From ff1ae0f5ed7b6d5618ad256312f6be4416a64b26 Mon Sep 17 00:00:00 2001
From: Wojciech Figat <wojtek@figat.pl>
Date: Mon, 22 Nov 2021 17:07:57 +0100
Subject: [PATCH] Add `F11` shortcut to maximize Game window during play-mode
 in Editor

---
 Source/Editor/GUI/Docking/DockWindow.cs      | 17 +++++--
 Source/Editor/GUI/Docking/MasterDockPanel.cs |  2 +-
 Source/Editor/Windows/GameWindow.cs          | 53 +++++++++++++++++++-
 3 files changed, 65 insertions(+), 7 deletions(-)

diff --git a/Source/Editor/GUI/Docking/DockWindow.cs b/Source/Editor/GUI/Docking/DockWindow.cs
index 257518ecf..a847a7ff4 100644
--- a/Source/Editor/GUI/Docking/DockWindow.cs
+++ b/Source/Editor/GUI/Docking/DockWindow.cs
@@ -169,21 +169,30 @@ namespace FlaxEditor.GUI.Docking
         /// <param name="position">Window location.</param>
         public void ShowFloating(Vector2 size, WindowStartPosition position = WindowStartPosition.CenterParent)
         {
-            // Undock
+            ShowFloating(new Vector2(200, 200), size, position);
+        }
+
+        /// <summary>
+        /// Shows the window in a floating state.
+        /// </summary>
+        /// <param name="location">Window location.</param>
+        /// <param name="size">Window size, set Vector2.Zero to use default.</param>
+        /// <param name="position">Window location.</param>
+        public void ShowFloating(Vector2 location, Vector2 size, WindowStartPosition position = WindowStartPosition.CenterParent)
+        {
             Undock();
 
             // Create window
             var winSize = size.LengthSquared > 4 ? size : DefaultSize;
-            var window = FloatWindowDockPanel.CreateFloatWindow(_masterPanel.Root, new Vector2(200, 200), winSize, position, _title);
+            var window = FloatWindowDockPanel.CreateFloatWindow(_masterPanel.Root, location, winSize, position, _title);
             var windowGUI = window.GUI;
 
             // Create dock panel for the window
             var dockPanel = new FloatWindowDockPanel(_masterPanel, windowGUI);
             dockPanel.DockWindowInternal(DockState.DockFill, this);
 
-            Visible = true;
-
             // Perform layout
+            Visible = true;
             windowGUI.UnlockChildrenRecursive();
             windowGUI.PerformLayout();
 
diff --git a/Source/Editor/GUI/Docking/MasterDockPanel.cs b/Source/Editor/GUI/Docking/MasterDockPanel.cs
index 0293ec0cc..b274b6aab 100644
--- a/Source/Editor/GUI/Docking/MasterDockPanel.cs
+++ b/Source/Editor/GUI/Docking/MasterDockPanel.cs
@@ -132,7 +132,7 @@ namespace FlaxEditor.GUI.Docking
         public override DockState TryGetDockState(out float splitterValue)
         {
             splitterValue = 0.5f;
-            return DockState.Unknown;
+            return DockState.DockFill;
         }
     }
 }
diff --git a/Source/Editor/Windows/GameWindow.cs b/Source/Editor/Windows/GameWindow.cs
index 1e65c9b4a..91296d845 100644
--- a/Source/Editor/Windows/GameWindow.cs
+++ b/Source/Editor/Windows/GameWindow.cs
@@ -20,7 +20,10 @@ namespace FlaxEditor.Windows
         private readonly GameRoot _guiRoot;
         private bool _showGUI = true;
         private bool _showDebugDraw = false;
+        private bool _isMaximized = false;
         private float _gameStartTime;
+        private GUI.Docking.DockState _maximizeRestoreDockState;
+        private GUI.Docking.DockPanel _maximizeRestoreDockTo;
 
         /// <summary>
         /// Gets the viewport.
@@ -52,6 +55,41 @@ namespace FlaxEditor.Windows
             set => _showDebugDraw = value;
         }
 
+        /// <summary>
+        /// Gets or sets a value indicating whether game window is maximized (only in play mode).
+        /// </summary>
+        private bool IsMaximized
+        {
+            get => _isMaximized;
+            set
+            {
+                if (_isMaximized == value)
+                    return;
+                _isMaximized = value;
+                if (value)
+                {
+                    // Maximize
+                    _maximizeRestoreDockTo = _dockedTo;
+                    _maximizeRestoreDockState = _dockedTo.TryGetDockState(out _);
+                    if (_maximizeRestoreDockState != GUI.Docking.DockState.Float)
+                    {
+                        var monitorBounds = Platform.GetMonitorBounds(PointToScreen(Size * 0.5f));
+                        ShowFloating(monitorBounds.Location + new Vector2(200, 200), Vector2.Zero, WindowStartPosition.Manual);
+                    }
+                    if (!RootWindow.IsMaximized)
+                        RootWindow.Maximize();
+                }
+                else
+                {
+                    // Restore
+                    RootWindow.Restore();
+                    if (_maximizeRestoreDockTo != null && _maximizeRestoreDockTo.IsDisposing)
+                        _maximizeRestoreDockTo = null;
+                    Show(_maximizeRestoreDockState, _maximizeRestoreDockTo);
+                }
+            }
+        }
+
         /// <summary>
         /// Gets or sets a value indicating whether center mouse position on window focus in play mode. Helps when working with games that lock mouse cursor.
         /// </summary>
@@ -290,6 +328,13 @@ namespace FlaxEditor.Windows
         {
             _gameStartTime = Time.UnscaledGameTime;
         }
+        
+        /// <inheritdoc />
+        public override void OnPlayEnd()
+        {
+            IsMaximized = false;
+            Cursor = CursorType.Default;
+        }
 
         /// <inheritdoc />
         public override void OnShowContextMenu(ContextMenu menu)
@@ -442,16 +487,20 @@ namespace FlaxEditor.Windows
                 Screenshot.Capture(string.Empty);
                 return true;
             case KeyboardKeys.F11:
-            {
                 if (Root.GetKey(KeyboardKeys.Shift))
                 {
                     // Unlock mouse in game mode
                     UnlockMouseInPlay();
                     return true;
                 }
+                else if (Editor.IsPlayMode)
+                {
+                    // Maximized game window toggle
+                    IsMaximized = !IsMaximized;
+                    return true;
+                }
                 break;
             }
-            }
 
             // Prevent closing the game window tab during a play session
             if (Editor.StateMachine.IsPlayMode && Editor.Options.Options.Input.CloseTab.Process(this, key))