Class _ModelState

src/py/reactpy/reactpy/core/layout.py:592–663

State that is bound to a particular element within the layout

class _ModelState:
    """State that is bound to a particular element within the layout"""

    __slots__ = (
        "__weakref__",
        "_parent_ref",
        "_render_semaphore",
        "children_by_key",
        "index",
        "key",
        "life_cycle_state",
        "model",
        "patch_path",
        "targets_by_event",
    )

    def __init__(
        self,
        parent: _ModelState | None,
        index: int,
        key: Any,
        model: Ref[VdomJson],
        patch_path: str,
        children_by_key: dict[Key, _ModelState],
        targets_by_event: dict[str, str],
        life_cycle_state: _LifeCycleState | None = None,
    ):
        self.index = index
        """The index of the element amongst its siblings"""

        self.key = key
        """A key that uniquely identifies the element amongst its siblings"""

        self.model = model
        """The actual model of the element"""

        self.patch_path = patch_path
        """A "/" delimited path to the element within the greater layout"""

        self.children_by_key = children_by_key
        """Child model states indexed by their unique keys"""

        self.targets_by_event = targets_by_event
        """The element's event handler target strings indexed by their event name"""

        # === Conditionally Available Attributes ===
        # It's easier to conditionally assign than to force a null check on every usage

        if parent is not None:
            self._parent_ref = weakref(parent)
            """The parent model state"""

        if life_cycle_state is not None:
            self.life_cycle_state = life_cycle_state
            """The state for the element's component (if it has one)"""

    @property
    def is_component_state(self) -> bool: