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page.py
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468 lines (352 loc) · 14.8 KB
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"""Page — the root component that bridges native lifecycle and declarative UI.
A ``Page`` subclass is the entry point for each screen. It owns a
:class:`~pythonnative.reconciler.Reconciler` and automatically mounts /
re-renders the element tree returned by :meth:`render` whenever state
changes.
Usage::
import pythonnative as pn
class MainPage(pn.Page):
def __init__(self, native_instance):
super().__init__(native_instance)
self.state = {"count": 0}
def increment(self):
self.set_state(count=self.state["count"] + 1)
def render(self):
return pn.Column(
pn.Text(f"Count: {self.state['count']}", font_size=24),
pn.Button("Increment", on_click=self.increment),
spacing=12,
padding=16,
)
"""
import json
from abc import ABC, abstractmethod
from typing import Any, Optional, Union
from .utils import IS_ANDROID, set_android_context
# ======================================================================
# Base class (platform-independent)
# ======================================================================
class PageBase(ABC):
"""Abstract base defining the Page interface."""
@abstractmethod
def __init__(self) -> None:
super().__init__()
@abstractmethod
def render(self) -> Any:
"""Return an Element tree describing this page's UI."""
def set_state(self, **updates: Any) -> None:
"""Merge *updates* into ``self.state`` and trigger a re-render."""
def on_create(self) -> None:
"""Called when the page is first created. Triggers initial render."""
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
@abstractmethod
def set_args(self, args: Optional[dict]) -> None:
pass
@abstractmethod
def push(self, page: Union[str, Any], args: Optional[dict] = None) -> None:
pass
@abstractmethod
def pop(self) -> None:
pass
def get_args(self) -> dict:
"""Return navigation arguments (empty dict if none)."""
return getattr(self, "_args", {})
def navigate_to(self, page: Any) -> None:
self.push(page)
# ======================================================================
# Shared declarative rendering helpers
# ======================================================================
def _init_page_common(page: Any) -> None:
"""Common initialisation shared by both platform Page classes."""
page.state = {}
page._args = {}
page._reconciler = None
page._root_native_view = None
def _set_state(page: Any, **updates: Any) -> None:
page.state.update(updates)
if page._reconciler is not None:
_re_render(page)
def _on_create(page: Any) -> None:
from .native_views import get_registry
from .reconciler import Reconciler
page._reconciler = Reconciler(get_registry())
element = page.render()
page._root_native_view = page._reconciler.mount(element)
page._attach_root(page._root_native_view)
def _re_render(page: Any) -> None:
element = page.render()
new_root = page._reconciler.reconcile(element)
if new_root is not page._root_native_view:
page._detach_root(page._root_native_view)
page._root_native_view = new_root
page._attach_root(new_root)
def _resolve_page_path(page_ref: Union[str, Any]) -> str:
if isinstance(page_ref, str):
return page_ref
module = getattr(page_ref, "__module__", None)
name = getattr(page_ref, "__name__", None)
if module and name:
return f"{module}.{name}"
cls = page_ref.__class__
return f"{cls.__module__}.{cls.__name__}"
def _set_args(page: Any, args: Optional[dict]) -> None:
if isinstance(args, str):
try:
page._args = json.loads(args) or {}
except Exception:
page._args = {}
return
page._args = args or {}
# ======================================================================
# Platform implementations
# ======================================================================
if IS_ANDROID:
from java import jclass
class Page(PageBase):
"""Android Page backed by an Activity and Fragment navigation."""
def __init__(self, native_instance: Any) -> None:
super().__init__()
self.native_class = jclass("android.app.Activity")
self.native_instance = native_instance
set_android_context(native_instance)
_init_page_common(self)
def render(self) -> Any:
raise NotImplementedError("Page subclass must implement render()")
def set_state(self, **updates: Any) -> None:
_set_state(self, **updates)
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: Optional[dict]) -> None:
_set_args(self, args)
def push(self, page: Union[str, Any], args: Optional[dict] = None) -> None:
page_path = _resolve_page_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, page_obj: Any) -> None:
try:
ptr = int(vc_instance.ptr)
_IOS_PAGE_REGISTRY[ptr] = page_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 Page."""
page = _IOS_PAGE_REGISTRY.get(int(native_addr))
if page is None:
return
handler = getattr(page, event, None)
if handler:
handler()
if _rubicon_available:
class Page(PageBase):
"""iOS Page backed by a UIViewController."""
def __init__(self, native_instance: Any) -> None:
super().__init__()
self.native_class = ObjCClass("UIViewController")
if isinstance(native_instance, int):
try:
native_instance = ObjCInstance(native_instance)
except Exception:
native_instance = None
self.native_instance = native_instance
_init_page_common(self)
if self.native_instance is not None:
_ios_register_page(self.native_instance, self)
def render(self) -> Any:
raise NotImplementedError("Page subclass must implement render()")
def set_state(self, **updates: Any) -> None:
_set_state(self, **updates)
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: Optional[dict]) -> None:
_set_args(self, args)
def push(self, page: Union[str, Any], args: Optional[dict] = None) -> None:
page_path = _resolve_page_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 Page(PageBase):
"""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) -> None:
super().__init__()
self.native_instance = native_instance
_init_page_common(self)
def render(self) -> Any:
raise NotImplementedError("Page subclass must implement render()")
def set_state(self, **updates: Any) -> None:
_set_state(self, **updates)
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: Optional[dict]) -> None:
_set_args(self, args)
def push(self, page: Union[str, Any], args: Optional[dict] = 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