Sliders react to mouse

src/guiengine/skin.cpp

@@ -1378,6 +1378,20 @@ void Skin::drawSpinnerBody(const core::recti &rect, Widget* widget,
                                             0 /* no clipping */, 0,
                                             true /* alpha */);
 
+        // ---- Set value by mouse position
+        const float max_value = (float)(w->getMax() - w->getMin()) /
+                                       (w->getMax() - w->getMin());
+
+        const core::recti mouse_area(rect.UpperLeftCorner.X + handle_size,
+                                    rect.UpperLeftCorner.Y,
+                                    rect.UpperLeftCorner.X + handle_size +
+                                           (int)((widget->m_w
+                                                  - 2*handle_size)*max_value),
+                                    rect.UpperLeftCorner.Y + widget->m_h);
+
+        const core::position2di mouse_position
+            = irr_driver->getDevice()->getCursorControl()->getPosition();
+        q->setValuesByMouse(mouse_position, mouse_area);
     }
 
     if (focused && widget->hasTooltip())

src/guiengine/widgets/spinner_widget.cpp

@@ -46,6 +46,7 @@ SpinnerWidget::SpinnerWidget(const bool gauge) : Widget(WTYPE_SPINNER)
     m_supports_multiplayer = true;
     m_value = -1;
     m_use_background_color=false;
+    m_allow_mouse_change = false;
     m_spinner_widget_player_id=-1;
     m_min = 0;
     m_max = 999;
@@ -432,3 +433,42 @@ void SpinnerWidget::setCustomText(const core::stringw& text)
     }
 }
 
+// -----------------------------------------------------------------------------
+
+void SpinnerWidget::setValuesByMouse(const core::position2di & mouse_position,
+                                     const core::recti & body_rect)
+{
+    if(body_rect.isPointInside(mouse_position))
+    {
+        if (m_allow_mouse_change)
+        {
+            float exact_hover = (float)((mouse_position.X -
+                body_rect.UpperLeftCorner.X) /
+                (float)body_rect.getWidth()) * (m_max-m_min) + 0.5f;
+
+            int new_value = ((exact_hover * (m_max-m_min)) / 
+                              (m_max-m_min))+m_min;
+            //Log::info("SpinnerWidget", "mouse_value: %d (%f)", 
+            //            mouse_value, exact_hover);
+
+            if (new_value > m_max) new_value = m_max;
+            if (new_value < m_min) new_value = m_min;
+
+            setValue(new_value);
+            EventHandler::get()->processGUIAction(
+                          PlayerAction::PA_MENU_SELECT,
+                          1, Input::MAX_VALUE,
+                          Input::IT_MOUSEBUTTON, false); //process the changes
+            m_allow_mouse_change = false;
+        }
+    }
+}
+
+// -----------------------------------------------------------------------------
+
+void SpinnerWidget::onClick()
+{
+    m_allow_mouse_change = true;
+}
+
+// -----------------------------------------------------------------------------

src/guiengine/widgets/spinner_widget.hpp

@@ -59,6 +59,7 @@ namespace GUIEngine
         
         int m_spinner_widget_player_id;
         bool m_use_background_color;
+        bool m_allow_mouse_change;
         
         /** If each value the spinner can take has an associated text, this vector will be non-empty */
         std::vector<irr::core::stringw> m_labels;
@@ -92,6 +93,9 @@ namespace GUIEngine
         /** \brief implementing method from base class Widget */
         virtual EventPropagation leftPressed(const int playerID);
 
+        /** \brief implementing method from base class Widget */
+        virtual void onClick();
+        
         /** When inferring widget size from its label length, this method will be called to
          * if/how much space must be added to the raw label's size for the widget to be large enough */
         virtual int getWidthNeededAroundLabel()  const { return 25; }
@@ -197,6 +201,10 @@ namespace GUIEngine
 
         /** Display custom text in spinner */
         void setCustomText(const core::stringw& text);
+
+        /** Set m_value based on mouse position */
+        void setValuesByMouse(const core::position2di & mouse_position,
+                              const core::recti & body_rect);
     };
 
 }