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from enum import Enum, auto
import logging
from typing import TYPE_CHECKING, Callable, Optional
from patshared import ViewData, ViewsDictEnsureOne, PortTypesViewFlag
if TYPE_CHECKING:
from patchbay_manager import PatchbayManager
_logger = logging.getLogger(__name__)
class CancelOp(Enum):
PTV_CHOICE = auto()
'Save the port types view choice only'
VIEW_CHOICE = auto()
'save the view choice only'
VIEW = auto()
'save all the current view'
ALL_VIEWS = auto()
'save all the views'
ALL_VIEWS_NO_POS = auto()
'save all the views, without group positions'
class ActionRestorer:
def __init__(self, op_type: CancelOp):
self.type = op_type
self.name = ''
self.view_num_bef = 1
self.view_num_aft = 1
self.view_data_bef: Optional[ViewData] = None
self.view_data_aft: Optional[ViewData] = None
self.views_bef : Optional[ViewsDictEnsureOne] = None
self.views_aft: Optional[ViewsDictEnsureOne] = None
self.ptv_bef: Optional[PortTypesViewFlag] = None
self.ptv_aft: Optional[PortTypesViewFlag] = None
self.undo_func: Optional[Callable] = None
self.undo_args: tuple = ()
self.redo_func: Optional[Callable] = None
self.redo_args: tuple = ()
class CancellableAction:
'''Context for 'with' statment. save the data at begin and at end
for undo/redo actions'''
def __init__(self, mng: 'PatchbayManager', op_type: CancelOp, *datas):
self.cancel_mng = mng.cancel_mng
self.op_type = op_type
def __enter__(self) -> ActionRestorer:
return self.cancel_mng.prepare(self.op_type)
def __exit__(self, *args, **kwargs):
self.cancel_mng.post_prepare(self.op_type)
class CancelMng:
def __init__(self, mng: 'PatchbayManager'):
self.mng = mng
self.actions = list[ActionRestorer]()
self.canceled_acts = list[ActionRestorer]()
self.new_pos_created = False
'''In VIEW_CHOICE action, GroupPos can be be created in a view
, in this case, cancel_mng considers finally this action
as ALL_VIEWS.'''
self._recording = False
def prepare(self, op_type: CancelOp):
if self._recording:
raise RecursionError
self.new_pos_created = False
self._recording = True
action = ActionRestorer(op_type)
action.view_num_bef = self.mng.view_number
match op_type:
case CancelOp.VIEW|CancelOp.PTV_CHOICE:
action.view_data_bef = self.mng.view().copy()
if op_type is CancelOp.PTV_CHOICE:
action.ptv_bef = self.mng.port_types_view
case CancelOp.VIEW_CHOICE|CancelOp.ALL_VIEWS:
action.views_bef = self.mng.views.copy()
case CancelOp.ALL_VIEWS_NO_POS:
action.views_bef = self.mng.views.copy(with_positions=False)
self.actions.append(action)
self.canceled_acts.clear()
return action
def post_prepare(self, op_type: CancelOp):
self._recording = False
if not self.actions:
# should not happen, prepare has just added an action
return
action = self.actions[-1]
if not action.type is op_type:
# should not happen, for the same reason
return
match op_type:
case CancelOp.VIEW_CHOICE:
if self.new_pos_created:
action.type = CancelOp.ALL_VIEWS
else:
action.view_data_bef = None
case CancelOp.PTV_CHOICE:
if self.new_pos_created:
action.type = CancelOp.VIEW
action.ptv_bef = None
else:
action.view_data_bef = None
action.ptv_aft = self.mng.port_types_view
action.view_num_aft = self.mng.view_number
match action.type:
case CancelOp.VIEW:
action.view_data_aft = self.mng.view().copy()
case CancelOp.ALL_VIEWS:
action.views_aft = self.mng.views.copy()
case CancelOp.ALL_VIEWS_NO_POS:
action.views_aft = self.mng.views.copy(with_positions=False)
self.mng.sg.undo_redo_changed.emit()
def undo(self):
if not self.actions:
return
action = self.actions.pop(-1)
self.canceled_acts.append(action)
if action.undo_func is not None:
action.undo_func(*action.undo_args)
match action.type:
case CancelOp.PTV_CHOICE:
if action.ptv_bef is None:
_logger.error(f"action {action.name} has no ptv_bef")
return
self.mng.change_port_types_view(action.ptv_bef)
case CancelOp.VIEW_CHOICE:
self.mng.change_view(action.view_num_bef)
case CancelOp.VIEW:
if action.view_data_bef is None:
_logger.error(f"action {action.name} has no view_data_bef")
return
self.mng.views[action.view_num_bef] = action.view_data_bef.copy()
self.mng.set_views_changed()
self.mng.change_view(action.view_num_bef)
case CancelOp.ALL_VIEWS:
if action.views_bef is None:
_logger.error(f"action {action.name} has no views_bef")
return
self.mng.views = action.views_bef.copy()
self.mng.set_views_changed()
self.mng.change_view(action.view_num_bef)
case CancelOp.ALL_VIEWS_NO_POS:
if action.views_bef is None:
_logger.error(f"action {action.name} has no views_bef")
return
self.mng.views.eat_views_dict_datas(action.views_bef)
self.mng.set_views_changed()
self.mng.change_view(action.view_num_bef)
self.mng.sg.undo_redo_changed.emit()
def redo(self):
if not self.canceled_acts:
return
action = self.canceled_acts.pop(-1)
self.actions.append(action)
if action.redo_func is not None:
action.redo_func(*action.redo_args)
if action.type is CancelOp.VIEW_CHOICE:
self.mng.change_view(action.view_num_aft)
elif action.type is CancelOp.PTV_CHOICE:
if action.ptv_aft is None:
_logger.error(f"action {action.name} has no ptv_aft")
return
self.mng.change_port_types_view(action.ptv_aft)
elif action.type is CancelOp.VIEW:
if action.view_data_aft is None:
_logger.error(f"action {action.name} has no ptv_aft")
return
self.mng.views[action.view_num_aft] = action.view_data_aft.copy()
self.mng.set_views_changed()
self.mng.change_view(action.view_num_aft)
elif action.type is CancelOp.ALL_VIEWS:
if action.views_aft is None:
_logger.error(f"action {action.name} has no ptv_aft")
return
self.mng.views = action.views_aft.copy()
self.mng.set_views_changed()
self.mng.change_view(action.view_num_aft)
self.mng.sg.undo_redo_changed.emit()
def reset(self):
self.actions.clear()
self.canceled_acts.clear()
self.mng.sg.undo_redo_changed.emit()
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