How to Render local PDFs with QWebEngine6?

wad11656

Re: [QWebEngineView Crbug/1173575](non-JS module files deprecated when trying to load a PDF file)

How do you render local PDFs with QWebEngine? I have a feeling I'll get a much nicer rendering than rasterizing as an image then displaying via PyMuPDF/fitz (which right now is terribly ugly/does not show fine lines correctly despite messing with dpi settings).

I'm getting the exact same js: crbug/1173575, non-JS module files deprecated. errors that OP did in the post above, including the occasional crash/long freezes.

This is the key part of the code I'm using to try to render the PDF (full code at bottom):

directory = os.path.join(current_script_path, "PDF Templates")
self.pdfFiles = [f for f in os.listdir(directory) if f.endswith('.pdf')]
...
pdf_path = os.path.join("PDF Templates", self.pdfFiles[index])
full_path = QUrl.fromLocalFile(os.path.abspath(pdf_path))
self.viewer.setUrl(full_path)

import sys
import os
from PyQt6.QtCore import Qt, QUrl
from PyQt6.QtGui import QPixmap
from PyQt6.QtWidgets import QMainWindow, QApplication, QMainWindow, QLabel, QComboBox, QVBoxLayout, QWidget, QGraphicsView, QGraphicsScene
from PyQt6.QtWebEngineWidgets import QWebEngineView
from PyQt6.QtWebEngineCore import QWebEngineSettings
import fitz

class MainWindow(QMainWindow):
    def __init__(self):
        super().__init__()
        self.setWindowTitle("PDF Viewer and Editor")
        self.setGeometry(100, 100, 800, 600)

        # Set up the layout
        layout = QVBoxLayout()
        centralWidget = QWidget(self)
        self.setCentralWidget(centralWidget)
        centralWidget.setLayout(layout)

        # Combo box for selecting a PDF
        self.comboBox = QComboBox(self)
        self.loadPDFs()
        layout.addWidget(self.comboBox)

        # Setup QWebEngineView for displaying PDFs
        self.viewer = QWebEngineView(self)
        layout.addWidget(self.viewer)

        # Connect the combo box to change the display
        self.comboBox.currentIndexChanged.connect(self.updatePDFDisplay)

    def loadPDFs(self):
        current_script_path = os.path.dirname(os.path.abspath(__file__))
        directory = os.path.join(current_script_path, "PDF Templates")
        self.pdfFiles = [f for f in os.listdir(directory) if f.endswith('.pdf')]
        self.comboBox.addItems(self.pdfFiles)

    def updatePDFDisplay(self, index):
        if index == -1:
            return
        
        pdf_path = os.path.join("PDF Templates", self.pdfFiles[index])
        full_path = QUrl.fromLocalFile(os.path.abspath(pdf_path))
        
        print("Attempting to render PDF at path:", full_path.toString())

        self.viewer.setUrl(full_path)

if __name__ == "__main__":
    app = QApplication(sys.argv)
    mainWindow = MainWindow()
    mainWindow.show()
    sys.exit(app.exec())