tixwidgets.py 文件源码

def loop(self):
        """This is an explict replacement for _tkinter mainloop()
        It lets you catch keyboard interrupts easier, and avoids
        the 20 msec. dead sleep() which burns a constant CPU."""
        while self.exit < 0:
            # There are 2 whiles here. The outer one lets you continue
            # after a ^C interrupt.
            try:
                # This is the replacement for _tkinter mainloop()
                # It blocks waiting for the next Tcl event using select.
                while self.exit < 0:
                    self.root.tk.dooneevent(TCL_ALL_EVENTS)
            except SystemExit:
                # Tkinter uses SystemExit to exit
                #print 'Exit'
                self.exit = 1
                return
            except KeyboardInterrupt:
                if tkMessageBox.askquestion ('Interrupt', 'Really Quit?') == 'yes':
                    # self.tk.eval('exit')
                    self.exit = 1
                    return
                continue
            except:
                # Otherwise it's some other error - be nice and say why
                t, v, tb = sys.exc_info()
                text = ""
                for line in traceback.format_exception(t,v,tb):
                    text += line + '\n'
                try: tkMessageBox.showerror ('Error', text)
                except: pass
                self.exit = 1
                raise SystemExit, 1