pythonnative/tests/test_events.py at preview-api-reference-fix · andevsr/pythonnative · GitHub

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"""Tests for tag-based event routing (`pythonnative.events`).

Covers the prop splitter (`extract_events`), the process-wide

`EventRegistry`, and the reconciler integration: callables never reach

the native payload, dispatch hits the *latest* closure, and destroy

clears registrations.

"""

from __future__ import annotations

from typing import Any, List

from fake_backend import FakeBackend

from pythonnative.element import Element

from pythonnative.events import (

EVENTS_PROP,

EventRegistry,

dispatch_event,

event_names,

extract_events,

get_event_registry,

)

from pythonnative.reconciler import Reconciler

# ======================================================================

# extract_events: prop splitting

# ======================================================================

def test_extract_strips_on_callables_into_events() -> None:

pressed: List[int] = []

props = {"title": "Go", "on_press": lambda: pressed.append(1), "enabled": True}

clean, events = extract_events(props)

assert set(events) == {"on_press"}

assert "on_press" not in clean

assert clean["title"] == "Go" and clean["enabled"] is True

assert clean[EVENTS_PROP] == frozenset({"on_press"})

def test_extract_keeps_non_callable_on_props() -> None:

clean, events = extract_events({"on_press": "not-a-callback"})

assert events == {}

assert clean["on_press"] == "not-a-callback"

assert EVENTS_PROP not in clean

def test_extract_without_events_adds_no_marker() -> None:

clean, events = extract_events({"text": "hi"})

assert events == {}

assert clean == {"text": "hi"}

def test_extract_hoists_nested_refresh_control_callback() -> None:

refreshed: List[int] = []

props = {

"refresh_control": {

"refreshing": True,

"tint_color": "#123456",

"on_refresh": lambda: refreshed.append(1),

}

clean, events = extract_events(props)

assert set(events) == {"on_refresh"}

assert clean["refresh_control"] == {"refreshing": True, "tint_color": "#123456"}

events["on_refresh"]()

assert refreshed == [1]

def test_extract_serializes_gestures_to_plain_specs() -> None:

from pythonnative.gestures import Tap

taps: List[Any] = []

clean, events = extract_events({"gestures": [Tap(on_tap=taps.append, n_taps=2)]})

assert clean["gestures"] == [{"kind": "tap", "n_taps": 2, "max_distance": 12.0, "simultaneous": [], "wait_for": []}]

assert set(events) == {"gesture:0"}

assert clean[EVENTS_PROP] == frozenset({"gesture:0"})

# The router converts the raw payload into a GestureEvent.

events["gesture:0"]({"kind": "tap", "state": "ended", "x": 5.0, "y": 6.0})

assert len(taps) == 1

assert taps[0].x == 5.0 and taps[0].y == 6.0

def test_event_names_accepts_multiple_shapes() -> None:

assert event_names({EVENTS_PROP: frozenset({"on_press"})}) == frozenset({"on_press"})

assert event_names({EVENTS_PROP: ["on_a", "on_b"]}) == frozenset({"on_a", "on_b"})

assert event_names({}) == frozenset()

# ======================================================================

# EventRegistry

# ======================================================================

def test_registry_set_get_dispatch() -> None:

registry = EventRegistry()

hits: List[Any] = []

registry.set_events(7, {"on_change": lambda v: hits.append(v)})

assert registry.has(7, "on_change")

assert registry.dispatch(7, "on_change", "abc") is True

assert hits == ["abc"]

assert registry.dispatch(7, "on_other") is False

assert registry.dispatch(99, "on_change") is False

def test_registry_set_events_replaces_previous_bucket() -> None:

registry = EventRegistry()

registry.set_events(1, {"on_a": lambda: None, "on_b": lambda: None})

registry.set_events(1, {"on_a": lambda: None})

assert registry.has(1, "on_a")

assert not registry.has(1, "on_b")

registry.set_events(1, {})

assert not registry.has(1, "on_a")

def test_registry_clear_drops_tag() -> None:

registry = EventRegistry()

registry.set_events(3, {"on_press": lambda: None})

registry.clear(3)

assert registry.dispatch(3, "on_press") is False

def test_dispatch_swallows_callback_exceptions() -> None:

registry = EventRegistry()

def boom() -> None:

raise RuntimeError("user bug")

registry.set_events(5, {"on_press": boom})

# Returns True (a callback ran) without propagating; a buggy app

# callback must not crash the platform UI thread.

assert registry.dispatch(5, "on_press") is True

# ======================================================================

# Reconciler integration

# ======================================================================

def _mounted(el: Element) -> tuple:

backend = FakeBackend()

rec = Reconciler(backend)

rec._screen_re_render = lambda: None

rec.mount(el)

return rec, backend

def test_mounted_view_routes_events_by_tag() -> None:

pressed: List[int] = []

rec, backend = _mounted(Element("Button", {"title": "Go", "on_press": lambda: pressed.append(1)}, []))

tag = rec.root_tag()

assert tag is not None

# The native payload carries the marker, never the closure.

button = backend.views[tag]

assert "on_press" not in button.props

assert button.props[EVENTS_PROP] == frozenset({"on_press"})

assert dispatch_event(tag, "on_press") is True

assert pressed == [1]

def test_event_args_forwarded_to_callback() -> None:

seen: List[Any] = []

rec, _backend = _mounted(Element("TextInput", {"on_change": seen.append}, []))

tag = rec.root_tag()

assert tag is not None

dispatch_event(tag, "on_change", "hello")

assert seen == ["hello"]

def test_destroy_clears_event_registrations() -> None:

pressed: List[int] = []

rec, _backend = _mounted(Element("Button", {"title": "Go", "on_press": lambda: pressed.append(1)}, []))

tag = rec.root_tag()

assert tag is not None

rec.unmount()

assert dispatch_event(tag, "on_press") is False

assert pressed == []

assert get_event_registry().get(tag, "on_press") is None

def test_listener_removal_updates_marker_prop() -> None:

rec, backend = _mounted(Element("Button", {"title": "Go", "on_press": lambda: None}, []))

tag = rec.root_tag()

assert tag is not None

# Dropping the listener must update _pn_events so handlers can

# unwire, and dispatch must stop routing.

rec.reconcile(Element("Button", {"title": "Go"}, []))

assert event_names(backend.views[tag].props) == frozenset()

assert dispatch_event(tag, "on_press") is False

pythonnative/tests/test_events.py at preview-api-reference-fix · andevsr/pythonnative · GitHub

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