Add defaultLogLevel to LoggingCategory

Add possibility to define default logging category log level.
Just like in QLoggingCategory constructor.

[ChangeLog][QML Elements][LoggingCategory] Added defaultLogLevel property.
It is possible to define default log level that LoggingCategory
is enabled for.

Task-number: QTBUG-67094
Change-Id: I12557dfb7c228c40b325d0dccde4c525acae0300
Reviewed-by: Michael Brasser <michael.brasser@live.com>

4 files changed, 62 insertions, 6 deletions

diff --git a/src/imports/qtqml/plugins.qmltypes b/src/imports/qtqml/plugins.qmltypes
index 82333627a0..caa04b04bb 100644
--- a/src/imports/qtqml/plugins.qmltypes
+++ b/src/imports/qtqml/plugins.qmltypes
@@ -198,9 +198,20 @@ Module {
     Component {
         name: "QQmlLoggingCategory"
         prototype: "QObject"
-        exports: ["QtQml/LoggingCategory 2.8"]
-        exportMetaObjectRevisions: [0]
+        exports: ["QtQml/LoggingCategory 2.12", "QtQml/LoggingCategory 2.8"]
+        exportMetaObjectRevisions: [1, 0]
+        Enum {
+            name: "DefaultLogLevel"
+            values: {
+                "Debug": 0,
+                "Info": 4,
+                "Warning": 1,
+                "Critical": 2,
+                "Fatal": 3
+            }
+        }
         Property { name: "name"; type: "string" }
+        Property { name: "defaultLogLevel"; revision: 1; type: "DefaultLogLevel" }
     }
     Component {
         name: "QQmlTimer"
diff --git a/src/qml/qml/qqmlengine.cpp b/src/qml/qml/qqmlengine.cpp
index 759d86c789..119120572c 100644
--- a/src/qml/qml/qqmlengine.cpp
+++ b/src/qml/qml/qqmlengine.cpp
@@ -228,7 +228,9 @@ void QQmlEnginePrivate::registerBaseTypes(const char *uri, int versionMajor, int
     qmlRegisterType<QQmlInstantiator>(uri, versionMajor, (versionMinor < 1 ? 1 : versionMinor), "Instantiator"); //Only available in >=2.1
     qmlRegisterCustomType<QQmlConnections>(uri, versionMajor, versionMinor,"Connections", new QQmlConnectionsParser);
     qmlRegisterType<QQmlInstanceModel>();
-    qmlRegisterType<QQmlLoggingCategory>(uri, versionMajor, (versionMinor < 8 ? 8 : versionMinor), "LoggingCategory"); //Only available in >=2.8
+
+    qmlRegisterType<QQmlLoggingCategory>(uri, versionMajor, 8, "LoggingCategory"); //Only available in >=2.8
+    qmlRegisterType<QQmlLoggingCategory,1>(uri, versionMajor, 12, "LoggingCategory"); //Only available in >=2.12
 }
 
 
diff --git a/src/qml/qml/qqmlloggingcategory.cpp b/src/qml/qml/qqmlloggingcategory.cpp
index 597fe458fa..b59a26e17e 100644
--- a/src/qml/qml/qqmlloggingcategory.cpp
+++ b/src/qml/qml/qqmlloggingcategory.cpp
@@ -59,6 +59,7 @@
         LoggingCategory {
             id: category
             name: "com.qt.category"
+            defaultLogLevel: LoggingCategory.Warning
         }
 
         Component.onCompleted: {
@@ -84,6 +85,17 @@
     \sa QLoggingCategory::categoryName()
 */
 
+/*!
+    \qmlproperty enumeration QtQml::LoggingCategory::defaultLogLevel
+    \since 5.12
+
+    Holds the default log level of the logging category. By default it is
+    created with the LoggingCategory.Debug log level.
+
+    \note This property needs to be set when declaring the LoggingCategory
+    and cannot be changed later.
+*/
+
 QQmlLoggingCategory::QQmlLoggingCategory(QObject *parent)
     : QObject(parent)
     , m_initialized(false)
@@ -99,6 +111,11 @@ QString QQmlLoggingCategory::name() const
     return QString::fromUtf8(m_name);
 }
 
+QQmlLoggingCategory::DefaultLogLevel QQmlLoggingCategory::defaultLogLevel() const
+{
+    return m_defaultLogLevel;
+}
+
 QLoggingCategory *QQmlLoggingCategory::category() const
 {
     return m_category.data();
@@ -111,10 +128,25 @@ void QQmlLoggingCategory::classBegin()
 void QQmlLoggingCategory::componentComplete()
 {
     m_initialized = true;
-    if (m_name.isNull())
+    if (m_name.isNull()) {
         qmlWarning(this) << QLatin1String("Declaring the name of the LoggingCategory is mandatory and cannot be changed later !");
+    } else {
+        QScopedPointer<QLoggingCategory> category(new QLoggingCategory(m_name.constData(), QtMsgType(m_defaultLogLevel)));
+        m_category.swap(category);
+    }
 }
 
+void QQmlLoggingCategory::setDefaultLogLevel(DefaultLogLevel defaultLogLevel)
+{
+    if (m_initialized) {
+        qmlWarning(this) << QLatin1String("The defaultLogLevel of a LoggingCategory cannot be changed after the Item is created");
+        return;
+    }
+
+    m_defaultLogLevel = defaultLogLevel;
+}
+
+
 void QQmlLoggingCategory::setName(const QString &name)
 {
     if (m_initialized) {
@@ -123,8 +155,6 @@ void QQmlLoggingCategory::setName(const QString &name)
     }
 
     m_name = name.toUtf8();
-    QScopedPointer<QLoggingCategory> category(new QLoggingCategory(m_name.constData()));
-    m_category.swap(category);
 }
 
 #include "moc_qqmlloggingcategory_p.cpp"
diff --git a/src/qml/qml/qqmlloggingcategory_p.h b/src/qml/qml/qqmlloggingcategory_p.h
index 544db1fe33..ece06e04b4 100644
--- a/src/qml/qml/qqmlloggingcategory_p.h
+++ b/src/qml/qml/qqmlloggingcategory_p.h
@@ -65,11 +65,23 @@ class QQmlLoggingCategory : public QObject, public QQmlParserStatus
     Q_INTERFACES(QQmlParserStatus)
 
     Q_PROPERTY(QString name READ name WRITE setName)
+    Q_PROPERTY(DefaultLogLevel defaultLogLevel READ defaultLogLevel WRITE setDefaultLogLevel REVISION 1)
 
 public:
+    enum DefaultLogLevel {
+        Debug = QtDebugMsg,
+        Info = QtInfoMsg,
+        Warning = QtWarningMsg,
+        Critical = QtCriticalMsg,
+        Fatal = QtFatalMsg
+    };
+    Q_ENUM(DefaultLogLevel);
+
     QQmlLoggingCategory(QObject *parent = nullptr);
     virtual ~QQmlLoggingCategory();
 
+    DefaultLogLevel defaultLogLevel() const;
+    void setDefaultLogLevel(DefaultLogLevel defaultLogLevel);
     QString name() const;
     void setName(const QString &name);
 
@@ -81,6 +93,7 @@ public:
 private:
     QByteArray m_name;
     QScopedPointer<QLoggingCategory> m_category;
+    DefaultLogLevel m_defaultLogLevel = Debug;
     bool m_initialized;
 };