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[英]PySide2/Qt for python : The GUI freezes when i click the button
[英]How to detect button click inside Qwebengine in pyside2
我用pyside2編寫了一個應用程序,該應用程序在QWebEngine中打開了一個網頁。
該網頁有2個按鈕,我不了解如何在pyside2應用模塊中檢測到按鈕單擊,我需要對該按鈕單擊執行其他操作。
例
下面是我的代碼
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_()
以下是輸出:
現在,我只想在用戶單擊“開始”按鈕時關閉我的應用程序。
QWebEnginePage
允許您執行js,因此您可以找到按鈕 (例如id),並將其鏈接到回調,但這僅允許您在js中執行,而您希望在python中執行,因此解決方案是使用QWebChannel
導出QObject
並調用將關閉回調窗口的函數。 加載頁面后必須完成對象的導出,因此必須使用loadFinished
信號。
在我的示例中,我使用一個按鈕來指示窗口是否已正確加載,因此如果按鈕為紅色,則必須按下該按鈕。
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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