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from __future__ import annotations
import logging
import os
import platform
import sys
from types import ModuleType
from typing import Any, Callable, cast
from typing_extensions import Literal, TypeAlias
from webview import WebViewException
GUIType: TypeAlias = Literal['qt', 'gtk', 'cef', 'mshtml', 'edgechromium', 'android']
logger = logging.getLogger('pywebview')
guilib: ModuleType | None = None
forced_gui_: GUIType | None = None
def initialize(forced_gui: GUIType | None = None):
def import_android():
global guilib
try:
import webview.platforms.android as guilib
logger.debug('Using Kivy')
return True
except (ImportError, ValueError):
logger.exception('Kivy cannot be loaded')
return False
def import_gtk():
global guilib
try:
import webview.platforms.gtk as guilib
logger.debug('Using GTK')
return True
except (ImportError, ValueError):
logger.exception('GTK cannot be loaded')
return False
def import_qt():
global guilib
try:
import webview.platforms.qt as guilib
return True
except ImportError:
logger.exception('QT cannot be loaded')
return False
def import_cocoa():
global guilib
try:
import webview.platforms.cocoa as guilib
return True
except ImportError:
logger.exception('PyObjC cannot be loaded')
return False
def import_winforms():
global guilib
try:
import webview.platforms.winforms as guilib
return True
except ImportError:
logger.exception('pythonnet cannot be loaded')
return False
def try_import(guis: list[Callable[[], Any]]) -> bool:
while guis:
import_func = guis.pop(0)
if import_func():
return True
return False
global forced_gui_
if not forced_gui:
forced_gui = 'qt' if 'KDE_FULL_SESSION' in os.environ else None
forced_gui = cast(
GUIType,
os.environ['PYWEBVIEW_GUI'].lower()
if 'PYWEBVIEW_GUI' in os.environ
and os.environ['PYWEBVIEW_GUI'].lower()
in ['qt', 'gtk', 'cef', 'mshtml', 'edgechromium']
else forced_gui,
)
forced_gui_ = forced_gui
if platform.system() == 'Darwin':
if forced_gui == 'qt':
guis = [import_qt, import_cocoa]
else:
guis = [import_cocoa, import_qt]
if not try_import(guis):
raise WebViewException(
'You must have either PyObjC (for Cocoa support) or Qt with Python bindings installed in order to use pywebview.'
)
elif hasattr(sys, 'getandroidapilevel'):
try_import([import_android])
elif platform.system() == 'Linux' or platform.system() == 'OpenBSD':
if forced_gui == 'qt':
guis = [import_qt, import_gtk]
else:
guis = [import_gtk, import_qt]
if not try_import(guis):
raise WebViewException(
'You must have either QT or GTK with Python extensions installed in order to use pywebview.'
)
elif platform.system() == 'Windows':
if forced_gui == 'qt':
guis = [import_qt, import_winforms]
else:
guis = [import_winforms]
if not try_import(guis):
raise WebViewException('You must have pythonnet installed in order to use pywebview.')
else:
raise WebViewException(
'Unsupported platform. Only Windows, Linux, OS X, OpenBSD are supported.'
)
guilib.setup_app()
return guilib
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