Solitaire: Convert Solitaire window to be created from GML

No functionial change here, but this more easily allows for adding GUI
elements to the Solitaire window. This nests the SolitaireWidget as a
child of the main window's widget so that the SolitaireWidget does not
color the entire window green when it paints its background.

Userland/Games/Solitaire/CMakeLists.txt

@@ -1,8 +1,11 @@
+compile_gml(Solitaire.gml SolitaireGML.h solitaire_gml)
+
 set(SOURCES
     Card.cpp
     CardStack.cpp
     Game.cpp
     main.cpp
+    SolitaireGML.h
 )
 
 serenity_app(Solitaire ICON app-solitaire)

Userland/Games/Solitaire/Game.cpp

@@ -8,17 +8,16 @@
 #include <LibGUI/Painter.h>
 #include <time.h>
 
+REGISTER_WIDGET(Solitaire, Game);
+
 namespace Solitaire {
 
 static const Color s_background_color { Color::from_rgb(0x008000) };
 static constexpr uint8_t new_game_animation_delay = 5;
 static constexpr int s_timer_interval_ms = 1000 / 60;
 
-Game::Game(Function<void(uint32_t)>&& on_score_update)
-    : m_on_score_update(move(on_score_update))
+Game::Game()
 {
-    set_fill_with_background_color(false);
-
     m_stacks[Stock] = CardStack({ 10, 10 }, CardStack::Type::Stock);
     m_stacks[Waste] = CardStack({ 10 + Card::width + 10, 10 }, CardStack::Type::Waste);
     m_stacks[Foundation4] = CardStack({ Game::width - Card::width - 10, 10 }, CardStack::Type::Foundation);
@@ -120,7 +119,9 @@ void Game::setup()
 void Game::update_score(int to_add)
 {
     m_score = max(static_cast<int>(m_score) + to_add, 0);
-    m_on_score_update(m_score);
+
+    if (on_score_update)
+        on_score_update(m_score);
 }
 
 void Game::keydown_event(GUI::KeyEvent& event)

Userland/Games/Solitaire/Game.h

@@ -21,8 +21,10 @@ public:
     virtual ~Game() override;
     void setup();
 
+    Function<void(uint32_t)> on_score_update;
+
 private:
-    Game(Function<void(uint32_t)>&& on_score_update);
+    Game();
 
     class Animation {
     public:
@@ -119,7 +121,6 @@ private:
     uint8_t m_new_game_animation_delay { 0 };
 
     uint32_t m_score { 0 };
-    Function<void(uint32_t)> m_on_score_update;
 };
 
 }

Userland/Games/Solitaire/Solitaire.gml

@@ -0,0 +1,10 @@
+@GUI::Widget {
+    fill_with_background_color: false
+
+    layout: @GUI::VerticalBoxLayout {
+    }
+
+    @Solitaire::Game {
+        name: "game"
+    }
+}

Userland/Games/Solitaire/main.cpp

@@ -5,6 +5,7 @@
  */
 
 #include "Game.h"
+#include <Games/Solitaire/SolitaireGML.h>
 #include <LibGUI/Action.h>
 #include <LibGUI/Application.h>
 #include <LibGUI/Icon.h>
@@ -39,15 +40,21 @@ int main(int argc, char** argv)
     window->set_resizable(false);
     window->resize(Solitaire::Game::width, Solitaire::Game::height);
 
-    auto widget = Solitaire::Game::construct([&](uint32_t score) {
+    auto& widget = window->set_main_widget<GUI::Widget>();
+    widget.load_from_gml(solitaire_gml);
+
+    auto& game = *widget.find_descendant_of_type_named<Solitaire::Game>("game");
+    game.set_focus(true);
+
+    game.on_score_update = [&](uint32_t score) {
         window->set_title(String::formatted("Score: {} - Solitaire", score));
-    });
+    };
 
     auto menubar = GUI::Menubar::construct();
     auto& game_menu = menubar->add_menu("&Game");
 
     game_menu.add_action(GUI::Action::create("&New Game", { Mod_None, Key_F2 }, [&](auto&) {
-        widget->setup();
+        game.setup();
     }));
     game_menu.add_separator();
     game_menu.add_action(GUI::CommonActions::make_quit_action([&](auto&) { app->quit(); }));
@@ -56,10 +63,9 @@ int main(int argc, char** argv)
     help_menu.add_action(GUI::CommonActions::make_about_action("Solitaire", app_icon, window));
 
     window->set_menubar(move(menubar));
-    window->set_main_widget(widget);
     window->set_icon(app_icon.bitmap_for_size(16));
     window->show();
-    widget->setup();
+    game.setup();
 
     return app->exec();
 }