Allow showing Nepomuk metadata inside views

Metadata like image-size, rating, comments, tags, ... can be shown
now in the view (e.g. as column in the Details mode).

Still open: The rating-information needs to be shown as stars.

In the context of this feature also the following bugs have been
fixed:
- Fix visual glitches in the header of the Details mode
- Improve the minimum column width calculation to respect also
  the headling and not only the content

BUG: 296782
FIXED-IN: 4.9.0

1 files changed, 10 insertions, 0 deletions

diff --git a/src/kitemviews/kfileitemmodel.h b/src/kitemviews/kfileitemmodel.h
index 0b1885a8c..4824dec3d 100644
--- a/src/kitemviews/kfileitemmodel.h
+++ b/src/kitemviews/kfileitemmodel.h
@@ -162,8 +162,16 @@ public:
     {   QByteArray role;
         QString translation;
         QString group;
+        bool requiresNepomuk;
+        bool requiresIndexer;
     };
 
+    /**
+     * @return Provides static information for all available roles that
+     *         are supported by KFileItemModel. Some roles can only be
+     *         determined if Nepomuk is enabled and/or the Nepomuk
+     *         indexing is enabled.
+     */
     static QList<RoleInfo> rolesInformation();
 
 signals:
@@ -344,6 +352,8 @@ private:
         const char* const roleTranslation;
         const char* const groupTranslationContext;
         const char* const groupTranslation;
+        const bool requiresNepomuk;
+        const bool requiresIndexer;
     };
 
     /**