将其他小部件放在gtk.Menu中

Question

我希望能够在我的gtk.Menu中放置一个gtk.ProgressBar，但由于菜单只需要gtk.MenuItems及其子类，我所做的就是采用普通的gtk.MenuItem并尝试添加我作为一个孩子的进度条。由于gtk.MenuItem是gtk.Bin的子类，因此它应该能够容纳任何小部件。

示例：

menu = gtk.Menu()

item = gtk.MenuItem()

button = gtk.ProgressBar()
button.pulse()
button.show()

item.add(button)
item.show()

menu.append(item)

如果没有pygtk抱怨，这运行得很好。但是，我的进度条根本没有显示：

如果我用gtk.Label替换进度条，它显示就好了。

现在回答我的问题：

1. 我如何知道它将采用哪些小部件？
2. 如何欺骗它让我把其他小部件放在那里？

Answer 1

这是Ubuntu应用程序指标的限制，请参阅this question at askubuntu。

Answer 2

您的示例代码在这里工作（我通过修改我将在下面粘贴的pygtk示例来测试它。）

也许这是您的其他代码或主题的问题？

#!/usr/bin/env python

# example menu.py

import pygtk
pygtk.require('2.0')
import gtk

class MenuExample:
    def __init__(self):
        # create a new window
        window = gtk.Window(gtk.WINDOW_TOPLEVEL)
        window.set_size_request(200, 100)
        window.set_title("GTK Menu Test")
        window.connect("delete_event", lambda w,e: gtk.main_quit())

        # Init the menu-widget, and remember -- never
        # show() the menu widget!! 
        # This is the menu that holds the menu items, the one that
        # will pop up when you click on the "Root Menu" in the app
        menu = gtk.Menu()

        ### MODIFIED PART!! ###
        item = gtk.MenuItem()

        button = gtk.ProgressBar()
        button.pulse()
        button.show()

        item.add(button)
        item.show()

        menu.append(item)
        #### END MODIFIED PART ####

        # This is the root menu, and will be the label
        # displayed on the menu bar.  There won't be a signal handler attached,
        # as it only pops up the rest of the menu when pressed.
        root_menu = gtk.MenuItem("Root Menu")

        root_menu.show()

        # Now we specify that we want our newly created "menu" to be the
        # menu for the "root menu"
        root_menu.set_submenu(menu)

        # A vbox to put a menu and a button in:
        vbox = gtk.VBox(False, 0)
        window.add(vbox)
        vbox.show()

        # Create a menu-bar to hold the menus and add it to our main window
        menu_bar = gtk.MenuBar()
        vbox.pack_start(menu_bar, False, False, 2)
        menu_bar.show()

        # Create a button to which to attach menu as a popup
        button = gtk.Button("press me")
        button.connect_object("event", self.button_press, menu)
        vbox.pack_end(button, True, True, 2)
        button.show()

        # And finally we append the menu-item to the menu-bar -- this is the
        # "root" menu-item I have been raving about =)
        menu_bar.append (root_menu)

        # always display the window as the last step so it all splashes on
        # the screen at once.
        window.show()

    # Respond to a button-press by posting a menu passed in as widget.
    #
    # Note that the "widget" argument is the menu being posted, NOT
    # the button that was pressed.
    def button_press(self, widget, event):
        if event.type == gtk.gdk.BUTTON_PRESS:
            widget.popup(None, None, None, event.button, event.time)
            # Tell calling code that we have handled this event the buck
            # stops here.
            return True
        # Tell calling code that we have not handled this event pass it on.
        return False

    # Print a string when a menu item is selected
    def menuitem_response(self, widget, string):
        print "%s" % string

def main():
    gtk.main()
    return 0

if __name__ == "__main__":
    MenuExample()
    main()