[FreeRCT] Using the scroll bar to change the position of sho

Index: /home/r2d2/ApenasMeu/Dropbox/ProjectFreeRCT/src/ride_gui.cpp
===================================================================
--- /home/r2d2/ApenasMeu/Dropbox/ProjectFreeRCT/src/ride_gui.cpp    (revisão 1237)
+++ /home/r2d2/ApenasMeu/Dropbox/ProjectFreeRCT/src/ride_gui.cpp    (cópia de trabalho)
@@ -275,13 +275,13 @@
        }
        case RSEL_ROT_POS:
            _shop_placer.orientation = (TileEdge)((_shop_placer.orientation + 3) & 3);
-           this->MarkWidgetDirty(RSEL_DISPLAY);
+           //this->MarkWidgetDirty(RSEL_DISPLAY);
            _shop_placer.Rotated();
            break;

        case RSEL_ROT_NEG:
            _shop_placer.orientation = (TileEdge)((_shop_placer.orientation + 1) & 3);
-           this->MarkWidgetDirty(RSEL_DISPLAY);
+           //this->MarkWidgetDirty(RSEL_DISPLAY);
            _shop_placer.Rotated();
            break;
    }
@@ -555,6 +555,22 @@
    }
 }

+void ShopPlacementManager::OnMouseWheelEvent(Viewport* vp, int direction) {
+   #define WHEEL_DOWN -1
+   #define WHEEL_UP 1
+
+   if (direction == WHEEL_DOWN) {
+       this->orientation = (TileEdge)((_shop_placer.orientation + 1) & 3);
+   } else if (direction == WHEEL_UP) {
+       this->orientation = (TileEdge)((_shop_placer.orientation + 3) & 3);
+   }
+
+   #undef WHEEL_DOWN
+   #undef WHEEL_UP
+
+   Rotated();
+}
+
 void ShopPlacementManager::OnMouseMoveEvent(Viewport *vp, const Point16 &old_pos, const Point16 &pos)
 {
    this->mouse_pos = pos;
Index: /home/r2d2/ApenasMeu/Dropbox/ProjectFreeRCT/src/shop_placement.h
===================================================================
--- /home/r2d2/ApenasMeu/Dropbox/ProjectFreeRCT/src/shop_placement.h    (revisão 1237)
+++ /home/r2d2/ApenasMeu/Dropbox/ProjectFreeRCT/src/shop_placement.h    (cópia de trabalho)
@@ -44,6 +44,7 @@
    void LeaveMode() override;
    bool EnableCursors() override;

+   void OnMouseWheelEvent(Viewport* vp, int direction) override;
    void OnMouseMoveEvent(Viewport *vp, const Point16 &old_pos, const Point16 &pos) override;
    void OnMouseButtonEvent(Viewport *vp, uint8 state) override;