QWebEngineView用pdf路徑更新

Question

我有一個QtWebEngineWidgets顯示一些pdf文件。 我想更改pdf並自動動態地強制QtWebEngineView顯示。 我得到的問題是QtWebEngineWidgets不更新，當pdf文件路徑更改時無法顯示。

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)

外功能：

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

嘗試測試功能並按預期返回：

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：

運行時會出現以下錯誤：

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_())

顯示：

Answer 1

假設程序的其他部分正常工作，則問題在於您僅更新變量，而沒有加載新的url，因此解決方案是：

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))
        )

您遇到的問題是您創建的路徑不正確，因為您必須使用絕對路徑，而不是像您本例那樣使用相對路徑。 考慮到上述解決方案是：

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