Class EventHandler

src/py/reactpy/reactpy/core/events.py:78–128

Turn a function or coroutine into an event handler Parameters: function: The function or coroutine which handles the event. stop_propagation: Block the event from propagating further up the DOM. prevent_default: Stops the default actio

class EventHandler:
    """Turn a function or coroutine into an event handler

    Parameters:
        function:
            The function or coroutine which handles the event.
        stop_propagation:
            Block the event from propagating further up the DOM.
        prevent_default:
            Stops the default action associate with the event from taking place.
        target:
            A unique identifier for this event handler (auto-generated by default)
    """

    __slots__ = (
        "__weakref__",
        "function",
        "prevent_default",
        "stop_propagation",
        "target",
    )

    def __init__(
        self,
        function: EventHandlerFunc,
        stop_propagation: bool = False,
        prevent_default: bool = False,
        target: str | None = None,
    ) -> None:
        self.function = to_event_handler_function(function, positional_args=False)
        self.prevent_default = prevent_default
        self.stop_propagation = stop_propagation
        self.target = target

    def __eq__(self, other: object) -> bool:
        undefined = object()
        for attr in (
            "function",
            "prevent_default",
            "stop_propagation",
            "target",
        ):
            if not attr.startswith("_"):
                if not getattr(other, attr, undefined) == getattr(self, attr):
                    return False
        return True

    def __repr__(self) -> str:
        public_names = [name for name in self.__slots__ if not name.startswith("_")]
        items = ", ".join([f"{n}={getattr(self, n)!r}" for n in public_names])
        return f"{type(self).__name__}({items})"


def to_event_handler_function(