Python undo.UndoableActionLog类代码示例

    def __init__(self):
        Loggable.__init__(self)

        # Init logging as early as possible so we can log startup code
        enable_color = not os.environ.get('PITIVI_DEBUG_NO_COLOR', '0') in ('', '1')
        # Let's show a human-readable pitivi debug output by default, and only
        # show a crazy unreadable mess when surrounded by gst debug statements.
        enable_crack_output = "GST_DEBUG" in os.environ
        log.init('PITIVI_DEBUG', enable_color, enable_crack_output)

        self.info('starting up')

        self.settings = GlobalSettings()
        self.threads = ThreadMaster()
        self.effects = EffectsHandler()
        self.system = getSystem()

        self.current_project = None
        self.projectManager = ProjectManager(self)
        self._connectToProjectManager(self.projectManager)

        self.action_log = UndoableActionLog()
        self.debug_action_log_observer = DebugActionLogObserver()
        self.debug_action_log_observer.startObserving(self.action_log)
        # TODO reimplement the observing after GES port
        #self.timelineLogObserver = TimelineLogObserver(self.action_log)
        self.projectLogObserver = ProjectLogObserver(self.action_log)

        self._version_information = {}
        self._checkVersion()

 def setUp(self):
     self.timeline = GES.Timeline.new_audio_video()
     self.layer = GES.Layer()
     self.timeline.add_layer(self.layer)
     self.action_log = UndoableActionLog()
     self.observer = TimelineLogObserverSpy(self.action_log)
     self.observer.startObserving(self.timeline)

    def __init__(self):
        Gtk.Application.__init__(self,
                                 application_id="org.pitivi",
                                 flags=Gio.ApplicationFlags.HANDLES_OPEN)
        Loggable.__init__(self)

        self.settings = None
        self.threads = None
        self.effects = None
        self.system = None
        self.project_manager = ProjectManager(self)

        self.action_log = UndoableActionLog(self)
        self.timeline_log_observer = None
        self.project_log_observer = None
        self._last_action_time = Gst.util_get_timestamp()

        self.gui = None
        self.welcome_wizard = None

        self._version_information = {}

        self._scenario_file = None
        self._first_action = True

        Zoomable.app = self
        self.connect("startup", self._startupCb)
        self.connect("activate", self._activateCb)
        self.connect("open", self.openCb)

    def _startupCb(self, unused_app):
        # Init logging as early as possible so we can log startup code
        enable_color = not os.environ.get('PITIVI_DEBUG_NO_COLOR', '0') in ('', '1')
        # Let's show a human-readable Pitivi debug output by default, and only
        # show a crazy unreadable mess when surrounded by gst debug statements.
        enable_crack_output = "GST_DEBUG" in os.environ
        log.init('PITIVI_DEBUG', enable_color, enable_crack_output)

        self.info('starting up')
        self.settings = GlobalSettings()
        self.threads = ThreadMaster()
        self.effects = EffectsHandler()
        self.system = getSystem()

        self.action_log = UndoableActionLog()
        self.action_log.connect("commit", self._actionLogCommit)
        self.action_log.connect("undo", self._actionLogUndo)
        self.action_log.connect("redo", self._actionLogRedo)
        self.action_log.connect("cleaned", self._actionLogCleaned)
        self.timeline_log_observer = TimelineLogObserver(self.action_log)
        self.project_log_observer = ProjectLogObserver(self.action_log)

        self.project_manager.connect("new-project-loaded", self._newProjectLoaded)
        self.project_manager.connect("project-closed", self._projectClosed)

        self._createActions()
        self._checkVersion()

    def setUp(self):
        app = Pitivi()
        app._startupCb(app)
        app.project_manager.newBlankProject()

        self.timeline = app.project_manager.current_project.timeline
        self.layer = GES.Layer()
        self.timeline.add_layer(self.layer)
        self.action_log = UndoableActionLog()
        self.observer = TimelineLogObserverSpy(self.action_log)
        self.observer.startObserving(self.timeline)

    def __init__(self):
        """
        initialize pitivi with the command line arguments
        """
        Loggable.__init__(self)

        # init logging as early as possible so we can log startup code
        enable_color = os.environ.get('PITIVI_DEBUG_NO_COLOR', '0') in ('', '0')
        # Let's show a human-readable pitivi debug output by default, and only
        # show a crazy unreadable mess when surrounded by gst debug statements.
        enable_crack_output = "GST_DEBUG" in os.environ
        log.init('PITIVI_DEBUG', enable_color, enable_crack_output)

        self.info('starting up')

