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

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"""Unit tests for the new components: StatusBar, KeyboardAvoidingView, Picker, Sectionlist, etc."""

from __future__ import annotations

from typing import Any, Tuple

from fake_backend import FakeBackend

from pythonnative.components import (

FlatList,

KeyboardAvoidingView,

Picker,

RefreshControl,

SectionList,

StatusBar,

Text,

)

from pythonnative.element import Element

from pythonnative.reconciler import Reconciler

def _mount(el: Element) -> Tuple[Any, Reconciler, FakeBackend]:

backend = FakeBackend()

rec = Reconciler(backend)

rec._screen_re_render = lambda: None

root = rec.mount(el)

return root, rec, backend

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

# StatusBar

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

def test_status_bar_default() -> None:

el = StatusBar()

assert el.type == "StatusBar"

assert el.children == []

assert el.props == {}

def test_status_bar_style_and_hidden() -> None:

el = StatusBar(bar_style="dark", background_color="#FFFFFF", hidden=False)

assert el.props["bar_style"] == "dark"

assert el.props["background_color"] == "#FFFFFF"

assert el.props["hidden"] is False

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

# KeyboardAvoidingView

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

def test_keyboard_avoiding_default_behavior() -> None:

el = KeyboardAvoidingView(Text("hi"))

assert callable(el.type) # hook-driven composite

assert el.props["behavior"] == "padding"

assert len(el.props["children"]) == 1

_, _, backend = _mount(el)

inner = [v for v in backend.views.values() if v.type_name == "KeyboardAvoidingView"]

assert len(inner) == 1

def test_keyboard_avoiding_custom_behavior() -> None:

el = KeyboardAvoidingView(Text("hi"), behavior="position")

assert el.props["behavior"] == "position"

def test_keyboard_avoiding_padding_follows_keyboard_height() -> None:

from pythonnative import platform_metrics

platform_metrics.reset_keyboard_height()

try:

_, rec, backend = _mount(KeyboardAvoidingView(Text("hi"), style={"padding_bottom": 4}))

view = next(v for v in backend.views.values() if v.type_name == "KeyboardAvoidingView")

assert view.props.get("padding_bottom") == 4

platform_metrics.set_keyboard_height(250.0)

rec.flush_dirty()

view = next(v for v in backend.views.values() if v.type_name == "KeyboardAvoidingView")

assert view.props.get("padding_bottom") == 254.0

platform_metrics.set_keyboard_height(0.0)

rec.flush_dirty()

view = next(v for v in backend.views.values() if v.type_name == "KeyboardAvoidingView")

assert view.props.get("padding_bottom") == 4

finally:

platform_metrics.reset_keyboard_height()

def test_keyboard_avoiding_position_translates_upward() -> None:

from pythonnative import platform_metrics

platform_metrics.reset_keyboard_height()

try:

_, rec, backend = _mount(KeyboardAvoidingView(Text("hi"), behavior="position", keyboard_vertical_offset=50.0))

platform_metrics.set_keyboard_height(250.0)

rec.flush_dirty()

view = next(v for v in backend.views.values() if v.type_name == "KeyboardAvoidingView")

assert view.props.get("transform") == [{"translate_y": -200.0}]

finally:

platform_metrics.reset_keyboard_height()

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

# RefreshControl

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

def test_refresh_control_dict_shape() -> None:

cb = lambda: None # noqa: E731

spec = RefreshControl(refreshing=True, on_refresh=cb, tint_color="#FF0000")

assert isinstance(spec, dict)

assert spec["refreshing"] is True

assert spec["on_refresh"] is cb

assert spec["tint_color"] == "#FF0000"

def test_refresh_control_minimal() -> None:

spec = RefreshControl()

assert spec == {"refreshing": False}

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

# Picker

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

def test_picker_creates_native_picker_element() -> None:

cb = lambda _: None # noqa: E731

el = Picker(

value="b",

items=[

{"value": "a", "label": "Apple"},

{"value": "b", "label": "Banana"},

on_change=cb,

)

assert el.type == "Picker"

assert el.props["value"] == "b"

assert el.props["on_change"] is cb

assert el.props["items"] == [

{"value": "a", "label": "Apple"},

{"value": "b", "label": "Banana"},

]

def test_picker_default_placeholder_in_props() -> None:

el = Picker(items=[{"value": "a", "label": "Apple"}])

assert el.props["placeholder"] == "Select…"

assert el.props["items"] == [{"value": "a", "label": "Apple"}]

def test_picker_empty_when_no_items() -> None:

el = Picker()

assert el.props["items"] == []

