Refactor large static class Fl into an expandable namespace Fl (#1325)

* Change class Fl into namespace Fl.
* Untangle Fl namespace into themed headers.
* cut line count of FL/Fl.H in half
* FL/core subdirectory now holds short headers 
  grouped by functionality.

1 files changed, 42 insertions, 3 deletions

diff --git a/src/fl_boxtype.cxx b/src/fl_boxtype.cxx
index a78c74b4a..1569e58bd 100644
--- a/src/fl_boxtype.cxx
+++ b/src/fl_boxtype.cxx
@@ -23,7 +23,7 @@
 // boxtypes.  Other box types are in separate files so they are not
 // linked in if not used.
 
-#include <FL/Fl.H>
+#include "src/Fl_Private.H"
 #include <FL/Fl_Widget.H>
 #include <FL/fl_draw.H>
 #include <config.h>
@@ -46,8 +46,47 @@ static const uchar inactive_ramp[24] = {
   51, 51, 52, 52};
 static int draw_it_active = 1;
 
-int Fl::box_border_radius_max_ = 15;
-int Fl::box_shadow_width_ = 3;
+int Fl::Private::box_border_radius_max_ = 15;
+
+/** Get the maximum border radius of all "rounded" boxtypes in pixels.
+    \since 1.4.0
+*/
+int Fl::box_border_radius_max() {
+  return Private::box_border_radius_max_;
+}
+
+/** Set the maximum border radius of all "rounded" boxtypes in pixels.
+  Must be at least 5, default = 15.
+
+  \note This does \b not apply to the "round" boxtypes which have really round sides
+    (i.e. composed of half circles) as opposed to "rounded" boxtypes that have only
+    rounded corners with a straight border between corners.
+
+  The box border radius of "rounded" boxtypes is typically calculated as about 2/5 of
+  the box height or width, whichever is smaller. The upper limit can be set by this
+  method for all "rounded" boxtypes.
+  \since 1.4.0
+*/
+void Fl::box_border_radius_max(int R) {
+  Private::box_border_radius_max_ = R < 5 ? 5 : R;
+}
+
+int Fl::Private::box_shadow_width_ = 3;
+
+/** Get the box shadow width of all "shadow" boxtypes in pixels.
+  \since 1.4.0
+*/
+int Fl::box_shadow_width() {
+  return Private::box_shadow_width_;
+}
+
+/** Set the box shadow width of all "shadow" boxtypes in pixels.
+  Must be at least 1, default = 3. There is no upper limit.
+  \since 1.4.0
+*/
+void Fl::box_shadow_width(int W) {
+  Private::box_shadow_width_ = W < 1 ? 1 : W;
+}
 
 /**
   Determines if the currently drawn box is active or inactive.