Utils: Introduce a way to immediate force aspect value saving

Will be used for e.g. valgrinds error categories. These are handled
by actions in a menu outside the settings page mechanism.

Change-Id: I2dea9b9f13dbc92fa3e9938f85aa083d01d0d99b
Reviewed-by: Marcus Tillmanns <marcus.tillmanns@qt.io>

src/libs/utils/aspects.cpp

@@ -412,6 +412,22 @@ void BaseAspect::setSettingsKey(const QString &group, const QString &key)
     d->m_settingsKey = group + "/" + key;
 }
 
+/*!
+    Immediately writes the value of this aspect into its specified
+    settings, taking a potential container's settings group specification
+    into account.
+
+    \note This is expensive, so it should only be used with good reason.
+*/
+void BaseAspect::writeToSettingsImmediatly() const
+{
+    QStringList groups;
+    if (d->m_container)
+        groups = d->m_container->settingsGroups();
+    const SettingsGroupNester nester(groups);
+    writeSettings();
+}
+
 /*!
     Returns the string that should be used when this action appears in menus
     or other places that are typically used with Book style capitalization.
@@ -2344,28 +2360,16 @@ void AspectContainer::toMap(QVariantMap &map) const
 
 void AspectContainer::readSettings()
 {
-    QTC_ASSERT(theSettings, return);
-    for (const QString &group : d->m_settingsGroup)
-        theSettings->beginGroup(group);
-
+    const SettingsGroupNester nester(d->m_settingsGroup);
     for (BaseAspect *aspect : std::as_const(d->m_items))
         aspect->readSettings();
-
-    for (int i = 0; i != d->m_settingsGroup.size(); ++i)
-        theSettings->endGroup();
 }
 
 void AspectContainer::writeSettings() const
 {
-    QTC_ASSERT(theSettings, return);
-    for (const QString &group : d->m_settingsGroup)
-        theSettings->beginGroup(group);
-
+    const SettingsGroupNester nester(d->m_settingsGroup);
     for (BaseAspect *aspect : std::as_const(d->m_items))
         aspect->writeSettings();
-
-    for (int i = 0; i != d->m_settingsGroup.size(); ++i)
-        theSettings->endGroup();
 }
 
 void AspectContainer::setSettingsGroup(const QString &groupKey)
@@ -2378,6 +2382,11 @@ void AspectContainer::setSettingsGroups(const QString &groupKey, const QString &
     d->m_settingsGroup = QStringList{groupKey, subGroupKey};
 }
 
+QStringList AspectContainer::settingsGroups() const
+{
+    return d->m_settingsGroup;
+}
+
 void AspectContainer::apply()
 {
     const bool willChange = isDirty();
@@ -2579,4 +2588,22 @@ void BaseAspect::Data::Ptr::operator=(const Ptr &other)
     m_data = other.m_data->clone();
 }
 
+// SettingsGroupNester
+
+SettingsGroupNester::SettingsGroupNester(const QStringList &groups)
+    : m_groupCount(groups.size())
+{
+    QTC_ASSERT(theSettings, return);
+    for (const QString &group : groups)
+        theSettings->beginGroup(group);
+}
+
+SettingsGroupNester::~SettingsGroupNester()
+{
+    QTC_ASSERT(theSettings, return);
+    for (int i = 0; i != m_groupCount; ++i)
+        theSettings->endGroup();
+}
+
+
 } // namespace Utils

src/libs/utils/aspects.h

@@ -165,6 +165,9 @@ public:
     static void setSettings(QSettings *settings);
     static QSettings *settings();
 
+    // This is expensive. Do not use without good reason
+    void writeToSettingsImmediatly() const;
+
 signals:
     void changed(); // "internal"
     void volatileValueChanged();
@@ -728,6 +731,18 @@ private:
     QList<BaseAspect::Data::Ptr> m_data; // Owned.
 };
 
+class QTCREATOR_UTILS_EXPORT SettingsGroupNester
+{
+    Q_DISABLE_COPY_MOVE(SettingsGroupNester)
+
+public:
+    explicit SettingsGroupNester(const QStringList &groups);
+    ~SettingsGroupNester();
+
+private:
+    const int m_groupCount;
+};
+
 class QTCREATOR_UTILS_EXPORT AspectContainer : public QObject
 {
     Q_OBJECT
@@ -758,6 +773,7 @@ public:
 
     void setSettingsGroup(const QString &groupKey);
     void setSettingsGroups(const QString &groupKey, const QString &subGroupKey);
+    QStringList settingsGroups() const;
 
     void apply();
     void cancel();