Improve subclassing cababilities of Fl_Tile (STR 2791)

- remove static variables and functions
- make move_intersection() virtual
- add (protected) cursor access methods

These changes were inspired by STR 2791 where the user proposing an
enhancement was not able to subclass Fl_Tile properly. This commit
fixes the mentioned issues and enables subclassing without copying
internal code.

1 files changed, 9 insertions, 8 deletions

diff --git a/test/tile.cxx b/test/tile.cxx
index 2b6485ef2..e8b1d6318 100644
--- a/test/tile.cxx
+++ b/test/tile.cxx
@@ -1,7 +1,7 @@
 //
 // Fl_Tile test program for the Fast Light Tool Kit (FLTK).
 //
-// Copyright 1998-2016 by Bill Spitzak and others.
+// Copyright 1998-2023 by Bill Spitzak and others.
 //
 // This library is free software. Distribution and use rights are outlined in
 // the file "COPYING" which should have been included with this file.  If this
@@ -19,18 +19,19 @@
 #include <FL/Fl_Tile.H>
 #include <FL/Fl_Box.H>
 
-//#define TEST_INACTIVE
+// #define TEST_INACTIVE
 
 int main(int argc, char** argv) {
-  Fl_Double_Window window(300,300);
+  Fl_Double_Window window(300, 300);
   window.box(FL_NO_BOX);
   window.resizable(window);
 
-  int dx = 20, dy = dx; // border width of resizable() - see below
-  Fl_Tile tile(0,0,300,300);
+  Fl_Tile tile(0, 0, 300, 300);
 
   // create the symmetrical resize box with dx and dy pixels distance, resp.
   // from the borders of the Fl_Tile widget before all other children
+
+  int dx = 20, dy = dx; // border width of resizable()
   Fl_Box r(tile.x()+dx,tile.y()+dy,tile.w()-2*dx,tile.h()-2*dy);
   tile.resizable(r);
 
@@ -62,9 +63,9 @@ int main(int argc, char** argv) {
   box2b.color(13);
   box2b.labelsize(36);
   box2b.align(FL_ALIGN_CLIP);
-  //tile2.end();
+  // tile2.end();
 
-  //Fl_Tile tile3(150,150,150,150);
+  // Fl_Tile tile3(150,150,150,150);
   Fl_Box box3a(150,150,150,70,"3a");
   box3a.box(FL_DOWN_BOX);
   box3a.color(12);
@@ -76,7 +77,7 @@ int main(int argc, char** argv) {
   box3b.color(13);
   box3b.labelsize(36);
   box3b.align(FL_ALIGN_CLIP);
-  //tile3.end();
+  // tile3.end();
 
   tile.end();
   window.end();