Add support for dynamically loading print plugins

Scraped out CUPS & CPDB specific code from print dialog frontend,
and put it in their respective print plugin directories.

This allows the print dialog to be able to dynamically select
print backends at runtime instead of having to choose one at build time.

Change-Id: I8ae53d19d91aa9689ec327fd8077558744e4768b

Author: TinyTrebuchet

src/printsupport/dialogs/qprintdialog_unix.cpp

@@ -133,6 +133,9 @@ private Q_SLOTS:
     bool anyAdvancedOptionConflict() const;
 
 
+    Ui::QPrintPropertiesWidget widget;
+    QDialogButtonBox *m_buttons;
+
     Ui::QPrintPropertiesWidget widget;
     QDialogButtonBox *m_buttons;
     QPrintDevice *m_currentPrintDevice;
@@ -324,6 +327,24 @@ QPrintPropertiesDialog::QPrintPropertiesDialog(QPrinter *printer, QPrintDevice *
         widget.tabs->setTabEnabled(advancedTabIndex, false);
     }
 
+    if (currentPrintDevice->isFeatureAvailable(QPrintDevice::PDPK_JobHold, QVariant())
+            || currentPrintDevice->isFeatureAvailable(QPrintDevice::PDPK_JobBillingInfo, QVariant())
+            || currentPrintDevice->isFeatureAvailable(QPrintDevice::PDPK_JobPriority, QVariant())
+            || currentPrintDevice->isFeatureAvailable(QPrintDevice::PDPK_JobStartCoverPage, QVariant())
+            || currentPrintDevice->isFeatureAvailable(QPrintDevice::PDPK_JobEndCoverPage, QVariant()))
+    {
+        m_jobOptions = new QPrintJobWidget(printer, currentPrintDevice, this);
+        widget.tabs->insertTab(1, m_jobOptions, tr("Job Options"));
+    }
+
+    const int advancedTabIndex = widget.tabs->indexOf(widget.cupsPropertiesPage);
+    if (currentPrintDevice->isFeatureAvailable(QPrintDevice::PDPK_AdvancedOptions, QVariant())) {
+        widget.tabs->setTabEnabled(advancedTabIndex, true);
+        widget.scrollArea->setWidget(createAdvancedOptionsWidget(currentPrintDevice));
+    } else {
+        widget.tabs->setTabEnabled(advancedTabIndex, false);
+    }
+
     widget.conflictsLabel->setVisible(anyAdvancedOptionConflict());
 }
 
@@ -341,6 +362,9 @@ void QPrintPropertiesDialog::setupPrinter() const
     if (m_jobOptions)
     m_currentPrintDevice->setProperty(QPrintDevice::PDPK_AdvancedOptions, QVariant(QByteArray("#clear#")));
 
+    widget.pageSetup->setupPrinter();
+    m_currentPrintDevice->setProperty(QPrintDevice::PDPK_AdvancedOptions, QVariant(QByteArray("#clear#")));
+
     widget.pageSetup->setupPrinter();
 
     if (m_jobOptions) {
@@ -533,6 +557,10 @@ static const char *ppdOptionProperty = "_q_ppd_option";
     QDialog::showEvent(event);
 }
 
+    widget.conflictsLabel->setVisible(anyAdvancedOptionConflict());
+    QDialog::showEvent(event);
+}
+
 // Used to store the option name for each QComboBox that represents an advanced option
 static const char *optionNameProperty = "_q_print_option_name";
 
@@ -651,6 +679,9 @@ bool QPrintPropertiesDialog::createAdvancedOptionsWidget()
 
         if (qstrcmp(option->defchoice, selectedChoice) != 0)
 void QPrintPropertiesDialog::setPrinterAdvancedOptions() const
+{
+    for (const QComboBox *choicesCb : m_advancedOptionsCombos) {
+void QPrintPropertiesDialog::setPrinterAdvancedOptions() const
 {
     for (const QComboBox *choicesCb : m_advancedOptionsCombos) {
         QByteArray optionName = qvariant_cast<QByteArray>(choicesCb->property(optionNameProperty));
@@ -809,6 +840,7 @@ void QPrintDialogPrivate::selectPrinter(const QPrinter::OutputFormat outputForma
     options.duplexShort->setEnabled(supportedDuplexMode.contains(QPrint::DuplexShortSide));
 
     // support feature PDPK_AdvancedColorMode if you want to display Color option separately
+    // among other advanced options in QPrintProperties dialog (eg. CUPS)
     if (top->d->m_currentPrintDevice.isFeatureAvailable(QPrintDevice::PDPK_AdvancedColorMode, QVariant())) {
         options.colorMode->setEnabled(false);
     } else {
@@ -891,6 +923,10 @@ void QPrintDialogPrivate::updatePpdDuplexOption(QRadioButton *radio)
             && top->d->m_currentPrintDevice.isFeatureAvailable(QPrintDevice::PDPK_PageRange, QVariant()));
 }
 
+    options.pagesRadioButton->setEnabled(outputFormat != QPrinter::PdfFormat
+            && top->d->m_currentPrintDevice.isFeatureAvailable(QPrintDevice::PDPK_PageRange, QVariant()));
+}
+
 void QPrintDialogPrivate::setExplicitDuplexMode(QRadioButton *radio)
 {
     const bool checked = radio->isChecked();
@@ -1020,6 +1056,25 @@ void QPrintDialogPrivate::setupPrinter()
                                                  options.pageSetCombo->itemData(options.pageSetCombo->currentIndex()));
     }
 
+    if (options.pagesRadioButton->isEnabled() && options.pagesRadioButton->isChecked()) {
+        QString pageRange = options.pagesLineEdit->text();
+        const QPageRanges ranges = QPageRanges::fromString(pageRange);
+        if (!ranges.isEmpty()) {
+            p->setPrintRange(QPrinter::PageRange);
+            p->setPageRanges(ranges);
+        }
+        top->d->m_currentPrintDevice.setProperty(QPrintDevice::PDPK_PageRange, pageRange);
+    }
+    if (!q->testOption(QPrintDialog::PrintPageRange) && options.printRange->isChecked()) {
+        QString pageRange = tr("%1-%2").arg(options.from->value()).arg(qMax(options.from->value(),options.to->value()));
+        top->d->m_currentPrintDevice.setProperty(QPrintDevice::PDPK_PageRange, pageRange);
+    }
+
+    if (options.pageSetCombo->isEnabled()) {
+        top->d->m_currentPrintDevice.setProperty(QPrintDevice::PDPK_PageSet,
+                                                 options.pageSetCombo->itemData(options.pageSetCombo->currentIndex()));
+    }
+
     if (options.colorMode->isEnabled()) {
         p->setColorMode(options.color->isChecked() ? QPrinter::Color : QPrinter::GrayScale);
     }