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page.py
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435 lines (331 loc) · 14.5 KB
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"""Page host — the bridge between native lifecycle and function components.
Users no longer subclass ``Page``. Instead they write ``@component``
functions and the native template calls :func:`create_page` to obtain
an :class:`_AppHost` that manages the reconciler and lifecycle.
Usage (user code)::
import pythonnative as pn
@pn.component
def MainPage():
count, set_count = pn.use_state(0)
return pn.Column(
pn.Text(f"Count: {count}", style={"font_size": 24}),
pn.Button("Tap me", on_click=lambda: set_count(count + 1)),
style={"spacing": 12, "padding": 16},
)
The native template calls::
host = pythonnative.page.create_page("app.main_page.MainPage", native_instance)
host.on_create()
"""
import importlib
import json
from typing import Any, Dict, Optional
from .utils import IS_ANDROID, set_android_context
# ======================================================================
# Component path resolution
# ======================================================================
def _resolve_component_path(page_ref: Any) -> str:
"""Resolve a component function to a ``module.name`` path string."""
if isinstance(page_ref, str):
return page_ref
func = getattr(page_ref, "__wrapped__", page_ref)
module = getattr(func, "__module__", None)
name = getattr(func, "__name__", None)
if module and name:
return f"{module}.{name}"
raise ValueError(f"Cannot resolve component path for {page_ref!r}")
def _import_component(component_path: str) -> Any:
"""Import and return the component function from a dotted path."""
module_path, component_name = component_path.rsplit(".", 1)
module = importlib.import_module(module_path)
return getattr(module, component_name)
# ======================================================================
# Shared helpers
# ======================================================================
def _init_host_common(host: Any) -> None:
host._args = {}
host._reconciler = None
host._root_native_view = None
def _on_create(host: Any) -> None:
from .hooks import NavigationHandle, Provider, _NavigationContext
from .native_views import get_registry
from .reconciler import Reconciler
host._reconciler = Reconciler(get_registry())
host._reconciler._page_re_render = lambda: _re_render(host)
nav_handle = NavigationHandle(host)
app_element = host._component()
provider_element = Provider(_NavigationContext, nav_handle, app_element)
host._root_native_view = host._reconciler.mount(provider_element)
host._attach_root(host._root_native_view)
def _re_render(host: Any) -> None:
from .hooks import NavigationHandle, Provider, _NavigationContext
nav_handle = NavigationHandle(host)
app_element = host._component()
provider_element = Provider(_NavigationContext, nav_handle, app_element)
new_root = host._reconciler.reconcile(provider_element)
if new_root is not host._root_native_view:
host._detach_root(host._root_native_view)
host._root_native_view = new_root
host._attach_root(new_root)
def _set_args(host: Any, args: Any) -> None:
if isinstance(args, str):
try:
host._args = json.loads(args) or {}
except Exception:
host._args = {}
return
host._args = args if isinstance(args, dict) else {}
# ======================================================================
# Platform implementations
# ======================================================================
if IS_ANDROID:
from java import jclass
class _AppHost:
"""Android host backed by an Activity and Fragment navigation."""
def __init__(self, native_instance: Any, component_func: Any) -> None:
self.native_instance = native_instance
self._component = component_func
set_android_context(native_instance)
_init_host_common(self)
def on_create(self) -> None:
_on_create(self)
def on_start(self) -> None:
pass
def on_resume(self) -> None:
pass
def on_pause(self) -> None:
pass
def on_stop(self) -> None:
pass
def on_destroy(self) -> None:
pass
def on_restart(self) -> None:
pass
def on_save_instance_state(self) -> None:
pass
def on_restore_instance_state(self) -> None:
pass
def set_args(self, args: Any) -> None:
_set_args(self, args)
def _get_nav_args(self) -> Dict[str, Any]:
return self._args
def _push(self, page: Any, args: Optional[Dict[str, Any]] = None) -> None:
page_path = _resolve_component_path(page)
Navigator = jclass(f"{self.native_instance.getPackageName()}.Navigator")
args_json = json.dumps(args) if args else None
Navigator.push(self.native_instance, page_path, args_json)
def _pop(self) -> None:
try:
Navigator = jclass(f"{self.native_instance.getPackageName()}.Navigator")
Navigator.pop(self.native_instance)
except Exception:
self.native_instance.finish()
def _attach_root(self, native_view: Any) -> None:
try:
from .utils import get_android_fragment_container
container = get_android_fragment_container()
try:
container.removeAllViews()
except Exception:
pass
LayoutParams = jclass("android.view.ViewGroup$LayoutParams")
lp = LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT)
container.addView(native_view, lp)
except Exception:
self.native_instance.setContentView(native_view)
def _detach_root(self, native_view: Any) -> None:
try:
from .utils import get_android_fragment_container
container = get_android_fragment_container()
container.removeAllViews()
except Exception:
pass
else:
from typing import Dict as _Dict
_rubicon_available = False
try:
from rubicon.objc import ObjCClass, ObjCInstance
_rubicon_available = True
import gc as _gc
_gc.disable()
except ImportError:
pass
_IOS_PAGE_REGISTRY: _Dict[int, Any] = {}
def _ios_register_page(vc_instance: Any, host_obj: Any) -> None:
try:
ptr = int(vc_instance.ptr)
_IOS_PAGE_REGISTRY[ptr] = host_obj
except Exception:
pass
def _ios_unregister_page(vc_instance: Any) -> None:
try:
ptr = int(vc_instance.ptr)
_IOS_PAGE_REGISTRY.pop(ptr, None)
except Exception:
pass
def forward_lifecycle(native_addr: int, event: str) -> None:
"""Forward a lifecycle event from Swift ViewController to the registered host."""
