Clean up input handling in VulkanViewer

tools/vulkan/viewer/InputHandler.h

-/*
-* Copyright 2016 Google Inc.
-*
-* Use of this source code is governed by a BSD-style license that can be
-* found in the LICENSE file.
-*/
-
-#ifndef InputHandler_DEFINED
-#define InputHandler_DEFINED
-
-#include <string.h>
-
-class InputHandler
-{
-public:
-    InputHandler();
-
-    void onKeyDown(unsigned char key);                  // Handle key down event
-    void onKeyUp(unsigned char key);                    // Handle key up event
-    void onMouseDown(unsigned int h, unsigned int v);   // Handle mouse down event
-    void onMouseUp();                                   // Handle mouse up event
-
-    bool isKeyDown(unsigned char key) const { 
-        return fKeys[key]; 
-    }
-    bool isKeyUp(unsigned char key) const { 
-        return !fKeys[key]; 
-    }
-    bool isKeyPressed(unsigned char key) const {
-        return fKeyPressed[key];
-    }
-
-    bool isKeyReleased(unsigned char key) const {
-        return fKeyReleased[key];
-    }
-
-    bool isMouseDown(unsigned int* h, unsigned int* v) const {
-        if (fMouseDown)
-        {
-            *h = fMouseX; 
-            *v = fMouseY;
-            return true;
-        }
-        return false;
-    }
-
-    bool isMousePressed(unsigned int* h, unsigned int* v) const {
-        if (fMousePressed)
-        {
-            *h = fMouseX; 
-            *v = fMouseY;
-            return true;
-        }
-        return false;
-    }
-
-    bool IsMouseReleased() const {
-        return fMouseReleased;
-    }
-
-    inline void Update() {
-        memset(fKeyPressed, 0, sizeof(bool) * 256);
-        memset(fKeyReleased, 0, sizeof(bool) * 256);
-        fMousePressed = false;
-        fMouseReleased = false;
-    }
-
-private:
-    // assumes ASCII keystrokes only
-    bool fKeys[256];            
-    bool fKeyPressed[256];
-    bool fKeyReleased[256];
-
-    bool fMouseDown;
-    bool fMousePressed;
-    bool fMouseReleased;
-    unsigned int fMouseX;
-    unsigned int fMouseY;
-
-    InputHandler(const InputHandler& other);
-    InputHandler& operator=(const InputHandler& other);
-};
-
-#endif