Calendar: Add a Calendar settings dialog for the first day of the week

This commit adds a new settings dialog for the Calendar application and
applet. It allows the user to specify their preferred first day of the
week.

Userland/Applications/CalendarSettings/CMakeLists.txt

@@ -0,0 +1,17 @@
+serenity_component(
+    CalendarSettings
+    RECOMMENDED
+    TARGETS CalendarSettings
+)
+
+compile_gml(CalendarSettingsWidget.gml CalendarSettingsWidgetGML.h calendar_settings_widget_gml)
+
+set(SOURCES
+    main.cpp
+    CalendarSettingsWidget.cpp
+    CalendarSettingsWidget.h
+    CalendarSettingsWidgetGML.h
+)
+
+serenity_app(CalendarSettings ICON app-calendar)
+target_link_libraries(CalendarSettings LibConfig LibGUI LibMain)

Userland/Applications/CalendarSettings/CalendarSettingsWidget.cpp

@@ -0,0 +1,33 @@
+/*
+ * Copyright (c) 2022-2022, Olivier De Cannière <olivier.decanniere96@gmail.com>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include "CalendarSettingsWidget.h"
+#include <AK/DateConstants.h>
+#include <Applications/CalendarSettings/CalendarSettingsWidgetGML.h>
+#include <LibConfig/Client.h>
+#include <LibGUI/ItemListModel.h>
+
+void CalendarSettingsWidget::apply_settings()
+{
+    Config::write_string("Calendar"sv, "View"sv, "FirstDayOfWeek"sv, m_first_day_of_week_combobox->text());
+}
+
+void CalendarSettingsWidget::reset_default_values()
+{
+    m_first_day_of_week_combobox->set_text("Sunday");
+}
+
+CalendarSettingsWidget::CalendarSettingsWidget()
+{
+    load_from_gml(calendar_settings_widget_gml);
+    m_first_day_of_week_combobox = *find_descendant_of_type_named<GUI::ComboBox>("first_day_of_week");
+    m_first_day_of_week_combobox->set_text(Config::read_string("Calendar"sv, "View"sv, "FirstDayOfWeek"sv, "Sunday"sv));
+    m_first_day_of_week_combobox->set_only_allow_values_from_model(true);
+    m_first_day_of_week_combobox->set_model(*GUI::ItemListModel<StringView, Array<StringView, 7>>::create(AK::long_day_names));
+    m_first_day_of_week_combobox->on_change = [&](auto, auto) {
+        set_modified(true);
+    };
+}

Userland/Applications/CalendarSettings/CalendarSettingsWidget.gml

@@ -0,0 +1,38 @@
+@GUI::Frame {
+    fill_with_background_color: true
+    layout: @GUI::VerticalBoxLayout {
+        margins: [8]
+        spacing: 5
+    }
+
+    @GUI::GroupBox {
+        title: "Preferred first day of week"
+        fixed_height: 72
+        layout: @GUI::VerticalBoxLayout {
+            margins: [6]
+            spacing: 2
+        }
+
+        @GUI::Label {
+            text: "Determines which day a week starts with in the calendar view."
+            word_wrap: true
+            text_alignment: "CenterLeft"
+        }
+
+        @GUI::Widget {
+            layout: @GUI::HorizontalBoxLayout {
+                spacing: 16
+            }
+
+            @GUI::Label {
+                text: "First day:"
+                text_alignment: "CenterLeft"
+                fixed_width: 70
+            }
+
+           @GUI::ComboBox {
+               name: "first_day_of_week"
+           }
+        }
+    }
+}

Userland/Applications/CalendarSettings/CalendarSettingsWidget.h

@@ -0,0 +1,23 @@
+/*
+ * Copyright (c) 2022-2022, Olivier De Cannière <olivier.decanniere96@gmail.com>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <LibGUI/ComboBox.h>
+#include <LibGUI/SettingsWindow.h>
+
+class CalendarSettingsWidget final : public GUI::SettingsWindow::Tab {
+    C_OBJECT(CalendarSettingsWidget)
+
+public:
+    virtual void apply_settings() override;
+    virtual void reset_default_values() override;
+
+private:
+    CalendarSettingsWidget();
+
+    RefPtr<GUI::ComboBox> m_first_day_of_week_combobox;
+};

Userland/Applications/CalendarSettings/main.cpp

@@ -0,0 +1,42 @@
+/*
+ * Copyright (c) 2022-2022, Olivier De Cannière <olivier.decanniere96@gmail.com>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include "CalendarSettingsWidget.h"
+#include <LibConfig/Client.h>
+#include <LibCore/ArgsParser.h>
+#include <LibCore/System.h>
+#include <LibGUI/Application.h>
+#include <LibGUI/Icon.h>
+#include <LibGUI/SettingsWindow.h>
+#include <LibMain/Main.h>
+
+ErrorOr<int> serenity_main(Main::Arguments arguments)
+{
+    TRY(Core::System::pledge("stdio rpath recvfd sendfd unix"));
+
+    auto app = TRY(GUI::Application::try_create(arguments));
+
+    Config::pledge_domain("Calendar");
+
+    StringView selected_tab;
+    Core::ArgsParser args_parser;
+    args_parser.add_option(selected_tab, "Tab, only option is 'calendar'", "open-tab", 't', "tab");
+    args_parser.parse(arguments);
+
+    TRY(Core::System::pledge("stdio rpath recvfd sendfd"));
+    TRY(Core::System::unveil("/res", "r"));
+    TRY(Core::System::unveil(nullptr, nullptr));
+
+    auto app_icon = GUI::Icon::default_icon("app-calendar"sv);
+
+    auto window = TRY(GUI::SettingsWindow::create("Calendar Settings", GUI::SettingsWindow::ShowDefaultsButton::Yes));
+    (void)TRY(window->add_tab<CalendarSettingsWidget>("Calendar"sv, "Calendar"sv));
+    window->set_icon(app_icon.bitmap_for_size(16));
+    window->set_active_tab(selected_tab);
+
+    window->show();
+    return app->exec();
+}