Chaditor/chaditor.cpp at master · sektant1/Chaditor · GitHub

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#include <FL/Enumerations.H>
#include <FL/Fl.H>
#include <FL/Fl_Double_Window.H>
#include <FL/Fl_Menu_Bar.H>
#include <FL/Fl_Text_Buffer.H>
#include <FL/Fl_Text_Editor.H>
#include <FL/filename.H>
#include <FL/fl_ask.H>
#include <FL/fl_string_functions.h>
#include <FL/platform_types.h>

Fl_Double_Window *app_window                = NULL;
bool              text_changed              = false;
char              app_filename[FL_PATH_MAX] = "";
Fl_Menu_Bar      *app_menu_bar              = NULL;
Fl_Text_Editor   *app_editor                = NULL;
Fl_Text_Editor   *app_split_editor          = NULL;  // for later
Fl_Text_Buffer   *app_text_buffer           = NULL;

void build_app_window()
{
    app_window = new Fl_Double_Window(640, 480, "Chaditor");
}

void update_title()
{
    const char *fname = NULL;
    if (app_filename[0]) {
        fname = fl_filename_name(app_filename);
    }
    if (fname) {
        char buf[FL_PATH_MAX + 3];
        buf[FL_PATH_MAX + 2] =
            '\0';  // ensure that the buffer is always terminated
        if (text_changed) {
            snprintf(buf, FL_PATH_MAX + 2, "%s *", fname);
        } else {
            snprintf(buf, FL_PATH_MAX + 2, "%s", fname);
        }
        app_window->copy_label(buf);
    } else {
        app_window->label("Chaditor");
    }
}

void set_changed(bool v)
{
    if (v != text_changed) {
        text_changed = v;
        update_title();
    }
}

void set_filename(const char *new_filename)
{
    if (new_filename) {
        fl_strlcpy(app_filename, new_filename, FL_PATH_MAX);
    } else {
        app_filename[0] = 0;
    }
    update_title();
}

void menu_quit_callback(Fl_Widget *, void *)
{
    if (text_changed) {
        int c = fl_choice("Changes in your text have not been saved.\n"
                      "Do you want to quit the Chaditor anyway?",
                      "Quit", "Cancel", NULL);
        if (c == 1) {
            return;
        }
    }
    Fl::hide_all_windows();
}

void build_app_menu_bar()
{
    app_window->begin();
    app_menu_bar = new Fl_Menu_Bar(0, 0, app_window->w(), 25);
    app_menu_bar->add("File/Quit Editor", FL_COMMAND + 'q', menu_quit_callback);
    app_window->callback(menu_quit_callback);
    app_window->end();
}

void menu_new_callback(Fl_Widget *, void *)
{
    app_text_buffer->text("");
    set_changed(false);
}

void text_changed_callback(int, int n_inserted, int n_deleted, int,
                           const char *, void *)
{
    if (n_inserted || n_deleted) {
        set_changed(true);
    }
}

void build_main_editor()
{
    app_window->begin();
    app_text_buffer = new Fl_Text_Buffer();
    app_text_buffer->add_modify_callback(text_changed_callback, NULL);
    app_editor = new Fl_Text_Editor(0,
                                    app_menu_bar->h(),
                                    app_window->w(),
                                    app_window->h() - app_menu_bar->h());
    app_editor->buffer(app_text_buffer);
    app_editor->textfont(FL_COURIER);
    app_window->resizable(app_editor);
    app_window->end();
    int ix = app_menu_bar->find_index(menu_quit_callback);
    app_menu_bar->insert(ix, "New", FL_COMMAND + 'n', menu_new_callback);
}

int main(int argc, char **argv)
{
    build_app_window();
    build_app_menu_bar();
    build_main_editor();
    app_window->show(argc, argv);
    return Fl::run();
}