call (re)paint function just for needed entries

diff --git a/lib/gui/elistbox.cpp b/lib/gui/elistbox.cpp
index 09d5ec2..f3028ae 100644 (file)
--- a/lib/gui/elistbox.cpp
+++ b/lib/gui/elistbox.cpp
@@ -310,10 +310,23 @@ int eListbox::event(int event, void *data, void *data2)
                m_content->cursorSave();
                m_content->cursorMove(m_top - m_selected);
                
+               gRegion entryrect = eRect(0, 0, size().width(), m_itemheight);
+               const gRegion &paint_region = *(gRegion*)data;
+               
                for (int y = 0, i = 0; i <= m_items_per_page; y += m_itemheight, ++i)
                {
-                       m_content->paint(painter, *style, ePoint(0, y), m_selected == m_content->cursorGet() && m_content->size() && m_selection_enabled);
+                       gRegion entry_clip_rect = paint_region & entryrect;
+
+                       if (!entry_clip_rect.empty())
+                               m_content->paint(painter, *style, ePoint(0, y), m_selected == m_content->cursorGet() && m_content->size() && m_selection_enabled);
+
+                               /* (we could clip with entry_clip_rect, but 
+                                  this shouldn't change the behaviour of any
+                                  well behaving content, so it would just
+                                  degrade performance without any gain.) */
+
                        m_content->cursorMove(+1);
+                       entryrect.moveBy(ePoint(0, m_itemheight));
                }
 
                if (m_scrollbar && m_scrollbar->isVisible())