host = _IOS_PAGE_REGISTRY.get(int(native_addr))
if host is None:
return
handler = getattr(host, event, None)
if handler:
handler()
if _rubicon_available:
class _AppHost:
"""iOS host backed by a UIViewController."""
def __init__(self, native_instance: Any, component_func: Any) -> None:
if isinstance(native_instance, int):
try:
native_instance = ObjCInstance(native_instance)
except Exception:
native_instance = None
self.native_instance = native_instance
self._component = component_func
_init_host_common(self)
if self.native_instance is not None:
_ios_register_page(self.native_instance, self)
def on_create(self) -> None:
_on_create(self)
def on_start(self) -> None:
pass
def on_resume(self) -> None:
pass
def on_pause(self) -> None:
pass
def on_stop(self) -> None:
pass
def on_destroy(self) -> None:
if self.native_instance is not None:
_ios_unregister_page(self.native_instance)
def on_restart(self) -> None:
pass
def on_save_instance_state(self) -> None:
pass
def on_restore_instance_state(self) -> None:
pass
def set_args(self, args: Any) -> None:
_set_args(self, args)
def _get_nav_args(self) -> Dict[str, Any]:
return self._args
def _push(self, page: Any, args: Optional[Dict[str, Any]] = None) -> None:
page_path = _resolve_component_path(page)
ViewController = None
try:
ViewController = ObjCClass("ViewController")
except Exception:
try:
NSBundle = ObjCClass("NSBundle")
bundle = NSBundle.mainBundle
module_name = bundle.objectForInfoDictionaryKey_("CFBundleName")
if module_name is None:
module_name = bundle.objectForInfoDictionaryKey_("CFBundleExecutable")
if module_name:
ViewController = ObjCClass(f"{module_name}.ViewController")
except Exception:
pass
if ViewController is None:
raise NameError("ViewController class not found; ensure Swift class is ObjC-visible")
next_vc = ViewController.alloc().init()
try:
next_vc.setValue_forKey_(page_path, "requestedPagePath")
if args:
next_vc.setValue_forKey_(json.dumps(args), "requestedPageArgsJSON")
except Exception:
pass
nav = getattr(self.native_instance, "navigationController", None)
if nav is None:
raise RuntimeError(
"No UINavigationController available; " "ensure template embeds root in navigation controller"
)
nav.pushViewController_animated_(next_vc, True)
def _pop(self) -> None:
nav = getattr(self.native_instance, "navigationController", None)
if nav is not None:
nav.popViewControllerAnimated_(True)
def _attach_root(self, native_view: Any) -> None:
root_view = self.native_instance.view
native_view.setTranslatesAutoresizingMaskIntoConstraints_(False)
root_view.addSubview_(native_view)
try:
safe = root_view.safeAreaLayoutGuide
native_view.topAnchor.constraintEqualToAnchor_(safe.topAnchor).setActive_(True)
native_view.bottomAnchor.constraintEqualToAnchor_(safe.bottomAnchor).setActive_(True)
native_view.leadingAnchor.constraintEqualToAnchor_(safe.leadingAnchor).setActive_(True)
native_view.trailingAnchor.constraintEqualToAnchor_(safe.trailingAnchor).setActive_(True)
except Exception:
native_view.setTranslatesAutoresizingMaskIntoConstraints_(True)
try:
native_view.setFrame_(root_view.bounds)
native_view.setAutoresizingMask_(2 | 16)
except Exception:
pass
def _detach_root(self, native_view: Any) -> None:
try:
native_view.removeFromSuperview()
except Exception:
pass
else:
class _AppHost:
"""Desktop stub — no native runtime available.
Fully functional for testing with a mock backend via
``native_views.set_registry()``.
"""
def __init__(self, native_instance: Any = None, component_func: Any = None) -> None:
self.native_instance = native_instance
self._component = component_func
_init_host_common(self)
def on_create(self) -> None:
_on_create(self)
def on_start(self) -> None:
pass
def on_resume(self) -> None:
pass
def on_pause(self) -> None:
pass
def on_stop(self) -> None:
pass
def on_destroy(self) -> None:
pass
def on_restart(self) -> None:
pass
def on_save_instance_state(self) -> None:
pass
def on_restore_instance_state(self) -> None:
pass
def set_args(self, args: Any) -> None:
_set_args(self, args)
def _get_nav_args(self) -> Dict[str, Any]:
return self._args
def _push(self, page: Any, args: Optional[Dict[str, Any]] = None) -> None:
raise RuntimeError("push() requires a native runtime (iOS or Android)")
def _pop(self) -> None:
raise RuntimeError("pop() requires a native runtime (iOS or Android)")
def _attach_root(self, native_view: Any) -> None:
pass
def _detach_root(self, native_view: Any) -> None:
pass
# ======================================================================
# Public factory
# ======================================================================
def create_page(
component_path: str,
native_instance: Any = None,
args_json: Optional[str] = None,
) -> _AppHost:
"""Create a page host for a function component.
Called by native templates (PageFragment.kt / ViewController.swift)
to bridge the native lifecycle to a ``@component`` function.
Parameters
----------
component_path:
Dotted Python path to the component, e.g. ``"app.main_page.MainPage"``.
native_instance:
The native Activity (Android) or ViewController pointer (iOS).
args_json:
Optional JSON string of navigation arguments.
"""
component_func = _import_component(component_path)
host = _AppHost(native_instance, component_func)
if args_json:
_set_args(host, args_json)
return host