Add an simple example application to open/save files using the FNFC.

git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3@8096 ea41ed52-d2ee-0310-a9c1-e6b18d33e121

1 files changed, 144 insertions, 0 deletions

diff --git a/examples/nativefilechooser-simple-app.cxx b/examples/nativefilechooser-simple-app.cxx
new file mode 100644
index 000000000..0f1eb01dd
--- /dev/null
+++ b/examples/nativefilechooser-simple-app.cxx
@@ -0,0 +1,144 @@
+//
+// "$Id$"
+//
+//	An example of how to use Fl_Native_File_Chooser to open & save files.
+//
+// Copyright 2010 Greg Ercolano.
+// 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>	// printf
+#include <stdlib.h>	// exit,malloc
+#include <string.h>	// strerror
+#include <errno.h>	// errno
+#include <FL/Fl.H>
+#include <FL/Fl_Window.H>
+#include <FL/Fl_Menu_Bar.H>
+#include <FL/Fl_Native_File_Chooser.H>
+#include <FL/fl_ask.H>
+
+class Application : public Fl_Window {
+  Fl_Native_File_Chooser *fc;
+  // Does file exist?
+  int exist(const char *filename) {
+    FILE *fp = fopen(filename, "r");
+    if (fp) { fclose(fp); return(1); }
+    else    { return(0); }
+  }
+  // 'Open' the file
+  void open(const char *filename) {
+    printf("Open '%s'\n", filename);
+  }
+  // 'Save' the file
+  //    Create the file if it doesn't exist
+  //    and save something in it.
+  //
+  void save(const char *filename) {
+    printf("Saving '%s'\n", filename);
+    if ( !exist(filename) ) {
+      FILE *fp = fopen(filename, "w");				// create file if it doesn't exist
+      if ( fp ) {
+        fprintf(fp, "Hello world.\n");
+        fclose(fp);
+      } else {
+        fl_message("Error: %s: %s", filename, strerror(errno));
+      }
+    }
+  }
+  // Handle an 'Open' request from the menu
+  static void open_cb(Fl_Widget *w, void *v) {
+    Application *app = (Application*)v;
+    app->fc->title("Open");
+    app->fc->type(Fl_Native_File_Chooser::BROWSE_FILE);		// only picks files that exist
+    switch ( app->fc->show() ) {
+      case -1: break;	// Error
+      case  1: break; 	// Cancel
+      default:		// Choice
+        app->fc->preset_file(app->fc->filename());
+        app->open(app->fc->filename());
+	break;
+    }
+  }
+  // Handle a 'Save as' request from the menu
+  static void saveas_cb(Fl_Widget *w, void *v) {
+    Application *app = (Application*)v;
+    app->fc->title("Save As");
+    app->fc->type(Fl_Native_File_Chooser::BROWSE_SAVE_FILE);	// need this if file doesn't exist yet
+    switch ( app->fc->show() ) {
+      case -1: break;	// Error
+      case  1: break; 	// Cancel
+      default:		// Choice
+        app->fc->preset_file(app->fc->filename());
+        app->save(app->fc->filename());
+	break;
+    }
+  }
+  // Handle a 'Save' request from the menu
+  static void save_cb(Fl_Widget *w, void *v) {
+    Application *app = (Application*)v;
+    if ( strlen(app->fc->filename()) == 0 ) {
+      saveas_cb(w,v);
+    } else {
+      app->save(app->fc->filename());
+    }
+  }
+  static void quit_cb(Fl_Widget *w, void *v) {
+    exit(0);
+  }
+  // Return an 'untitled' default pathname
+  const char* untitled_default() {
+    static char *filename = 0;
+    if ( !filename ) {
+      const char *home =
+        getenv("HOME") ? getenv("HOME") :		 // unix
+	getenv("HOME_PATH") ? getenv("HOME_PATH") :	 // windows
+	".";						 // other
+      filename = (char*)malloc(strlen(home)+20);
+      sprintf(filename, "%s/untitled.txt", home);
+    }
+    return(filename);
+  }
+public:
+  // CTOR
+  Application() : Fl_Window(400,200,"Native File Chooser Example") {
+    Fl_Menu_Bar *menu = new Fl_Menu_Bar(0,0,400,25);
+    menu->add("&File/&Open",  "^o", open_cb, (void*)this);
+    menu->add("&File/&Save",  "^s", save_cb, (void*)this);
+    menu->add("&File/&Save As", 0,  saveas_cb, (void*)this);
+    menu->add("&File/&Quit",  "^q", quit_cb);
+    // Initialize the file chooser
+    fc = new Fl_Native_File_Chooser();
+    fc->filter("Text\t*.txt\n");
+    fc->preset_file(untitled_default());
+    end();
+  }
+};
+
+int main(int argc, char *argv[]) {
+  Fl::scheme("gtk+");
+  Application *app = new Application();
+  app->show(argc,argv);
+  return(Fl::run());
+}
+
+//
+// End of "$Id$".
+//