(svn r20456) -Codechange: Add separate nested widget class for scrollbars.

1 files changed, 16 insertions, 0 deletions

diff --git a/src/widget_type.h b/src/widget_type.h
index da871df55..f61937aa8 100644
--- a/src/widget_type.h
+++ b/src/widget_type.h
@@ -502,6 +502,22 @@ public:
 };
 
 /**
+ * Nested widget to display and control a scrollbar in a window.
+ * Also assign the scrollbar to other widgets using #SetScrollbar() to make the mousewheel work.
+ * @ingroup NestedWidgets
+ */
+class NWidgetScrollbar : public NWidgetCore {
+public:
+	NWidgetScrollbar(WidgetType tp, Colours colour, int index);
+
+	/* virtual */ void SetupSmallestSize(Window *w, bool init_array);
+	/* virtual */ void Draw(const Window *w);
+
+	const Scrollbar *GetScrollbar(const Window *w) const;
+	Scrollbar *GetScrollbar(Window *w) const;
+};
+
+/**
  * Leaf widget.
  * @ingroup NestedWidgets
  */