How to create a TaskBarIcon-only application in wxpython?

问题

I'm trying to create an application in wxpython that only uses a TaskBarIcon and no frames.

There is a question on this here, but that example doesn't work for me; it just exits with no error.

The code I've written below is a much simplified version of the code I'm working with:

import wx

class Systray_Icon(wx.TaskBarIcon):
    def __init__(self):
        icon = wx.Icon('yellow.ico', wx.BITMAP_TYPE_ICO)
        self.SetIcon(icon, "Test")
        self.Bind(wx.EVT_MENU, self.Destroy(), id=wx.ID_EXIT)

    def CreatePopupMenu(self):
        menu = wx.Menu()
        menu.Append(wx.ID_EXIT, "Quit")
        return menu

app = wx.App()
sysicon = Systray_Icon()
app.MainLoop()

I'm getting the following error:

$ python2 systray.py
Traceback (most recent call last):
  File "systray.py", line 15, in <module>
    sysicon = TaskBarIcon()
  File "systray.py", line 6, in __init__
    self.SetIcon(icon, "Test")
  File "/usr/lib/python2.7/dist-packages/wx-3.0-gtk2/wx/_windows.py", line 2841, in SetIcon
    return _windows_.TaskBarIcon_SetIcon(*args, **kwargs)
TypeError: in method 'TaskBarIcon_SetIcon', expected argument 1 of type 'wxPyTaskBarIcon *'

So, my questions:

1: Why won't SetIcon accept my class? I've tried moving the SetIcon call to a function like in the question I linked, but it still doesn't work. I can fiddle around with it and probably get something to work, but I'd like to know the reason it won't work.

2: The question I linked to runs, but exits immediately. Is that because a TaskBarIcon won't hold MainLoop() open? What can I do about this?

回答1:

OK, figured it out the next day, after 30 minutes of messing about.

SetIcon wasn't accepting my class because I needed to add the following:

super(TaskBarIcon, self).__init__()

to __init__.

I suspect it's duck typing biting me here; without the wx.TaskBarIcon constructor running, python doesn't see it as a wx.TaskBarIcon object.

To keep the application open with only a TaskBarIcon, create a derived class from wx.App and override the OnInit function, like so:

class App(wx.App):
    def OnInit(self):
        self.SetTopWindow(wx.Frame(None, -1))
        TaskBarIcon()
        return True

回答2:

Here is a working sample on Linux with python 2.7 wxpython 2.8:

import wx

TRAY_TOOLTIP = 'System Tray Demo'
TRAY_ICON = '/usr/share/pixmaps/thunderbird.xpm'

def create_menu_item(menu, label, func):
    item = wx.MenuItem(menu, -1, label)
    menu.Bind(wx.EVT_MENU, func, id=item.GetId())
    menu.AppendItem(item)
    return item

class TaskBarIcon(wx.TaskBarIcon):
    def __init__(self):
        wx.TaskBarIcon.__init__(self)
        self.set_icon(TRAY_ICON)
        self.Bind(wx.EVT_TASKBAR_LEFT_DOWN, self.on_left_down)

    def CreatePopupMenu(self):
        menu = wx.Menu()
        create_menu_item(menu, 'Say Hello', self.on_hello)
        menu.AppendSeparator()
        create_menu_item(menu, 'Exit', self.on_exit)
        return menu

    def set_icon(self, path):
        icon = wx.IconFromBitmap(wx.Bitmap(path))
        self.SetIcon(icon, TRAY_TOOLTIP)

    def on_left_down(self, event):
        print 'Tray icon was left-clicked.'

    def on_hello(self, event):
        print 'Hello, world!'

    def on_exit(self, event):
        wx.CallAfter(self.Destroy)

def main():
    app = wx.App()
    TaskBarIcon()
    app.MainLoop()

if __name__ == '__main__':
    main()

EDIT:
For anyone still getting grief this is a version that essentially uses a dummy frame.

Edit 2019: Updated for python3/wxpython 4+

import wx
import wx.adv

TRAY_TOOLTIP = 'System Tray Demo'
TRAY_ICON = '/usr/share/pixmaps/python.xpm'

def create_menu_item(menu, label, func):
    item = wx.MenuItem(menu, -1, label)
    menu.Bind(wx.EVT_MENU, func, id=item.GetId())
    menu.Append(item)
    return item


class TaskBarIcon(wx.adv.TaskBarIcon):
    def __init__(self,frame):
        wx.adv.TaskBarIcon.__init__(self)
        self.myapp_frame = frame
        self.set_icon(TRAY_ICON)
        self.Bind(wx.adv.EVT_TASKBAR_LEFT_DOWN, self.on_left_down)

    def CreatePopupMenu(self):
        menu = wx.Menu()
        create_menu_item(menu, 'Say Hello', self.on_hello)
        menu.AppendSeparator()
        create_menu_item(menu, 'Exit', self.on_exit)
        return menu

    def set_icon(self, path):
        icon = wx.Icon(wx.Bitmap(path))
        self.SetIcon(icon, TRAY_TOOLTIP)

    def on_left_down(self, event):
        print ('Tray icon was left-clicked.')

    def on_hello(self, event):
        print ('Hello, world!')

    def on_exit(self, event):
        self.myapp_frame.Close()

class My_Application(wx.Frame):

    #----------------------------------------------------------------------
    def __init__(self):
        wx.Frame.__init__(self, None, wx.ID_ANY, "", size=(1,1))
        panel = wx.Panel(self)
        self.myapp = TaskBarIcon(self)
        self.Bind(wx.EVT_CLOSE, self.onClose)

    #----------------------------------------------------------------------
    def onClose(self, evt):
        """
        Destroy the taskbar icon and the frame
        """
        self.myapp.RemoveIcon()
        self.myapp.Destroy()
        self.Destroy()

if __name__ == "__main__":
    MyApp = wx.App()
    My_Application()
    MyApp.MainLoop()

来源：https://stackoverflow.com/questions/35542551/how-to-create-a-taskbaricon-only-application-in-wxpython

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