Implement group-header layouting

The most tricky part for groups - the layouting - basically works
now for all views (grouping was available only in the icons views
for Dolphin 1.x) and is nearly equally fast as without groups.

Still open:
- Group headers are ugly screen rectangles
- Return valid groups in KFileItemModel instead of the currently
  hardcoded testing values
- Dynamically turning on/off groups does not work currently, the
  directory must be reentered

1 files changed, 6 insertions, 2 deletions

diff --git a/src/kitemviews/kfileitemmodel.cpp b/src/kitemviews/kfileitemmodel.cpp
index 3a49135f9..46de7c5aa 100644
--- a/src/kitemviews/kfileitemmodel.cpp
+++ b/src/kitemviews/kfileitemmodel.cpp
@@ -225,15 +225,19 @@ QString KFileItemModel::roleDescription(const QByteArray& role) const
 
 QList<QPair<int, QVariant> > KFileItemModel::groups() const
 {
-    // TODO:
+    // TODO: dirty hack for initial testing of grouping functionality
     QPair<int, QVariant> group1(0, "Group 1");
-    QPair<int, QVariant> group2(5, "Group 2");
+    QPair<int, QVariant> group2(2, "Group 2");
     QPair<int, QVariant> group3(10, "Group 3");
+    QPair<int, QVariant> group4(11, "Group 4");
+    QPair<int, QVariant> group5(40, "Group 5");
 
     QList<QPair<int, QVariant> > groups;
     groups.append(group1);
     groups.append(group2);
     groups.append(group3);
+    groups.append(group4);
+    groups.append(group5);
     return groups;
 }