        # store ourself in the instance global
        if instance.PiTiVi:
            raise RuntimeWarning(_("There is already a %s instance, please inform "
                "the developers by filing a bug at "
                "http://bugzilla.gnome.org/enter_bug.cgi?product=pitivi")
                % APPNAME)
        instance.PiTiVi = self

        self.current = None

        # get settings
        self.settings = GlobalSettings()
        self.threads = ThreadMaster()
        #self.screencast = False

        self.effects = EffectsHandler()
        self.system = getSystem()

        self.projectManager = ProjectManager(self.effects)
        self._connectToProjectManager(self.projectManager)

        self.action_log = UndoableActionLog()
        self.debug_action_log_observer = DebugActionLogObserver()
        self.debug_action_log_observer.startObserving(self.action_log)
        # TODO reimplement the observing after GES port
        #self.timelineLogObserver = TimelineLogObserver(self.action_log)
        self.projectLogObserver = ProjectLogObserver(self.action_log)
        self.medialibrary_log_observer = MediaLibraryLogObserver(self.action_log)

        self.version_information = {}
        self._checkVersion()

class Pitivi(Loggable, Signallable):
    """
    Pitivi's main application class.

    Signals:
     - C{new-project} : A new C{Project} is loaded and ready to use.

     - C{new-project-loading} : Pitivi is attempting to load a new project.
     - C{new-project-loaded} : A new L{Project} has been loaded, and the UI should refresh it's view.
     - C{new-project-failed} : A new L{Project} failed to load.
     - C{closing-project} :  pitivi would like to close a project. handlers should return false
     if they do not want this project to close. by default, assumes
     true. This signal should only be used by classes that might want to abort
     the closing of a project.
     - C{project-closed} : The project is closed, it will be freed when the callback returns.
     Classes should connect to this instance when they want to know that
     data related to that project is no longer going to be used.
     - C{shutdown} : Used internally, do not use this signal.`

    @ivar settings: Application-wide settings.
    @type settings: L{GlobalSettings}.
    @ivar current: Currently used project.
    @type current: L{Project}.
    """

    __signals__ = {
        "new-project": ["project"],
        "new-project-loading": ["uri"],
        "new-project-created": ["project"],
        "new-project-loaded": ["project"],
        "new-project-failed": ["uri", "exception"],
        "closing-project": ["project"],
        "project-closed": ["project"],
        "missing-uri": ["formatter", "uri"],
        "version-info-received": ["versions"],
        "shutdown": None}

    def __init__(self):
        """
        initialize pitivi with the command line arguments
        """
        Loggable.__init__(self)

        # init logging as early as possible so we can log startup code
        enable_color = os.environ.get('PITIVI_DEBUG_NO_COLOR', '0') in ('', '0')
        # Let's show a human-readable pitivi debug output by default, and only
        # show a crazy unreadable mess when surrounded by gst debug statements.
        enable_crack_output = "GST_DEBUG" in os.environ
        log.init('PITIVI_DEBUG', enable_color, enable_crack_output)

        self.info('starting up')

        # store ourself in the instance global
        if instance.PiTiVi:
            raise RuntimeWarning(_("There is already a %s instance, please inform "
                "the developers by filing a bug at "
                "http://bugzilla.gnome.org/enter_bug.cgi?product=pitivi")
                % APPNAME)
        instance.PiTiVi = self

        self.current = None

        # get settings
        self.settings = GlobalSettings()
        self.threads = ThreadMaster()
        #self.screencast = False

        self.effects = EffectsHandler()
        self.system = getSystem()

        self.projectManager = ProjectManager(self.effects)
        self._connectToProjectManager(self.projectManager)

        self.action_log = UndoableActionLog()
        self.debug_action_log_observer = DebugActionLogObserver()
        self.debug_action_log_observer.startObserving(self.action_log)
        # TODO reimplement the observing after GES port
        #self.timelineLogObserver = TimelineLogObserver(self.action_log)
        self.projectLogObserver = ProjectLogObserver(self.action_log)
        self.medialibrary_log_observer = MediaLibraryLogObserver(self.action_log)

        self.version_information = {}
        self._checkVersion()

    def shutdown(self):
        """
        Close PiTiVi.

