Fluid support for Fl_Flex (#523) and some Fl_Flex improvements

* Adding Fluid support for Fl_Flex, margins, and gap.

* Fluid Fl_Flex mostly working. Fixed in Fl_Flex::set_size().

* Fluid Flex live mode works, interactive dragging works

* Fluid Flex: adding check box for fixed children

* Fluid Flex: visual flexibility indicator in guides.

* Fluid Flex: bug in generated code.

* Fix formatting

* Fixing Tooltip, fixing resize issue PR #518.

* Removing unused variables.

Co-authored-by: Albrecht Schlosser <albrechts.fltk@online.de>

1 files changed, 60 insertions, 7 deletions

diff --git a/fluid/widget_panel.fl b/fluid/widget_panel.fl
index 1f0b3b2ad..de82b3871 100644
--- a/fluid/widget_panel.fl
+++ b/fluid/widget_panel.fl
@@ -23,7 +23,7 @@ comment {//
 decl {\#include "Fl_Widget_Type.h"} {private global
 }
 
-decl {\#include "Shortcut_Button.h"} {selected public global
+decl {\#include "Shortcut_Button.h"} {public global
 }
 
 Function {make_widget_panel()} {
@@ -31,8 +31,8 @@ Function {make_widget_panel()} {
 } {
   Fl_Window {} {
     comment {Use a Double Window to avoid flickering.} open
-    xywh {500 209 420 400} type Double labelsize 11 align 80 hide resizable hotspot
-    code0 {o->size_range(o->w(), o->h());} size_range {420 400 0 0}
+    xywh {500 209 420 400} type Double labelsize 11 align 80 resizable hotspot
+    code0 {o->size_range(o->w(), o->h());} size_range {420 400 0 0} visible
   } {
     Fl_Tabs {} {
       callback {propagate_load((Fl_Group *)o,v);} open
@@ -258,8 +258,8 @@ Use Ctrl-J for newlines.} xywh {95 40 190 20} labelfont 1 labelsize 11 when 1 te
         }
         Fl_Group {} {
           label {Position:}
-          callback propagate_load open
-          xywh {95 150 314 20} labelfont 1 labelsize 11 align 4
+          callback position_group_cb open
+          xywh {95 150 314 20} labelfont 1 labelsize 11 align 4 hide
         } {
           Fl_Input widget_x_input {
             label {X:}
@@ -295,8 +295,27 @@ Use Ctrl-J for newlines.} xywh {95 40 190 20} labelfont 1 labelsize 11 when 1 te
           }
         }
         Fl_Group {} {
+          label {Flex Parent:}
+          callback flex_size_group_cb open
+          xywh {95 150 314 20} labelfont 1 labelsize 11 align 4
+        } {
+          Fl_Value_Input widget_flex_size {
+            label {Size:}
+            callback flex_size_cb
+            tooltip {Fixed Width or Height for a horizontal or vertical Fl_Flex Parent.} xywh {95 150 55 20} labelsize 11 align 5 textsize 11
+          }
+          Fl_Check_Button widget_flex_fixed {
+            label fixed
+            callback flex_fixed_cb selected
+            tooltip {If checked, the size of the widget stays fixed.} xywh {155 150 55 20} down_box DOWN_BOX labelsize 11
+          }
+          Fl_Box {} {
+            xywh {398 150 1 20} resizable
+          }
+        }
+        Fl_Group {} {
           label {Values:}
-          callback propagate_load
+          callback values_group_cb open
           xywh {95 185 300 20} labelfont 1 labelsize 11 align 4
         } {
           Fl_Value_Input {} {
@@ -329,8 +348,42 @@ Use Ctrl-J for newlines.} xywh {95 40 190 20} labelfont 1 labelsize 11 when 1 te
           }
         }
         Fl_Group {} {
+          label {Margins:}
+          callback flex_margin_group_cb open
+          xywh {95 185 300 20} labelfont 1 labelsize 11 align 4 hide
+        } {
+          Fl_Value_Input {} {
+            label {Left:}
+            callback flex_margin_left_cb
+            tooltip {Left margin in group.} xywh {95 185 55 20} labelsize 11 align 5 textsize 11
+          }
+          Fl_Value_Input {} {
+            label {Top:}
+            callback flex_margin_top_cb
+            tooltip {Top margin in group.} xywh {155 185 55 20} labelsize 11 align 5 textsize 11
+          }
+          Fl_Value_Input {} {
+            label {Right:}
+            callback flex_margin_right_cb
+            tooltip {Right margin in group.} xywh {215 185 55 20} labelsize 11 align 5 textsize 11
+          }
+          Fl_Value_Input {} {
+            label {Bottom:}
+            callback flex_margin_bottom_cb
+            tooltip {Bottom margin in group.} xywh {275 185 55 20} labelsize 11 align 5 textsize 11
+          }
+          Fl_Value_Input {} {
+            label {Gap:}
+            callback flex_margin_gap_cb
+            tooltip {Gap between children.} xywh {335 185 55 20} labelsize 11 align 5 textsize 11
+          }
+          Fl_Box {} {
+            xywh {395 185 0 20} resizable
+          }
+        }
+        Fl_Group {} {
           label {Size Range:}
-          callback propagate_load
+          callback size_range_group_cb open
           xywh {95 185 300 20} labelfont 1 labelsize 11 align 4 hide
         } {
           Fl_Value_Input {} {