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import asyncio
import threading
from multiprocessing import Process, Queue
from .asynchronous import handle_task_result
try:
import webview
except ImportError as err:
msg = "server.start(exec_mode='desktop', ...) requires pywebview>=3.4"
raise ImportError(msg) from err
WINDOW_ARGS = [
"html",
"js_api",
"width",
"height",
"x",
"y",
"screen",
"resizable",
"fullscreen",
"min_size",
"hidden",
"frameless",
"easy_drag",
"focus",
"minimized",
"maximized",
"on_top",
"confirm_close",
"background_color",
"transparent",
"text_select",
"zoomable",
"draggable",
"vibrancy",
"server",
"server_args",
"localization",
]
def filter_dict(dict_to_filter, key_list):
return {k: dict_to_filter[k] for k in key_list if k in dict_to_filter}
def to_menu(menu_struct, fn_menu_click):
if isinstance(menu_struct, list):
return [to_menu(item, fn_menu_click) for item in menu_struct]
if isinstance(menu_struct, str):
return webview.menu.MenuSeparator()
if isinstance(menu_struct, tuple):
label, item = menu_struct
if isinstance(item, list):
return webview.menu.Menu(label, to_menu(item, fn_menu_click))
if isinstance(item, str):
return webview.menu.MenuAction(label, lambda: fn_menu_click(item))
return None
class BrowserProcess(Process):
def __init__(
self,
title=None,
port=None,
msg_queue=None,
action_queue=None,
debug=False,
gui=None,
menu=None,
**kwargs,
):
Process.__init__(self)
self._title = title
self._port = port
self._msg_queue = msg_queue
self._action_queue = action_queue
self._menu = menu or []
self._window_args = filter_dict(kwargs, WINDOW_ARGS)
self._main_window = None
# start args
self._debug = debug
self._gui = gui
self._monitoring = True
def exit(self):
# It does not appear that we need to destroy the window
self._monitoring = False
self._msg_queue.put("closing")
def menu_click(self, name):
self._msg_queue.put(f"menu:{name}")
async def _monitor_action_requests(self):
while self._monitoring:
await asyncio.sleep(0.5)
if not self._action_queue.empty():
msg = self._action_queue.get_nowait()
action = msg.get("action")
args = msg.get("args", [])
kwargs = msg.get("kwargs", {})
fn = getattr(self._main_window, action)
if action == "destroy":
self.exit()
fn(*args, **kwargs)
def run_in_thread(self, loop):
asyncio.set_event_loop(loop)
task = loop.create_task(self._monitor_action_requests())
task.add_done_callback(handle_task_result)
loop.run_until_complete(task)
def run(self):
self._main_window = webview.create_window(
title=self._title,
url=f"http://localhost:{self._port}/index.html",
**self._window_args,
)
if hasattr(self._main_window, "events"):
# Newer versions of pywebview (>=3.6) use window.events.closing
self._main_window.events.closing += self.exit
else:
# Older versions (around pywebview<=3.5) use window.closing
self._main_window.closing += self.exit
event_loop = asyncio.new_event_loop()
thread = threading.Thread(target=lambda: self.run_in_thread(event_loop))
webview.start(
menu=to_menu(self._menu, self.menu_click),
func=lambda: thread.start(),
debug=self._debug,
gui=self._gui,
)
def start_browser(server, **kwargs):
_msg_queue = Queue()
_window_action_queue = Queue()
_on_msg = kwargs.get("on_message")
async def process_msg():
keep_processing = True
while keep_processing:
await asyncio.sleep(0.5)
if not _msg_queue.empty():
msg = _msg_queue.get_nowait()
if _on_msg:
_on_msg(msg)
if msg == "closing":
keep_processing = False
await server.stop()
task = asyncio.create_task(process_msg())
task.add_done_callback(handle_task_result)
client_process = BrowserProcess(
title=server.state.trame__title,
port=server.port,
msg_queue=_msg_queue,
action_queue=_window_action_queue,
debug=server.options.get("desktop_debug"),
**kwargs,
)
client_process.start()
def window_call(action, *args, **kwargs):
_window_action_queue.put({"action": action, "args": args, "kwargs": kwargs})
server.controller.pywebview_window_call = window_call
|
