Calendar: Ask about unsaved changes when closing the window :^)

The Calendar now asks about unsaved changes in the calendar when
attempting to close the window.

Userland/Applications/Calendar/CalendarWidget.cpp

@@ -1,5 +1,6 @@
 /*
  * Copyright (c) 2023, the SerenityOS developers.
+ * Copyright (c) 2023, David Ganz <david.g.ganz@gmail.com>
  *
  * SPDX-License-Identifier: BSD-2-Clause
  */
@@ -93,10 +94,14 @@ ErrorOr<NonnullRefPtr<CalendarWidget>> CalendarWidget::create(GUI::Window* paren
 
     file_menu->add_separator();
 
-    file_menu->add_action(GUI::CommonActions::make_quit_action([](auto&) {
+    file_menu->add_action(GUI::CommonActions::make_quit_action([&](auto&) {
+        if (!widget->request_close())
+            return;
         GUI::Application::the()->quit();
     }));
 
+    widget->m_save_action = save_action;
+
     auto event_menu = parent_window->add_menu("&Event"_string);
     event_menu->add_action(add_event_action);
 
@@ -114,6 +119,23 @@ ErrorOr<NonnullRefPtr<CalendarWidget>> CalendarWidget::create(GUI::Window* paren
     return widget;
 }
 
+bool CalendarWidget::request_close()
+{
+    if (!m_event_calendar->event_manager().is_dirty())
+        return true;
+
+    auto result = GUI::MessageBox::ask_about_unsaved_changes(window(), m_event_calendar->event_manager().current_filename());
+    if (result == GUI::MessageBox::ExecResult::Yes) {
+        m_save_action->activate();
+        return !m_event_calendar->event_manager().is_dirty();
+    }
+
+    if (result == GUI::MessageBox::ExecResult::No)
+        return true;
+
+    return false;
+}
+
 void CalendarWidget::create_on_events_change()
 {
     m_event_calendar->event_manager().on_events_change = [&]() {

Userland/Applications/Calendar/CalendarWidget.h

@@ -1,5 +1,6 @@
 /*
  * Copyright (c) 2023, the SerenityOS developers.
+ * Copyright (c) 2023, David Ganz <david.g.ganz@gmail.com>
  *
  * SPDX-License-Identifier: BSD-2-Clause
  */
@@ -24,6 +25,8 @@ public:
     void update_window_title();
     void load_file(FileSystemAccessClient::File file);
 
+    bool request_close();
+
 private:
     void create_on_tile_doubleclick();
 
@@ -43,6 +46,7 @@ private:
     ErrorOr<NonnullRefPtr<GUI::Action>> create_open_settings_action();
 
     OwnPtr<GUI::ActionGroup> m_view_type_action_group;
+    RefPtr<GUI::Action> m_save_action;
 
     RefPtr<EventCalendar> m_event_calendar;
 };

Userland/Applications/Calendar/main.cpp

@@ -1,5 +1,6 @@
 /*
  * Copyright (c) 2019-2020, Ryan Grieb <ryan.m.grieb@gmail.com>
+ * Copyright (c) 2023, David Ganz <david.g.ganz@gmail.com>
  *
  * SPDX-License-Identifier: BSD-2-Clause
  */
@@ -67,6 +68,12 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
     auto calendar_widget = TRY(Calendar::CalendarWidget::create(window));
     window->set_main_widget(calendar_widget);
 
+    window->on_close_request = [&]() -> GUI::Window::CloseRequestDecision {
+        if (calendar_widget->request_close())
+            return GUI::Window::CloseRequestDecision::Close;
+        return GUI::Window::CloseRequestDecision::StayOpen;
+    };
+
     window->show();
 
     if (!filename.is_empty()) {