Update active widgets on resolutions list when ribbon widget is scrolled

src/guiengine/widgets/dynamic_ribbon_widget.cpp

@@ -62,6 +62,9 @@ DynamicRibbonWidget::DynamicRibbonWidget(const bool combo, const bool multi_row)
     m_item_count_hint = 0;
 
     m_max_label_width = 0;
+
+    m_scroll_callback.callback = NULL;
+    m_scroll_callback.data = NULL;
 }
 // -----------------------------------------------------------------------------
 DynamicRibbonWidget::~DynamicRibbonWidget()
@@ -821,6 +824,11 @@ void DynamicRibbonWidget::scroll(int x_delta, bool evenIfDeactivated)
 
     updateItemDisplay();
 
+    if (m_scroll_callback.callback != NULL)
+    {
+        m_scroll_callback.callback(m_scroll_callback.data);
+    }
+
     // update selection markers in child ribbon
     if (m_combo)
     {

src/guiengine/widgets/dynamic_ribbon_widget.hpp

@@ -64,6 +64,12 @@ namespace GUIEngine
         unsigned int m_badges;
     };
 
+    struct DynamicRibbonScrollCallback
+    {
+        void* data;
+        void (*callback)(void* data);
+    };
+
     /**
       * \brief An extended version of RibbonWidget, with more capabilities.
       * A dynamic ribbon builds upon RibbonWidget, adding dynamic contents creation and sizing,
@@ -191,6 +197,7 @@ namespace GUIEngine
         /** Max length of a label, in characters */
         unsigned int m_max_label_length;
 
+        DynamicRibbonScrollCallback m_scroll_callback;
     public:
 
         LEAK_CHECK()
@@ -313,6 +320,12 @@ namespace GUIEngine
 
         /** Set max length of displayed text. */
         void setMaxLabelLength(int length) { m_max_label_length = length; }
+
+        void registerScrollCallback(void (*callback)(void* data), void* data)
+        { 
+            m_scroll_callback.callback = callback; 
+            m_scroll_callback.data = data;
+        }
     };
 
 }

src/states_screens/options/options_screen_video.cpp

@@ -191,11 +191,10 @@ void OptionsScreenVideo::init()
     assert( vsync != NULL );
     vsync->setState( UserConfigParams::m_vsync );
 
-
     // ---- video modes
     DynamicRibbonWidget* res = getWidget<DynamicRibbonWidget>("resolutions");
     assert(res != NULL);
-
+    res->registerScrollCallback(onScrollResolutionsList, this);
 
     CheckBoxWidget* full = getWidget<CheckBoxWidget>("fullscreen");
     assert( full != NULL );
@@ -398,6 +397,14 @@ void OptionsScreenVideo::updateResolutionsList()
 
 // ----------------------------------------------------------------------------
 
+void OptionsScreenVideo::onScrollResolutionsList(void* data)
+{
+    OptionsScreenVideo* screen = (OptionsScreenVideo*)data;
+    screen->updateResolutionsList();
+}
+
+// ----------------------------------------------------------------------------
+
 void OptionsScreenVideo::updateGfxSlider()
 {
     GUIEngine::SpinnerWidget* gfx =

src/states_screens/options/options_screen_video.hpp

@@ -89,8 +89,8 @@ private:
 
     void updateTooltip();
     void updateResolutionsList();
-
     void initPresets();
+    static void onScrollResolutionsList(void* data);
 public:
     friend class GUIEngine::ScreenSingleton<OptionsScreenVideo>;