win/Keyboard.h

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/*
 * Copyright (c) Meta Platforms, Inc. and affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 */
 
#ifndef META_OCEAN_PLATFORM_WIN_KEYBOARD_H
#define META_OCEAN_PLATFORM_WIN_KEYBOARD_H
 
#include "ocean/platform/win/Win.h"
 
#include "ocean/platform/Keyboard.h"
 
namespace Ocean
{
 
namespace Platform
{
 
namespace Win
{
 
/**
 * This class implements keyboard functionalities.
 * @ingroup platformwin
 */
class OCEAN_PLATFORM_WIN_EXPORT Keyboard : Platform::Keyboard
{
    public:
 
        /**
         * Translates a virtual key code to the corresponsing character key and key description.
         * @param vKey Virtual key code to translate
         * @param key Resulting key character or name
         * @return True, if succeeded
         */
        static bool translateVirtualkey(const unsigned int vKey, std::string& key);
 
        /**
         * Returns whether all specified keys of the keyboard are currently pushed (down) or not.
         * @param keys The keys for that the states are requested (may be a combination of several keys)
         * @param synchron True, to request the state synchronously with the message queue; False, to request the state in the current moment
         * @return True, if so; also True if no key is provided
         */
        static bool allKeysDown(const Key keys, const bool synchron = true);
 
        /**
         * Returns whether at least one key of the specified keys of the keyboard is currently pushed (down) or not.
         * @param keys The keys for that the states are requested (may be a combination of several keys)
         * @param synchron True, to request the state synchronously with the message queue; False, to request the state in the current moment
         * @return True, if so; also True if no key is provided
         */
        static bool oneKeyDown(const Key keys, const bool synchron = true);
 
        /**
         * Returns wheater exactly one (specified key) is currently pushed (down) or not.
         * @param key One unique key for that the state is requested, must not be a combination of several keys
         * @param synchron True, to request the state synchronously with the message queue; False, to request the state in the current moment
         * @return True, if so
         */
        static bool isKeyDown(const Key key, const bool synchron = true);
 
        /**
         * Returns the current key state for the shift, control and menu keys.
         * This function does not distinguish between the left and a right key version.
         * @return Current key state
         */
        static Key currentKeyState(const bool synchron = true);
 
    protected:
 
        /**
         * Returns wheater exactly one (specified key) is currently pushed (down) or not.
         * @param nVirtualKey The virtual key code for that the state is requested
         * @param synchron True, to request the state synchronously with the message queue; False, to request the state in the current moment
         * @return True, if so
         */
        static inline bool keyState(const int nVirtualKey, const bool synchron);
};
 
inline bool Keyboard::keyState(const int nVirtualKey, const bool synchron)
{
    if (synchron)
    {
        // MSDN: If the high-order bit is 1, the key is down; otherwise, it is up
        return (GetKeyState(nVirtualKey) & 0xF0) != 0;
    }
    else
    {
        return GetAsyncKeyState(nVirtualKey) != 0;
    }
}
 
}
 
}
 
}
 
#endif // META_OCEAN_PLATFORM_WIN_KEYBOARD_H