MODULE adw_views ;

(*
   m2-GTK4 example - a tabbed window built from the GNOME (libadwaita)
   widgets:

     AdwApplicationWindow > AdwToolbarView
       top bar - AdwHeaderBar
                   title widget: AdwTabBar
                   packed start: AdwTabButton (opens AdwTabOverview)
                   packed end:   "+" button (adds a tab)
       content - AdwTabView

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

FROM Gio IMPORT g_application_run;
FROM AdwApplication IMPORT adw_application_new;
FROM AdwApplicationWindow IMPORT adw_application_window_new,
   adw_application_window_set_content;
FROM AdwHeaderBar IMPORT adw_header_bar_new, adw_header_bar_set_title_widget,
   adw_header_bar_pack_start, adw_header_bar_pack_end;
FROM AdwToolbarView IMPORT adw_toolbar_view_new, adw_toolbar_view_add_top_bar,
   adw_toolbar_view_set_content;
FROM AdwTabView IMPORT adw_tab_view_new, adw_tab_view_append;
FROM AdwTabBar IMPORT adw_tab_bar_new, adw_tab_bar_set_view;
FROM AdwTabButton IMPORT adw_tab_button_new, adw_tab_button_set_view;
FROM AdwTabOverview IMPORT adw_tab_overview_new, adw_tab_overview_set_view;
FROM AdwTabPage IMPORT adw_tab_page_set_title;
FROM GtkWindow IMPORT gtk_window_present, gtk_window_set_default_size;
FROM GtkButton IMPORT gtk_button_new_with_label;
FROM GtkLabel IMPORT gtk_label_new;
FROM GtkClosures IMPORT Connect2;
FROM GtkUtils IMPORT IntToStr, StrAppend;
FROM SYSTEM IMPORT ADDRESS;
FROM libc IMPORT printf;

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

VAR
   counter: INTEGER;

PROCEDURE AddTab (view: ADDRESS; title: ARRAY OF CHAR);
VAR
   page: ADDRESS;
BEGIN
   page := adw_tab_view_append (view, gtk_label_new(title));
   adw_tab_page_set_title (page, title)
END AddTab;

PROCEDURE OnNewTab (button: ADDRESS; data: ADDRESS);
VAR
   view: ADDRESS;
   num: ARRAY [0..15] OF CHAR;
   text: ARRAY [0..31] OF CHAR;
BEGIN
   view := data;
   INC(counter);
   IntToStr(counter, num);
   text := "Tab ";
   StrAppend(text, num);
   AddTab(view, text)
END OnNewTab;

PROCEDURE OnActivate (application: ADDRESS; data: ADDRESS);
VAR
   window, toolbar, header, tabview, tabbar, tabbutton, overview,
   newbutton: ADDRESS;
BEGIN
   tabview := adw_tab_view_new();
   AddTab(tabview, "Home");
   AddTab(tabview, "About");

   tabbar := adw_tab_bar_new();
   adw_tab_bar_set_view(tabbar, tabview);

   tabbutton := adw_tab_button_new();
   adw_tab_button_set_view(tabbutton, tabview);

   overview := adw_tab_overview_new();
   adw_tab_overview_set_view(overview, tabview);

   newbutton := gtk_button_new_with_label("+");
   Connect2(newbutton, "clicked", OnNewTab, tabview);

   header := adw_header_bar_new();
   adw_header_bar_set_title_widget(header, tabbar);
   adw_header_bar_pack_start(header, tabbutton);
   adw_header_bar_pack_end(header, newbutton);

   toolbar := adw_toolbar_view_new();
   adw_toolbar_view_add_top_bar(toolbar, header);
   adw_toolbar_view_set_content(toolbar, tabview);

   window := adw_application_window_new(application);
   gtk_window_set_default_size(window, 560, 400);
   adw_application_window_set_content(window, toolbar);
   gtk_window_present(window)
END OnActivate;

VAR
   app: ADDRESS;
BEGIN
   counter := 2;
   app := adw_application_new(AppId, 0);
   IF app = NIL THEN
      printf("adw_application_new failed\n");
      HALT(1)
   END;
   Connect2(app, "activate", OnActivate, NIL);
   g_application_run(app, 0, NIL)
END adw_views.