from __future__ import absolute_import, division, print_function
from PySide2.QtCore import QTimer
from PySide2.QtWebEngineWidgets import QWebEngineView, QWebEnginePage
import sys, os
WeblglChecklibpath = os.path.join(os.path.dirname(os.path.abspath(__file__)), "webgl_check.js")
htmlstr1 = """
Detect webgl
This is a test for webgl
"""
# some documentation for chromium flags
# https://peter.sh/experiments/chromium-command-line-switches
flgs = os.environ.get("QTWEBENGINE_CHROMIUM_FLAGS", "")
os.environ["QTWEBENGINE_CHROMIUM_FLAGS"] = flgs + " --single-process" # necessary for detecting webgl abilities on Mac
class MyQWebEnginePage(QWebEnginePage):
def __init__(self, *args, **kwargs):
QWebEnginePage.__init__(self, *args, **kwargs)
def javaScriptConsoleMessage(self,level, message, lineNumber, sourceID):
print(message)
self.webglsupport = True
if message == 'WebGL error':
self.webglsupport = False
return super(MyQWebEnginePage,self).javaScriptConsoleMessage(level, message, lineNumber, sourceID)
def javaScriptAlert(self,securityOrigin,msg):
print(msg)
return super(MyQWebEnginePage,self).javaScriptAlert(securityOrigin,msg)
if (__name__ == "__main__") :
from PySide2.QtWidgets import QApplication
app1 = QApplication(sys.argv)
webglcheckscript = ""
with open(WeblglChecklibpath, "r") as f:
webglcheckscript = f.read()
assert webglcheckscript != ""
#app1.aboutToQuit.connect(lambda :print("about to quit"))
print("QTWEBENGINE_CHROMIUM_FLAGS = %s" %os.environ["QTWEBENGINE_CHROMIUM_FLAGS"] )
# give the browser time to instatiate and then close down gracefully
QTimer.singleShot(10000, app1.quit ) # in case pageloadFinished() is never executed
browser = QWebEngineView()
webpage = MyQWebEnginePage(browser)
browser.setPage(webpage)
def pageloadFinished( ok):
#import code, traceback; code.interact(local=locals(), banner="".join( traceback.format_stack(limit=10) ) )
browser.page().runJavaScript(webglcheckscript)
# give the script time to run and then close us down gracefully
QTimer.singleShot(1000, app1.quit )
webpage.loadFinished.connect(pageloadFinished)
webpage.setHtml(htmlstr1)
browser.hide() # show() or hide() is necessary for loading the html page
app1.exec_()