15)
        print "Posting"
        wx.PostEvent(self.arg , processFinishes(result=(None)))


class MyRegion(wx.Frame):
    def __init__(self, parent):
        wx.Frame.__init__(self, parent)
        self.button = wx.Button(self, label="Click me!")
        self.mybutton2 = wx.Button(self, label="I should have focus!!!")
        sizer = wx.BoxSizer(wx.VERTICAL)
        sizer.Add(self.button, 0, wx.ALL)
        sizer.Add(self.mybutton2, 0, wx.ALL)
        self.SetSizerAndFit(sizer)
        self.Bind(wx.EVT_BUTTON, self.OnButton)
        self.Bind(EVT_PROCESS_FINISHES, self.OnFinish)
        self.progress = None
        self.t = Dummy(self)

    def OnButton(self, event):
        self.progress = wx.ProgressDialog("Processing",
                                          "Please wait while the processing finishes.")
        self.progress.Pulse()
        self.progress.ShowModal()
        self.t.start()

    def OnFinish(self, _event):
        print "destroyed"
        self.progress.Destroy()
        print "now setting foucs"
        self.mybutton2.SetFocus()

if __name__ == "__main__":
    app = wx.App()
    frame = MyRegion(None)
    frame.Show()
    app.MainLoop()

编辑：

当试图阻止进度对话框成为模态时，以下代码给出错误，表明 ProgressDialog 不是模态的，而它显然是：

    .....
    def OnButton(self, event):
        # wx.ProgressDialog can also be created with
        # style=wx.wx.PD_APP_MODAL which cannot be made non-modal later on
        # i.e. EndModal() does not work
        self.progress = wx.ProgressDialog("Processing",
                                          "Please wait while the processing finishes.")
        self.progress.Pulse()
        self.progress.ShowModal()
        self.t.start()

    def OnFinish(self, _event):
        print "destroyed"
        # By changing this line
        # wx complains indicating that the progress dialog
        # is not modal whereas a ShowModal was used

        self.progress.EndModal(0) # -> produces a "wx._core.PyAssertionError: C++ assertion "IsModal()" failed at ..\..\src\msw\dialog.cpp(221) in wxDialog::EndModal(): EndModal() called for non modal dialog"
        print "now setting foucs"
        self.mybutton2.SetFocus()

Answer 1

模态对话框在ShowModal() 返回时重新启用所有内容，因此只需直接从OnButton() 调用OnFinish()。

但是请注意，wxProgressDialog 根本不是一个模态对话框（如果它是你将无法调用 Update() 的话，那将毫无用处！），所以在这种情况下你应该直接销毁当你完成它时它（或使用wxPD_AUTO_HIDE 风格告诉它在达到最大进度值时自行消失）。