hi, all
I'm having a problem with creating custom events in wxpython.
I have a class A handling some data processing work and another class
B of GUI matter. I need GUI to display information when data in A is
updated.
I know cutom events in wxpython may work. But I found no material
paricularly
helpful
can anyone write me some demo code to show how to do this ...
This example works for me:
import wx
class MyCustomEvent(wx.PyCommandEvent): #or wx.PyEvent
def __init__(self, event_type, id):
wx.PyCommandEvent.__init__(self, event_type, id)
class A(object): #Data Processing class
def __init__(self, widget_to_update):
self.widget_to_update = widget_to_update
#create the custom event:
self.my_event_type = wx.NewEventType()
self.EVT_MY_CUSTOM_EVENT =
wx.PyEventBinder(self.my_event_type, 1)
#Note: you need to make EVT_MY_CUSTOM_EVENT persist so that you
#can refer to it in a later call to Bind()
def process_data(self): #create thread here
finished = True
if finished:
self.update_gui()
def update_gui(self):
#create a custom event object and enter it in the event queue:
my_evt_obj = MyCustomEvent(self.my_event_type,
self.widget_to_update.GetId() )
self.widget_to_update.GetEventHandler().ProcessEvent(my_evt_obj)
class B(object): #Gui class
def __init__(self):
frame = wx.Frame(None, -1, "My Window")
panel = wx.Panel(frame, -1)
button = wx.Button(panel, -1, "Start Data Processing",
pos=(100, 10))
button.Bind(wx.EVT_BUTTON, self.onclick)
self.text_ctrl = wx.TextCtrl(panel, -1, "Hello World",
pos=(100, 50), size=(200, 20))
self.a = A(self.text_ctrl)
frame.Bind(self.a.EVT_MY_CUSTOM_EVENT,
self.on_my_custom_event)
frame.Show()
def onclick(self, event):
self.a.process_data()
def on_my_custom_event(self, event):
self.text_ctrl.SetValue("Finished Processing Data")
app = wx.PySimpleApp(redirect=False)
b = B()
app.MainLoop()
However, I couldn't get similar code to work when I derived the event
class from wx.PyEvent and used Bind() directly on the TextCtrl
(command events propagate up the container hierarchy while regular
events don't):
import wx
class MyCustomEvent(wx.PyEvent): #or wx.PyEvent
def __init__(self, event_type, id):
wx.PyEvent.__init__(self, event_type, id)
class A(object): #Data Processing class
def __init__(self, widget_to_update):
self.widget_to_update = widget_to_update
#create the custom event:
self.my_event_type = wx.NewEventType()
self.EVT_MY_CUSTOM_EVENT =
wx.PyEventBinder(self.my_event_type, 1)
def process_data(self): #create thread here
finished = True
if finished:
self.update_gui()
def update_gui(self):
#create a custom event object and enter it in the event queue:
my_evt_obj = MyCustomEvent(self.my_event_type,
self.widget_to_update.GetId() )
self.widget_to_update.GetEventHandler().ProcessEvent(my_evt_obj)
class B(object): #Gui class
def __init__(self):
frame = wx.Frame(None, -1, "My Window")
panel = wx.Panel(frame, -1)
button = wx.Button(panel, -1, "Start Data Processing",
pos=(100, 10))
button.Bind(wx.EVT_BUTTON, self.onclick)
self.text_ctrl = wx.TextCtrl(panel, -1, "Hello World",
pos=(100, 50), size=(200, 20))
self.a = A(self.text_ctrl)
self.text_ctrl.Bind(self.a.EVT_MY_CUSTOM_EVENT,
self.on_my_custom_event)
frame.Show()
def onclick(self, event):
self.a.process_data()
def on_my_custom_event(self, event):
self.text_ctrl.SetValue("Finished Processing Data")
app = wx.PySimpleApp(redirect=False)
b = B()
app.MainLoop()
