python - wxpython 无法捕获 EVT_KEY_DOWN enent

Question

我无法捕获 EVT_KEY_DOWN 事件。但是可以捕获EVT_KEY_UP。
Python版本: 2.7.3
wxPython 版本: 2.8.12.1 (gtk2-unicode)
系统信息: Mint 14 Nadia，Linux 3.5.0-17-generic(x86_64)
以下是我的代码

#!/usr/bin/env python

import sys, os
import wx
class  WinFrame(wx.Frame):
    def __init__(self, parent, title):
        super(WinFrame, self).__init__(parent, 
                                       title=title,
                                       size=(400,400))
        self.panel = wx.Panel(self,-1, size=(400,400))
        self.panel.Bind(wx.EVT_KEY_DOWN, self.OnKeyDown)
        self.panel.Bind(wx.EVT_KEY_UP, self.OnKeyUp)
    def OnKeyUp(self, event):
        print 'up'

    def OnKeyDown(self, event):
        print 'down'

class PicSampleApp(wx.App):
    def __init__(self):
        super(PicSampleApp, self).__init__(0)

    def createFrame(self):
        self.frame = WinFrame(None, "test")
        self.frame.Show(True)
        self.SetTopWindow(self.frame)


app = PicSampleApp()
app.createFrame()
app.MainLoop()

Answer 1

我在捕获 wx.EVT_KEY_DOWN 和 wx.EVT_KEY_UP 时总是遇到问题。原因的解释让我有点难以理解，但我知道切换到 EVT_CHAR_HOOK 通常对我有用。尝试这样的事情:

#!/usr/bin/env python

import sys, os
import wx
class  WinFrame(wx.Frame):
    def __init__(self, parent, title):
        super(WinFrame, self).__init__(parent, 
                                       title=title,
                                       size=(400,400))
        self.panel = wx.Panel(self,-1, size=(400,400))
        self.panel.Bind(wx.EVT_CHAR_HOOK, self.OnKeyPress)

    def OnKeyPress(self, event):
        keyCode = event.GetKeyCode()
        if keyCode == wx.WXK_DOWN:
            print 'down'
        elif keyCode == wx.WXK_UP:
            print 'up'

class PicSampleApp(wx.App):
    def __init__(self):
        super(PicSampleApp, self).__init__(0)

    def createFrame(self):
        self.frame = WinFrame(None, "test")
        self.frame.Show(True)
        self.SetTopWindow(self.frame)

app = PicSampleApp()
app.createFrame()
app.MainLoop()

如果您希望事件继续传播，您可能还想将 event.Skip() 放在 OnKeyPress 的底部。