dock.py

from gi.repository import Gtk as gtk
from gi.repository import Gdk as gdk
from gi.repository import GObject as gobject
from gi.repository import Wnck as wnck

class App:
    def __init__(self):
        self.checker = wnck.Screen.get_default()
        self.checker.connect("active-window-changed", self.RefreshItAgain)
        self.checker.connect("active-workspace-changed", self.RefreshIt)
        self.checker.connect("window-opened", self.RefreshIt)
        self.checker.connect("window-closed", self.RefreshIt)

        self.checker.get_active_workspace()
        self.checker.get_active_window()
        self.checker.get_windows()
        self.checker.get_workspaces()

        #create appbar box and window#
        self.appbarHBox = gtk.HBox()
        self.appbarHBox.set_name("appbarHBox")
        self.appbarHBox.show()

        dockWindow = gtk.Window()
        dockWindow.connect("destroy",lambda w: gtk.main_quit())
        dockWindow.set_size_request(gdk.Screen.get_default().get_width(),0)
        dockWindow.set_decorated(True)
        dockWindow.set_keep_above(True)
        dockWindow.set_decorated(False)
        dockWindow.add(self.appbarHBox)
        dockWindow.show_all()

        gobject.timeout_add(2,self.RefreshIt)

        dockWindow.show_all()
        gtk.main()

    def Activate(self,checker,widnow):
        widnow.activate(int(gobject.get_current_time()))

    def RefreshItAgain(self,checker,widnow):
        try:
            activeWindow = self.checker.get_active_window()
            for b in self.appbarHBox.get_children():
                b.set_active(b.window == window)

        except Exception:
            pass

    def RefreshIt(self,*args):
        for b in self.appbarHBox.get_children():
            self.appbarHBox.remove(b)

        activeWorkspace = self.checker.get_active_workspace()
        activeWindow = self.checker.get_active_window()

        for w in self.checker.get_windows():
            if w.get_workspace() == activeWorkspace:
                self.appButton = gtk.ToggleButton()
                self.appButton.set_relief(gtk.ReliefStyle.NONE)

                self.appButton.w = w
                self.appButton.set_active(w == activeWindow)

                self.appButtonIcon = w.get_icon()
                self.appButton.set_image(gtk.Image.new_from_pixbuf(self.appButtonIcon))
                self.appButton.set_tooltip_text(w.get_name())
                self.appButton.connect("clicked",self.Activate,w)
                self.appButton.show()
                self.appbarHBox.pack_start(self.appButton,False,False,0)

App()