Added examples directory

git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3@7628 ea41ed52-d2ee-0310-a9c1-e6b18d33e121

examples/Makefile

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+include ../makeinclude
+
+ALL = tabs-simple$(EXEEXT) \
+      tree-simple$(EXEEXT)
+
+# default target -- build everything
+default: $(ALL)
+
+tabs-simple$(EXEEXT): tabs-simple.cxx
+	fltk-config --compile tabs-simple.cxx
+
+tree-simple$(EXEEXT): tree-simple.cxx
+	fltk-config --compile tree-simple.cxx
+
+# clean everything
+clean:
+	$(RM) $(ALL)
+	$(RM) *.o
+	$(RM) core

examples/README.examples

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+FLTK EXAMPLE PROGRAMS
+---------------------
+
+    This directory contains example FLTK programs that demonstrate
+    recommended programming practices and techniques for FLTK application
+    programmers. The "*-simple.cxx" files are a good starting point for
+    those new to FLTK.
+
+    The programs in this directory are NOT built automatically 
+    when you build FLTK; you have to manually build them.
+
+    The goals of these example programs:
+
+      o Show good programming style for app programmers to emulate
+
+      o Show simple examples of how to use widgets to new users of FLTK.
+
+      o Show intermediate or advanced examples that show particular
+        techniques often misused or hard to document
+
+      o Demonstrate code that are FAQs on the newsgroup forum.
+	(such as how to use threads, callbacks, etc)
+
+      o Example code should be short, but not at the expense of clarity.
+
+      o Where possible, examples should emphasize FLTK's simplicity.
+
+
+NEW SUBMISSIONS: RECOMMENDED PRACTICES
+
+    These programs must follow FLTK coding style as defined in the FLTK
+    "CMP" (Configuration Management Plan/Coding Standards).
+
+    Example code should demonstrate recommended techniques the FLTK
+    developers think application programmers should use in their own
+    applications.
+
+    The best examples are those that are as short and clear as possible;
+    terse, but not at the expense of clarity.
+
+    To avoid cluttering up the top level directory with ancillary files
+    (such as image files or icons), examples that depend on more than
+    just a .cxx/.h file pair should have their own subdirectory.
+
+    Data files common to several examples should be located in the
+    examples/data directory. 
+    
+    Ancillary data files should be as small as possible, to keep the 
+    distribution tar files small. Avoid high resolution images or
+    uncompressed images when possible. 
+    
+    Examples that need very large data sets should not be part of the
+    FLTK distribution; they can be provided as separate packages
+    (eg. as articles or external links).
+
+    Some widgets have multiple common uses that are best demonstrated
+    separately. For instance, the table widget can be used as a 
+    custom data table, or as a spreadsheet, or as a widget container.
+    So separate examples for each would be e.g. "table-custom-data.cxx",
+    "table-spreadsheet.cxx", "table-widget-container.cxx", etc.
+
+    Example programs should contain comments that help understand the
+    concepts shown, but not so verbose as to dwarf the code or make
+    the code hard to read. Within code, it's best to use single line
+    comments to emphasize code that might be unclear. Let the code
+    speak as much as possible.
+
+    Examples programs may be referred to from the documentation
+    as good examples on how to do particular programming techniques.
+
+
+NAMING CONVENTIONS
+
+    Example programs that demonstrate a particular widget should start
+    with that widget's name in lowercase, eg. "table.cxx" for Fl_Table.
+
+    Demonstrations of a particular technique should start with
+    "howto-xxx.cxx" to avoid naming conflicts with future widgets 
+    of the same name.
+
+      xxx-simple.cxx          -- Simplest possible example of widget xxx
+                                 eg. table-simple.cxx
+
+      xxx-<technique>.cxx     -- A particular "technique" using widget xxx
+                                 eg. "table-spreadsheet.cxx"
+
+      howto-<technique>.cxx   -- Demonstrate a particular technique, eg. "howto-threading.cxx"
+
+    Some example programs may depend on multiple files. To avoid
+    cluttering up the top level examples directory, such examples will
+    have their own subdirectory with the files they depend on localized
+    to that directory.
+
+    Example programs should be as small as possible, to keep the
+    distribution tar files small.
+
+    Very large examples, or examples that depend on large data sets
+    should be submitted as separate articles on the FLTK site, or as
+    external links on the FLTK site's 'links' page.
+
+
+HISTORY
+
+    Previous to FLTK 1.3.0, the fltk/test directory served the dual
+    purpose of containing test suites as well as example code.
+
+    But the fltk/test programs started becoming necessarily complex,
+    testing for obscure problems, and not necessarily good demos for
+    applications programmers.
+
+    The fltk/examples directory was created in FLTK 1.3.0 to separate
+    'good programming examples' from the test suite code. 
+

