From ced3d03bdb3ce866d832e03fb212865140905a9a Mon Sep 17 00:00:00 2001
From: Thomas Leyh <leyh.thomas@web.de>
Date: Sun, 24 Jul 2016 08:14:18 +0200
Subject: Add project files.

---
 V3/Input/Internal/InputManager.cs | 141 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 141 insertions(+)
 create mode 100644 V3/Input/Internal/InputManager.cs

(limited to 'V3/Input/Internal/InputManager.cs')

diff --git a/V3/Input/Internal/InputManager.cs b/V3/Input/Internal/InputManager.cs
new file mode 100644
index 0000000..8e6ce2e
--- /dev/null
+++ b/V3/Input/Internal/InputManager.cs
@@ -0,0 +1,141 @@
+using System.Collections.Generic;
+using Microsoft.Xna.Framework;
+using Microsoft.Xna.Framework.Input;
+using Ninject;
+
+namespace V3.Input.Internal
+{
+    /// <summary>
+    /// Watches the state of the mouse and keyboard and creates events if a
+    /// change (key pressed or released) is detected. To use this class, call
+    /// Update in every update round. After the update, you may access the
+    /// generated events in KeyEvents and MouseEvents. The input manager only
+    /// watches the mouse buttons and keys listed in sWatchedKeys and
+    /// sWatchedButtons.
+    /// </summary>
+    // ReSharper disable once ClassNeverInstantiated.Global
+    internal sealed class InputManager : IInputManager, IInitializable
+    {
+        /// <summary>
+        /// The key events that were generated during the last update. Reset
+        /// in the next update.
+        /// </summary>
+        public ICollection<IKeyEvent> KeyEvents { get; } = new HashSet<IKeyEvent>();
+        /// <summary>
+        /// The mouse events that were generated during the last update. Reset in
+        /// the next update.
+        /// </summary>
+        public ICollection<IMouseEvent> MouseEvents { get; } = new HashSet<IMouseEvent>();
+
+        private static readonly ICollection<Keys> sWatchedKeys = new List<Keys> { Keys.Enter, Keys.Escape, Keys.E, Keys.L, Keys.Q, Keys.S, Keys.F1, Keys.F2 , Keys.F3, Keys.F4, Keys.F5, Keys.F6, Keys.F7, Keys.F8 };
+
+        private static readonly ICollection<MouseButton> sWatchedButtons = new List<MouseButton> { MouseButton.Left, MouseButton.Right, MouseButton.Middle };
+
+        private readonly GraphicsDeviceManager mGraphicsDeviceManager;
+
+        private readonly IDictionary<Keys, KeyState> mKeyStates = new Dictionary<Keys, KeyState>();
+
+        private readonly IDictionary<MouseButton, ButtonState> mButtonStates = new Dictionary<MouseButton, ButtonState>();
+
+        private readonly IDictionary<MouseButton, Point?> mButtonPositions = new Dictionary<MouseButton, Point?>();
+
+        /// <summary>
+        /// Creates a new input manager.
+        /// </summary>
+        public InputManager(GraphicsDeviceManager graphicsDeviceManager)
+        {
+            mGraphicsDeviceManager = graphicsDeviceManager;
+        }
+
+        public void Initialize()
+        {
+            foreach (var key in sWatchedKeys)
+                mKeyStates.Add(key, KeyState.Up);
+            foreach (var button in sWatchedButtons)
+            {
+                mButtonStates.Add(button, ButtonState.Released);
+                mButtonPositions.Add(button, null);
+            }
+        }
+
+        /// <summary>
+        /// Updates the keyboard and mouse status and generates the key and mouse
+        /// events in KeyEvents and MouseEvents if changes were detected. Should
+        /// be called once every update, before doing something else.
+        /// </summary>
+        public void Update()
+        {
+            UpdateKeyboard();
+            UpdateMouse();
+        }
+
+        private void UpdateKeyboard()
+        {
+            KeyEvents.Clear();
+
+            var state = Keyboard.GetState();
+            foreach (var key in sWatchedKeys)
+            {
+                var newState = state[key];
+                if (newState != mKeyStates[key])
+                {
+                    mKeyStates[key] = newState;
+                    KeyEvents.Add(new KeyEvent(key, newState));
+                }
+            }
+        }
+
+        private void UpdateMouse()
+        {
+            MouseEvents.Clear();
+
+            var state = Mouse.GetState();
+            foreach (var button in sWatchedButtons)
+            {
+                var newState = GetButtonState(state, button);
+                if (newState != mButtonStates[button])
+                {
+                    var position = new Point(state.X, state.Y);
+                    var positionPressed = position;
+                    Point? positionReleased = null;
+                    if (newState == ButtonState.Released)
+                    {
+                        if (mButtonPositions[button].HasValue)
+                            positionPressed = mButtonPositions[button].Value;
+                        positionReleased = position;
+                    }
+
+                    mButtonStates[button] = newState;
+                    mButtonPositions[button] = position;
+
+                    var releasedOnScreen = false;
+                    if (positionReleased.HasValue)
+                        releasedOnScreen = IsPointOnScreen(positionReleased.Value);
+
+                    MouseEvents.Add(new MouseEvent(button, newState, positionPressed, positionReleased, releasedOnScreen));
+                }
+            }
+        }
+
+        private bool IsPointOnScreen(Point point)
+        {
+            var viewport = mGraphicsDeviceManager.GraphicsDevice.Viewport;
+            return point.X >= 0 && point.X <= viewport.Width && point.Y >= 0 && point.Y <= viewport.Height;
+        }
+
+        private static ButtonState GetButtonState(MouseState state, MouseButton button)
+        {
+            switch (button)
+            {
+                case MouseButton.Left:
+                    return state.LeftButton;
+                case MouseButton.Right:
+                    return state.RightButton;
+                case MouseButton.Middle:
+                    return state.MiddleButton;
+                default:
+                    return state.LeftButton;
+            }
+        }
+    }
+}
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