FLUID: Adds template for tutorial.

Tutorial still to be written.
Also adds convenience methods to Fl_Input_
for getting and setting numeric values.

FL/Fl_Input_.H

@@ -238,6 +238,12 @@ public:
   /* Changes the widget text. */
   int value(const char*, int);
 
+  /* Changes the widget text. */
+  int value(int value);
+
+  /* Changes the widget text. */
+  int value(double value);
+
   /* Changes the widget text. */
   int static_value(const char*);
 
@@ -256,6 +262,10 @@ public:
   */
   const char* value() const {return value_;}
 
+  int ivalue() const;
+
+  int dvalue() const;
+
   /* Returns the Unicode character at index \p i. */
   unsigned int index(int i) const;
 

fluid/template_panel.cxx

@@ -140,9 +140,9 @@ Fl_Double_Window* make_template_panel() {
       template_browser->align(Fl_Align(FL_ALIGN_TOP_LEFT));
       template_browser->when(FL_WHEN_CHANGED | FL_WHEN_NOT_CHANGED);
     } // Fl_Browser* template_browser
-    { template_preview = new Fl_Box(200, 28, 250, 250);
+    { template_preview = new Fl_Box(200, 28, 250, 250, "no preview...");
       template_preview->box(FL_THIN_DOWN_BOX);
-      template_preview->align(Fl_Align(69|FL_ALIGN_INSIDE));
+      template_preview->align(Fl_Align(FL_ALIGN_CLIP|FL_ALIGN_INSIDE));
       Fl_Group::current()->resizable(template_preview);
     } // Fl_Box* template_preview
     { template_name = new Fl_Input(198, 288, 252, 25, "Template Name:");
@@ -221,7 +221,7 @@ void template_load() {
   int sample_templates_generated = 0;
   fluid_prefs.get("sample_templates_generated", sample_templates_generated, 0);
 
-  if (!sample_templates_generated) {
+  if (sample_templates_generated < 2) {
     strcpy(filename, path);
     strcat(filename, "/FLTK_License.fl");
     FILE *f = fopen(filename, "wb");
@@ -237,7 +237,23 @@ void template_load() {
   "er\n}\n", f);
       fclose(f);
     }
-    sample_templates_generated = 1;
+    strcpy(filename, path);
+    strcat(filename, "/1of7GUIs.fl");
+    f = fopen(filename, "wb");
+    if (f) {
+      fputs(
+  "# data file for the Fltk User Interface Designer (fluid)\n version 1.0400\n header_name {.h}\n"
+  "code_name {.cxx}\n comment {\n1 of 7GUIs\n\n7GUIs was been created as a spin-off of the master’s\n"
+  "thesis Comparison of Object-Oriented and Functional\nProgramming for GUI Development by Eugen Kiss at the\n"
+  "Human-Computer Interaction group of the Leibniz\nUniversität Hannover in 2014.\n\n"
+  "https://7guis.github.io/7guis/\n} {selected in_source not_in_header\n}\n\nFunction {} {open\n"
+  "} {\nFl_Window {} {\nlabel Counter open\nxywh {486 292 194 55} type Double resizable visible\n"
+  "} {\nFl_Output counter_widget {\nxywh {15 15 80 22}\ncode0 {counter_widget->value(0);}\n"
+  "}\nFl_Button {} {\nlabel Count\ncallback {int i = counter_widget->ivalue();\ni++;\n"
+  "counter_widget->value(i);}\nxywh {99 15 80 22}\n}\n}\n}\n", f);
+      fclose(f);
+    }  
+    sample_templates_generated = 2;
     fluid_prefs.set("sample_templates_generated", sample_templates_generated);
     fluid_prefs.flush();
   }

fluid/template_panel.fl

@@ -68,7 +68,7 @@ template_preview->image(0);
 template_browser->deselect();
 template_name->value("");
 template_instance->value("");
-template_panel->hide();}
+template_panel->hide();} open
     xywh {478 284 460 355} type Double resizable modal visible
   } {
     Fl_Browser template_browser {
@@ -120,7 +120,8 @@ if (img) {
       xywh {10 28 180 250} type Hold labelfont 1 align 5 when 3
     }
     Fl_Box template_preview {
-      xywh {200 28 250 250} box THIN_DOWN_BOX align 85 resizable
+      label {no preview...} selected
+      xywh {200 28 250 250} box THIN_DOWN_BOX align 80 resizable
     }
     Fl_Input template_name {
       label {Template Name:}
@@ -134,7 +135,7 @@ if (img) {
       label {Instance Name:}
       xywh {198 288 252 25} labelfont 1 textfont 4 hide
     }
-    Fl_Group {} {
+    Fl_Group {} {open
       xywh {10 323 440 25}
     } {
       Fl_Button template_delete {
@@ -217,7 +218,7 @@ strlcat(path, "templates", sizeof(path));
 int sample_templates_generated = 0;
 fluid_prefs.get("sample_templates_generated", sample_templates_generated, 0);
 