examples/tabs-simple.cxx

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+//
+// "$Id$"
+//
+// Simple Fl_Tabs widget example. 
+// Originally from erco's cheat sheet 06/05/2010, permission by author.
+//
+// Copyright 1998-2010 by Bill Spitzak and others.
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Library General Public
+// License as published by the Free Software Foundation; either
+// version 2 of the License, or (at your option) any later version.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Library General Public License for more details.
+//
+// You should have received a copy of the GNU Library General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+// USA.
+//
+// Please report all bugs and problems on the following page:
+//
+//     http://www.fltk.org/str.php
+//
+#include <FL/Fl.H>
+#include <FL/Fl_Window.H>
+#include <FL/Fl_Tabs.H>
+#include <FL/Fl_Group.H>
+#include <FL/Fl_Button.H>
+//
+// Simple tabs example
+//      _____  _____
+//   __/ Aaa \/ Bbb \______________________
+//  |    _______                           |
+//  |   |_______|                          |
+//  |    _______                           |
+//  |   |_______|                          |
+//  |    _______                           |
+//  |   |_______|                          |
+//  |______________________________________|
+//
+int main(int argc, char *argv[]) {
+  Fl::scheme("gtk+");
+  Fl_Window *win = new Fl_Window(500,200,"Tabs Example");
+  {
+    // Create the tab widget
+    Fl_Tabs *tabs = new Fl_Tabs(10,10,500-20,200-20);
+    {
+      // ADD THE "Aaa" TAB
+      //   We do this by adding a child group to the tab widget.
+      //   The child group's label defined the label of the tab.
+      //
+      Fl_Group *aaa = new Fl_Group(10,35,500-20,200-45,"Aaa");
+      {
+	// Put some different buttons into the group, which will be shown
+	// when the tab is selected.
+	Fl_Button *b1 = new Fl_Button(50, 60,90,25,"Button A1"); b1->color(88+1);
+	Fl_Button *b2 = new Fl_Button(50, 90,90,25,"Button A2"); b2->color(88+2);
+	Fl_Button *b3 = new Fl_Button(50,120,90,25,"Button A3"); b3->color(88+3);
+      }
+      aaa->end();
+
+      // ADD THE "Bbb" TAB
+      //   Same details as above.
+      //
+      Fl_Group *bbb = new Fl_Group(10,35,500-10,200-35,"Bbb");
+      {
+	// Put some different buttons into the group, which will be shown
+	// when the tab is selected.
+	Fl_Button *b1 = new Fl_Button( 50,60,90,25,"Button B1"); b1->color(88+1);
+	Fl_Button *b2 = new Fl_Button(150,60,90,25,"Button B2"); b2->color(88+3);
+	Fl_Button *b3 = new Fl_Button(250,60,90,25,"Button B3"); b3->color(88+5);
+	Fl_Button *b4 = new Fl_Button( 50,90,90,25,"Button B4"); b4->color(88+2);
+	Fl_Button *b5 = new Fl_Button(150,90,90,25,"Button B5"); b5->color(88+4);
+	Fl_Button *b6 = new Fl_Button(250,90,90,25,"Button B6"); b6->color(88+6);
+      }
+      bbb->end();
+    }
+    tabs->end();
+  }
+  win->end();
+  win->show(argc, argv);
+  return(Fl::run());
+}

