问题
I want to create a simple PDF Viewer inside my Qt Application. Everything works fine, accept opening the PDF at a specific page over the URL. For example:
url = "file:///D://Repo//PdfViewer//PdfViewer//test.pdf";
Works, but
url = "file:///D://Repo//PdfViewer//PdfViewer//test.pdf#page=9";
dosent. I read somewhere, that chrome dosent offically support #page=x anymore, but I cant find futher information how to solve this. I face the same problem with this url in the Nano-Browser Example from Qt.
PdfViewer::PdfViewer(const QString &pdf_path, QWidget *parent)
: QWidget(parent), m_View(new QWebEngineView(this)), m_ExitButton(new QPushButton())
{
QUrl url = QUrl::fromLocalFile(pdf_path);
m_View->settings()->setAttribute(QWebEngineSettings::PluginsEnabled, true);
m_View->settings()->setAttribute(QWebEngineSettings::FullScreenSupportEnabled, true);
m_View->settings()->setAttribute(QWebEngineSettings::PdfViewerEnabled, true);
m_View->load(url);
m_ExitButton->setIcon(QIcon("Ok.png"));
QVBoxLayout *layout = new QVBoxLayout();
layout->addWidget(m_View);
layout->addWidget(m_ExitButton);
this->setLayout(layout);
connect(m_ExitButton, &QPushButton::clicked, this, &PdfViewer::close);
}
I am using Qt 5.13.
回答1:
Qt WebEngine uses the chromium pdf viewer so analyzing the source code I found the function that implements move of page: window.viewer.viewport_.goToPage(page)
that can be executed using the runJavaScript()
method of QWebEnginePage.
Considering the above, the solution is:
#include <QtWebEngineWidgets>
class PdfViewer: public QWidget{
Q_OBJECT
public:
PdfViewer(const QString &pdf_path, QWidget *parent=nullptr)
: QWidget(parent), m_View(new QWebEngineView(this)), m_ExitButton(new QPushButton())
{
QUrl url = QUrl::fromLocalFile(pdf_path);
m_View->settings()->setAttribute(QWebEngineSettings::PluginsEnabled, true);
m_View->settings()->setAttribute(QWebEngineSettings::FullScreenSupportEnabled, true);
m_View->settings()->setAttribute(QWebEngineSettings::PdfViewerEnabled, true);
m_View->load(url);
m_ExitButton->setIcon(QIcon("Ok.png"));
QVBoxLayout *layout = new QVBoxLayout();
layout->addWidget(m_View);
layout->addWidget(m_ExitButton);
this->setLayout(layout);
connect(m_ExitButton, &QPushButton::clicked, this, &PdfViewer::close);
connect(m_View, &QWebEngineView::loadFinished, this, &PdfViewer::on_finished);
}
private Q_SLOTS:
void on_finished(bool ok){
if(ok){
QTimer::singleShot(100, this, [this](){ goToPage(9); });
}
}
private:
void goToPage(int page){
m_View->page()->runJavaScript(QString("window.viewer.viewport_.goToPage(%1)").arg(page));
}
QWebEngineView *m_View;
QPushButton *m_ExitButton;
};
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
QString fileName = QFileDialog::getOpenFileName(nullptr,
QObject::tr("Open Image"),
QDir::homePath(),
QObject::tr("PDF Files (*.pdf)"));
if(fileName.isEmpty())
return 0;
PdfViewer w(fileName);
w.resize(640, 480);
w.show();
return a.exec();
}
#include "main.moc"
来源:https://stackoverflow.com/questions/60560583/open-pdf-at-specific-page-with-qt-webengineview