Add option to test Fl_Flex in test/pack.cxx

This new feature demonstrates that Fl_Flex can be used (almost) as
a drop-in replacement of Fl_Pack.

Add missing file to examples/.gitignore.

1 files changed, 105 insertions, 68 deletions

diff --git a/test/pack.cxx b/test/pack.cxx
index 87fc49e08..64398ddab 100644
--- a/test/pack.cxx
+++ b/test/pack.cxx
@@ -1,11 +1,11 @@
 //
-// Fl_Pack test program for the Fast Light Tool Kit (FLTK).
+// Fl_Pack or Fl_Flex test program for the Fast Light Tool Kit (FLTK).
 //
-// Rather crude test of the Fl_Pack object.
+// Rather crude test of the Fl_Pack or Fl_Flex class.
 // Changing the type() of an Fl_Pack after it is displayed is not supported
 // so I have to do a lot of resizing of things before that.
 //
-// Copyright 1998-2010 by Bill Spitzak and others.
+// Copyright 1998-2022 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
@@ -25,81 +25,118 @@
 #include <FL/Fl_Scroll.H>
 #include <FL/Fl_Value_Slider.H>
 #include <FL/Fl_Pack.H>
+#include <FL/Fl_Flex.H>
 
-Fl_Pack *pack;
+// This test program can be modified by two #define's below to test Fl_Flex
+// as a drop-in replacement of Fl_Pack. The committed code should always use
+// the default settings documented below.
+//
+// Edit the following 2 #define's to modify the test scenario:
+
+#define USE_FLEX   0 // default 0 = use Fl_Pack, 1 = use Fl_Flex
+#define USE_SCROLL 1 // default 1 = put Fl_Pack or Fl_Flex inside Fl_Scroll
+
+// Do not edit #define's below
+
+#if USE_FLEX
+#define CONTAINER Fl_Flex
+#define USE_PACK 0
+#else
+#define CONTAINER Fl_Pack
+#define USE_PACK 1
+#endif
+
+CONTAINER *pack; // either Fl_Pack or Fl_Flex
+
+#if USE_SCROLL
 Fl_Scroll *scroll;
+#endif
 
-void type_cb(Fl_Light_Button*, long v) {
+void type_cb(Fl_Light_Button *, long v) {
   for (int i = 0; i < pack->children(); i++) {
-    Fl_Widget* o = pack->child(i);
-    o->resize(0,0,25,25);
+    Fl_Widget *o = pack->child(i);
+    o->resize(0, 0, 25, 25);
   }
-  pack->resize(scroll->x(),scroll->y(),scroll->w(),scroll->h());
-  pack->parent()->redraw();
   pack->type(uchar(v));
+
+#if USE_SCROLL
+  pack->resize(scroll->x(), scroll->y(), scroll->w(), scroll->h());
+#endif
+
+#if USE_FLEX
+  pack->layout();
+#else
+  pack->parent()->redraw();
   pack->redraw();
+#endif
 }
 
-void spacing_cb(Fl_Value_Slider*o, long) {
-  pack->spacing(int(o->value()));
-  scroll->redraw();
+void spacing_cb(Fl_Value_Slider *o, long) {
+  int s = int(o->value());
+  pack->spacing(s);
+#if USE_FLEX
+  if (s > 4)
+    pack->margin(4);
+  else
+    pack->margin(s);
+  pack->layout();
+#else
+  pack->parent()->redraw();
+#endif
 }
 
