Gtk3 ProgressBar(): impossibile ricevere eventi in Python

Question

Sto provando a migrare un lettore audio, scritto in python, in GTK3 +. In GTK2 ho usato progress_bar.add_event (... pointer_motion_notify | button_press) (codice completo sotto) e impostare un gestore di segnale per button_press e pointer_motion_notify. In GTK3, sembra che ProgressBar() non emetta questi segnali.

Ho implementato una soluzione alternativa utilizzando Overlay() e DrawingArea() che consente a DrawingArea di emettere i segnali, ma non dovrebbe essere necessario ... Si tratta di un bug? o sto sbagliando?

Codice:

import gi 
gi.require_version("Gtk","3.0") 
from gi.repository import Gtk, Gdk, GObject 

class MainWindow(Gtk.Window): 
    def __init__(self): 
     super(MainWindow, self).__init__(title='ProgressBar Event Test') 
     self.progressbar = Gtk.ProgressBar() 
     self.add(self.progressbar) 
     self.progressbar.set_events(Gdk.EventMask.BUTTON_PRESS_MASK 
            | Gdk.EventMask.POINTER_MOTION_MASK) 
     self.progressbar.connect("button-press-event", self.on_event, 'button-press') 
     self.progressbar.connect("motion-notify-event", self.on_event, 'motion-notify') 
     self.connect("delete-event", Gtk.main_quit) 
     self.current_progress = 0.0 
     GObject.timeout_add(200,self.update_progress) 
     self.show_all() 

    def on_event(self, widget, event, data=None): 
     print "on_event called for %s signal"%data 
     return False 

    def update_progress(self): 
     self.progressbar.set_fraction(self.current_progress) 
     self.current_progress += 0.01 
     return self.current_progress <= 1 # False cancels timeout 

def main(): 
    w = MainWindow() 
    Gtk.main() 

if __name__ == '__main__': 
    main() 

Answer 1

sua probabilmente meglio usare un EventBox - si aggiunge il widget per l'EventBox e viene collegata a EventBox stessi segnali.

Così:

import gi 
gi.require_version("Gtk","3.0") 
from gi.repository import Gtk, Gdk, GObject 

class MainWindow(Gtk.Window): 
    def __init__(self): 
     super(MainWindow, self).__init__(title='ProgressBar Event Test') 
     eventbox = Gtk.EventBox() 
     self.progressbar = Gtk.ProgressBar() 
     eventbox.add(self.progressbar) 
     self.add(eventbox) 
     eventbox.set_events(Gdk.EventMask.BUTTON_PRESS_MASK 
            | Gdk.EventMask.POINTER_MOTION_MASK) 
     eventbox.connect("button-press-event", self.on_event, 'button-press') 
     eventbox.connect("motion-notify-event", self.on_event, 'motion-notify') 
     self.connect("delete-event", Gtk.main_quit) 
     self.current_progress = 0.0 
     GObject.timeout_add(200,self.update_progress) 
     self.show_all() 

    def on_event(self, widget, event, data=None): 
     print "on_event called for %s signal"%data 
     return False 

    def update_progress(self): 
     self.progressbar.set_fraction(self.current_progress) 
     self.current_progress += 0.01 
     return self.current_progress <= 1 # False cancels timeout 

def main(): 
    w = MainWindow() 
    Gtk.main() 

if __name__ == '__main__': 
    main() 

Maggiori informazioni sul Gtk.Eventbox può essere trovato here.