sudo apt安装python3-pyqt5和其他apt安装方法

编程问答 2022-06-10

问题描述

这是错误。

QWebView is not defined

我正在跟踪https://wiki.python.org/moin/PyQt/Embedding%20Widgets%20in%20Web%20Pages上的PyQt4教程。

我了解定义，但是我应该在这里定义什么，在哪里定义？

我将在哪里安装QWebView？

我知道所提供的链接是一个PyQt4示例，并且我正在使用PyQt5。我知道已经有所变化，但是我还没有确切找到答案。

这是一些代码：

import sys
from PyQt5.QtCore import QSize,Qt
from PyQt5.QtGui import *
from PyQt5.QtWebKit import *
from PyQt5.QtWidgets import *

html = \
"""<html>
<head>
<title>Python Web Plugin Test</title>
</head>

<body>
<h1>Python Web Plugin Test</h1>
<object type="x-pyqt/widget" width="200" height="200"></object>
<p>This is a Web plugin written in Python.</p>
</body>
</html>
"""

class WebWidget(QWidget):

    def paintEvent(self,event):
        painter = QPainter()
        painter.begin(self)
        painter.setBrush(Qt.white)
        painter.setPen(Qt.black)
        painter.drawRect(self.rect().adjusted(0,-1,-1))
        painter.setBrush(Qt.red)
        painter.setPen(Qt.nopen)
        painter.drawRect(self.width()/4,self.height()/4,self.width()/2,self.height()/2)
        painter.end()

    def sizeHint(self):
        return QSize(100,100)

class WebPluginFactory(QWebPluginFactory):

    def __init__(self,parent = None):
        QWebPluginFactory.__init__(self,parent)

    def create(self,mimeType,url,names,values):
        if mimeType == "x-pyqt/widget":
            return WebWidget()

    def plugins(self):
        plugin = QWebPluginFactory.Plugin()
        plugin.name = "PyQt Widget"
        plugin.description = "An example Web plugin written with PyQt."
        mimeType = QWebPluginFactory.MimeType()
        mimeType.name = "x-pyqt/widget"
        mimeType.description = "PyQt widget"
        mimeType.fileExtensions = []
        plugin.mimeTypes = [mimeType]
        print("plugins")
        return [plugin]

if __name__ == "__main__":

    app = QApplication(sys.argv)
    QWebSettings.globalSettings().setAttribute(QWebSettings.PluginsEnabled,True)
    view = QWebView()
    factory = WebPluginFactory()
    view.page().setPluginFactory(factory)
    view.setHtml(html)
    view.show()
    sys.exit(app.exec_())

解决方法

要使用QtWebkit，您必须安装软件包python3-pyqt5.qtwebkit。另一方面，从Qt4到Qt5的主要变化是模块的重组，这种情况发生在QtWebKit（分为QtWebKit和QtWebkitWidgets）中，因此QWebView属于最后一个子模块：

import sys
from PyQt5.QtCore import Qt
from PyQt5.QtGui import QPainter
from PyQt5.QtWidgets import QApplication,QWidget
from PyQt5.QtWebKit import QWebPluginFactory,QWebSettings
from PyQt5.QtWebKitWidgets import QWebView

html = """<html>
<head>
<title>Python Web Plugin Test</title>
</head>

<body>
<h1>Python Web Plugin Test</h1>
<object type="x-pyqt/widget" width="200" height="200"></object>
<p>This is a Web plugin written in Python.</p>
</body>
</html>
"""


class WebWidget(QWidget):
    def paintEvent(self,event):
        painter = QPainter()
        painter.begin(self)
        painter.setBrush(Qt.white)
        painter.setPen(Qt.black)
        painter.drawRect(self.rect().adjusted(0,-1,-1))
        painter.setBrush(Qt.red)
        painter.setPen(Qt.NoPen)
        painter.drawRect(
            self.width() / 4,self.height() / 4,self.width() / 2,self.height() / 2
        )
        painter.end()

    def sizeHint(self):
        return QSize(100,100)


class WebPluginFactory(QWebPluginFactory):
    def __init__(self,parent=None):
        QWebPluginFactory.__init__(self,parent)

    def create(self,mimeType,url,names,values):
        if mimeType == "x-pyqt/widget":
            return WebWidget()

    def plugins(self):
        plugin = QWebPluginFactory.Plugin()
        plugin.name = "PyQt Widget"
        plugin.description = "An example Web plugin written with PyQt."
        mimeType = QWebPluginFactory.MimeType()
        mimeType.name = "x-pyqt/widget"
        mimeType.description = "PyQt widget"
        mimeType.fileExtensions = []
        plugin.mimeTypes = [mimeType]
        print("plugins")
        return [plugin]


if __name__ == "__main__":

    app = QApplication(sys.argv)
    QWebSettings.globalSettings().setAttribute(QWebSettings.PluginsEnabled,True)
    view = QWebView()
    factory = WebPluginFactory()
    view.page().setPluginFactory(factory)
    view.setHtml(html)
    view.show()
    sys.exit(app.exec_())

注意：由于Qt 5.6不再正式维护QtWebkit（社区维护了一个fork），因为它已被QtWebEngine取代，因此要使用QtWebkit，必须使用每个发行版的官方存储库或手动编译。 QtWebEngine无法实现QWebPluginFactory的功能，因为渲染不是由Qt而是由铬进行的。

pyqtpyqt5pythonpython-3.xqwebview