MODULE popover ;

(*
   m2-GTK4 example - popovers.

   A button pops up a GtkPopover with some content, and a GtkMenuButton
   opens a GtkPopoverMenu built from a GMenu (with a working Quit item).

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

FROM Gio IMPORT g_application_run, g_application_quit;
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;
FROM GtkButton IMPORT gtk_button_new_with_label;
FROM GtkPopover IMPORT gtk_popover_new, gtk_popover_set_child,
   gtk_popover_popup;
FROM GtkPopoverMenu IMPORT gtk_popover_menu_new_from_model;
FROM GtkMenuButton IMPORT gtk_menu_button_new,
   gtk_menu_button_set_icon_name, gtk_menu_button_set_popover;
FROM GtkWidget IMPORT gtk_widget_set_parent, gtk_widget_set_margin_top,
   gtk_widget_set_margin_bottom, gtk_widget_set_margin_start,
   gtk_widget_set_margin_end;
FROM GMenu IMPORT g_menu_new, g_menu_append;
FROM GSimpleAction IMPORT g_simple_action_new;
FROM GActionMap IMPORT g_action_map_add_action;
FROM GtkClosures IMPORT Connect2;
FROM GtkUtils IMPORT Connect;
FROM SYSTEM IMPORT ADDRESS, ADR;
FROM libc IMPORT printf;

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

VAR
   app, popover: ADDRESS;

PROCEDURE OnQuit (action: ADDRESS; param: ADDRESS; data: ADDRESS);
BEGIN
   g_application_quit(app)
END OnQuit;

PROCEDURE OnShow (button: ADDRESS; user: ADDRESS);
BEGIN
   gtk_popover_popup(popover)
END OnShow;

PROCEDURE OnActivate (application: ADDRESS; data: ADDRESS);
VAR
   window, box, button, content, menu, menuButton, action: ADDRESS;
BEGIN
   action := g_simple_action_new("quit", NIL);
   Connect(action, "activate", ADR(OnQuit), NIL);
   g_action_map_add_action(application, action);

   button := gtk_button_new_with_label("Show popover");
   content := gtk_label_new("Popover content");
   popover := gtk_popover_new();
   gtk_popover_set_child(popover, content);
   gtk_widget_set_parent(popover, button);
   Connect2(button, "clicked", OnShow, NIL);

   menu := g_menu_new();
   g_menu_append(menu, "Quit", "app.quit");
   menuButton := gtk_menu_button_new();
   gtk_menu_button_set_icon_name(menuButton, "open-menu-symbolic");
   gtk_menu_button_set_popover(menuButton,
      gtk_popover_menu_new_from_model(menu));

   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, button);
   gtk_box_append(box, menuButton);

   window := gtk_application_window_new(application);
   gtk_window_set_title(window, "m2-GTK4 Popover");
   gtk_window_set_default_size(window, 360, 160);
   gtk_window_set_child(window, box);
   gtk_window_present(window)
END OnActivate;

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 popover.