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//
// An example of how to use Fl_Native_File_Chooser to open & save files.
//
// Copyright 2010 Greg Ercolano.
// Copyright 1998-2017 by Bill Spitzak and others.
//
// This library is free software. Distribution and use rights are outlined in
// the file "COPYING" which should have been included with this file. If this
// file is missing or damaged, see the license at:
//
// https://www.fltk.org/COPYING.php
//
// Please see the following page on how to report bugs and issues:
//
// https://www.fltk.org/bugs.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_Box.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 = fl_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 = fl_fopen(filename, "w"); // create file if it doesn't exist
if ( fp ) {
// A real app would do something useful here.
fprintf(fp, "Hello world.\n");
fclose(fp);
} else {
fl_message("Error: %s: %s", filename, strerror(errno));
}
} else {
// A real app would do something useful here.
}
}
// 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 =
fl_getenv("HOME") ? fl_getenv("HOME") : // unix
fl_getenv("HOME_PATH") ? fl_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", FL_COMMAND+'o', open_cb, (void*)this);
menu->add("&File/&Save", FL_COMMAND+'s', save_cb, (void*)this);
menu->add("&File/&Save As", 0, saveas_cb, (void*)this);
menu->add("&File/&Quit", FL_COMMAND+'q', quit_cb);
// Describe the demo..
Fl_Box *box = new Fl_Box(20,25+20,w()-40,h()-40-25);
box->color(45);
box->box(FL_FLAT_BOX);
box->align(FL_ALIGN_CENTER|FL_ALIGN_INSIDE|FL_ALIGN_WRAP);
box->label("This demo shows an example of implementing "
"common 'File' menu operations like:\n"
" File/Open, File/Save, File/Save As\n"
"..using the Fl_Native_File_Chooser widget.\n\n"
"Note 'Save' and 'Save As' really *does* create files! "
"This is to show how behavior differs when "
"files exist vs. do not.");
box->labelsize(12);
// 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());
}
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