qt: discontinue hasContent and use isReady property in MLBaseModel

modules/gui/qt/medialibrary/mlbasemodel.cpp

@@ -40,8 +40,8 @@ MLBaseModel::MLBaseModel(QObject *parent)
 {
     connect( this, &MLBaseModel::resetRequested, this, &MLBaseModel::onResetRequested );
 
-    connect( this, &MLBaseModel::mlChanged, this, &MLBaseModel::hasContentChanged );
-    connect( this, &MLBaseModel::countChanged, this, &MLBaseModel::hasContentChanged );
+    connect( this, &MLBaseModel::mlChanged, this, &MLBaseModel::isReadyChanged );
+    connect( this, &MLBaseModel::countChanged, this, &MLBaseModel::isReadyChanged );
 }
 
 /* For std::unique_ptr, see Effective Modern C++, Item 22 */
@@ -468,6 +468,8 @@ void MLBaseModel::validateCache() const
             this, &MLBaseModel::onCacheBeginMoveRows);
 
     m_cache->initCount();
+
+    emit isReadyChanged();
 }
 
 
@@ -482,7 +484,10 @@ void MLBaseModel::resetCache()
 void MLBaseModel::invalidateCache()
 {
     if (m_cache)
+    {
         m_cache->invalidate();
+        emit isReadyChanged();
+    }
     else
         validateCache();
 }
@@ -624,7 +629,7 @@ MLQueryParams MLBaseModel::BaseLoader::getParams(size_t index, size_t count) con
     return { m_searchPattern.toUtf8(), m_sort, m_sort_desc, index, count };
 }
 
-bool MLBaseModel::hasContent() const
+bool MLBaseModel::isReady() const
 {
-    return m_mediaLib && (getCount() > 0);
+    return (m_mediaLib && m_cache && (m_cache->count() != COUNT_UNINITIALIZED));
 }

modules/gui/qt/medialibrary/mlbasemodel.hpp

@@ -57,7 +57,8 @@ class MLBaseModel : public QAbstractListModel
 
     Q_PROPERTY(unsigned int count READ getCount NOTIFY countChanged FINAL)
 
-    Q_PROPERTY(bool hasContent READ hasContent NOTIFY hasContentChanged FINAL)
+    // isReady is true when ml is not null pointer and cache count is not uninitialized
+    Q_PROPERTY(bool isReady READ isReady NOTIFY isReadyChanged FINAL)
 
 public:
     explicit MLBaseModel(QObject *parent = nullptr);
@@ -88,7 +89,7 @@ signals:
     void sortOrderChanged();
     void sortCriteriaChanged();
     void countChanged(unsigned int) const;
-    void hasContentChanged();
+    void isReadyChanged() const;
 
 protected slots:
     void onResetRequested();
@@ -174,7 +175,7 @@ public:
     int rowCount(const QModelIndex &parent = {}) const override;
     virtual unsigned int getCount() const;
 
-    bool hasContent() const;
+    bool isReady() const;
 
 private:
     void onCacheDataChanged(int first, int last);

modules/gui/qt/medialibrary/qml/MusicAlbums.qml

@@ -332,7 +332,7 @@ FocusScope {
 
     EmptyLabelButton {
         anchors.fill: parent
-        visible: !albumModelId.hasContent
+        visible: albumModelId.isReady && (albumModelId.count <= 0)
         focus: visible
         text: I18n.qtr("No albums found\nPlease try adding sources, by going to the Browse tab")
         Navigation.parentItem: root

modules/gui/qt/medialibrary/qml/MusicAllArtists.qml

@@ -273,7 +273,7 @@ FocusScope {
 
     EmptyLabelButton {
         anchors.fill: parent
-        visible: !artistModel.hasContent
+        visible: artistModel.isReady && (artistModel.count <= 0)
         focus: visible
         text: I18n.qtr("No artists found\nPlease try adding sources, by going to the Browse tab")
         Navigation.parentItem: root

modules/gui/qt/medialibrary/qml/MusicArtistsAlbums.qml

@@ -250,7 +250,7 @@ FocusScope {
 
     EmptyLabelButton {
         anchors.fill: parent
-        visible: !artistModel.hasContent
+        visible: artistModel.isReady && (artistModel.count <= 0)
         focus: visible
         text: I18n.qtr("No artists found\nPlease try adding sources, by going to the Browse tab")
         Navigation.parentItem: root

modules/gui/qt/medialibrary/qml/MusicGenres.qml

@@ -342,7 +342,7 @@ FocusScope {
 
     EmptyLabelButton {
         anchors.fill: parent
-        visible: !genreModel.hasContent
+        visible: genreModel.isReady && (genreModel.count <= 0)
         focus: visible
         text: I18n.qtr("No genres found\nPlease try adding sources, by going to the Browse tab")
         Navigation.parentItem: root

modules/gui/qt/medialibrary/qml/MusicTracksDisplay.qml

@@ -74,7 +74,7 @@ FocusScope {
 
     EmptyLabelButton {
         anchors.fill: parent
-        visible: !tracklistdisplay_id.model.hasContent
+        visible: tracklistdisplay_id.model.isReady && (tracklistdisplay_id.model.count <= 0)
         focus: visible
         text: I18n.qtr("No tracks found\nPlease try adding sources, by going to the Browse tab")
         Navigation.parentItem: root

modules/gui/qt/medialibrary/qml/PlaylistMediaDisplay.qml

@@ -197,7 +197,7 @@ FocusScope {
     EmptyLabelButton {
         anchors.fill: parent
 
-        visible: !model.hasContent
+        visible: model.isReady && (model.count <= 0)
 
         focus: visible
 

modules/gui/qt/medialibrary/qml/VideoAll.qml

@@ -379,7 +379,7 @@ FocusScope {
         coverWidth : VLCStyle.dp(182, VLCStyle.scale)
         coverHeight: VLCStyle.dp(114, VLCStyle.scale)
 
-        visible: !model.hasContent
+        visible: model.isReady && (model.count <= 0)
 
         focus: visible