如何在 PyQt5 中创建 QWebEngineView 的打印预览？

Question

我正在尝试创建 QWebEngineView 的打印预览，但无法正常工作。

这是我的代码：

...
self.view = QWebEngineView()
...

def handle_preview(self):
    dialog = QPrintPreviewDialog()
    dialog.paintRequested.connect(self.view.print_)
    dialog.exec_()

代码给我这个错误：

AttributeError: 'QWebEngineView' 对象没有属性 'print_'

当我使用 QTextEdit 时，代码运行完美。但这不是我想要的。我想用QWebEngineView。

Answer 1

基于官方示例：WebEngine Widgets PrintMe Example您可以使用以下代码实现预览

from PyQt5.QtCore import (QCoreApplication, QEventLoop, QObject, QPointF, Qt,
                       QUrl, pyqtSlot)
from PyQt5.QtGui import QKeySequence, QPainter
from PyQt5.QtPrintSupport import QPrintDialog, QPrinter, QPrintPreviewDialog
from PyQt5.QtWebEngineWidgets import QWebEnginePage, QWebEngineView
from PyQt5.QtWidgets import QApplication, QDialog, QLabel, QProgressBar, QProgressDialog, QShortcut


class PrintHandler(QObject):
    def __init__(self, parent = None):
        super().__init__(parent)
        self.m_page = None
        self.m_inPrintPreview = False

    def setPage(self, page):
        assert not self.m_page
        self.m_page = page
        self.m_page.printRequested.connect(self.printPreview)

    @pyqtSlot()
    def print(self):
        printer = QPrinter(QPrinter.HighResolution)
        dialog = QPrintDialog(printer, self.m_page.view())
        if dialog.exec_() != QDialog.Accepted:
            return
        self.printDocument(printer)

    @pyqtSlot()
    def printPreview(self):
        if not self.m_page:
            return
        if self.m_inPrintPreview:
            return
        self.m_inPrintPreview = True
        printer = QPrinter()
        preview = QPrintPreviewDialog(printer, self.m_page.view())
        preview.paintRequested.connect(self.printDocument)
        preview.exec()
        self.m_inPrintPreview = False

    @pyqtSlot(QPrinter)
    def printDocument(self, printer):
        loop = QEventLoop()
        result = False

        def printPreview(success):
            nonlocal result
            result = success
            loop.quit()
        progressbar = QProgressDialog(self.m_page.view())
        progressbar.findChild(QProgressBar).setTextVisible(False)
        progressbar.setLabelText("Wait please...")
        progressbar.setRange(0, 0)
        progressbar.show()
        progressbar.canceled.connect(loop.quit)
        self.m_page.print(printer, printPreview)
        loop.exec_()
        progressbar.close()
        if not result:
            painter = QPainter()
            if painter.begin(printer):
                font = painter.font()
                font.setPixelSize(20)
                painter.setFont(font)
                painter.drawText(QPointF(10, 25), "Could not generate print preview.")
                painter.end()


def main():
    import sys

    QCoreApplication.setAttribute(Qt.AA_EnableHighDpiScaling)
    app = QApplication(sys.argv)
    app.setApplicationName("Previewer")

    view = QWebEngineView()
    view.setUrl(QUrl("
    view.resize(1024, 750)
    view.show()

    handler = PrintHandler()
    handler.setPage(view.page())

    printPreviewShortCut = QShortcut(QKeySequence(Qt.CTRL + Qt.Key_P), view)
    printShortCut = QShortcut(QKeySequence(Qt.CTRL + Qt.SHIFT + Qt.Key_P), view)

    printPreviewShortCut.activated.connect(handler.printPreview)
    printShortCut.activated.connect(handler.print)

    sys.exit(app.exec_())


if __name__ == "__main__":
    main()

注意：对于PySide2你只需要将pyqtSlot改为Slot。

如何在 PyQt5 中创建 QWebEngineView 的打印预览？

How do I create a print preview of QWebEngineView in PyQt5?

python

pyqt

pyqt5

print-preview

qwebengineview