Screensaver: Add a screensaver launcher application

Similar to the Settings application, this adds a single Screensaver
application to launch all screensaver demos. This is to declutter the
taskbar menu a bit.

Base/res/apps/GradientScreensaver.af

@@ -1,4 +1,5 @@
 [App]
 Name=Gradient Screensaver
 Executable=/bin/GradientScreensaver
-Category=Demos
+Category=Demos/Screensaver
+ExcludeFromSystemMenu=true

Base/res/apps/Screensaver.af

@@ -0,0 +1,4 @@
+[App]
+Name=Screensaver
+Executable=/bin/Screensaver
+Category=Demos

Base/res/apps/Starfield.af

@@ -1,4 +1,5 @@
 [App]
 Name=Starfield
 Executable=/bin/Starfield
-Category=Demos
+Category=Demos/Screensaver
+ExcludeFromSystemMenu=true

Base/res/apps/Tubes.af

@@ -1,4 +1,5 @@
 [App]
 Name=Tubes
 Executable=/bin/Tubes
-Category=Demos
+Category=Demos/Screensaver
+ExcludeFromSystemMenu=true

Userland/Demos/CMakeLists.txt

@@ -5,6 +5,7 @@ add_subdirectory(LibGfxDemo)
 add_subdirectory(LibGfxScaleDemo)
 add_subdirectory(Mandelbrot)
 add_subdirectory(ModelGallery)
+add_subdirectory(Screensaver)
 add_subdirectory(Starfield)
 add_subdirectory(Tubes)
 add_subdirectory(WidgetGallery)

Userland/Demos/Screensaver/CMakeLists.txt

@@ -0,0 +1,11 @@
+serenity_component(
+    Screensaver
+    TARGETS Screensaver
+)
+
+set(SOURCES
+    main.cpp
+)
+
+serenity_app(Screensaver ICON app-screensaver)
+target_link_libraries(Screensaver PRIVATE LibDesktop LibGUI LibCore LibGfx LibMain)

Userland/Demos/Screensaver/main.cpp

@@ -0,0 +1,107 @@
+/*
+ * Copyright (c) 2023, Tim Flynn <trflynn89@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <AK/QuickSort.h>
+#include <LibCore/System.h>
+#include <LibDesktop/AppFile.h>
+#include <LibGUI/Application.h>
+#include <LibGUI/BoxLayout.h>
+#include <LibGUI/Icon.h>
+#include <LibGUI/IconView.h>
+#include <LibGUI/Menu.h>
+#include <LibGUI/Model.h>
+#include <LibGUI/Process.h>
+#include <LibGUI/Window.h>
+#include <LibMain/Main.h>
+
+class ScreensaverAppsModel final : public GUI::Model {
+public:
+    ScreensaverAppsModel()
+    {
+        Desktop::AppFile::for_each([&](Desktop::AppFile& app_file) {
+            if (app_file.category() != "Demos/Screensaver"sv)
+                return;
+            m_apps.append(app_file);
+        });
+
+        quick_sort(m_apps, [](auto& a, auto& b) { return a->name() < b->name(); });
+    }
+
+    virtual int row_count(GUI::ModelIndex const&) const override { return static_cast<int>(m_apps.size()); }
+    virtual int column_count(GUI::ModelIndex const&) const override { return 1; }
+
+    virtual GUI::ModelIndex index(int row, int column, GUI::ModelIndex const&) const override
+    {
+        if (row < 0 || row >= static_cast<int>(m_apps.size()))
+            return {};
+        return create_index(row, column, &m_apps[row]);
+    }
+
+    virtual GUI::Variant data(GUI::ModelIndex const& index, GUI::ModelRole role) const override
+    {
+        auto const& app = m_apps[index.row()];
+        if (role == GUI::ModelRole::Icon)
+            return app->icon();
+
+        if (role == GUI::ModelRole::Display) {
+            if (app->name().ends_with(" Screensaver"sv))
+                return app->name().substring(0, app->name().length() - " Screensaver"sv.length());
+            return app->name();
+        }
+
+        if (role == GUI::ModelRole::Custom)
+            return app->executable();
+
+        return {};
+    }
+
+private:
+    // NonnullRefPtrVector doesn't allow us to quick_sort() it, because its operator[] returns T&.
+    Vector<NonnullRefPtr<Desktop::AppFile>> m_apps;
+};
+
+ErrorOr<int> serenity_main(Main::Arguments arguments)
+{
+    TRY(Core::System::pledge("stdio thread recvfd sendfd rpath cpath wpath unix proc exec"));
+
+    auto app = TRY(GUI::Application::try_create(arguments));
+
+    TRY(Core::System::pledge("stdio thread recvfd sendfd rpath cpath wpath proc exec"));
+
+    auto app_icon = GUI::Icon::default_icon("app-screensaver"sv);
+
+    auto window = TRY(GUI::Window::try_create());
+    window->set_title("Screensaver");
+    window->resize(360, 240);
+
+    auto file_menu = TRY(window->try_add_menu("&File"));
+    file_menu->add_action(GUI::CommonActions::make_quit_action([&](auto&) {
+        app->quit();
+    }));
+
+    auto help_menu = TRY(window->try_add_menu("&Help"));
+    TRY(help_menu->try_add_action(GUI::CommonActions::make_command_palette_action(window)));
+    TRY(help_menu->try_add_action(GUI::CommonActions::make_about_action("Screensaver", app_icon, window)));
+
+    auto main_widget = TRY(window->try_set_main_widget<GUI::Widget>());
+    main_widget->set_fill_with_background_color(true);
+    main_widget->set_layout<GUI::VerticalBoxLayout>();
+
+    auto icon_view = TRY(main_widget->try_add<GUI::IconView>());
+    icon_view->set_should_hide_unnecessary_scrollbars(true);
+    auto model = adopt_ref(*new ScreensaverAppsModel);
+    icon_view->set_model(*model);
+
+    icon_view->on_activation = [&](GUI::ModelIndex const& index) {
+        auto executable = model->data(index, GUI::ModelRole::Custom).as_string();
+        GUI::Process::spawn_or_show_error(window, executable);
+    };
+
+    window->set_icon(app_icon.bitmap_for_size(16));
+    window->show();
+
+    return app->exec();
+}