問題描述

我有一個顯示一些 pdf 文件的 QtWebEngineWidgets.我想更改 pdf 并強制 QtWebEngineView 自動動態顯示.我得到的問題是 QtWebEngineWidgets 沒有更新，無法在 pdf 文件路徑更改時顯示.

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)

外層函數:

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

嘗試測試功能并按預期返回:

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'>

存在pdf文件'file0'、'file1'和'file2':

運行時出現此錯誤:

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:

推薦答案

假設你程序的其他部分工作正常，問題是你只是更新了一個變量而沒有加載新的url，所以解決方法是:

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，而不是像您的情況那樣使用相對路徑.考慮到上述解決方案是:

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

這篇關于使用 pdf 路徑更新 QWebEngineView的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網！