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

# Virtualized FlatList (Python-windowed over ScrollView)

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

def test_flatlist_small_list_mounts_every_row() -> None:

items = [{"id": i, "name": f"Item {i}"} for i in range(3)]

el = FlatList(

data=items,

render_item=lambda item, _i: Text(item["name"]),

key_extractor=lambda item, _i: str(item["id"]),

)

rows = el.props["rows"]

assert [r.key for r in rows] == ["0", "1", "2"]

root, _rec, _backend = _mount(el)

assert root.type_name == "ScrollView"

texts = [v.props["text"] for v in root.find_all("Text")]

assert texts == ["Item 0", "Item 1", "Item 2"]

def test_flatlist_windows_large_lists() -> None:

items = list(range(1000))

el = FlatList(

data=items,

item_height=44,

render_item=lambda item, _i: Text(f"row-{item}"),

key_extractor=lambda item, _i: str(item),

)

rows = el.props["rows"]

assert len(rows) == 1000

assert rows[0].extent == 44.0

root, _rec, _backend = _mount(el)

mounted = root.find_all("Text")

# Only the initial window (plus overscan) is mounted, not all 1000.

assert 0 < len(mounted) < 200

texts = {v.props["text"] for v in mounted}

assert "row-0" in texts

assert "row-999" not in texts

def test_flatlist_window_shifts_on_scroll() -> None:

from pythonnative.events import dispatch_event

items = list(range(500))

el = FlatList(

data=items,

item_height=44,

render_item=lambda item, _i: Text(f"row-{item}"),

key_extractor=lambda item, _i: str(item),

)

root, rec, _backend = _mount(el)

assert "row-0" in {v.props["text"] for v in root.find_all("Text")}

# Simulate the native scroll event landing deep in the list, then

# flush the dirty component to re-render the shifted window.

scroll_tag = rec.root_tag()

assert dispatch_event(scroll_tag, "on_scroll", {"x": 0.0, "y": 44.0 * 300}) is True

rec.flush_dirty()

texts = {v.props["text"] for v in root.find_all("Text")}

assert "row-300" in texts

assert "row-0" not in texts, "rows far behind the window must be unmounted"

def test_flatlist_separator_adds_to_row_extent() -> None:

el = FlatList(

data=[1, 2, 3],

item_height=20,

separator_height=4,

)

assert [r.extent for r in el.props["rows"]] == [24.0, 24.0, 24.0]

assert el.props["estimated_row_extent"] == 24.0

def test_flatlist_with_refresh_control() -> None:

el = FlatList(

data=[1, 2],

item_height=20,

refresh_control={"refreshing": True, "on_refresh": lambda: None},

)

assert el.props["refresh_control"]["refreshing"] is True

# The spec flows through to the mounted ScrollView (callback hoisted

# to the event registry, data props kept).

root, _rec, _backend = _mount(el)

assert root.props["refresh_control"] == {"refreshing": True}

assert "on_refresh" in root.props["_pn_events"]

def test_flatlist_scroll_controller_attached_to_ref() -> None:

from pythonnative.hooks import Ref

from pythonnative.native_views import set_registry

ref: Ref = Ref()

el = FlatList(data=[1, 2, 3], item_height=20, ref=ref)

_root, _rec, backend = _mount(el)

controller = ref.current

assert controller is not None, "mount must publish a ListController on the ref"

# Imperative scroll commands resolve through the process registry.

set_registry(backend) # type: ignore[arg-type]

try:

controller.scroll_to_index(2, animated=False)

finally:

set_registry(None)

assert backend.commands, "scroll_to_index must dispatch a native command"

_tag, name, args = backend.commands[-1]

assert name == "scroll_to_offset"

assert args["y"] == 40.0 # two rows of 20pt scrolled past

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

# SectionList

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

def test_section_list_flattens_headers_and_items() -> None:

sections = [

{"title": "A", "data": ["a1", "a2"]},

{"title": "B", "data": ["b1"]},

]

el = SectionList(sections=sections)

# 2 headers + 3 items = 5 rows.

assert len(el.props["rows"]) == 5

root, _rec, _backend = _mount(el)

texts = [v.props["text"] for v in root.find_all("Text")]

assert texts == ["A", "a1", "a2", "B", "b1"]

def test_section_list_header_and_item_extents() -> None:

sections = [

{"title": "X", "data": list(range(50))},

{"title": "Y", "data": list(range(50))},

]

el = SectionList(sections=sections, item_height=30, section_header_height=40)

rows = el.props["rows"]

# 2 headers + 100 items.

assert len(rows) == 102

assert rows[0].extent == 40.0 # header

assert rows[1].extent == 30.0 # item

# Large flattened list still windows.

root, _rec, _backend = _mount(el)

assert 0 < len(root.find_all("Text")) < 102

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

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