        @return: C{True} if PiTiVi was successfully closed, else C{False}.
        @rtype: C{bool}
        """
        self.debug("shutting down")
        # we refuse to close if we're running a user interface and the user
        # doesn't want us to close the current project.
        if self.current and not self.projectManager.closeRunningProject():
            self.warning("Not closing since running project doesn't want to close")
            return False
        self.threads.stopAllThreads()
        self.settings.storeSettings()
        self.current = None
#.........这里部分代码省略.........

class TestTimelineUndo(TestCase):

    def setUp(self):
        app = Pitivi()
        app._startupCb(app)
        app.project_manager.newBlankProject()

        self.timeline = app.project_manager.current_project.timeline
        self.layer = GES.Layer()
        self.timeline.add_layer(self.layer)
        self.action_log = UndoableActionLog()
        self.observer = TimelineLogObserverSpy(self.action_log)
        self.observer.startObserving(self.timeline)

    def getTimelineClips(self):
        for layer in self.timeline.layers:
            for clip in layer.get_clips():
                yield clip

    @staticmethod
    def commitCb(action_log, stack, nested, stacks):
        stacks.append(stack)

    def testAddClip(self):
        stacks = []
        self.action_log.connect("commit", TestTimelineUndo.commitCb, stacks)

        clip1 = GES.TitleClip()
        self.action_log.begin("add clip")
        self.layer.add_clip(clip1)
        self.action_log.commit()

        self.assertEqual(1, len(stacks))
        stack = stacks[0]
        self.assertEqual(1, len(stack.done_actions))
        action = stack.done_actions[0]
        self.assertTrue(isinstance(action, ClipAdded))
        self.assertTrue(clip1 in self.getTimelineClips())

        self.action_log.undo()
        self.assertFalse(clip1 in self.getTimelineClips())

        self.action_log.redo()
        self.assertTrue(clip1 in self.getTimelineClips())

    def testRemoveClip(self):
        stacks = []
        self.action_log.connect("commit", TestTimelineUndo.commitCb, stacks)

        clip1 = GES.TitleClip()
        self.layer.add_clip(clip1)
        self.action_log.begin("remove clip")
        self.layer.remove_clip(clip1)
        self.action_log.commit()

        self.assertEqual(1, len(stacks))
        stack = stacks[0]
        self.assertEqual(1, len(stack.done_actions))
        action = stack.done_actions[0]
        self.assertTrue(isinstance(action, ClipRemoved))
        self.assertFalse(clip1 in self.getTimelineClips())

        self.action_log.undo()
        self.assertTrue(clip1 in self.getTimelineClips())

        self.action_log.redo()
        self.assertFalse(clip1 in self.getTimelineClips())

    def testAddEffectToClip(self):
        stacks = []
        self.action_log.connect("commit", TestTimelineUndo.commitCb, stacks)

        clip1 = GES.TitleClip()
        self.layer.add_clip(clip1)

        effect1 = GES.Effect.new("agingtv")
        self.action_log.begin("add effect")
        clip1.add(effect1)
        self.action_log.commit()

        self.assertEqual(1, len(stacks))
        stack = stacks[0]
        self.assertEqual(1, len(stack.done_actions), stack.done_actions)
        action = stack.done_actions[0]
        self.assertTrue(isinstance(action, TrackElementAdded))

        self.assertTrue(effect1 in clip1.get_children(True))
        self.assertEqual(1, len([effect for effect in
                                 clip1.get_children(True)
                                 if isinstance(effect, GES.Effect)]))

        self.action_log.undo()
        self.assertFalse(effect1 in clip1.get_children(True))

        self.action_log.redo()
        self.assertEqual(1, len([effect for effect in
                                 clip1.get_children(True)
                                 if isinstance(effect, GES.Effect)]))

    def testRemoveEffectFromClip(self):
#.........这里部分代码省略.........

class Pitivi(Loggable, Signallable):
    """
    Pitivi's main application class.

    Signals:
     - C{new-project} : A new C{Project} is loaded and ready to use.

