cpp-utility/Inputs.h at main · RaidcoreGG/cpp-utility · GitHub

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///----------------------------------------------------------------------------------------------------
/// Copyright (c) Raidcore.GG - All rights reserved.
///
/// Name         :  Inputs.h
/// Description  :  Contains a variety of utility for WndProc/Inputs.
/// Authors      :  K. Bieniek
///----------------------------------------------------------------------------------------------------

#pragma once

#include <cstdint>
#include <windows.h>

///----------------------------------------------------------------------------------------------------
/// EMouseButtons Enumeration
///----------------------------------------------------------------------------------------------------
enum class EMouseButtons
{
	None,
	LMB,
	RMB,
	MMB,
	M4,
	M5
};

///----------------------------------------------------------------------------------------------------
/// EModifiers Enumeration
///----------------------------------------------------------------------------------------------------
enum class EModifiers
{
	None  = 0,
	Shift = 1 << 0,
	Ctrl  = 1 << 1,
	Alt   = 1 << 2
};

#ifdef DEFINE_ENUM_FLAG_OPERATORS
DEFINE_ENUM_FLAG_OPERATORS(EModifiers);
#endif

///----------------------------------------------------------------------------------------------------
/// KeystrokeMessageFlags struct
///----------------------------------------------------------------------------------------------------
struct KeystrokeMessageFlags
{
	unsigned RepeatCount      : 16;
	unsigned ScanCode         : 8;
	unsigned ExtendedFlag     : 1;
	unsigned Reserved         : 4;
	unsigned ContextCode      : 1;
	unsigned PreviousKeyState : 1;
	unsigned TransitionState  : 1;

	///----------------------------------------------------------------------------------------------------
	/// GetScanCode:
	/// 	Returns the scancode (including extended key flag) of the LParam.
	///----------------------------------------------------------------------------------------------------
	inline uint16_t GetScanCode()
	{
		uint16_t ret = ScanCode;

		if (ExtendedFlag)
		{
			ret |= 0xE000;
		}

		return ret;
	}

	KeystrokeMessageFlags() = default;
	inline KeystrokeMessageFlags(LPARAM aLParam)
	{
		/* direct assignment is not possible, so we cast and then copy */
		KeystrokeMessageFlags tmp = *(KeystrokeMessageFlags*)&aLParam;

		RepeatCount      = tmp.RepeatCount;
		ScanCode         = tmp.ScanCode;
		ExtendedFlag     = tmp.ExtendedFlag;
		Reserved         = tmp.Reserved;
		ContextCode      = tmp.ContextCode;
		PreviousKeyState = tmp.PreviousKeyState;
		TransitionState  = tmp.TransitionState;
	}
};

///----------------------------------------------------------------------------------------------------
/// LParamToKMF:
/// 	Casts an LPARAM to a KeystrokeMessageFlags.
///----------------------------------------------------------------------------------------------------
inline KeystrokeMessageFlags& LParamToKMF(LPARAM& aLParam)
{
	return *(KeystrokeMessageFlags*)&aLParam;
}

///----------------------------------------------------------------------------------------------------
/// KMFToLParam:
/// 	Casts an KeystrokeMessageFlags to a LPARAM.
///----------------------------------------------------------------------------------------------------
inline LPARAM& KMFToLParam(KeystrokeMessageFlags& aKmf)
{
	return *(LPARAM*)&aKmf;
}

///----------------------------------------------------------------------------------------------------
/// GetKeyMessageLPARAM:
/// 	Creates an LPARAM for key messages.
///----------------------------------------------------------------------------------------------------
inline LPARAM GetKeyMessageLPARAM(unsigned aVKey, bool aIsDown, bool aIsSystem)
{
	KeystrokeMessageFlags lp;

	UINT sc = MapVirtualKeyA(aVKey, MAPVK_VK_TO_VSC_EX);

	lp.RepeatCount      = 1;
	lp.ScanCode         = LOBYTE(sc);
	lp.ExtendedFlag     = (HIBYTE(sc) == 0xE0 || HIBYTE(sc) == 0xE1) ? 1 : 0;
	lp.Reserved         = 0;
	lp.ContextCode      = aIsSystem ? 1 : 0;
	lp.PreviousKeyState = aIsDown ? 0 : 1;
	lp.TransitionState  = aIsDown ? 0 : 1;

	return KMFToLParam(lp);
}

///----------------------------------------------------------------------------------------------------
/// GetKeyMessageLPARAM_ScanCode:
/// 	Creates an LPARAM for key messages.
///----------------------------------------------------------------------------------------------------
inline LPARAM GetKeyMessageLPARAM_ScanCode(unsigned short aScanCode, bool aIsDown, bool aIsSystem)
{
	KeystrokeMessageFlags lp = GetKeyMessageLPARAM(0, aIsDown, aIsSystem);
	lp.ScanCode = LOBYTE(aScanCode);
	lp.ExtendedFlag = (HIBYTE(aScanCode) == 0xE0 || HIBYTE(aScanCode) == 0xE1) ? 1 : 0;
	return KMFToLParam(lp);
}

///----------------------------------------------------------------------------------------------------
/// GetMouseMessageWPARAM:
/// 	Creates an WPARAM for mouse messages.
///----------------------------------------------------------------------------------------------------
inline WPARAM GetMouseMessageWPARAM(EMouseButtons aMouseButton, bool aIsCtrl, bool aIsShift, bool aIsDown)
{
	int lo = 0;
	int ho = 0;

	switch (aMouseButton)
	{
		case EMouseButtons::LMB:
			lo = aIsDown ? MK_LBUTTON : 0;
			break;
		case EMouseButtons::RMB:
			lo = aIsDown ? MK_RBUTTON : 0;
			break;
		case EMouseButtons::MMB:
			lo = aIsDown ? MK_MBUTTON : 0;
			break;
		case EMouseButtons::M4:
			lo = aIsDown ? MK_XBUTTON1 : 0;
			ho = XBUTTON1;
			break;
		case EMouseButtons::M5:
			lo = aIsDown ? MK_XBUTTON2 : 0;
			ho = XBUTTON2;
			break;
	}

	return MAKEWPARAM(
		(
			(aIsCtrl ? MK_CONTROL : 0) |
			(aIsShift ? MK_SHIFT : 0) |
			(lo)
		),( (ho) )
	);
}

///----------------------------------------------------------------------------------------------------
/// Inputs Namespace
///----------------------------------------------------------------------------------------------------
namespace Inputs
{
	///----------------------------------------------------------------------------------------------------
	/// IsCursorHidden:
	/// 	Returns true if the cursor is hidden.
	///----------------------------------------------------------------------------------------------------
	inline bool IsCursorHidden()
	{
		CURSORINFO curInfo{};
		curInfo.cbSize = sizeof(CURSORINFO);
		GetCursorInfo(&curInfo);
		return !(curInfo.flags & CURSOR_SHOWING);
	}
}