Start working on those top left buttons in the UI draft.

Content.Client/EntryPoint.cs

@@ -133,6 +133,7 @@ namespace Content.Client
             factory.RegisterIgnore("AiController");
             factory.RegisterIgnore("PlayerInputMover");
 
+            IoCManager.Register<IGameHud, GameHud>();
             IoCManager.Register<IClientNotifyManager, ClientNotifyManager>();
             IoCManager.Register<ISharedNotifyManager, ClientNotifyManager>();
             IoCManager.Register<IClientGameTicker, ClientGameTicker>();
@@ -198,6 +199,7 @@ namespace Content.Client
             IoCManager.Resolve<IClientGameTicker>().Initialize();
             IoCManager.Resolve<IOverlayManager>().AddOverlay(new ParallaxOverlay());
             IoCManager.Resolve<IChatManager>().Initialize();
+            IoCManager.Resolve<IGameHud>().Initialize();
         }
 
         public override void Update(ModUpdateLevel level, float frameTime)

Content.Client/EscapeMenuOwner.cs

@@ -9,6 +9,7 @@ using Robust.Shared.Input;
 using Robust.Shared.Interfaces.Configuration;
 using Robust.Shared.Interfaces.Map;
 using Robust.Shared.IoC;
+using Robust.Shared.Players;
 using Robust.Shared.Prototypes;
 
 namespace Content.Client
@@ -16,14 +17,15 @@ namespace Content.Client
     internal sealed class EscapeMenuOwner : IEscapeMenuOwner
     {
 #pragma warning disable 649
-        [Dependency] private readonly IStateManager _stateManager;
         [Dependency] private readonly IClientConsole _clientConsole;
-        [Dependency] private readonly ITileDefinitionManager _tileDefinitionManager;
+        [Dependency] private readonly IConfigurationManager _configurationManager;
+        [Dependency] private readonly IInputManager _inputManager;
         [Dependency] private readonly IPlacementManager _placementManager;
         [Dependency] private readonly IPrototypeManager _prototypeManager;
         [Dependency] private readonly IResourceCache _resourceCache;
-        [Dependency] private readonly IConfigurationManager _configurationManager;
-        [Dependency] private readonly IInputManager _inputManager;
+        [Dependency] private readonly IStateManager _stateManager;
+        [Dependency] private readonly ITileDefinitionManager _tileDefinitionManager;
+        [Dependency] private readonly IGameHud _gameHud;
 #pragma warning restore 649
 
         private EscapeMenu _escapeMenu;
@@ -31,6 +33,8 @@ namespace Content.Client
         public void Initialize()
         {
             _stateManager.OnStateChanged += StateManagerOnOnStateChanged;
+
+            _gameHud.EscapeButtonToggled += _setOpenValue;
         }
 
         private void StateManagerOnOnStateChanged(StateChangedEventArgs obj)
@@ -44,26 +48,11 @@ namespace Content.Client
                     Visible = false
                 };
 
+                _escapeMenu.OnClose += () => _gameHud.EscapeButtonDown = false;
+
                 _escapeMenu.AddToScreen();
 
-                var escapeMenuCommand = InputCmdHandler.FromDelegate(session =>
-                {
-                    if (_escapeMenu.Visible)
-                    {
-                        if (_escapeMenu.IsAtFront())
-                        {
-                            _escapeMenu.Visible = false;
-                        }
-                        else
-                        {
-                            _escapeMenu.MoveToFront();
-                        }
-                    }
-                    else
-                    {
-                        _escapeMenu.OpenCentered();
-                    }
-                });
+                var escapeMenuCommand = InputCmdHandler.FromDelegate(Enabled);
 
                 _inputManager.SetInputCommand(EngineKeyFunctions.EscapeMenu, escapeMenuCommand);
             }
@@ -76,6 +65,39 @@ namespace Content.Client
                 _inputManager.SetInputCommand(EngineKeyFunctions.EscapeMenu, null);
             }
         }
+
+        private void Enabled(ICommonSession session)
+        {
+            if (_escapeMenu.Visible)
+            {
+                if (_escapeMenu.IsAtFront())
+                {
+                    _setOpenValue(false);
+                }
+                else
+                {
+                    _escapeMenu.MoveToFront();
+                }
+            }
+            else
+            {
+                _setOpenValue(true);
+            }
+        }
+
+        private void _setOpenValue(bool value)
+        {
+            if (value)
+            {
+                _gameHud.EscapeButtonDown = true;
+                _escapeMenu.OpenCentered();
+            }
+            else
+            {
+                _gameHud.EscapeButtonDown = false;
+                _escapeMenu.Visible = false;
+            }
+        }
     }
 
     public interface IEscapeMenuOwner

Content.Client/GameTicking/ClientGameTicker.cs

@@ -35,6 +35,7 @@ namespace Content.Client.GameTicking
         [Dependency] private ILocalizationManager _localization;
         [Dependency] private IResourceCache _resourceCache;
         [Dependency] private IPlayerManager _playerManager;
+        [Dependency] private IGameHud _gameHud;
 #pragma warning restore 649
 