     - C{new-project-loading} : Pitivi is attempting to load a new project.
     - C{new-project-loaded} : A new L{Project} has been loaded, and the UI should refresh it's view.
     - C{new-project-failed} : A new L{Project} failed to load.
     - C{project-closed} : The project is closed, it will be freed when the callback returns.
     Classes should connect to this instance when they want to know that
     data related to that project is no longer going to be used.
     - C{shutdown} : Used internally, do not use this signal.`

    @ivar settings: Application-wide settings.
    @type settings: L{GlobalSettings}.
    @ivar current: Currently used project.
    @type current: L{Project}.
    """

    __signals__ = {
        "new-project": ["project"],
        "new-project-loading": ["uri"],
        "new-project-created": ["project"],
        "new-project-loaded": ["project"],
        "new-project-failed": ["uri", "exception"],
        "project-closed": ["project"],
        "missing-uri": ["formatter", "uri"],
        "version-info-received": ["versions"],
        "shutdown": None}

    def __init__(self):
        Loggable.__init__(self)

        # Init logging as early as possible so we can log startup code
        enable_color = not os.environ.get('PITIVI_DEBUG_NO_COLOR', '0') in ('', '1')
        # Let's show a human-readable pitivi debug output by default, and only
        # show a crazy unreadable mess when surrounded by gst debug statements.
        enable_crack_output = "GST_DEBUG" in os.environ
        log.init('PITIVI_DEBUG', enable_color, enable_crack_output)

        self.info('starting up')

        self.settings = GlobalSettings()
        self.threads = ThreadMaster()
        self.effects = EffectsHandler()
        self.system = getSystem()

        self.current_project = None
        self.projectManager = ProjectManager(self)
        self._connectToProjectManager(self.projectManager)

        self.action_log = UndoableActionLog()
        self.debug_action_log_observer = DebugActionLogObserver()
        self.debug_action_log_observer.startObserving(self.action_log)
        # TODO reimplement the observing after GES port
        #self.timelineLogObserver = TimelineLogObserver(self.action_log)
        self.projectLogObserver = ProjectLogObserver(self.action_log)

        self._version_information = {}
        self._checkVersion()

    def shutdown(self):
        """
        Close Pitivi.

        @return: C{True} if Pitivi was successfully closed, else C{False}.
        @rtype: C{bool}
        """
        self.debug("shutting down")
        # we refuse to close if we're running a user interface and the user
        # doesn't want us to close the current project.
        if self.current_project and not self.projectManager.closeRunningProject():
            self.warning("Not closing since running project doesn't want to close")
            return False
        self.threads.stopAllThreads()
        self.settings.storeSettings()
        self.current_project = None
        self.emit("shutdown")
        return True

    def _connectToProjectManager(self, projectManager):
        pm = projectManager
        pm.connect("new-project-loading", self._projectManagerNewProjectLoading)
        pm.connect("new-project-created", self._projectManagerNewProjectCreated)
        pm.connect("new-project-loaded", self._projectManagerNewProjectLoaded)
        pm.connect("new-project-failed", self._projectManagerNewProjectFailed)
        pm.connect("project-closed", self._projectManagerProjectClosed)

    def _projectManagerNewProjectLoading(self, unused_project_manager, uri):
        self.emit("new-project-loading", uri)

    def _projectManagerNewProjectCreated(self, unused_project_manager, project):
        self.current_project = project
        self.emit("new-project-created", project)

    def _newProjectLoaded(self, unused_project):
        pass

#.........这里部分代码省略.........

class Pitivi(Gtk.Application, Loggable):

    """
    Pitivi's application.

    @type effects: L{EffectsManager}
    @ivar gui: The main window of the app.
    @type gui: L{PitiviMainWindow}
    @ivar project_manager: The project manager object used in the application
    @type project_manager: L{ProjectManager}
    @ivar settings: Application-wide settings.
    @type settings: L{GlobalSettings}.
    """

    __gsignals__ = {
        "version-info-received": (GObject.SIGNAL_RUN_LAST, None, (object,))
    }

    def __init__(self):
        Gtk.Application.__init__(self,
                                 application_id="org.pitivi",
                                 flags=Gio.ApplicationFlags.HANDLES_OPEN)
        Loggable.__init__(self)

        self.settings = None
        self.threads = None
        self.effects = None
        self.system = None
        self.project_manager = ProjectManager(self)

        self.action_log = UndoableActionLog(self)
        self.timeline_log_observer = None
        self.project_log_observer = None
        self._last_action_time = Gst.util_get_timestamp()

        self.gui = None
        self.welcome_wizard = None

        self._version_information = {}

        self._scenario_file = None
        self._first_action = True

        self.connect("startup", self._startupCb)
        self.connect("activate", self._activateCb)
        self.connect("open", self.openCb)

