Work around irrlicht list limitations with dark magic

git-svn-id: svn+ssh://svn.code.sf.net/p/supertuxkart/code/main/trunk@5345 178a84e3-b1eb-0310-8ba1-8eac791a3b58

src/guiengine/event_handler.cpp

@@ -22,6 +22,7 @@
 #include "guiengine/modaldialog.hpp"
 #include "guiengine/screen.hpp"
 #include "guiengine/widget.hpp"
+#include "guiengine/widgets/list_widget.hpp"
 #include "guiengine/widgets/ribbon_widget.hpp"
 #include "input/input_manager.hpp"
 #include "states_screens/state_manager.hpp"
@@ -389,19 +390,18 @@ void EventHandler::navigateUp(const int playerID, Input::InputType type, const b
     // components
     if (w != NULL && w->m_type == WTYPE_LIST)
     {
-        IGUIListBox* list = (IGUIListBox*)(w->m_element);
-        assert(list != NULL);
+        ListWidget* list = (ListWidget*)w;
         
-        const bool stay_within_list = list->getSelected() > 0;
+        const bool stay_within_list = list->getSelectionID() > 0;
         
         if (stay_within_list)
         {
-            list->setSelected(list->getSelected()-1);
+            list->setSelectionID(list->getSelectionID()-1);
             return;
         }
         else
         {
-            list->setSelected(-1);
+            list->setSelectionID(-1);
         }
     }
     
@@ -496,19 +496,18 @@ void EventHandler::navigateDown(const int playerID, Input::InputType type, const
     // components
     if (w != NULL && w->m_type == WTYPE_LIST)
     {
-        IGUIListBox* list = w->getIrrlichtElement<IGUIListBox>();
-        assert(list != NULL);
+        ListWidget* list = (ListWidget*)w;
         
-        const bool stay_within_list = list->getSelected() < (int)list->getItemCount()-1;
+        const bool stay_within_list = list->getSelectionID() < list->getItemCount()-1;
             
         if (stay_within_list)
         {
-            list->setSelected(list->getSelected()+1);
+            list->setSelectionID(list->getSelectionID()+1);
             return;
         }
         else
         {
-            list->setSelected(-1);
+            list->setSelectionID(-1);
         }
     }
     

src/guiengine/widgets/list_widget.cpp

@@ -39,6 +39,7 @@ void ListWidget::add()
     rect<s32> widget_size = rect<s32>(x, y, x + w, y + h);
     
     IGUIListBox* list = GUIEngine::getGUIEnv()->addListBox (widget_size, m_parent, getNewID());
+    list->setAutoScrollEnabled(false);
     
     if (m_use_icons)
     {
@@ -115,3 +116,37 @@ void ListWidget::unfocused(const int playerID)
 }
 
 // -----------------------------------------------------------------------------
+
+int ListWidget::getSelectionID() const
+{
+    return getIrrlichtElement<IGUIListBox>()->getSelected();
+}
+
+// -----------------------------------------------------------------------------
+
+void ListWidget::setSelectionID(const int index)
+{
+    IGUIListBox* irritem = getIrrlichtElement<IGUIListBox>();
+    
+    // auto-scroll to item when selecting something, don't auto-scroll when selecting nothing
+    if (index != -1)
+    {
+        irritem->setAutoScrollEnabled(true);
+    }
+    
+    irritem->setSelected(index);
+    
+    if (index != -1)
+    {
+        irritem->setAutoScrollEnabled(false);
+    }
+}
+
+// -----------------------------------------------------------------------------
+
+int ListWidget::getItemCount() const
+{
+    return getIrrlichtElement<IGUIListBox>()->getItemCount();
+}
+
+// -----------------------------------------------------------------------------

src/guiengine/widgets/list_widget.hpp

@@ -47,6 +47,18 @@ namespace GUIEngine
         int getSelection() const;
         std::string getSelectionName() const;
         void clear();
+        
+        /** \return the number of items in the list */
+        int getItemCount() const;
+        
+        /** \return the index of the selected element within the list, or -1 if none */
+        int getSelectionID() const;
+        
+        /**
+          * \brief change the selected item
+          * \param index the index of the element to select within the list, or -1 to select nothing
+          */
+        void setSelectionID(const int index);
     };
 }