MODULE adw ;

(*
   m2-GTK4 example - a libadwaita preferences application.

   AdwApplicationWindow > AdwToastOverlay > AdwToolbarView
     top bar - AdwHeaderBar (title + "About" button, packed end)
     content - AdwPreferencesPage >
                 AdwPreferencesGroup >
                   AdwActionRow (activatable -> toast)
                   AdwSwitchRow
                   AdwEntryRow
                   AdwComboRow
                   AdwExpanderRow (with a switch row inside)

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

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_pack_end,
   adw_header_bar_set_title_widget;
FROM AdwToolbarView IMPORT adw_toolbar_view_new, adw_toolbar_view_add_top_bar,
   adw_toolbar_view_set_content;
FROM AdwPreferencesPage IMPORT adw_preferences_page_new,
   adw_preferences_page_add, adw_preferences_page_set_title;
FROM AdwPreferencesGroup IMPORT adw_preferences_group_new,
   adw_preferences_group_add, adw_preferences_group_set_title,
   adw_preferences_group_set_description;
FROM AdwPreferencesRow IMPORT adw_preferences_row_set_title;
FROM AdwActionRow IMPORT adw_action_row_new, adw_action_row_set_subtitle,
   adw_action_row_set_icon_name;
FROM AdwSwitchRow IMPORT adw_switch_row_new;
FROM AdwEntryRow IMPORT adw_entry_row_new;
FROM AdwComboRow IMPORT adw_combo_row_new, adw_combo_row_set_model,
   adw_combo_row_set_selected;
FROM AdwExpanderRow IMPORT adw_expander_row_new, adw_expander_row_add_row;
FROM AdwToast IMPORT adw_toast_new, adw_toast_set_timeout;
FROM AdwToastOverlay IMPORT adw_toast_overlay_new,
   adw_toast_overlay_add_toast, adw_toast_overlay_set_child;
FROM AdwAboutWindow IMPORT adw_about_window_new,
   adw_about_window_set_application_name,
   adw_about_window_set_application_icon, adw_about_window_set_version,
   adw_about_window_set_developer_name, adw_about_window_set_comments,
   adw_about_window_set_website;
FROM GtkWindow IMPORT gtk_window_present;
FROM GtkButton IMPORT gtk_button_new_with_label;
FROM GtkLabel IMPORT gtk_label_new;
FROM GtkStringList IMPORT gtk_string_list_new, gtk_string_list_append;
FROM GtkClosures IMPORT Connect2;
FROM SYSTEM IMPORT ADDRESS;
FROM libc IMPORT printf;

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

VAR
   overlay: ADDRESS;

PROCEDURE ShowToast (text: ARRAY OF CHAR);
VAR
   toast: ADDRESS;
BEGIN
   toast := adw_toast_new(text);
   adw_toast_set_timeout(toast, 2);
   adw_toast_overlay_add_toast(overlay, toast)
END ShowToast;

(* void activated(AdwActionRow *row, gpointer data) *)
PROCEDURE OnRowActivated (row: ADDRESS; data: ADDRESS);
BEGIN
   ShowToast("Row activated")
END OnRowActivated;

PROCEDURE OnAbout (button: ADDRESS; data: ADDRESS);
VAR
   about: ADDRESS;
BEGIN
   about := adw_about_window_new();
   adw_about_window_set_application_name(about, "m2-GTK4");
   adw_about_window_set_application_icon(about, "application-x-executable");
   adw_about_window_set_version(about, "0.1");
   adw_about_window_set_developer_name(about, "m2-GTK4");
   adw_about_window_set_comments(about, "libadwaita bindings for GNU Modula-2");
   adw_about_window_set_website(about, "https://example.org");
   gtk_window_present(about)
END OnAbout;

PROCEDURE OnActivate (application: ADDRESS; data: ADDRESS);
VAR
   window, toolbar, header, aboutButton, page, group, row, sw, er, combo,
   list, expander, inner: ADDRESS;
BEGIN
   window := adw_application_window_new(application);

   aboutButton := gtk_button_new_with_label("About");
   Connect2(aboutButton, "clicked", OnAbout, NIL);

   header := adw_header_bar_new();
   adw_header_bar_set_title_widget(header, gtk_label_new("Preferences"));
   adw_header_bar_pack_end(header, aboutButton);

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

   page := adw_preferences_page_new();
   adw_preferences_page_set_title(page, "Settings");

   group := adw_preferences_group_new();
   adw_preferences_group_set_title(group, "General");
   adw_preferences_group_set_description(group, "Example Adwaita rows");

   row := adw_action_row_new();
   adw_preferences_row_set_title(row, "Appearance");
   adw_action_row_set_subtitle(row, "Tap to show a toast");
   adw_action_row_set_icon_name(row, "applications-graphics");
   Connect2(row, "activated", OnRowActivated, NIL);
   adw_preferences_group_add(group, row);

   sw := adw_switch_row_new();
   adw_preferences_row_set_title(sw, "Enable notifications");
   adw_preferences_group_add(group, sw);

   er := adw_entry_row_new();
   adw_preferences_row_set_title(er, "Name");
   adw_preferences_group_add(group, er);

   list := gtk_string_list_new(NIL);
   gtk_string_list_append(list, "System");
   gtk_string_list_append(list, "Light");
   gtk_string_list_append(list, "Dark");
   combo := adw_combo_row_new();
   adw_preferences_row_set_title(combo, "Theme");
   adw_combo_row_set_model(combo, list);
   adw_combo_row_set_selected(combo, 0);
   adw_preferences_group_add(group, combo);

   expander := adw_expander_row_new();
   adw_preferences_row_set_title(expander, "Advanced");
   inner := adw_switch_row_new();
   adw_preferences_row_set_title(inner, "Developer mode");
   adw_expander_row_add_row(expander, inner);
   adw_preferences_group_add(group, expander);

   adw_preferences_page_add(page, group);
   adw_toolbar_view_set_content(toolbar, page);

   overlay := adw_toast_overlay_new();
   adw_toast_overlay_set_child(overlay, toolbar);
   adw_application_window_set_content(window, overlay);

   gtk_window_present(window)
END OnActivate;

VAR
   app: ADDRESS;
BEGIN
   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.