    def write_action(self, action, properties={}):
        if self._first_action:
            self._scenario_file.write(
                "description, seek=true, handles-states=true\n")
            self._first_action = False

        now = Gst.util_get_timestamp()
        if now - self._last_action_time > 0.05 * Gst.SECOND:
            # We need to make sure that the waiting time was more than 50 ms.
            st = Gst.Structure.new_empty("wait")
            st["duration"] = float((now - self._last_action_time) / Gst.SECOND)
            self._scenario_file.write(st.to_string() + "\n")
            self._last_action_time = now

        if not isinstance(action, Gst.Structure):
            structure = Gst.Structure.new_empty(action)

            for key, value in properties.items():
                structure[key] = value

            action = structure

        self._scenario_file.write(action.to_string() + "\n")
        self._scenario_file.flush()

    def _startupCb(self, unused_app):
        # Init logging as early as possible so we can log startup code
        enable_color = not os.environ.get(
            'PITIVI_DEBUG_NO_COLOR', '0') in ('', '1')
        # Let's show a human-readable Pitivi debug output by default, and only
        # show a crazy unreadable mess when surrounded by gst debug statements.
        enable_crack_output = "GST_DEBUG" in os.environ
        log.init('PITIVI_DEBUG', enable_color, enable_crack_output)

        self.info('starting up')
        self.settings = GlobalSettings()
        self.threads = ThreadMaster()
        self.effects = EffectsManager()
        self.system = getSystem()

        self.action_log.connect("commit", self._actionLogCommit)
        self.action_log.connect("undo", self._actionLogUndo)
        self.action_log.connect("redo", self._actionLogRedo)
        self.action_log.connect("cleaned", self._actionLogCleaned)
        self.timeline_log_observer = TimelineLogObserver(self.action_log)
        self.project_log_observer = ProjectLogObserver(self.action_log)

        self.project_manager.connect(
            "new-project-loading", self._newProjectLoadingCb)
        self.project_manager.connect(
            "new-project-loaded", self._newProjectLoaded)
        self.project_manager.connect("project-closed", self._projectClosed)

#.........这里部分代码省略.........

class Pitivi(Gtk.Application, Loggable):
    """
    Pitivi's application.

    @type effects: L{EffectsManager}
    @ivar gui: The main window of the app.
    @type gui: L{PitiviMainWindow}
    @ivar project_manager: The project manager object used in the application
    @type project_manager: L{ProjectManager}
    @ivar settings: Application-wide settings.
    @type settings: L{GlobalSettings}.
    """

    __gsignals__ = {
        "version-info-received": (GObject.SIGNAL_RUN_LAST, None, (object,))
    }

    def __init__(self):
        Gtk.Application.__init__(self,
                                 application_id="org.pitivi",
                                 flags=Gio.ApplicationFlags.HANDLES_OPEN)
        Loggable.__init__(self)

        self.settings = None
        self.threads = None
        self.effects = None
        self.system = None
        self.project_manager = ProjectManager(self)

        self.action_log = UndoableActionLog()
        self.timeline_log_observer = None
        self.project_log_observer = None

        self.gui = None
        self.welcome_wizard = None

        self._version_information = {}

        self.connect("startup", self._startupCb)
        self.connect("activate", self._activateCb)
        self.connect("open", self.openCb)

    def _startupCb(self, unused_app):
        # Init logging as early as possible so we can log startup code
        enable_color = not os.environ.get('PITIVI_DEBUG_NO_COLOR', '0') in ('', '1')
        # Let's show a human-readable Pitivi debug output by default, and only
        # show a crazy unreadable mess when surrounded by gst debug statements.
        enable_crack_output = "GST_DEBUG" in os.environ
        log.init('PITIVI_DEBUG', enable_color, enable_crack_output)

        self.info('starting up')
        self.settings = GlobalSettings()
        self.threads = ThreadMaster()
        self.effects = EffectsManager()
        self.system = getSystem()

        self.action_log.connect("commit", self._actionLogCommit)
        self.action_log.connect("undo", self._actionLogUndo)
        self.action_log.connect("redo", self._actionLogRedo)
        self.action_log.connect("cleaned", self._actionLogCleaned)
        self.timeline_log_observer = TimelineLogObserver(self.action_log)
        self.project_log_observer = ProjectLogObserver(self.action_log)

