From eb4f183127cb5c73fe84adc296fbc03fa8d61523 Mon Sep 17 00:00:00 2001
From: Olivier Goffart <ogoffart@woboq.com>
Date: Sat, 10 Dec 2011 10:58:09 +0100
Subject: Add a qDebug operator overload to handle registered enum

So if you stream enum type into qDebug, it will show the name
of the enum value instead of the int

Change-Id: Iec5e826623353560319890d3e7c4ab97d0645f4a
Reviewed-by: Marc Mutz <marc.mutz@kdab.com>
Reviewed-by: Shawn Rutledge <shawn.rutledge@digia.com>
---
 src/corelib/kernel/qobject.cpp | 14 ++++++++++++++
 src/corelib/kernel/qobject.h   | 10 ++++++++++
 2 files changed, 24 insertions(+)

(limited to 'src')

diff --git a/src/corelib/kernel/qobject.cpp b/src/corelib/kernel/qobject.cpp
index be6441933f..0a8369acbf 100644
--- a/src/corelib/kernel/qobject.cpp
+++ b/src/corelib/kernel/qobject.cpp
@@ -4105,6 +4105,20 @@ QDebug operator<<(QDebug dbg, const QObject *o)
     dbg << ')';
     return dbg;
 }
+
+QDebug qt_QMetaEnum_debugOperator(QDebug &dbg, int value, const QMetaObject *meta, const char *name)
+{
+    QDebugStateSaver saver(dbg);
+    QMetaEnum me = meta->enumerator(meta->indexOfEnumerator(name));
+    const char *key = me.valueToKey(value);
+    dbg.nospace() << meta->className() << "::" << name << '(';
+    if (key)
+        dbg << key;
+    else
+        dbg << value;
+    dbg << ')';
+    return dbg;
+}
 #endif
 
 /*!
diff --git a/src/corelib/kernel/qobject.h b/src/corelib/kernel/qobject.h
index 78f913acf8..20ff9981b1 100644
--- a/src/corelib/kernel/qobject.h
+++ b/src/corelib/kernel/qobject.h
@@ -547,6 +547,16 @@ template <class T> inline const char * qobject_interface_iid()
 
 #ifndef QT_NO_DEBUG_STREAM
 Q_CORE_EXPORT QDebug operator<<(QDebug, const QObject *);
+Q_CORE_EXPORT QDebug qt_QMetaEnum_debugOperator(QDebug&, int value, const QMetaObject *meta, const char *name);
+
+template<typename T>
+typename QtPrivate::QEnableIf<QtPrivate::IsQEnumHelper<T>::Value , QDebug>::Type
+operator<<(QDebug &dbg, T value)
+{
+    const QMetaObject *obj = qt_getEnumMetaObject(value);
+    const char *name = qt_getEnumName(value);
+    return qt_QMetaEnum_debugOperator(dbg, typename QFlags<T>::Int(value), obj, name);
+}
 #endif
 
 class QSignalBlocker
-- 
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