wxPython:Notebook似乎不适用于多绑定

Question

我正在尝试创建一个wxPython应用程序。为了简化我的设置，假设我有一个左面板和一个右面板。左侧面板有我的控件，它们是滑块/按钮等。右侧面板包括一个笔记本，在每个选项卡中，我都会显示从图像数据列表中获取的视频帧。如果我不使用笔记本，一切都很好，控制事件会改变右侧面板的功能。然而，当我实现笔记本时，考虑到笔记本内每个面板和每个控件的多绑定，我会得到一些奇怪的行为。结果是，每个控件似乎都有不同的父级，因此我不能将同一类(！！)中的变量从一个方法传递到另一个方法。由于问题的复杂性，我无法解释结果。以下是一个示例：

import wx
import numpy as np

def checkclass(obj, clas):
if isinstance(obj, clas) or issubclass(obj.__class__, clas):
return 1
else:
return 0

def wx_generic_binder(widget, function):
'''
TextCtrl(wx.EVT_TEXT) and Slider(wx.EVT_SLIDER) are supported for now.
'''
if widget is not None:
if checkclass(widget, wx.TextCtrl):
widget.Bind(wx.EVT_TEXT, function)
elif checkclass(widget, wx.Slider):
widget.Bind(wx.EVT_SLIDER, function)
else:
raise NotImplementedError
class TopicsNotebook(wx.Notebook):
def __init__(self, parent, forced_frame_handler):
wx.Notebook.__init__(self, parent)
self.pages = []
for count in range(3):
self.pages.append(VideoPanel(self,forced_frame_handler))
self.AddPage(self.pages[-1], str(count))
class VideoPanel(wx.Panel):
'''
A video panel implementation
'''
def __init__(self, parent,  forced_frame_handler):
'''
data is a list of frames. If a frame is missing,
the entry is None
'''
wx.Panel.__init__(self, parent, wx.NewId())
self.forced_frame_handler = forced_frame_handler
wx_generic_binder(self.forced_frame_handler,
lambda event: self.handle_forced(event, self)
)
self.forced = 0
print 'from __init__', id(self)
self.SetBackgroundStyle(wx.BG_STYLE_CUSTOM)
self.Bind(wx.EVT_PAINT, self.on_playing)
wx.CallLater(200, self.SetFocus)
self.img = None

def handle_forced(self, event, parent):
self.count = self.forced_frame_handler.GetValue()
self.forced = 1
print 'from handle_forced', id(self)
self.on_playing(None)
def on_playing(self, event):
print 'from on_playing', id(self)

class MainFrame(wx.Frame):
'''
Main Processing Window
'''
def __init__(self, parent, id_, title):
wx.Frame.__init__(self, parent, id_, title)
self.main_panel = wx.Panel(self, wx.NewId())
self.lft_box = wx.BoxSizer(wx.VERTICAL)
self.slider_min = wx.Slider(self.main_panel, -1, 0, 0,
99, size=(600, -1),
style=wx.SL_VALUE_LABEL)
self.lft_box.Add(self.slider_min)
self.rgt_box = wx.BoxSizer(wx.VERTICAL)
self.nb = TopicsNotebook(self, forced_frame_handler=self.slider_min)
self.rgt_box.Add(self.nb, 1, wx.EXPAND | wx.ALL)
self.main_panel.Fit()
self.main_box = wx.BoxSizer(wx.HORIZONTAL)
self.main_box.AddMany([(self.lft_box, 1),
(self.rgt_box, 1)])
self.SetSizerAndFit(self.main_box)
wx.CallLater(200, self.SetFocus)
def main():
'''
main function
'''
app = wx.App(0)
frame = MainFrame(None , -1, 'Data Mining')
frame.Show(True)
app.MainLoop()
main()

结果是：(如果有人移动滑块)

from __init__ 139699098836624
from __init__ 139699098836016
from __init__ 139699098624232
from on_playing 139699098836624
from on_playing 139699098836624
from on_playing 139699098836624
from handle_forced 139699098624232
from on_playing 139699098624232
from handle_forced 139699098624232
from on_playing 139699098624232
from handle_forced 139699098624232
from on_playing 139699098624232
from handle_forced 139699098624232
from on_playing 139699098624232
from handle_forced 139699098624232
from on_playing 139699098624232

可以看出，在调用(？？)的所有时间内，on\yplaying都具有相同的id，而不遵守initid。handle_forced在one_playing的三个第一次调用之后调用occurrence，这就是为什么我得到相同的id。从3个不同的handle_forceed实例中得到3个这样的occurrences是正常的，但我只得到最后一个。总而言之，id是一团糟的，每个处理程序只有一个(随机？)绑定要设置。任何有足够耐心的人都欢迎给我解释。非常感谢。

Answer 1

您基本上将同一事件类型绑定到同一个小部件3次。当事件发生时，系统会查找绑定，调用它找到的第一个绑定，然后假设它已经完成并返回。如果希望系统继续查找匹配的绑定，则需要在处理程序函数中调用event.Skip()。