        self.project_manager.connect("new-project-loaded", self._newProjectLoaded)
        self.project_manager.connect("project-closed", self._projectClosed)

        self._createActions()
        self._checkVersion()

    def _createActions(self):
        self.undo_action = Gio.SimpleAction.new("undo", None)
        self.undo_action.connect("activate", self._undoCb)
        self.add_action(self.undo_action)
        self.add_accelerator("<Control>z", "app.undo", None)

        self.redo_action = Gio.SimpleAction.new("redo", None)
        self.redo_action.connect("activate", self._redoCb)
        self.add_action(self.redo_action)
        self.add_accelerator("<Control><Shift>z", "app.redo", None)

        self.quit_action = Gio.SimpleAction.new("quit", None)
        self.quit_action.connect("activate", self._quitCb)
        self.add_action(self.quit_action)
        self.add_accelerator("<Control>q", "app.quit", None)

    def _activateCb(self, unused_app):
        if self.gui:
            # The app is already started and the window already created.
            # Present the already existing window.
            # TODO: Use present() instead of present_with_time() when
            # https://bugzilla.gnome.org/show_bug.cgi?id=688830 is fixed.
            x11_server_time = GdkX11.x11_get_server_time(self.gui.get_window())
            self.gui.present_with_time(x11_server_time)
            # No need to show the welcome wizard.
            return
        self.createMainWindow()
        self.welcome_wizard = StartUpWizard(self)
        self.welcome_wizard.show()

    def createMainWindow(self):
#.........这里部分代码省略.........

class TestUndoableActionLog(TestCase):

    def setUp(self):
        self.log = UndoableActionLog()
        self._connectToUndoableActionLog(self.log)
        self.signals = []

    def tearDown(self):
        self._disconnectFromUndoableActionLog(self.log)

    def _undoActionLogSignalCb(self, log, *args):
        args = list(args)
        signalName = args.pop(-1)
        self.signals.append((signalName, args))

    def _connectToUndoableActionLog(self, log):
        for signalName in ("begin", "push", "rollback", "commit", "move"):
            log.connect(signalName, self._undoActionLogSignalCb, signalName)

    def _disconnectFromUndoableActionLog(self, log):
        self.log.disconnect_by_func(self._undoActionLogSignalCb)

    def testRollbackWrongState(self):
        self.assertRaises(UndoWrongStateError, self.log.rollback)

    def testCommitWrongState(self):
        self.assertRaises(UndoWrongStateError, self.log.commit, "")

    def testPushWrongState(self):
        # no error in this case
        self.log.push(None)

    def testUndoWrongState(self):
        self.assertRaises(UndoWrongStateError, self.log.undo)

    def testRedoWrongState(self):
        self.assertRaises(UndoWrongStateError, self.log.redo)

    def testCheckpoint(self):
        self.log.begin("meh")
        self.log.push(mock.Mock(spec=UndoableAction))
        self.assertRaises(UndoWrongStateError, self.log.checkpoint)
        self.log.rollback()
        self.log.checkpoint()
        self.assertNotEqual(self.log._checkpoint, None)

    def testDirty(self):
        self.assertFalse(self.log.dirty())
        self.log.begin("meh")
        self.log.push(mock.Mock(spec=UndoableAction))
        self.log.commit("meh")
        self.assertTrue(self.log.dirty())
        self.log.checkpoint()
        self.assertFalse(self.log.dirty())
        self.log.undo()
        self.assertTrue(self.log.dirty())
        self.log.redo()
        self.assertFalse(self.log.dirty())

    def testCommit(self):
        """
        Commit a stack.
        """
        self.assertEqual(len(self.log.undo_stacks), 0)
        self.assertEqual(len(self.log.redo_stacks), 0)
        self.log.begin("meh")
        self.assertEqual(len(self.signals), 1)
        name, (stack,) = self.signals[0]
        self.assertEqual(name, "begin")
        self.assertTrue(self.log.is_in_transaction())

        self.assertEqual(self.log.undo_stacks, [])
        self.log.push(mock.Mock(spec=UndoableAction))
        self.log.commit("meh")
        self.assertEqual(len(self.signals), 3)
        name, (stack, action) = self.signals[1]
        self.assertEqual(name, "push")
        name, (stack,) = self.signals[2]
        self.assertEqual(name, "commit")
        self.assertFalse(self.log.is_in_transaction())
        self.assertEqual(len(self.log.undo_stacks), 1)
        self.assertEqual(len(self.log.redo_stacks), 0)

