Added drag&drop support for feeds/categories.

src/core/feedsmodel.cpp

@@ -265,7 +265,7 @@ bool FeedsModel::dropMimeData(const QMimeData *data, Qt::DropAction action, int
 
       if (dragged_item_root != target_item_root) {
         // Transferring of items between different accounts is not possible.
-        qApp->showGuiMessage(tr("Cannot perform drag \& drop operation."),
+        qApp->showGuiMessage(tr("Cannot perform drag & drop operation."),
                              tr("You can't transfer dragged item into different account, this is not supported."),
                              QSystemTrayIcon::Warning,
                              qApp->mainForm(),
@@ -275,31 +275,11 @@ bool FeedsModel::dropMimeData(const QMimeData *data, Qt::DropAction action, int
         return false;
       }
 
-      /*
-      if (dragged_item->kind() == RootItem::Feeed) {
-        qDebug("Drag-drop action for feed '%s' detected, editing the feed.", qPrintable(dragged_item->title()));
-
-        Feed *actual_feed = dragged_item->toFeed();
-        Feed *feed_new = new Feed(*actual_feed);
-
-        feed_new->setParent(target_item);
-        editFeed(actual_feed, feed_new);
-
-        emit requireItemValidationAfterDragDrop(indexForItem(actual_feed));
+      if (dragged_item->performDragDropChange(target_item)) {
+        // Drag & drop is supported by the dragged item and was
+        // completed on data level and in item hierarchy.
+        emit requireItemValidationAfterDragDrop(indexForItem(dragged_item));
       }
-      else if (dragged_item->kind() == RootItem::Cattegory) {
-        qDebug("Drag-drop action for category '%s' detected, editing the feed.", qPrintable(dragged_item->title()));
-
-        Category *actual_category = dragged_item->toCategory();
-        Category *category_new = new Category(*actual_category);
-
-        category_new->clearChildren();
-        category_new->setParent(target_item);
-        editCategory(actual_category, category_new);
-
-        emit requireItemValidationAfterDragDrop(indexForItem(actual_category));
-      }
-      */
     }
 
     return true;

src/core/rootitem.cpp

@@ -170,6 +170,10 @@ Qt::ItemFlags RootItem::additionalFlags() const {
   return Qt::NoItemFlags;
 }
 
+bool RootItem::performDragDropChange(RootItem *target_item) {
+  return false;
+}
+
 int RootItem::countOfAllMessages() const {
   int total_count = 0;
 

src/core/rootitem.h

@@ -113,6 +113,7 @@ class RootItem : public QObject {
     virtual int row() const;
     virtual QVariant data(int column, int role) const;
     virtual Qt::ItemFlags additionalFlags() const;
+    virtual bool performDragDropChange(RootItem *target_item);
 
     // Each item offers "counts" of messages.
     // Returns counts of messages of all child items summed up.

src/services/standard/standardcategory.cpp

@@ -94,6 +94,22 @@ Qt::ItemFlags StandardCategory::additionalFlags() const {
   return Qt::ItemIsDragEnabled | Qt::ItemIsDropEnabled;
 }
 
+bool StandardCategory::performDragDropChange(RootItem *target_item) {
+  StandardCategory *category_new = new StandardCategory(*this);
+  category_new->clearChildren();
+  category_new->setParent(target_item);
+
+  if (editItself(category_new)) {
+    serviceRoot()->feedsModel()->reassignNodeToNewParent(this, target_item);
+    delete category_new;
+    return true;
+  }
+  else {
+    delete category_new;
+    return false;
+  }
+}
+
 bool StandardCategory::editViaGui() {
   QPointer<FormStandardCategoryDetails> form_pointer = new FormStandardCategoryDetails(serviceRoot(), qApp->mainForm());
 

src/services/standard/standardcategory.h

@@ -45,6 +45,7 @@ class StandardCategory : public Category {
     // Returns the actual data representation of standard category.
     QVariant data(int column, int role) const;
     Qt::ItemFlags additionalFlags() const;
+    bool performDragDropChange(RootItem *target_item);
 
     bool canBeEdited() {
       return true;

src/services/standard/standardfeed.cpp

@@ -440,6 +440,21 @@ Qt::ItemFlags StandardFeed::additionalFlags() const {
   return Qt::ItemIsDragEnabled;
 }
 
+bool StandardFeed::performDragDropChange(RootItem *target_item) {
+  StandardFeed *feed_new = new StandardFeed(*this);
+  feed_new->setParent(target_item);
+
+  if (editItself(feed_new)) {
+    serviceRoot()->feedsModel()->reassignNodeToNewParent(this, target_item);
+    delete feed_new;
+    return true;
+  }
+  else {
+    delete feed_new;
+    return false;
+  }
+}
+
 int StandardFeed::update() {
   QByteArray feed_contents;
   int download_timeout = qApp->settings()->value(GROUP(Feeds), SETTING(Feeds::UpdateTimeout)).toInt();

src/services/standard/standardfeed.h

@@ -82,6 +82,7 @@ class StandardFeed : public Feed {
     // Obtains data related to this feed.
     QVariant data(int column, int role) const;
     Qt::ItemFlags additionalFlags() const;
+    bool performDragDropChange(RootItem *target_item);
 
     // Perform fetching of new messages. Returns number of newly updated messages.
     int update();