Add debug operator for QPrinterInfo.

Add formatting helper to private class QPrintDevice and
use that to implement debug operators for QPrintDevice and QPrinterInfo.

Sample output:
(QPrinterInfo(id="HP_Color_LaserJet_CM6030_MFP", state=0, name="HP Color LaserJet CM6030 MFP", makeAndModel="HP Color LaserJet CM6030 MFP Postscript (recommended)", default, defaultPageSize=QPageSize("Letter", "Letter", 612x792pt, 2), supportsCustomPageSizes, physicalPageSize=(278, 396)..(907, 1296), defaultResolution=600, defaultDuplexMode=0, defaultColorMode=1, supportedMimeTypes=( "application/pdf" "application/postscript" "image/gif" "image/png" "image/jpeg" "image/tiff" "text/html" "text/plain")))

Task-number: QTBUG-44991
Change-Id: I187414d2f68871e38ace0bd66661d2e37712f662
Reviewed-by: Andy Shaw <andy.shaw@digia.com>

src/printsupport/kernel/qprintdevice.cpp

@@ -34,6 +34,8 @@
 #include "qprintdevice_p.h"
 #include "qplatformprintdevice.h"
 
+#include <private/qdebug_p.h>
+
 QT_BEGIN_NAMESPACE
 
 #ifndef QT_NO_PRINTER
@@ -244,6 +246,59 @@ QList<QMimeType> QPrintDevice::supportedMimeTypes() const
 }
 #endif // QT_NO_MIMETYPE
 
+#  ifndef QT_NO_DEBUG_STREAM
+void QPrintDevice::format(QDebug debug) const
+{
+    QDebugStateSaver saver(debug);
+    debug.noquote();
+    debug.nospace();
+    if (isValid()) {
+        const QString deviceId = id();
+        const QString deviceName = name();
+        debug << "id=\"" << deviceId << "\", state=" << state();
+        if (!deviceName.isEmpty() && deviceName != deviceId)
+            debug << ", name=\"" << deviceName << '"';
+        if (!location().isEmpty())
+            debug << ", location=\"" << location() << '"';
+        debug << ", makeAndModel=\"" << makeAndModel() << '"';
+        if (isDefault())
+            debug << ", default";
+        if (isRemote())
+            debug << ", remote";
+        debug << ", defaultPageSize=" << defaultPageSize();
+        if (supportsCustomPageSizes())
+            debug << ", supportsCustomPageSizes";
+        debug << ", physicalPageSize=(";
+        QtDebugUtils::formatQSize(debug, minimumPhysicalPageSize());
+        debug << ")..(";
+        QtDebugUtils::formatQSize(debug, maximumPhysicalPageSize());
+        debug << "), defaultResolution=" << defaultResolution()
+              << ", defaultDuplexMode=" << defaultDuplexMode()
+              << ", defaultColorMode="<< defaultColorMode();
+#    ifndef QT_NO_MIMETYPE
+        const QList<QMimeType> mimeTypes = supportedMimeTypes();
+        if (const int mimeTypeCount = mimeTypes.size()) {
+            debug << ", supportedMimeTypes=(";
+            for (int i = 0; i < mimeTypeCount; ++i)
+                debug << " \"" << mimeTypes.at(i).name() << '"';
+            debug << ')';
+        }
+#    endif // !QT_NO_MIMETYPE
+    } else {
+        debug << "null";
+    }
+}
+
+QDebug operator<<(QDebug debug, const QPrintDevice &p)
+{
+    QDebugStateSaver saver(debug);
+    debug.nospace();
+    debug << "QPrintDevice(";
+    p.format(debug);
+    debug << ')';
+    return debug;
+}
+#  endif // QT_NO_DEBUG_STREAM
 #endif // QT_NO_PRINTER
 
 QT_END_NAMESPACE

src/printsupport/kernel/qprintdevice_p.h

@@ -57,6 +57,7 @@ QT_BEGIN_NAMESPACE
 class QPlatformPrintDevice;
 class QMarginsF;
 class QMimeType;
+class QDebug;
 
 class Q_PRINTSUPPORT_EXPORT QPrintDevice
 {
@@ -127,6 +128,10 @@ public:
     QList<QMimeType> supportedMimeTypes() const;
 #endif
 
+#  ifndef QT_NO_DEBUG_STREAM
+    void format(QDebug debug) const;
+#  endif
+
 private:
     friend class QPlatformPrinterSupport;
     friend class QPlatformPrintDevice;
@@ -136,6 +141,9 @@ private:
 
 Q_DECLARE_SHARED(QPrintDevice)
 
+#  ifndef QT_NO_DEBUG_STREAM
+Q_PRINTSUPPORT_EXPORT QDebug operator<<(QDebug debug, const QPrintDevice &);
+#  endif
 #endif // QT_NO_PRINTER
 
 QT_END_NAMESPACE

src/printsupport/kernel/qprinterinfo.cpp

@@ -31,6 +31,8 @@
 
 #ifndef QT_NO_PRINTER
 
+#include <QtCore/qdebug.h>
+
 #include <qpa/qplatformprintplugin.h>
 #include <qpa/qplatformprintersupport.h>
 
@@ -469,6 +471,21 @@ QPrinterInfo QPrinterInfo::printerInfo(const QString &printerName)
     return QPrinterInfo(printerName);
 }
 
+#  ifndef QT_NO_DEBUG_STREAM
+QDebug operator<<(QDebug debug, const QPrinterInfo &p)
+{
+    QDebugStateSaver saver(debug);
+    debug.nospace();
+    debug << "QPrinterInfo(";
+    if (p.isNull())
+        debug << "null";
+    else
+        p.d_ptr->m_printDevice.format(debug);
+    debug << ')';
+    return debug;
+}
+#  endif // !QT_NO_DEBUG_STREAM
+
 QT_END_NAMESPACE
 
 #endif // QT_NO_PRINTER

src/printsupport/kernel/qprinterinfo.h

@@ -46,6 +46,7 @@ QT_BEGIN_NAMESPACE
 #ifndef QT_NO_PRINTER
 class QPrinterInfoPrivate;
 class QPrinterInfoPrivateDeleter;
+class QDebug;
 class Q_PRINTSUPPORT_EXPORT QPrinterInfo
 {
 public:
@@ -98,6 +99,9 @@ private:
 
 private:
     friend class QPlatformPrinterSupport;
+#  ifndef QT_NO_DEBUG_STREAM
+    friend Q_PRINTSUPPORT_EXPORT QDebug operator<<(QDebug debug, const QPrinterInfo &);
+#  endif
     Q_DECLARE_PRIVATE(QPrinterInfo)
     QScopedPointer<QPrinterInfoPrivate, QPrinterInfoPrivateDeleter> d_ptr;
 };