如何检测pyside2中的Qwebengine内部的按钮单击 [英] How to detect button click inside Qwebengine in pyside2
问题描述
我用pyside2编写了一个应用程序，该应用程序在QWebEngine中打开了一个网页.
I wrote an app in pyside2, which opening a webpage in QWebEngine.
该网页有2个按钮，我不了解如何在pyside2应用模块中检测到按钮单击，我需要对该按钮单击执行其他操作.
That web page has 2 buttons, I am not understanding how can I detect a button click in pyside2 app module, I need to perform other operation on that button click.
示例
下面是我的代码
from PySide2.QtWidgets import QApplication
from PySide2.QtWebEngineWidgets import QWebEngineView, QWebEnginePage
from PySide2.QtCore import QUrl
class WebEnginePage(QWebEnginePage):
def __init__(self, *args, **kwargs):
QWebEnginePage.__init__(self, *args, **kwargs)
self.featurePermissionRequested.connect(self.onFeaturePermissionRequested)
def onFeaturePermissionRequested(self, url, feature):
if feature in (QWebEnginePage.MediaAudioCapture,
QWebEnginePage.MediaVideoCapture,
QWebEnginePage.MediaAudioVideoCapture):
self.setFeaturePermission(url, feature, QWebEnginePage.PermissionGrantedByUser)
else:
self.setFeaturePermission(url, feature, QWebEnginePage.PermissionDeniedByUser)
app = QApplication([])
view = QWebEngineView()
page = WebEnginePage()
page.profile().clearHttpCache()
view.setPage(page)
view.load(QUrl("https://test.webrtc.org/"))
view.show()
app.exec_()
下面是输出:
现在，我只想在用户单击开始"按钮时关闭我的应用程序.
Now I just want to close my application when a user clicks "start" button.
推荐答案
QWebEnginePage允许您执行js，因此您可以找到 button 例如ID，并将其链接到回调，但是这将只允许您在js中执行它，而您想在python中执行它，因此解决方案是使用QWebChannel导出QObject并调用将在回调函数中关闭窗口的函数.必须在加载页面后完成对象的导出，因此必须使用loadFinished信号.
QWebEnginePage allows you to execute js so you could find the button for example the id, and link it to a callback but this will only allow you to execute it in js, and you want to do it in python, so the solution is to use QWebChannel to export a QObject and call the function that will close the window in the callback. The export of the object must be done after loading the page so the loadFinished signal must be used.
在我的示例中，我使用一个按钮来指示窗口是否已正确加载，因此如果按钮为红色，则必须按该按钮.
In my example I use a button to indicate if the window has been loaded correctly, so you must press the button if the button is red.
from PySide2 import QtCore, QtWidgets, QtWebEngineWidgets, QtWebChannel
class WebEnginePage(QtWebEngineWidgets.QWebEnginePage):
def __init__(self, *args, **kwargs):
super(WebEnginePage, self).__init__(*args, **kwargs)
self.loadFinished.connect(self.onLoadFinished)
@QtCore.Slot(bool)
def onLoadFinished(self, ok):
print("Finished loading: ", ok)
if ok:
self.load_qwebchannel()
self.run_scripts_on_load()
def load_qwebchannel(self):
file = QtCore.QFile(":/qtwebchannel/qwebchannel.js")
if file.open(QtCore.QIODevice.ReadOnly):
content = file.readAll()
file.close()
self.runJavaScript(content.data().decode())
if self.webChannel() is None:
channel = QtWebChannel.QWebChannel(self)
self.setWebChannel(channel)
def add_objects(self, objects):
if self.webChannel() is not None:
initial_script = ""
end_script = ""
self.webChannel().registerObjects(objects)
for name, obj in objects.items():
initial_script += "var {helper};".format(helper=name)
end_script += "{helper} = channel.objects.{helper};".format(helper=name)
js = initial_script + \
"new QWebChannel(qt.webChannelTransport, function (channel) {" + \
end_script + \
"} );"
self.runJavaScript(js)
def run_scripts_on_load(self):
pass
class WebRTCPageView(WebEnginePage):
def __init__(self, *args, **kwargs):
super(WebRTCPageView, self).__init__(*args, **kwargs)
self.featurePermissionRequested.connect(self.onFeaturePermissionRequested)
self.load(QtCore.QUrl("https://test.webrtc.org/"))
@QtCore.Slot(QtCore.QUrl, QtWebEngineWidgets.QWebEnginePage.Feature)
def onFeaturePermissionRequested(self, url, feature):
if feature in (QtWebEngineWidgets.QWebEnginePage.MediaAudioCapture,
QtWebEngineWidgets.QWebEnginePage.MediaVideoCapture,
QtWebEngineWidgets.QWebEnginePage.MediaAudioVideoCapture):
self.setFeaturePermission(url, feature, QtWebEngineWidgets.QWebEnginePage.PermissionGrantedByUser)
else:
self.setFeaturePermission(url, feature, QtWebEngineWidgets.WebEnginePage.PermissionDeniedByUser)
def run_scripts_on_load(self):
if self.url() == QtCore.QUrl("https://test.webrtc.org/"):
self.add_objects({"jshelper": self})
js = '''
var button = document.getElementById("startButton");
button.addEventListener("click", function(){ jshelper.on_clicked() });
'''
self.runJavaScript(js)
@QtCore.Slot()
def on_clicked(self):
print("clicked on startButton")
QtCore.QCoreApplication.quit()
if __name__ == '__main__':
import sys
app = QtWidgets.QApplication(sys.argv)
w = QtWidgets.QWidget()
lay = QtWidgets.QVBoxLayout(w)
button = QtWidgets.QToolButton()
button.setStyleSheet('''
QToolButton{
border: 1px;
border-color: black;
border-style: outset
}
QToolButton[success="true"]{
background-color: red;
}
QToolButton[success="false"]{
background-color: green;
}
''')
def refresh_button(ok):
button.setProperty("success", ok)
button.style().unpolish(button)
button.style().polish(button)
refresh_button(False)
view = QtWebEngineWidgets.QWebEngineView()
page = WebRTCPageView()
page.profile().clearHttpCache()
view.setPage(page)
progressbar = QtWidgets.QProgressBar()
page.loadProgress.connect(progressbar.setValue)
page.loadFinished.connect(refresh_button)
hlay = QtWidgets.QHBoxLayout()
hlay.addWidget(progressbar)
hlay.addWidget(button)
lay.addWidget(view)
lay.addLayout(hlay)
w.resize(640, 480)
w.show()
sys.exit(app.exec_())
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