fixed #597

project/media.cpp

@@ -86,7 +86,6 @@ void Media::set_footage(FootagePtr f) {
 }
 
 void Media::set_sequence(SequencePtr s) {
-  // ensure icon setting occurs in a separate thread
   set_icon(":/icons/sequence.svg");
   type = MEDIA_TYPE_SEQUENCE;
   object = VoidPtr(s);
@@ -94,7 +93,9 @@ void Media::set_sequence(SequencePtr s) {
 }
 
 void Media::set_folder() {
-  if (folder_name.isEmpty()) folder_name = QCoreApplication::translate("Media", "New Folder");
+  if (folder_name.isEmpty()) {
+    folder_name = QCoreApplication::translate("Media", "New Folder");
+  }
   set_icon(":/icons/folder.svg");
   type = MEDIA_TYPE_FOLDER;
   object = nullptr;

project/projectmodel.cpp

@@ -115,7 +115,30 @@ QModelIndex ProjectModel::parent(const QModelIndex &index) const {
 	if (parentItem == root_item)
 		return QModelIndex();
 
-	return createIndex(parentItem->row(), 0, parentItem);
+  return createIndex(parentItem->row(), 0, parentItem);
+}
+
+bool ProjectModel::canFetchMore(const QModelIndex &parent) const
+{
+
+  // Mostly implementing this because QSortFilterProxyModel will actually *ignore* a "true" result from hasChildren()
+  // and then query this value for a "true" result. So we need to override both this and hasChildren() to show a
+  // persistent childIndicator for folder items.
+
+  if (parent.isValid()
+      && static_cast<Media*>(parent.internalPointer())->get_type() == MEDIA_TYPE_FOLDER) {
+    return true;
+  }
+  return QAbstractItemModel::canFetchMore(parent);
+}
+
+bool ProjectModel::hasChildren(const QModelIndex &parent) const
+{
+  if (parent.isValid()
+      && static_cast<Media*>(parent.internalPointer())->get_type() == MEDIA_TYPE_FOLDER) {
+    return true;
+  }
+  return QAbstractItemModel::hasChildren(parent);
 }
 
 bool ProjectModel::setData(const QModelIndex &index, const QVariant &value, int role) {
@@ -132,7 +155,7 @@ bool ProjectModel::setData(const QModelIndex &index, const QVariant &value, int
 }
 
 int ProjectModel::rowCount(const QModelIndex &parent) const {
-	Media *parentItem;
+  Media *parentItem;
 	if (parent.column() > 0)
 		return 0;
 

project/projectmodel.h

@@ -27,41 +27,43 @@
 
 class ProjectModel : public QAbstractItemModel
 {
-	Q_OBJECT
+  Q_OBJECT
 public:
-	ProjectModel(QObject* parent = nullptr);
-	~ProjectModel() override;
+  ProjectModel(QObject* parent = nullptr);
+  ~ProjectModel() override;
 
-	void make_root();
-	void destroy_root();
-	void clear();
-    Media* get_root();
-	QVariant data(const QModelIndex &index, int role) const override;
-	Qt::ItemFlags flags(const QModelIndex &index) const override;
-	QVariant headerData(int section, Qt::Orientation orientation,
-						int role = Qt::DisplayRole) const override;
-	QModelIndex index(int row, int column,
-					  const QModelIndex &parent = QModelIndex()) const override;
-    QModelIndex create_index(int arow, int acolumn, void *adata);
-	QModelIndex parent(const QModelIndex &index) const override;
-	bool setData(const QModelIndex &index, const QVariant &value, int role = Qt::EditRole) override;
-	int rowCount(const QModelIndex &parent = QModelIndex()) const override;
-	int columnCount(const QModelIndex &parent = QModelIndex()) const override;
-    Media* getItem(const QModelIndex &index) const;
+  void make_root();
+  void destroy_root();
+  void clear();
+  Media* get_root();
+  QVariant data(const QModelIndex &index, int role) const override;
+  Qt::ItemFlags flags(const QModelIndex &index) const override;
+  QVariant headerData(int section, Qt::Orientation orientation,
+                      int role = Qt::DisplayRole) const override;
+  QModelIndex index(int row, int column,
+                    const QModelIndex &parent = QModelIndex()) const override;
+  QModelIndex create_index(int arow, int acolumn, void *adata);
+  QModelIndex parent(const QModelIndex &index) const override;
+  bool canFetchMore(const QModelIndex &parent) const override;
+  bool hasChildren(const QModelIndex &parent = QModelIndex()) const override;
+  bool setData(const QModelIndex &index, const QVariant &value, int role = Qt::EditRole) override;
+  int rowCount(const QModelIndex &parent = QModelIndex()) const override;
+  int columnCount(const QModelIndex &parent = QModelIndex()) const override;
+  Media* getItem(const QModelIndex &index) const;
 
-    void appendChild(Media* parent, Media* child);
-    void moveChild(Media* child, Media* to);
-    void removeChild(Media* parent, Media* m);
-    Media* child(int i, Media* parent = nullptr);
-    int childCount(Media* parent = nullptr);
-    void set_icon(Media* m, const QIcon &ico);
+  void appendChild(Media* parent, Media* child);
+  void moveChild(Media* child, Media* to);
+  void removeChild(Media* parent, Media* m);
+  Media* child(int i, Media* parent = nullptr);
+  int childCount(Media* parent = nullptr);
+  void set_icon(Media* m, const QIcon &ico);
 
 private:
-    Media* root_item;
+  Media* root_item;
 };
 
 namespace olive {
-    extern ProjectModel project_model;
+extern ProjectModel project_model;
 }
 
 #endif // PROJECTMODEL_H