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, 36 insertions, 0 deletions

diff --git a/src/kitemviews/kfileitemmodelrolesupdater.cpp b/src/kitemviews/kfileitemmodelrolesupdater.cpp
index 7b0d75dba..efcf6b4cc 100644
--- a/src/kitemviews/kfileitemmodelrolesupdater.cpp
+++ b/src/kitemviews/kfileitemmodelrolesupdater.cpp
@@ -33,6 +33,10 @@
 #include <QElapsedTimer>
 #include <QTimer>
 
+#ifdef HAVE_NEPOMUK
+    #include "knepomukrolesprovider_p.h"
+#endif
+
 // Required includes for subItemsCount():
 #ifdef Q_WS_WIN
     #include <QDir>
@@ -74,6 +78,10 @@ KFileItemModelRolesUpdater::KFileItemModelRolesUpdater(KFileItemModel* model, QO
     m_previewJobs(),
     m_changedItemsTimer(0),
     m_changedItems()
+  #ifdef HAVE_NEPOMUK
+  , m_resolveNepomukRoles(false)
+  #endif
+
 {
     Q_ASSERT(model);
 
@@ -219,6 +227,23 @@ void KFileItemModelRolesUpdater::setRoles(const QSet<QByteArray>& roles)
     if (m_roles != roles) {
         m_roles = roles;
 
+#ifdef HAVE_NEPOMUK
+        // Check whether there is at least one role that must be resolved
+        // with the help of Nepomuk. If this is the case, m_resolveNepomukRoles
+        // will be set to true and the (quite expensive) resolving will be done
+        // in KFileItemModelRolesUpdater::rolesData().
+        const KNepomukRolesProvider& rolesProvider = KNepomukRolesProvider::instance();
+        m_resolveNepomukRoles = false;
+        QSetIterator<QByteArray> it(roles);
+        while (it.hasNext()) {
+            const QByteArray& role = it.next();
+            if (rolesProvider.isNepomukRole(role)) {
+                m_resolveNepomukRoles = true;
+                break;
+            }
+        }
+#endif
+
         if (m_paused) {
             m_rolesChangedDuringPausing = true;
         } else {
@@ -754,6 +779,17 @@ QHash<QByteArray, QVariant> KFileItemModelRolesUpdater::rolesData(const KFileIte
 
     data.insert("iconOverlays", item.overlays());
 
+#ifdef HAVE_NEPOMUK
+    if (m_resolveNepomukRoles) {
+        const KNepomukRolesProvider& rolesProvider = KNepomukRolesProvider::instance();
+        QHashIterator<QByteArray, QVariant> it(rolesProvider.roleValues(item.url(), m_roles));
+        while (it.hasNext()) {
+            it.next();
+            data.insert(it.key(), it.value());
+        }
+    }
+#endif
+
     return data;
 }