MODULE files ;

(*
   m2-GTK4 example - the native GTK4 file dialog.

   A button opens a GtkFileDialog; the asynchronous callback receives
   the result and calls gtk_file_dialog_open_finish() to get a GFile,
   whose basename is shown in a label.

   Build:  make examples
   Run:    ./build/examples/files
*)

FROM Gio IMPORT g_application_run;
FROM GtkApplication IMPORT gtk_application_new;
FROM GtkApplicationWindow IMPORT gtk_application_window_new;
FROM GtkWindow IMPORT gtk_window_set_title, gtk_window_set_default_size,
   gtk_window_set_child, gtk_window_present;
FROM GtkBox IMPORT gtk_box_new, gtk_box_append, gtk_box_set_spacing;
FROM GtkEnums IMPORT GtkVertical;
FROM GtkLabel IMPORT gtk_label_new, gtk_label_set_text;
FROM GtkButton IMPORT gtk_button_new_with_label;
FROM GtkWidget IMPORT gtk_widget_set_margin_top,
   gtk_widget_set_margin_bottom, gtk_widget_set_margin_start,
   gtk_widget_set_margin_end;
FROM GtkFileDialog IMPORT gtk_file_dialog_new, gtk_file_dialog_open,
   gtk_file_dialog_open_finish, gtk_file_dialog_set_title;
FROM GFile IMPORT g_file_get_basename;
FROM GObject IMPORT g_object_unref;
FROM GLib IMPORT g_free;
FROM GtkClosures IMPORT Connect2;
FROM GtkUtils IMPORT CStrToM2, StrAppend;
FROM SYSTEM IMPORT ADDRESS, ADR;
FROM libc IMPORT printf;

CONST
   AppId = "org.example.m2gtk4.Files";

VAR
   dialog, window, status: ADDRESS;

PROCEDURE OnOpenClicked (button: ADDRESS; user: ADDRESS);
BEGIN
   gtk_file_dialog_open(dialog, window, NIL, ADR(OnOpenFinished), NIL)
END OnOpenClicked;

(* void finished(GObject *source, GAsyncResult *result, gpointer user_data) *)
PROCEDURE OnOpenFinished (source: ADDRESS; result: ADDRESS; user: ADDRESS);
VAR
   file, name: ADDRESS;
   buf: ARRAY [0..255] OF CHAR;
   line: ARRAY [0..287] OF CHAR;
BEGIN
   file := gtk_file_dialog_open_finish(dialog, result, NIL);
   IF file = NIL THEN
      gtk_label_set_text(status, "No file selected")
   ELSE
      name := g_file_get_basename(file);
      CStrToM2(name, buf);
      g_free(name);
      line[0] := 0C;
      StrAppend(line, "Opened: ");
      StrAppend(line, buf);
      gtk_label_set_text(status, line);
      g_object_unref(file)
   END
END OnOpenFinished;

PROCEDURE OnActivate (application: ADDRESS; data: ADDRESS);
VAR
   box, button: ADDRESS;
BEGIN
   dialog := gtk_file_dialog_new();
   gtk_file_dialog_set_title(dialog, "Open a file");

   status := gtk_label_new("No file selected");
   button := gtk_button_new_with_label("Open file...");
   Connect2(button, "clicked", OnOpenClicked, NIL);

   box := gtk_box_new(GtkVertical, 10);
   gtk_box_set_spacing(box, 10);
   gtk_widget_set_margin_top(box, 14);
   gtk_widget_set_margin_bottom(box, 14);
   gtk_widget_set_margin_start(box, 14);
   gtk_widget_set_margin_end(box, 14);
   gtk_box_append(box, button);
   gtk_box_append(box, status);

   window := gtk_application_window_new(application);
   gtk_window_set_title(window, "m2-GTK4 Files");
   gtk_window_set_default_size(window, 420, 160);
   gtk_window_set_child(window, box);
   gtk_window_present(window)
END OnActivate;

VAR
   app: ADDRESS;
BEGIN
   app := gtk_application_new(AppId, 0);
   IF app = NIL THEN
      printf("gtk_application_new failed\n");
      HALT(1)
   END;
   Connect2(app, "activate", OnActivate, NIL);
   g_application_run(app, 0, NIL)
END files.