    def test_commit_proper(self):
        self.log.begin("meh")
        self.assertRaises(UndoWrongStateError, self.log.commit, "notmeh")

    def testNestedCommit(self):
        """
        Do two nested commits.
        """
        self.assertEqual(len(self.log.undo_stacks), 0)
        self.assertEqual(len(self.log.redo_stacks), 0)
        self.log.begin("meh")
        self.assertEqual(len(self.signals), 1)
        name, (stack,) = self.signals[0]
        self.assertEqual(name, "begin")
        self.assertTrue(self.log.is_in_transaction())

        self.assertEqual(len(self.log.undo_stacks), 0)
#.........这里部分代码省略.........

 def setUp(self):
     self.log = UndoableActionLog()
     self._connectToUndoableActionLog(self.log)
     self.signals = []

class TestUndoableActionLog(TestCase):
    def setUp(self):
        self.log = UndoableActionLog()
        self._connectToUndoableActionLog(self.log)
        self.signals = []

    def tearDown(self):
        self._disconnectFromUndoableActionLog(self.log)

    def _undoActionLogSignalCb(self, log, *args):
        args = list(args)
        signalName = args.pop(-1)
        self.signals.append((signalName, args))

    def _connectToUndoableActionLog(self, log):
        for signalName in ("begin", "push", "rollback", "commit",
                    "undo", "redo"):
            log.connect(signalName, self._undoActionLogSignalCb, signalName)

    def _disconnectFromUndoableActionLog(self, log):
        self.log.disconnect_by_func(self._undoActionLogSignalCb)

    def testRollbackWrongState(self):
        self.assertRaises(UndoWrongStateError, self.log.rollback)

    def testCommitWrongState(self):
        self.assertRaises(UndoWrongStateError, self.log.commit)

    def testPushWrongState(self):
        # no error in this case
        self.log.push(None)

    def testUndoWrongState(self):
        self.assertRaises(UndoWrongStateError, self.log.undo)

    def testRedoWrongState(self):
        self.assertRaises(UndoWrongStateError, self.log.redo)

    def testCheckpoint(self):
        self.log.begin("meh")
        self.log.push(DummyUndoableAction())
        self.assertRaises(UndoWrongStateError, self.log.checkpoint)
        self.log.rollback()
        self.log.checkpoint()
        self.assertNotEqual(self.log._checkpoint, None)

    def testDirty(self):
        self.assertFalse(self.log.dirty())
        self.log.begin("meh")
        self.log.push(DummyUndoableAction())
        self.log.commit()
        self.assertTrue(self.log.dirty())
        self.log.checkpoint()
        self.assertFalse(self.log.dirty())
        self.log.undo()
        self.assertTrue(self.log.dirty())
        self.log.redo()
        self.assertFalse(self.log.dirty())

    def testCommit(self):
        """
        Commit a stack.
        """
        self.assertEqual(len(self.log.undo_stacks), 0)
        self.assertEqual(len(self.log.redo_stacks), 0)
        self.log.begin("meh")
        self.assertEqual(len(self.signals), 1)
        name, (stack, nested) = self.signals[0]
        self.assertEqual(name, "begin")
        self.assertFalse(nested)

        self.assertEqual(self.log.undo_stacks, [])
        self.log.commit()
        self.assertEqual(len(self.signals), 2)
        name, (stack, nested) = self.signals[1]
        self.assertEqual(name, "commit")
        self.assertFalse(nested)
        self.assertEqual(len(self.log.undo_stacks), 1)
        self.assertEqual(len(self.log.redo_stacks), 0)

    def testNestedCommit(self):
        """
        Do two nested commits.
        """
        self.assertEqual(len(self.log.undo_stacks), 0)
        self.assertEqual(len(self.log.redo_stacks), 0)
        self.log.begin("meh")
        self.assertEqual(len(self.signals), 1)
        name, (stack, nested) = self.signals[0]
        self.assertEqual(name, "begin")
        self.assertFalse(nested)

        self.assertEqual(len(self.log.undo_stacks), 0)
        self.assertEqual(len(self.log.redo_stacks), 0)
        self.log.begin("nested")
        self.assertEqual(len(self.signals), 2)
        name, (stack, nested) = self.signals[1]
        self.assertEqual(name, "begin")
        self.assertTrue(nested)

#.........这里部分代码省略.........