fltk-another-example.cpp

#include <string>
#include <iostream>
#include <cstdlib>

#include <FL/Fl.H>
#include <FL/fl_draw.H>
#include <FL/Fl_Window.H>
#include <FL/Fl_Box.H>
#include <FL/Fl_Native_File_Chooser.h>
#include <FL/Fl_Output.H>
#include <FL/Fl_Menu_Bar.H>
#include <FL/Fl_Value_Slider.H>
#include <FL/Fl_Button.H>
#include <FL/Fl_Text_Display.H>
#include <Fl/fl_ask.h>
#include <Fl/fl_file_chooser.h>

//this example isn't mine. It is taken from the following PDF:
//https://courses.cs.washington.edu/courses/cse557/00wi/projects/tutorial.pdf

Fl_Window *window;
Fl_Window *dlg;
Fl_Menu_Bar *menubar;
Fl_Slider *slider;
Fl_Button *button;

void cb_file_select(Fl_Widget *o, void*v) {
    char msg[256];
    char *newfile = fl_file_chooser("Choose a file", "*.cpp", NULL);

    if (newfile != NULL) {
        sprintf(msg, "YOu choose %s", newfile);
        fl_message(msg);
    }
}

void cb_open_dialog(Fl_Widget *o, void *v) {
    dlg->show();
}

void cb_pass(Fl_Widget *o, void *v) {
    fl_message((char*)v);
}

void cb_quit(Fl_Widget *o, void *v) {
    dlg->hide();
    window->hide();
}

void cb_about() {
    fl_message("This is about.");
}

void cb_slides(Fl_Widget *o, void *v) {
    window->resize(window->x(), window->y(),
        10*(int)(((Fl_Slider*)o)->value()), window->h());
    menubar->resize(0, 0, 10*(int)(((Fl_Slider *)o)->value()), 25);
}

void cb_reset(Fl_Widget* o, void *v) {
    slider->value(20);
    cb_slides(slider, (void*)20);
}

char fltk[] = "fltk"; char opengl[] = "opengl";

Fl_Menu_Item menuitems[] = {
    {"&File", 0, 0, 0, FL_SUBMENU},
    {"File_&Selector...", FL_ALT + 's', (Fl_Callback*)cb_file_select},
    {"Open_&Dialog",      FL_ALT +'d' , (Fl_Callback*)cb_open_dialog, 0, FL_MENU_DIVIDER},
    {"&Fltk",             FL_ALT + 'f', (Fl_Callback*)cb_pass, (void*)fltk},
    {"&OpenGl",           FL_ALT + 'o', (Fl_Callback*)cb_pass, (void*)opengl, FL_MENU_DIVIDER},
    {"&Quit",             FL_ALT + 'q' , (Fl_Callback*)cb_quit},
    {0},
    {"&Help", 0, 0, 0, FL_SUBMENU},
    {"&About", FL_ALT + 'a', (Fl_Callback*)cb_about},
    {0},
    {0}
};

int main (int argc, char ** argv)
{
    window = new Fl_Window(300, 300, 200, 200, "Foo");
    menubar = new Fl_Menu_Bar(0, 0, 200, 25);
    menubar->menu(menuitems);

    window->callback(cb_quit);
    window->when(FL_HIDE);
    window->end();

    dlg = new Fl_Window(300, 530, 200, 70, "dialog");
    slider = new Fl_Value_Slider(0, 10, 150, 20, "Slider");
    slider->type(FL_HOR_NICE_SLIDER);
    slider->labelfont(FL_COURIER);
    slider->labelsize(12);
    slider->minimum(1);
    slider->maximum(40);
    slider->step(1);
    slider->value(20);
    slider->align(FL_ALIGN_RIGHT);
    slider->callback(cb_slides);

    Fl_Button *button = new Fl_Button(60, 40, 80, 20, "Reset");
    button->callback(cb_reset);

    dlg->end();

    window->show(argc, argv);

    return(Fl::run());
}