 int main(int argc, char **argv) {
- Fl_Double_Window *w;
- {Fl_Double_Window* o = new Fl_Double_Window(360, 370);
-  w = o;
-  scroll = new Fl_Scroll(10,10,340,285);
- {Fl_Pack* o = new Fl_Pack(10, 10, 340, 285);
-  pack = o;
-  o->box(FL_DOWN_FRAME);
-  //o->box(FL_ENGRAVED_FRAME);
- new Fl_Button(35, 35, 25, 25, "b1");
- new Fl_Button(45, 45, 25, 25, "b2");
- new Fl_Button(55, 55, 25, 25, "b3");
- new Fl_Button(65, 65, 25, 25, "b4");
- new Fl_Button(75, 75, 25, 25, "b5");
- new Fl_Button(85, 85, 25, 25, "b6");
- new Fl_Button(95, 95, 25, 25, "b7");
- new Fl_Button(105, 105, 25, 25, "b8");
- new Fl_Button(115, 115, 25, 25, "b9");
- new Fl_Button(125, 125, 25, 25, "b10");
- new Fl_Button(135, 135, 25, 25, "b11");
- new Fl_Button(145, 145, 25, 25, "b12");
- new Fl_Button(155, 155, 25, 25, "b13");
- new Fl_Button(165, 165, 25, 25, "b14");
- new Fl_Button(175, 175, 25, 25, "b15");
- new Fl_Button(185, 185, 25, 25, "b16");
- new Fl_Button(195, 195, 25, 25, "b17");
- new Fl_Button(205, 205, 25, 25, "b18");
- new Fl_Button(215, 215, 25, 25, "b19");
- new Fl_Button(225, 225, 25, 25, "b20");
- new Fl_Button(235, 235, 25, 25, "b21");
- new Fl_Button(245, 245, 25, 25, "b22");
- new Fl_Button(255, 255, 25, 25, "b23");
- new Fl_Button(265, 265, 25, 25, "b24");
-  o->end();
-  w->resizable(o);
- }
- scroll->end();
- {Fl_Light_Button* o = new Fl_Light_Button(10, 305, 165, 25, "HORIZONTAL");
- o->type(FL_RADIO_BUTTON);
-  o->callback((Fl_Callback*)type_cb, (void*)(Fl_Pack::HORIZONTAL));
- }
- {Fl_Light_Button* o = new Fl_Light_Button(185, 305, 165, 25, "VERTICAL");
- o->type(FL_RADIO_BUTTON);
- o->value(1);
-  o->callback((Fl_Callback*)type_cb, (void*)(Fl_Pack::VERTICAL));
- }
- {Fl_Value_Slider* o = new Fl_Value_Slider(100, 335, 250, 25, "Spacing: ");
- o->align(FL_ALIGN_LEFT);
- o->type(FL_HORIZONTAL);
- o->range(0,30);
- o->step(1);
- o->callback((Fl_Callback*)spacing_cb);
- }
- w->end();
- }
- w->show(argc, argv);
- return Fl::run();
+  Fl_Double_Window *w = new Fl_Double_Window(360, 370);
+#if USE_SCROLL
+  scroll = new Fl_Scroll(10, 10, 340, 285);
+#endif
+
+  int nbuttons = 24;
+  pack = new CONTAINER(10, 10, 340, 285);
+#if (USE_FLEX)
+  pack->box(FL_DOWN_BOX);
+  nbuttons = 12;
+#else
+  pack->box(FL_DOWN_FRAME);
+#endif
+
+  // create buttons: position (xx, xx) will be "fixed" by Fl_Pack/Fl_Flex
+  int xx = 35;
+  for (int i = 0; i < nbuttons; i++) {
+    char ltxt[8];
+    sprintf(ltxt, "b%d", i + 1);
+    Fl_Button *b = new Fl_Button(xx, xx, 25, 25);
+    b->copy_label(ltxt);
+    xx += 10;
+  }
+
+  pack->end();
+  w->resizable(pack);
+
+#if USE_SCROLL
+  scroll->end();
+#endif
+  {
+    Fl_Light_Button *o = new Fl_Light_Button(10, 305, 165, 25, "HORIZONTAL");
+    o->type(FL_RADIO_BUTTON);
+    o->callback((Fl_Callback *)type_cb, (void *)(CONTAINER::HORIZONTAL));
+  }
+  {
+    Fl_Light_Button *o = new Fl_Light_Button(185, 305, 165, 25, "VERTICAL");
+    o->type(FL_RADIO_BUTTON);
+    o->value(1);
+    o->callback((Fl_Callback *)type_cb, (void *)(CONTAINER::VERTICAL));
+  }
+  {
+    Fl_Value_Slider *o = new Fl_Value_Slider(100, 335, 250, 25, "Spacing: ");
+    o->align(FL_ALIGN_LEFT);
+    o->type(FL_HORIZONTAL);
+    o->range(0, 30);
+    o->step(1);
+    o->callback((Fl_Callback *)spacing_cb);
+  }
+  w->end();
+  w->size_range(300, 300);
+  w->show(argc, argv);
+  return Fl::run();
 }