MODULE dialogs ;

(*
   m2-GTK4 example - modern dialogs.

   "Alert" shows a GtkAlertDialog with custom buttons; "Choose colour"
   opens a GtkColorDialog asynchronously and reports the chosen GdkRGBA
   in a label.

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

FROM Gio IMPORT g_application_run;
FROM GtkApplication IMPORT gtk_application_new;
FROM GtkWindow IMPORT gtk_application_window_new, 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 GtkAlertDialog IMPORT gtk_alert_dialog_new,
   gtk_alert_dialog_set_message, gtk_alert_dialog_set_detail,
   gtk_alert_dialog_set_buttons, gtk_alert_dialog_set_default_button,
   gtk_alert_dialog_show;
FROM GtkColorDialog IMPORT gtk_color_dialog_new, gtk_color_dialog_set_title,
   gtk_color_dialog_set_modal, gtk_color_dialog_choose_rgba,
   gtk_color_dialog_choose_rgba_finish;
FROM GError IMPORT GError;
FROM Gdk IMPORT gdk_rgba_free, gdk_rgba_to_string, GdkRGBAPtr;
FROM GtkUtils IMPORT CStrToM2, Free, ClearError;
FROM GtkClosures IMPORT Connect2;
FROM SYSTEM IMPORT ADDRESS, ADR, CAST;
FROM libc IMPORT printf;

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

VAR
   window, status, alert, colorDialog: ADDRESS;
   okLabel: ARRAY [0..2] OF CHAR;
   cancelLabel: ARRAY [0..7] OF CHAR;
   buttons: ARRAY [0..2] OF ADDRESS;

PROCEDURE OnAlert (button: ADDRESS; user: ADDRESS);
BEGIN
   gtk_alert_dialog_show(alert, window)
END OnAlert;

(* void chosen(GObject *source, GAsyncResult *result, gpointer user_data) *)
PROCEDURE OnColorChosen (source: ADDRESS; result: ADDRESS; user: ADDRESS);
VAR
   rgba: ADDRESS;
   p: GdkRGBAPtr;
   str: ADDRESS;
   buf: ARRAY [0..63] OF CHAR;
   err: GError;
BEGIN
   err := NIL;
   rgba := gtk_color_dialog_choose_rgba_finish(colorDialog, result, err);
   IF rgba # NIL THEN
      p := CAST(GdkRGBAPtr, rgba);
      str := gdk_rgba_to_string(p^);
      CStrToM2(str, buf);
      gtk_label_set_text(status, buf);
      Free(str);
      gdk_rgba_free(rgba)
   ELSE
      gtk_label_set_text(status, "No colour chosen");
      ClearError(err)
   END
END OnColorChosen;

PROCEDURE OnColor (button: ADDRESS; user: ADDRESS);
BEGIN
   gtk_color_dialog_choose_rgba(colorDialog, window, NIL, NIL,
                                ADR(OnColorChosen), NIL)
END OnColor;

PROCEDURE OnActivate (application: ADDRESS; data: ADDRESS);
VAR
   box, alertButton, colorButton: ADDRESS;
BEGIN
   okLabel := "OK";
   cancelLabel := "Cancel";
   buttons[0] := ADR(okLabel);
   buttons[1] := ADR(cancelLabel);
   buttons[2] := NIL;

   alert := gtk_alert_dialog_new("This is a test alert");
   gtk_alert_dialog_set_message(alert, "Delete the file?");
   gtk_alert_dialog_set_detail(alert, "This cannot be undone.");
   gtk_alert_dialog_set_buttons(alert, ADR(buttons));
   gtk_alert_dialog_set_default_button(alert, 0);

   colorDialog := gtk_color_dialog_new();
   gtk_color_dialog_set_title(colorDialog, "Pick a colour");
   gtk_color_dialog_set_modal(colorDialog, 1);

   alertButton := gtk_button_new_with_label("Alert");
   Connect2(alertButton, "clicked", OnAlert, NIL);
   colorButton := gtk_button_new_with_label("Choose colour");
   Connect2(colorButton, "clicked", OnColor, NIL);
   status := gtk_label_new("No colour chosen");

   box := gtk_box_new(GtkVertical, 12);
   gtk_box_set_spacing(box, 12);
   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, alertButton);
   gtk_box_append(box, colorButton);
   gtk_box_append(box, status);

   window := gtk_application_window_new(application);
   gtk_window_set_title(window, "m2-GTK4 Dialogs");
   gtk_window_set_default_size(window, 400, 200);
   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 dialogs.