Details view: Fix indicator-branches

Up to now no indicator-branches have been drawn when showing a tree. The patch
fixes this so that that the style-dependent branches are drawn.

The main part of the patch is the implementation of
KItemListView::updateSiblingsInformation(). Most of the other changes are
related due to an internal renaming of the expansionsLevel-role to
expandedParentsCount and some related cleanups.

BUG: 290276
FIXED-IN: 4.8.1

1 files changed, 14 insertions, 0 deletions

diff --git a/src/kitemviews/kitemlistview.h b/src/kitemviews/kitemlistview.h
index 6ed714b20..dbb746d92 100644
--- a/src/kitemviews/kitemlistview.h
+++ b/src/kitemviews/kitemlistview.h
@@ -497,6 +497,20 @@ private:
     void updateGroupHeaderHeight();
 
     /**
+     * Updates the siblings-information for all visible items that are inside
+     * the range of \p firstIndex and \p lastIndex.
+     * @see KItemListWidget::setSiblingsInformation()
+     */
+    void updateSiblingsInformation(int firstIndex, int lastIndex);
+
+    /**
+     * Helper method for updateExpansionIndicators().
+     * @return True if the item with the index \a index has a sibling successor
+     *         (= the item is not the last item of the current hierarchy).
+     */
+    bool hasSiblingSuccessor(int index) const;
+
+    /**
      * Helper function for triggerAutoScrolling().
      * @param pos    Logical position of the mouse relative to the range.
      * @param range  Range of the visible area.