Implement printing.

[PrivacyBrowserPC.git] / src / views / BrowserView.cpp

diff --git a/src/views/BrowserView.cpp b/src/views/BrowserView.cpp
index e7f238fc9beacb174d292a77d6c6e5fb58d6ebe3..b3f593ff93352a1d023a895207cb5832af21e036 100644 (file)
--- a/src/views/BrowserView.cpp
+++ b/src/views/BrowserView.cpp
@@ -31,6 +31,9 @@
 
 // Qt framework headers.
 #include <QAction>
+#include <QPrintDialog>
+#include <QPrintPreviewDialog>
+#include <QPrinter>
 
 // Initialize the public static variables.
 QString BrowserView::webEngineDefaultUserAgent = QStringLiteral("");
@@ -577,6 +580,60 @@ void BrowserView::pageLinkHovered(const QString &linkUrl) const
     emit linkHovered(linkUrl);
 }
 
+void BrowserView::print() const
+{
+    // Create a printer.
+    QPrinter printer;
+
+    // Set the resolution to be 300 dpi.
+    printer.setResolution(300);
+
+    // Create a printer dialog.
+    QPrintDialog printDialog(&printer, webEngineViewPointer);
+
+    // Display the dialog and print the page if instructed.
+    if (printDialog.exec() == QDialog::Accepted)
+        printWebpage(&printer);
+}
+
+void BrowserView::printPreview() const
+{
+    // Create a printer.
+    QPrinter printer;
+
+    // Set the resolution to be 300 dpi.
+    printer.setResolution(300);
+
+    // Create a print preview dialog.
+    QPrintPreviewDialog printPreviewDialog(&printer, webEngineViewPointer);
+
+    // Generate the print preview.
+    connect(&printPreviewDialog, SIGNAL(paintRequested(QPrinter *)), this, SLOT(printWebpage(QPrinter *)));
+
+    // Display the dialog.
+    printPreviewDialog.exec();
+}
+
+void BrowserView::printWebpage(QPrinter *printerPointer) const
+{
+    // Create an event loop.  For some reason, the print preview doesn't produce any output unless it is run inside an event loop.
+    QEventLoop eventLoop;
+
+    // Print the webpage, converting the callback above into a `QWebEngineCallback<bool>`.
+    // Printing requires that the printer be a pointer, not a reference, or it will crash with much cursing.
+    webEnginePagePointer->print(printerPointer, [&eventLoop](bool printSuccess)
+    {
+        // Instruct the compiler to ignore the unused parameter.
+        (void) printSuccess;
+
+        // Quit the loop.
+        eventLoop.quit();
+    });
+
+    // Execute the loop.
+    eventLoop.exec();
+}
+
 void BrowserView::refresh() const
 {
     // Reload the website.