core, hide datasets if not in range of difficulty

src/core/ActivityInfo.cpp

@@ -234,12 +234,18 @@ void ActivityInfo::setLevels(const QStringList &levels)
 
 void ActivityInfo::fillDatasets(QQmlEngine *engine)
 {
+    quint32 levelMin = ApplicationSettings::getInstance()->filterLevelMin();
+    quint32 levelMax = ApplicationSettings::getInstance()->filterLevelMax();
     for(const QString &level: m_levels) {
         QString url = QString("qrc:/gcompris/src/activities/%1/resource/%2/Data.qml").arg(m_name.split('/')[0]).arg(level);
         QQmlComponent componentRoot(engine, QUrl(url));
         QObject *objectRoot = componentRoot.create();
         if(objectRoot != nullptr) {
             Dataset *dataset = qobject_cast<Dataset*>(objectRoot);
+            if(levelMin > dataset->difficulty() || levelMax < dataset->difficulty()) {
+                dataset->setEnabled(false);
+            }
+
             m_datasets[level] = dataset;
         } else {
             qDebug() << "ERROR: failed to load " << m_name << " " << componentRoot.errors();
@@ -304,10 +310,14 @@ void ActivityInfo::enableDatasetsBetweenDifficulties(quint32 levelMin, quint32 l
         Dataset *dataset = it.value();
         if(levelMin <= dataset->difficulty() && dataset->difficulty() <= levelMax) {
             newLevels << it.key();
+            dataset->setEnabled(true);
+        }
+        else {
+            dataset->setEnabled(false);
         }
     }
     setCurrentLevels(newLevels);
-    ApplicationSettings::getInstance()->setCurrentLevels(m_name, m_levels, false);
+    ApplicationSettings::getInstance()->setCurrentLevels(m_name, m_currentLevels, false);
 }
 
 Dataset *ActivityInfo::getDataset(const QString& name) const {

src/core/Dataset.cpp

@@ -23,7 +23,8 @@
 Dataset::Dataset(QObject *parent):
     QObject(parent),
     m_objective(""),
-    m_difficulty(0)
+    m_difficulty(0),
+    m_enabled(true)
 {
 }
 
@@ -57,3 +58,13 @@ void Dataset::setData(const QVariant &data)
     m_data = data;
     emit dataChanged();
 }
+
+bool Dataset::enabled() const
+{
+    return m_enabled;
+}
+void Dataset::setEnabled(const bool &enabled)
+{
+    m_enabled = enabled;
+    emit enabledChanged();
+}

src/core/Dataset.h

@@ -56,6 +56,10 @@ class Dataset : public QObject {
      * Content of the dataset (json array).
      */
     Q_PROPERTY(QVariant data READ data WRITE setData NOTIFY dataChanged)
+    /**
+     * If the dataset is enabled.
+     */
+    Q_PROPERTY(bool enabled READ enabled WRITE setEnabled NOTIFY enabledChanged)
 
 public:
     /// @cond INTERNAL_DOCS
@@ -66,17 +70,21 @@ public:
     quint32 difficulty() const;
     void setDifficulty(const quint32 &);
     QVariant data() const;
-    void setData(const QVariant &data);
+    void setData(const QVariant &);
+    bool enabled() const;
+    void setEnabled(const bool &);
 
 signals:
     void objectiveChanged();
     void difficultyChanged();
     void dataChanged();
+    void enabledChanged();
 
 private:
     QString m_objective;
     quint32 m_difficulty;
     QVariant m_data;
+    bool m_enabled;
 };
 
 #endif // DATASET_H

src/core/DialogChooseLevel.qml

@@ -122,7 +122,7 @@ Rectangle {
         difficultiesModel = []
         for(var level in currentActivity.levels) {
             var data = currentActivity.getDataset(currentActivity.levels[level])
-            difficultiesModel.push({"level": currentActivity.levels[level], "objective": data.objective, "difficulty": data.difficulty, "selectedInConfig": (chosenLevels.indexOf(currentActivity.levels[level]) != -1)})
+            difficultiesModel.push({"level": currentActivity.levels[level], "enabled": data.enabled, "objective": data.objective, "difficulty": data.difficulty, "selectedInConfig": (chosenLevels.indexOf(currentActivity.levels[level]) != -1)})
         }
         difficultiesRepeater.model = difficultiesModel
 
@@ -277,6 +277,7 @@ Rectangle {
                         id: difficultiesRepeater
                         delegate: Row {
                             height: objective.height
+                            visible: modelData.enabled
                             Image {
                                 id: difficultyIcon
                                 source: "qrc:/gcompris/src/core/resource/difficulty" +