examples/nativefilechooser-simple-app.cxx

   1 //
   2 // "$Id: nativefilechooser-simple-app.cxx 8183 2011-01-04 17:31:56Z AlbrechtS $"
   3 //
   4 //      An example of how to use Fl_Native_File_Chooser to open & save files.
   5 //
   6 // Copyright 2010 Greg Ercolano.
   7 // Copyright 1998-2010 by Bill Spitzak and others.
   8 //
   9 // This library is free software; you can redistribute it and/or
  10 // modify it under the terms of the GNU Library General Public
  11 // License as published by the Free Software Foundation; either
  12 // version 2 of the License, or (at your option) any later version.
  13 //
  14 // This library is distributed in the hope that it will be useful,
  15 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17 // Library General Public License for more details.
  18 //
  19 // You should have received a copy of the GNU Library General Public
  20 // License along with this library; if not, write to the Free Software
  21 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  22 // USA.
  23 //
  24 // Please report all bugs and problems on the following page:
  25 //
  26 //     http://www.fltk.org/str.php
  27 //
  28 #include <stdio.h>      // printf
  29 #include <stdlib.h>     // exit,malloc
  30 #include <string.h>     // strerror
  31 #include <errno.h>      // errno
  32 #include <FL/Fl.H>
  33 #include <FL/Fl_Window.H>
  34 #include <FL/Fl_Menu_Bar.H>
  35 #include <FL/Fl_Native_File_Chooser.H>
  36 #include <FL/Fl_Box.H>
  37 #include <FL/fl_ask.H>
  38
  39 class Application : public Fl_Window {
  40   Fl_Native_File_Chooser *fc;
  41   // Does file exist?
  42   int exist(const char *filename) {
  43     FILE *fp = fopen(filename, "r");
  44     if (fp) { fclose(fp); return(1); }
  45     else    { return(0); }
  46   }
  47   // 'Open' the file
  48   void open(const char *filename) {
  49     printf("Open '%s'\n", filename);
  50   }
  51   // 'Save' the file
  52   //    Create the file if it doesn't exist
  53   //    and save something in it.
  54   //
  55   void save(const char *filename) {
  56     printf("Saving '%s'\n", filename);
  57     if ( !exist(filename) ) {
  58       FILE *fp = fopen(filename, "w");                          // create file if it doesn't exist
  59       if ( fp ) {
  60         // A real app would do something useful here.
  61         fprintf(fp, "Hello world.\n");
  62         fclose(fp);
  63       } else {
  64         fl_message("Error: %s: %s", filename, strerror(errno));
  65       }
  66     } else {
  67       // A real app would do something useful here.
  68     }
  69   }
  70   // Handle an 'Open' request from the menu
  71   static void open_cb(Fl_Widget *w, void *v) {
  72     Application *app = (Application*)v;
  73     app->fc->title("Open");
  74     app->fc->type(Fl_Native_File_Chooser::BROWSE_FILE);         // only picks files that exist
  75     switch ( app->fc->show() ) {
  76       case -1: break;   // Error
  77       case  1: break;   // Cancel
  78       default:          // Choice
  79         app->fc->preset_file(app->fc->filename());
  80         app->open(app->fc->filename());
  81         break;
  82     }
  83   }
  84   // Handle a 'Save as' request from the menu
  85   static void saveas_cb(Fl_Widget *w, void *v) {
  86     Application *app = (Application*)v;
  87     app->fc->title("Save As");
  88     app->fc->type(Fl_Native_File_Chooser::BROWSE_SAVE_FILE);    // need this if file doesn't exist yet
  89     switch ( app->fc->show() ) {
  90       case -1: break;   // Error
  91       case  1: break;   // Cancel
  92       default:          // Choice
  93         app->fc->preset_file(app->fc->filename());
  94         app->save(app->fc->filename());
  95         break;
  96     }
  97   }
  98   // Handle a 'Save' request from the menu
  99   static void save_cb(Fl_Widget *w, void *v) {
 100     Application *app = (Application*)v;
 101     if ( strlen(app->fc->filename()) == 0 ) {
 102       saveas_cb(w,v);
 103     } else {
 104       app->save(app->fc->filename());
 105     }
 106   }
 107   static void quit_cb(Fl_Widget *w, void *v) {
 108     exit(0);
 109   }
 110   // Return an 'untitled' default pathname
 111   const char* untitled_default() {
 112     static char *filename = 0;
 113     if ( !filename ) {
 114       const char *home =
 115         getenv("HOME") ? getenv("HOME") :                // unix
 116         getenv("HOME_PATH") ? getenv("HOME_PATH") :      // windows
 117         ".";                                             // other
 118       filename = (char*)malloc(strlen(home)+20);
 119       sprintf(filename, "%s/untitled.txt", home);
 120     }
 121     return(filename);
 122   }
 123 public:
 124   // CTOR
 125   Application() : Fl_Window(400,200,"Native File Chooser Example") {
 126     Fl_Menu_Bar *menu = new Fl_Menu_Bar(0,0,400,25);
 127     menu->add("&File/&Open",  FL_COMMAND+'o', open_cb, (void*)this);
 128     menu->add("&File/&Save",  FL_COMMAND+'s', save_cb, (void*)this);
 129     menu->add("&File/&Save As", 0,  saveas_cb, (void*)this);
 130     menu->add("&File/&Quit",  FL_COMMAND+'q', quit_cb);
 131     // Describe the demo..
 132     Fl_Box *box = new Fl_Box(20,25+20,w()-40,h()-40-25);
 133     box->color(45);
 134     box->box(FL_FLAT_BOX);
 135     box->align(FL_ALIGN_CENTER|FL_ALIGN_INSIDE|FL_ALIGN_WRAP);
 136     box->label("This demo shows an example of implementing "
 137                "common 'File' menu operations like:\n"
 138                "    File/Open, File/Save, File/Save As\n"
 139                "..using the Fl_Native_File_Chooser widget.\n\n"
 140                "Note 'Save' and 'Save As' really *does* create files! "
 141                "This is to show how behavior differs when "
 142                "files exist vs. do not.");
 143     box->labelsize(12);
 144     // Initialize the file chooser
 145     fc = new Fl_Native_File_Chooser();
 146     fc->filter("Text\t*.txt\n");
 147     fc->preset_file(untitled_default());
 148     end();
 149   }
 150 };
 151
 152 int main(int argc, char *argv[]) {
 153   Fl::scheme("gtk+");
 154   Application *app = new Application();
 155   app->show(argc,argv);
 156   return(Fl::run());
 157 }
 158
 159 //
 160 // End of "$Id: nativefilechooser-simple-app.cxx 8183 2011-01-04 17:31:56Z AlbrechtS $".
 161 //