Allow access to ppd file and ppdMarkOption via QPpdPrintDevice::property/setProperty

Change-Id: I47b49b52121950fa8e3ea7a056974d9f3033490f
Reviewed-by: Liang Qi <liang.qi@qt.io>

src/plugins/printsupport/cups/qppdprintdevice.cpp

@@ -42,6 +42,8 @@
 #include <QtCore/QMimeDatabase>
 #include <qdebug.h>
 
+#include "private/qcups_p.h" // Only needed for PDPK_*
+
 #ifndef QT_LINUXBASE // LSB merges everything into cups.h
 #include <cups/language.h>
 #endif
@@ -421,6 +423,25 @@ QPrint::ColorMode QPpdPrintDevice::defaultColorMode() const
     return QPrint::GrayScale;
 }
 
+QVariant QPpdPrintDevice::property(QPrintDevice::PrintDevicePropertyKey key) const
+{
+    if (key == PDPK_PpdFile)
+        return QVariant::fromValue<ppd_file_t *>(m_ppd);
+
+    return QVariant();
+}
+
+bool QPpdPrintDevice::setProperty(QPrintDevice::PrintDevicePropertyKey key, const QVariant &value)
+{
+    if (key == PDPK_PpdOption) {
+        const QStringList values = value.toStringList();
+        if (values.count() == 2)
+            return ppdMarkOption(m_ppd, values[0].toLatin1(), values[1].toLatin1()) == 0;
+    }
+
+    return false;
+}
+
 #ifndef QT_NO_MIMETYPE
 void QPpdPrintDevice::loadMimeTypes() const
 {

src/plugins/printsupport/cups/qppdprintdevice.h

@@ -89,6 +89,9 @@ public:
 
     QPrint::ColorMode defaultColorMode() const override;
 
+    QVariant property(QPrintDevice::PrintDevicePropertyKey key) const override;
+    bool setProperty(QPrintDevice::PrintDevicePropertyKey key, const QVariant &value) override;
+
 protected:
     void loadPageSizes() const override;
     void loadResolutions() const override;

src/printsupport/kernel/qcups_p.h

@@ -67,6 +67,9 @@ QT_BEGIN_NAMESPACE
 // removed from the dialogs.
 #define PPK_CupsOptions QPrintEngine::PrintEnginePropertyKey(0xfe00)
 
+#define PDPK_PpdFile   QPrintDevice::PrintDevicePropertyKey(QPrintDevice::PDPK_CustomBase)
+#define PDPK_PpdOption QPrintDevice::PrintDevicePropertyKey(QPrintDevice::PDPK_CustomBase + 1)
+
 class Q_PRINTSUPPORT_EXPORT QCUPSSupport
 {
 public:

src/printsupport/kernel/qprint_p.h

@@ -59,6 +59,7 @@
 
 #if (defined Q_OS_MACOS) || (defined Q_OS_UNIX && QT_CONFIG(cups))
 #include <cups/ppd.h>  // Use for type defs only, don't want to actually link in main module
+Q_DECLARE_METATYPE(ppd_file_t *)
 #endif
 
 QT_BEGIN_NAMESPACE