@abc.abstractmethod
def group(self) -> None:
"""Perform grouping of items."""
@abc.abstractmethod
def ungroup(self) -> None:
"""Perform ungrouping of items."""
# Work around issue https://github.com/python/mypy/issues/3135 (Class decorators are not type checked)
# This definition, along with the the ignore below, seems to fix the behaviour for mypy at least.
# @multidispatch(object, object)
class NoGrouping(AbstractGroup):
def can_contain(self) -> bool:
return False
def group(self) -> None:
pass
def ungroup(self) -> None:
pass
Group: FunctionDispatcher[Type[AbstractGroup]] = multidispatch(
object, object)(NoGrouping)
# Until we can deal with types (esp. typing.Any) we use this as a workaround:
Group.register(None, object)(NoGrouping)
) -> None:
pass
def allow(self, handle: Handle, port: Port) -> bool:
return False
def connect(self, handle: Handle, port: Port) -> bool:
return False
def disconnect(self, handle: Handle) -> None:
pass
# Work around issue https://github.com/python/mypy/issues/3135 (Class decorators are not type checked)
# This definition, along with the the ignore below, seems to fix the behaviour for mypy at least.
Connector: FunctionDispatcher[Type[ConnectorProtocol]] = multidispatch(
object, object)(NoConnector)
class UnaryRelationshipConnect(BaseConnector):
"""
Base class for relationship connections, such as associations,
dependencies and implementations.
Unary relationships are allowed to connect both ends to the same element
This class introduces a new method: relationship() which is used to
find an existing relationship in the model that does not yet exist
on the canvas.
"""
element: ElementPresentation[Element]
"""
raise NotImplementedError(f"No connector for {self.item} and {self.line_item}")
def disconnect(self, handle: Handle) -> None:
"""
The true disconnect. Disconnect a handle.connected_to from an
element. This requires that the relationship is also removed at
model level.
"""
raise NotImplementedError(f"No connector for {self.item} and {self.line_item}")
# Work around issue https://github.com/python/mypy/issues/3135 (Class decorators are not type checked)
# This definition, along with the the ignore below, seems to fix the behaviour for mypy at least.
IConnect: FunctionDispatcher[Type[ConnectBase]] = multidispatch(object, object)(
ConnectBase
)
class AbstractConnect(ConnectBase):
"""
Connection adapter for Gaphor diagram items.
Line item ``line`` connects with a handle to a connectable item ``element``.
Attributes:
- line: connecting item
- element: connectable item
The following methods are required to make this work: