如何使用pyqt5浏览器实现打印功能

Question

[当我使用pyqt5浏览器访问特定网页时，该页面中有一个打印按钮，但是当我单击此打印按钮时，浏览器没有响应。在Firefox浏览器中，我单击打印按钮后，将显示打印预览，并且我可以选择打印机。

Answer 1

根据this，QtWebEngine尚不能使用打印预览，因此只能直接打印。

要捕获页面的打印请求，您需要连接printRequested()信号。

printRequested()

Answer 2

class PrintTest(QtWidgets.QWidget):
    def __init__(self, parent=None):
        super(PrintTest, self).__init__(parent)
        layout = QtWidgets.QHBoxLayout(self)
        self.view = QtWebEngineWidgets.QWebEngineView()
        layout.addWidget(self.view)
        self.page = QtWebEngineWidgets.QWebEnginePage(self)
        self.view.setPage(self.page)
        self.page.printRequested.connect(self.printRequested)
        # load a page that has a print request
        self.view.load(QtCore.QUrl(
            "https://www.w3schools.com/jsref/tryit.asp?filename=tryjsref_print"))

    def printRequested(self):
        defaultPrinter = QtPrintSupport.QPrinter(
            QtPrintSupport.QPrinterInfo.defaultPrinter())
        dialog = QtPrintSupport.QPrintDialog(defaultPrinter, self)
        if dialog.exec():
            # printer object has to be persistent
            self._printer = dialog.printer()
            self.page.print(self._printer, self.printResult)

    def printResult(self, success):
        if success:
            QtWidgets.QMessageBox.information(self, 'Print completed', 
                'Printing has been completed!', QtWidgets.QMessageBox.Ok)
        else:
            QtWidgets.QMessageBox.warning(self, 'Print failed', 
                'Printing has failed!', QtWebEngineWidgets.QMessageBox.Ok)
            self.printRequested()
        del self._printer