examples/tree-simple.cxx

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+//
+// "$Id$"
+//
+// Simple Fl_Tree widget example. - erco 06/05/2010
+//
+// Copyright 1998-2010 by Bill Spitzak and others.
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Library General Public
+// License as published by the Free Software Foundation; either
+// version 2 of the License, or (at your option) any later version.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Library General Public License for more details.
+//
+// You should have received a copy of the GNU Library General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+// USA.
+//
+// Please report all bugs and problems on the following page:
+//
+//     http://www.fltk.org/str.php
+//
+#include <stdio.h>
+#include <FL/Fl.H>
+#include <FL/Fl_Double_Window.H>
+#include <FL/Fl_Tree.H>
+
+// Tree's callback
+//    Invoked whenever someone clicks an item.
+//
+void TreeCallback(Fl_Widget *w, void *data) {
+  Fl_Tree      *tree = (Fl_Tree*)w;
+  Fl_Tree_Item *item = (Fl_Tree_Item*)tree->item_clicked();
+  fprintf(stderr, "TreeCallback: item clicked='%s'\n", (item)?item->label():"???");
+}
+
+int main(int argc, char *argv[]) {
+  Fl::scheme("gtk+");
+  Fl_Double_Window *win = new Fl_Double_Window(250, 400, "Simple Tree");
+  win->begin();
+  {
+    // Create the tree
+    Fl_Tree *tree = new Fl_Tree(10, 10, win->w()-20, win->h()-20);
+    tree->showroot(0);				// don't show root of tree
+    tree->callback(TreeCallback);		// setup a callback for the tree
+
+    // Add some items
+    tree->add("Flintstones/Fred");
+    tree->add("Flintstones/Wilma");
+    tree->add("Flintstones/Pebbles");
+    tree->add("Simpsons/Homer");
+    tree->add("Simpsons/Marge");
+    tree->add("Simpsons/Bart");
+    tree->add("Simpsons/Lisa");
+
+    // Start with one of the items closed
+    tree->close("Simpsons");
+  }
+  win->end();
+  win->resizable(win);
+  win->show(argc, argv);
+  return(Fl::run());
+}
+
+//
+// End of "$Id$".
+//

examples/wizard-simple.cxx

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+//
+// "$Id$"
+//
+// Simple Fl_Wizard widget example. 
+// Originally from erco's cheat sheet 06/05/2010, permission by author.
+//
+// Copyright 1998-2010 by Bill Spitzak and others.
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Library General Public
+// License as published by the Free Software Foundation; either
+// version 2 of the License, or (at your option) any later version.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Library General Public License for more details.
+//
+// You should have received a copy of the GNU Library General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+// USA.
+//
+// Please report all bugs and problems on the following page:
+//
+//     http://www.fltk.org/str.php
+//
+#include <stdlib.h>
+#include <FL/Fl.H>
+#include <FL/Fl_Window.H>
+#include <FL/Fl_Group.H>
+#include <FL/Fl_Wizard.H>
+#include <FL/Fl_Button.H>
+#include <FL/Fl_Multiline_Output.H>
+//
+// Simple 'wizard' using fltk's new Fl_Wizard widget
+//
+Fl_Window *G_win = 0;
+Fl_Wizard *G_wiz = 0;
+
+void back_cb(Fl_Widget*,void*) { G_wiz->prev(); }
+void next_cb(Fl_Widget*,void*) { G_wiz->next(); }
+void done_cb(Fl_Widget*,void*) { exit(0); }
+
+int main(int argc, char **argv) {
+    G_win = new Fl_Window(400,300,"Example Wizard");
+    G_wiz = new Fl_Wizard(0,0,400,300);
+
+    // Wizard: page 1
+    {
+        Fl_Group *g = new Fl_Group(0,0,400,300);
+        Fl_Button *next = new Fl_Button(290,265,100,25,"Next"); next->callback(next_cb);
+        Fl_Multiline_Output *out = new Fl_Multiline_Output(10,30,400-20,300-80,"Welcome");
+        out->labelsize(20);
+        out->align(FL_ALIGN_TOP|FL_ALIGN_LEFT);
+        out->value("This is First page");
+        g->end();
+    }
+    // Wizard: page 2
+    {
+        Fl_Group *g = new Fl_Group(0,0,400,300);
+        Fl_Button *next = new Fl_Button(290,265,100,25,"Next"); next->callback(next_cb);
+        Fl_Button *back = new Fl_Button(180,265,100,25,"Back"); back->callback(back_cb);
+        Fl_Multiline_Output *out = new Fl_Multiline_Output(10,30,400-20,300-80,"Terms And Conditions");
+        out->labelsize(20);
+        out->align(FL_ALIGN_TOP|FL_ALIGN_LEFT);
+        out->value("This is the Second page");
+        g->end();
+    }
+    // Wizard: page 3
+    {
+        Fl_Group *g = new Fl_Group(0,0,400,300);
+        Fl_Button *done = new Fl_Button(290,265,100,25,"Finish"); done->callback(done_cb);
+        Fl_Button *back = new Fl_Button(180,265,100,25,"Back"); back->callback(back_cb);
+        Fl_Multiline_Output *out = new Fl_Multiline_Output(10,30,400-20,300-80,"Finish");
+        out->labelsize(20);
+        out->align(FL_ALIGN_TOP|FL_ALIGN_LEFT);
+        out->value("This is the Last page");
+        g->end();
+    }
+    G_wiz->end();
+    G_win->end();
+    G_win->show(argc, argv);
+    return Fl::run();
+}