         [ViewVariables] private bool _areWeReady;
@@ -177,6 +178,8 @@ namespace Content.Client.GameTicking
                 _tutorialButton = null;
             }
 
+            _gameHud.RootControl?.Parent.RemoveChild(_gameHud.RootControl);
+
             _tickerState = TickerState.InLobby;
 
             _lobby = new LobbyGui(_localization, _resourceCache);
@@ -248,6 +251,7 @@ namespace Content.Client.GameTicking
 
             _gameChat = new ChatBox();
             _userInterfaceManager.StateRoot.AddChild(_gameChat);
+            _userInterfaceManager.StateRoot.AddChild(_gameHud.RootControl);
             _chatManager.SetChatBox(_gameChat);
             _tutorialButton = new TutorialButton();
             _userInterfaceManager.StateRoot.AddChild(_tutorialButton);

Content.Client/Interfaces/IClientGameTicker.cs

@@ -1,3 +1,4 @@
+using Content.Client.UserInterface;
 using Robust.Client;
 
 namespace Content.Client.Interfaces

Content.Client/UserInterface/GameHud.cs

@@ -0,0 +1,65 @@
+using System;
+using Content.Client.Utility;
+using Robust.Client.Interfaces.ResourceManagement;
+using Robust.Client.UserInterface;
+using Robust.Client.UserInterface.Controls;
+using Robust.Shared.IoC;
+using Robust.Shared.Localization;
+
+namespace Content.Client.UserInterface
+{
+    public interface IGameHud
+    {
+        Control RootControl { get; }
+
+        bool EscapeButtonDown { get; set; }
+        Action<bool> EscapeButtonToggled { get; set; }
+        void Initialize();
+    }
+
+    /// <summary>
+    ///     Responsible for laying out the default game HUD.
+    /// </summary>
+    internal sealed class GameHud : IGameHud
+    {
+        public const string StyleClassTopMenuButton = "topMenuButton";
+
+        private TextureButton _buttonEscapeMenu;
+
+#pragma warning disable 649
+        [Dependency] private readonly IResourceCache _resourceCache;
+        [Dependency] private readonly ILocalizationManager _localizationManager;
+#pragma warning restore 649
+
+        public void Initialize()
+        {
+            RootControl = new Control();
+
+            RootControl.SetAnchorPreset(Control.LayoutPreset.Wide);
+
+            _buttonEscapeMenu = new TextureButton
+            {
+                TextureNormal = _resourceCache.GetTexture("/Textures/UserInterface/hamburger.svg.96dpi.png"),
+                ToggleMode = true,
+                ToolTip = _localizationManager.GetString("Open escape menu.")
+            };
+
+            _buttonEscapeMenu.OnToggled += args => { EscapeButtonToggled?.Invoke(args.Pressed); };
+
+            _buttonEscapeMenu.AddStyleClass(StyleClassTopMenuButton);
+
+            RootControl.AddChild(_buttonEscapeMenu);
+            _buttonEscapeMenu.SetAnchorAndMarginPreset(Control.LayoutPreset.TopLeft, margin: 20);
+        }
+
+        public Control RootControl { get; private set; }
+
+        public bool EscapeButtonDown
+        {
+            get => _buttonEscapeMenu.Pressed;
+            set => _buttonEscapeMenu.Pressed = value;
+        }
+
+        public Action<bool> EscapeButtonToggled { get; set; }
+    }
+}

Content.Client/UserInterface/NanoStyle.cs

@@ -441,6 +441,22 @@ namespace Content.Client.UserInterface
                 {
                     new StyleProperty(Label.StylePropertyFontColor, new Color(0.024f, 0.8f, 0.0f))
                 }),
+
+                // Those buttons on the top left.
+                new StyleRule(new SelectorElement(typeof(TextureButton), new []{GameHud.StyleClassTopMenuButton}, null, TextureButton.StylePseudoClassNormal), new []
+                {
+                    new StyleProperty(Control.StylePropertyModulateSelf, Color.FromHex("#7b7e9e"))
+                }),
+
+                new StyleRule(new SelectorElement(typeof(TextureButton), new []{GameHud.StyleClassTopMenuButton}, null, TextureButton.StylePseudoClassHover), new []
+                {
+                    new StyleProperty(Control.StylePropertyModulateSelf, Color.FromHex("#8285a3"))
+                }),
+
+                new StyleRule(new SelectorElement(typeof(TextureButton), new []{GameHud.StyleClassTopMenuButton}, null, TextureButton.StylePseudoClassPressed), new []
+                {
+                    new StyleProperty(Control.StylePropertyModulateSelf, Color.FromHex("#00b061"))
+                }),
             });
         }
     }

Resources/Textures/UserInterface/hamburger.svg

@@ -0,0 +1,85 @@
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+
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+   xmlns:dc="http://purl.org/dc/elements/1.1/"
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+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
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+   height="7.1438789mm"
+   viewBox="0 0 7.9563375 7.1438789"
+   version="1.1"
+   id="svg4593"
+   sodipodi:docname="hamburger.svg"
+   inkscape:export-filename="/home/pj/Projects/space-station-14-content/Resources/Textures/UserInterface/hamburger.svg.96dpi.png"
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+        <dc:title></dc:title>
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