QWebEngineView 使用 pdf 路径更新 [英] QWebEngineView update with pdf path

问题描述

我有一个 QtWebEngineWidgets 显示一些 pdf 文件.我想更改 pdf 并自动动态地强制 QtWebEngineView 显示.我得到的问题是 QtWebEngineWidgets 没有更新，当 pdf 文件路径改变时无法显示.

I have a QtWebEngineWidgets showing some pdf files. I want to change pdf and force QtWebEngineView display automatically and dynamically. The problem I get is the QtWebEngineWidgets does not update, incapabile to display when pdf file path changes.

class PdfReport(QtWebEngineWidgets.QWebEngineView):
    PDFJS = 'file:///pdfjs/web/viewer.html'
    def __init__(self, parent=None):
        super(PdfReport, self).__init__(parent)
        self.PDF = 'file:///Technicalreport/file0.pdf'
        self.load(QtCore.QUrl.fromUserInput('%s?file=%s' % (PDFJS, self.PDF))) 

    @QtCore.pyqtSlot(int)    
    def index_load(self, _index):
        self._index = _index
        self.PDF = pdfpath(self._index)

外部功能:

def pdfpath(index):
    if index == -1:
        PDF = 'file:///Technicalreport/file0.pdf'
    else:
        PDF = 'file:///Technicalreport/file%d.pdf' %index
    return PDF

尝试测试函数并按预期返回:

tried to test function and returns as expected:

for i in range(3):
    print(pdfpath(i), type(pdfpath(i)))

file:///Technicalreport/file0.pdf <class 'str'>
file:///Technicalreport/file1.pdf <class 'str'>
file:///Technicalreport/file2.pdf <class 'str'>

是 pdf 文件 'file0'、'file1' 和 'file2' 存在:

Yes pdf files 'file0', 'file1' and 'file2' exist:

运行时出现此错误:

TypeError: 'module' object is not callable

更新:

import sys
from PyQt5 import QtCore, QtWidgets, QtWebEngineWidgets

PDFJS = 'file:///pdfjs/web/viewer.html'
PDF = 'file:///Technicalreport/file0.pdf'

def pdfpath(index):
    if index == -1:
        PDF = 'file:///Technicalreport/file0.pdf'
    else:
        PDF = 'file:///Technicalreport/file%d.pdf' %index
    return PDF


class Foo(QtWidgets.QWidget):
    def __init__(self, parent=None):
        super(Foo, self).__init__(parent)
        self.setGeometry(QtCore.QRect(200, 100, 800, 800))

        self.pdf = Window()
        self.com = Widget()
        self.lay = QtWidgets.QVBoxLayout(self)
        self.lay.addWidget(self.pdf)
        self.lay.addWidget(self.com)

        self.com.IndexChanged.connect(self.pdf.index_load)


class Window(QtWebEngineWidgets.QWebEngineView):

    def __init__(self, parent=None):
        super(Window, self).__init__(parent)
        self.PDF = PDF
        self.load(QtCore.QUrl.fromUserInput('%s?file=%s' % (PDFJS, self.PDF)))            

    @QtCore.pyqtSlot(int)    
    def index_load(self, _index):
        self._index = _index
        self.PDF = pdfpath(self._index)
        print(self.PDF,'=', self._index)



class Widget(QtWidgets.QWidget):
    IndexChanged = QtCore.pyqtSignal(int)
    def __init__(self, parent=None):
        QtWidgets.QWidget.__init__(self, parent)
        self.setLayout(QtWidgets.QVBoxLayout())
        self.combo = QtWidgets.QComboBox(self)
        self.layout().addWidget(self.combo)
        self.combo.addItems(["item1", "item2", "item3"])
        self.combo.setMinimumWidth(150)
        self.combo.activated[int].connect(self.onActivatedIndex)

    @QtCore.pyqtSlot(int)
    def onActivatedIndex(self, index):
        self.IndexChanged.emit(index)


if __name__ == '__main__':

    app = QtWidgets.QApplication(sys.argv)
    window = Foo()
    window.setGeometry(600, 50, 800, 600)
    window.show()
    sys.exit(app.exec_())

显示:

推荐答案

假设你的程序的其他部分工作正常，问题是你只是更新了一个变量而没有加载新的url，所以解决方案是:

Assuming that the other parts of your program work correctly, the problem is that you are only updating a variable but you are not loading the new url, so the solution is:

class PdfReport(QtWebEngineWidgets.QWebEngineView):
    PDFJS = "file:///pdfjs/web/viewer.html"

    def __init__(self, parent=None):
        super(PdfReport, self).__init__(parent)
        self.load_pdf("file:///Technicalreport/file0.pdf")

    def load_pdf(self, pdf):
        self.load(
            QtCore.QUrl.fromUserInput("%s?file=%s" % (PdfReport.PDFJS, pdf))
        )

您的情况的问题是您创建的路径不正确，因为您必须使用绝对路径而不是您的情况下的相对路径.考虑到上述解决方案是:

The problem in your case is that you are creating the path incorrectly because you must use an absolute path and not relative as in your case. Considering the above the solution is:

import os
import sys
from PyQt5 import QtCore, QtWidgets, QtWebEngineWidgets

CURRENT_DIR = os.path.dirname(os.path.realpath(__file__))

PDFJS = QtCore.QUrl.fromLocalFile(
    os.path.join(CURRENT_DIR, "pdfjs/web/viewer.html")
).toString()


def pdfpath(index):
    filename = ""
    if index == -1:
        filename = "Technicalreport/file0.pdf"
    else:
        filename = "Technicalreport/file%d.pdf" % index
    return os.path.join(CURRENT_DIR, filename)


class PdfReport(QtWebEngineWidgets.QWebEngineView):
    def load_pdf(self, filename):
        url = QtCore.QUrl.fromLocalFile(filename).toString()
        self.load(QtCore.QUrl.fromUserInput("%s?file=%s" % (PDFJS, url)))

    def sizeHint(self):
        return QtCore.QSize(640, 480)

    @QtCore.pyqtSlot(int)
    def index_load(self, index):
        path = pdfpath(index)
        self.load_pdf(path)


class Widget(QtWidgets.QWidget):
    indexChanged = QtCore.pyqtSignal(int)

    def __init__(self, parent=None):
        super(Widget, self).__init__(parent)
        self.combo = QtWidgets.QComboBox()
        self.combo.addItems(["item1", "item2", "item3"])
        self.combo.setMinimumWidth(150)
        self.combo.activated[int].connect(self.indexChanged)

        lay = QtWidgets.QVBoxLayout(self)
        lay.addWidget(self.combo)

        self.setSizePolicy(
            QtWidgets.QSizePolicy.Preferred, QtWidgets.QSizePolicy.Maximum
        )


class Foo(QtWidgets.QWidget):
    def __init__(self, parent=None):
        super(Foo, self).__init__(parent)

        self.pdf = PdfReport()
        self.com = Widget()

        self.com.indexChanged.connect(self.pdf.index_load)
        self.pdf.index_load(-1)

        lay = QtWidgets.QVBoxLayout(self)
        lay.addWidget(self.pdf)
        lay.addWidget(self.com)


if __name__ == "__main__":

    app = QtWidgets.QApplication(sys.argv)
    w = Foo()
    w.show()
    sys.exit(app.exec_())

├── main.py
├── pdfjs
│   ├── build
│   │   └── ...
│   ├── LICENSE
│   └── web
│       ├── ...
│       ├── viewer.html
│       └── ...
└── Technicalreport
    ├── file0.pdf
    ├── file1.pdf
    └── file2.pdf

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