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Source/Engine/Input/InputDevice.h

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+// Copyright (c) 2012-2020 Wojciech Figat. All rights reserved.
+
+#pragma once
+
+#include "Engine/Core/Math/Vector2.h"
+#include "Engine/Core/Collections/Array.h"
+#include "Engine/Scripting/ScriptingObject.h"
+#include "Enums.h"
+#include "KeyboardKeys.h"
+
+/// <summary>
+/// Base class for all input device objects.
+/// </summary>
+API_CLASS(Abstract, NoSpawn) class FLAXENGINE_API InputDevice : public PersistentScriptingObject
+{
+DECLARE_SCRIPTING_TYPE_NO_SPAWN(InputDevice);
+public:
+
+    enum class EventType
+    {
+        Char,
+        KeyDown,
+        KeyUp,
+        MouseDown,
+        MouseUp,
+        MouseDoubleClick,
+        MouseWheel,
+        MouseMove,
+        MouseLeave,
+        TouchDown,
+        TouchMove,
+        TouchUp,
+    };
+
+    struct Event
+    {
+        EventType Type;
+        Window* Target;
+
+        union
+        {
+            struct
+            {
+                Char Char;
+            } CharData;
+
+            struct
+            {
+                KeyboardKeys Key;
+            } KeyData;
+
+            struct
+            {
+                MouseButton Button;
+                Vector2 Position;
+            } MouseData;
+
+            struct
+            {
+                float WheelDelta;
+                Vector2 Position;
+            } MouseWheelData;
+
+            struct
+            {
+                Vector2 Position;
+                int32 PointerId;
+            } TouchData;
+        };
+
+        Event()
+        {
+        }
+
+        Event(const Event& e)
+        {
+            Platform::MemoryCopy(this, &e, sizeof(Event));
+        }
+    };
+
+    typedef Array<Event, InlinedAllocation<32>> EventQueue;
+
+protected:
+
+    String _name;
+    EventQueue _queue;
+
+    explicit InputDevice(const SpawnParams& params, const StringView& name)
+        : PersistentScriptingObject(params)
+        , _name(name)
+    {
+    }
+
+public:
+
+    /// <summary>
+    /// Gets the name.
+    /// </summary>
+    API_PROPERTY() FORCE_INLINE const String& GetName() const
+    {
+        return _name;
+    }
+
+    /// <summary>
+    /// Resets the input device state. Called when application looses focus.
+    /// </summary>
+    virtual void ResetState()
+    {
+        _queue.Clear();
+    }
+
+    /// <summary>
+    /// Captures the input since the last call and triggers the input events.
+    /// </summary>
+    /// <param name="queue">The input events queue.</param>
+    /// <returns>True if device has been disconnected, otherwise false.<returns>
+    virtual bool Update(EventQueue& queue)
+    {
+        if (UpdateState())
+            return true;
+        queue.Add(_queue);
+        _queue.Clear();
+        return false;
+    }
+
+    /// <summary>
+    /// Updates only the current state of the device.
+    /// </summary>
+    /// <returns>True if device has been disconnected, otherwise false.<returns>
+    virtual bool UpdateState()
+    {
+        return false;
+    }
+};