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Source/Editor/States/EditorStateMachine.cs

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+// Copyright (c) 2012-2020 Wojciech Figat. All rights reserved.
+
+using System.Collections.Generic;
+using FlaxEngine;
+using FlaxEngine.Utilities;
+
+namespace FlaxEditor.States
+{
+    /// <summary>
+    /// Flax Editor states machine.
+    /// </summary>
+    /// <seealso cref="FlaxEngine.Utilities.StateMachine" />
+    [HideInEditor]
+    public sealed class EditorStateMachine : StateMachine
+    {
+        private readonly Queue<EditorState> _pendingStates = new Queue<EditorState>();
+
+        /// <summary>
+        /// Gets the current state.
+        /// </summary>
+        public new EditorState CurrentState => currentState as EditorState;
+
+        /// <summary>
+        /// Checks if editor is in playing mode
+        /// </summary>
+        public bool IsPlayMode => CurrentState == PlayingState;
+
+        /// <summary>
+        /// Checks if editor is in editing mode
+        /// </summary>
+        public bool IsEditMode => CurrentState == EditingSceneState;
+
+        /// <summary>
+        /// Editor loading state.
+        /// </summary>
+        public readonly LoadingState LoadingState;
+
+        /// <summary>
+        /// Editor closing state.
+        /// </summary>
+        public readonly ClosingState ClosingState;
+
+        /// <summary>
+        /// Editor editing scene state.
+        /// </summary>
+        public readonly EditingSceneState EditingSceneState;
+
+        /// <summary>
+        /// Editor changing scenes state.
+        /// </summary>
+        public readonly ChangingScenesState ChangingScenesState;
+
+        /// <summary>
+        /// Editor playing state.
+        /// </summary>
+        public readonly PlayingState PlayingState;
+
+        /// <summary>
+        /// Editor reloading scripts state.
+        /// </summary>
+        public readonly ReloadingScriptsState ReloadingScriptsState;
+
+        /// <summary>
+        /// Editor building lighting state.
+        /// </summary>
+        public readonly BuildingLightingState BuildingLightingState;
+
+        /// <summary>
+        /// Editor building scenes data state.
+        /// </summary>
+        public readonly BuildingScenesState BuildingScenesState;
+
+        internal EditorStateMachine(Editor editor)
+        {
+            // Register all in-build states
+            AddState(LoadingState = new LoadingState(editor));
+            AddState(ClosingState = new ClosingState(editor));
+            AddState(EditingSceneState = new EditingSceneState(editor));
+            AddState(ChangingScenesState = new ChangingScenesState(editor));
+            AddState(PlayingState = new PlayingState(editor));
+            AddState(ReloadingScriptsState = new ReloadingScriptsState(editor));
+            AddState(BuildingLightingState = new BuildingLightingState(editor));
+            AddState(BuildingScenesState = new BuildingScenesState(editor));
+
+            // Set initial state
+            GoToState(LoadingState);
+        }
+
+        internal void Update()
+        {
+            // Changing states
+            while (_pendingStates.Count > 0)
+            {
+                GoToState(_pendingStates.Dequeue());
+            }
+
+            // State update
+            if (CurrentState != null)
+            {
+                CurrentState.Update();
+                CurrentState.UpdateFPS();
+            }
+        }
+
+        /// <inheritdoc />
+        protected override void SwitchState(State nextState)
+        {
+            Editor.Log($"Changing editor state from {currentState} to {nextState}");
+
+            base.SwitchState(nextState);
+        }
+    }
+}