-if (!sample_templates_generated) {
+if (sample_templates_generated < 2) {
   strcpy(filename, path);
   strcat(filename, "/FLTK_License.fl");
   FILE *f = fopen(filename, "wb");
@@ -233,7 +234,23 @@ if (!sample_templates_generated) {
 "er\\n}\\n", f);
     fclose(f);
   }
-  sample_templates_generated = 1;
+  strcpy(filename, path);
+  strcat(filename, "/1of7GUIs.fl");
+  f = fopen(filename, "wb");
+  if (f) {
+    fputs(
+"\# data file for the Fltk User Interface Designer (fluid)\\n version 1.0400\\n header_name {.h}\\n"
+"code_name {.cxx}\\n comment {\\n1 of 7GUIs\\n\\n7GUIs was been created as a spin-off of the master’s\\n"
+"thesis Comparison of Object-Oriented and Functional\\nProgramming for GUI Development by Eugen Kiss at the\\n"
+"Human-Computer Interaction group of the Leibniz\\nUniversität Hannover in 2014.\\n\\n"
+"https://7guis.github.io/7guis/\\n} {selected in_source not_in_header\\n}\\n\\nFunction {} {open\\n"
+"} {\\nFl_Window {} {\\nlabel Counter open\\nxywh {486 292 194 55} type Double resizable visible\\n"
+"} {\\nFl_Output counter_widget {\\nxywh {15 15 80 22}\\ncode0 {counter_widget->value(0);}\\n"
+"}\\nFl_Button {} {\\nlabel Count\\ncallback {int i = counter_widget->ivalue();\\ni++;\\n"
+"counter_widget->value(i);}\\nxywh {99 15 80 22}\\n}\\n}\\n}\\n", f);
+    fclose(f);
+  }  
+  sample_templates_generated = 2;
   fluid_prefs.set("sample_templates_generated", sample_templates_generated);
   fluid_prefs.flush();
 }
@@ -259,6 +276,5 @@ for (i = 0; i < num_files; i ++) {
   free(files[i]);
 }
 
-if (num_files > 0) free(files);} {selected
+if (num_files > 0) free(files);} {}
-  }
 }

fluid/widget_panel.cxx

@@ -573,7 +573,6 @@ Fl_Double_Window* make_widget_panel() {
         o->labelsize(11);
         o->callback((Fl_Callback*)propagate_load);
         o->when(FL_WHEN_NEVER);
-        o->hide();
         { Fl_Group* o = new Fl_Group(95, 40, 309, 20, "Label:");
           o->labelfont(1);
           o->labelsize(11);
@@ -1667,6 +1666,7 @@ access the Widget pointer and \'v\' to access the user value.");
       { widget_tab_grid = new Fl_Group(10, 30, 400, 330, "Grid");
         widget_tab_grid->labelsize(11);
         widget_tab_grid->callback((Fl_Callback*)propagate_load);
+        widget_tab_grid->hide();
         { Fl_Group* o = new Fl_Group(95, 60, 315, 20, "Grid Layout:");
           o->labelfont(1);
           o->labelsize(11);

fluid/widget_panel.fl

@@ -44,7 +44,7 @@ decl {extern void set_modflag(int mf, int mfc=-1);} {private local
 }
 
 Function {make_widget_panel()} {
-  comment {Create a panel that can be used with all known widgets} open selected
+  comment {Create a panel that can be used with all known widgets} open
 } {
   Fl_Window {} {
     comment {Use a Double Window to avoid flickering.} open
@@ -58,8 +58,8 @@ Function {make_widget_panel()} {
     } {
       Fl_Group {} {
         label GUI
-        callback propagate_load
+        callback propagate_load selected
-        xywh {10 30 400 330} labelsize 11 when 0 hide resizable
+        xywh {10 30 400 330} labelsize 11 when 0 resizable
       } {
         Fl_Group {} {
           label {Label:}
@@ -1053,7 +1053,7 @@ wCallback->do_callback(wCallback, v);} open
       Fl_Group widget_tab_grid {
         label Grid
         callback propagate_load open
-        xywh {10 30 400 330} labelsize 11
+        xywh {10 30 400 330} labelsize 11 hide
       } {
         Fl_Group {} {
           label {Grid Layout:}

src/Fl_Input_.cxx

@@ -1462,6 +1462,54 @@ int Fl_Input_::value(const char* str) {
   return value(str, str ? (int) strlen(str) : 0);
 }
 
+/**
+ Changes the widget text to a signed integer number.
+
+ \param [in] v the new value
+ \return non-zero if the new value is different than the current one
+ \see Fl_Input_::value(const char* str), Fl_Input_::ivalue()
+ */
+int Fl_Input_::value(int v) {
+  char buf[64];
+  snprintf(buf, sizeof(buf)-1, "%d", v);
+  return value(buf);
+}
+
+/**
+ Changes the widget text to a floating point number ("%g").
+
+ \param [in] v the new value
+ \return non-zero if the new value is different than the current one
+ \see Fl_Input_::value(const char* str), Fl_Input_::ivalue()
+ */
+int Fl_Input_::value(double v) {
+  char buf[64];
+  snprintf(buf, sizeof(buf)-1, "%g", v);
+  return value(buf);
+}
+
+/**
+ Returns the widget text interpreted as a signed integer.
+
+ \return signed integer value
+ \see Fl_Input_::dvalue()
+ \see Fl_Input_::value(int)
+ */
+int Fl_Input_::ivalue() const {
+  return atoi(value());
+}
+
+/**
+ Returns the widget text interpreted as a floating point number.
+
+ \return double precision floating point value
+ \see Fl_Input_::ivalue()
+ \see Fl_Input_::value(double)
+ */
+int Fl_Input_::dvalue() const {
+  return atof(value());
+}
+
 /**
   Changes the size of the widget.
   This call updates the text layout so that the cursor is visible.