Fix Fl_Pack to support more box types.

Old code supported only frame styles, this code
can now handle box types with a background.

1 files changed, 8 insertions, 0 deletions

diff --git a/FL/Fl_Pack.H b/FL/Fl_Pack.H
index 3990a1907..334123115 100644
--- a/FL/Fl_Pack.H
+++ b/FL/Fl_Pack.H
@@ -21,6 +21,7 @@
 #define Fl_Pack_H
 
 #include <FL/Fl_Group.H>
+#include <FL/Fl_Rect.H>
 
 /**
   This widget was designed to add the functionality of compressing and
@@ -39,6 +40,12 @@
   resizable() widget is the last widget in the group it is extended to take
   the full available width or height, respectively, of the Fl_Pack group.
 
+  \note Fl_Pack is optimized to use a frame-only (`..._FRAME`) box type.
+    Box types with background graphics (`..._BOX`) generally work, but can be
+    slower witch a large number of children. Not all box types work well
+    with FL_Pack. Avoid irregular graphics like FL_DIAMOND_BOX and background
+    images.
+
   \note You can nest Fl_Pack widgets or put them inside Fl_Scroll widgets
     or inside other group widgets but their behavior can sometimes be
     <i>"surprising"</i>. This is partly due to the fact that Fl_Pack widgets
@@ -61,6 +68,7 @@ public:
   };
 
 protected:
+  void draw_filler_(const Fl_Rect& rect);
   void draw() override;
 
 public: