自学教程：C++ GET_WHEEL_DELTA_WPARAM函数代码示例

	LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)	{        switch (msg)        {        case WM_SYSKEYDOWN:        {            if (wParam == VK_MENU)//ignore left alt stop            {            }            else                return DefWindowProc(hwnd, msg, wParam, lParam); // this makes ALT+F4 work            break;        }        case WM_CLOSE:        {            ShowWindow(hwnd, false);            PostQuitMessage(0);            break;        }        case WM_COMMAND:            break;        case WM_MOUSEWHEEL:        {            win32mouse->SetMouseWheel(GET_WHEEL_DELTA_WPARAM(wParam));            break;        }        case WM_INPUT:        {            UINT dwSize = 48; // 48 for 64bit build            static BYTE lpb[48];            GetRawInputData((HRAWINPUT)lParam, RID_INPUT,                lpb, &dwSize, sizeof(RAWINPUTHEADER)); // this gets relative coords            RAWINPUT* raw = (RAWINPUT*)lpb;            if (raw->header.dwType == RIM_TYPEMOUSE)            {                int xPosRelative = raw->data.mouse.lLastX;                int yPosRelative = raw->data.mouse.lLastY;                win32mouse->SetCursorDeltaRaw(xPosRelative, yPosRelative);            }            break;        }        default:            return DefWindowProc(hwnd, msg, wParam, lParam);        }        return 0;	}

//-----------------------------------------------------------------------------// Name: MsgProc()// Desc: The window's message handler//-----------------------------------------------------------------------------LRESULT WINAPI MsgProc( HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam ){    switch( msg )    {        case WM_DESTROY:            PostQuitMessage( 0 );            break;		case WM_SETCURSOR:			CGameInput::getSingletonPtr()->SetCursorIcon();			break;		case WM_CHAR:			printf( "WM_CHAR/n" );			CGameInput::getSingletonPtr()->InJectChar( wParam );			break;		case WM_KEYDOWN:			printf( "WM_KEYDOWN/n" );			CGameInput::getSingletonPtr()->KeyDown( wParam, lParam );			break;		case WM_KEYUP:			printf( "WM_KEYUP/n" );			CGameInput::getSingletonPtr()->KeyUp( wParam, lParam );			break;		case WM_LBUTTONDOWN:		case WM_LBUTTONDBLCLK:			CGameInput::getSingletonPtr()->SetMouseLBtn(0);			break;		case WM_LBUTTONUP:			CGameInput::getSingletonPtr()->SetMouseLBtn(1);			break;		case WM_RBUTTONDOWN:			CGameInput::getSingletonPtr()->SetMouseRBtn(0);			break;		case WM_RBUTTONUP:			CGameInput::getSingletonPtr()->SetMouseRBtn(1);			break;		case WM_MOUSEMOVE:			CGameInput::getSingletonPtr()->MouseMove( (int)LOWORD( lParam ), (int)HIWORD( lParam ) );			break;		case WM_MOUSEWHEEL:			CGameInput::getSingletonPtr()->SetMouseWheel( GET_WHEEL_DELTA_WPARAM( wParam ) );			break;		case WM_MOVE:			g_iWinX = (int)(short) LOWORD(lParam);   // horizontal position 			g_iWinY = (int)(short) HIWORD(lParam);   // vertical position 			break;    }    return DefWindowProc( hWnd, msg, wParam, lParam );}

LRESULT HubMessageControl::onMouseWheel(UINT /*uMsg*/, WPARAM wParam, LPARAM /*lParam*/, BOOL& /*bHandled*/) {  m_wheelAccumulator += GET_WHEEL_DELTA_WPARAM(wParam);  while (abs(m_wheelAccumulator) >= WHEEL_DELTA) {    const bool isNeg = m_wheelAccumulator < 0;    m_wheelAccumulator = abs(m_wheelAccumulator) - WHEEL_DELTA;    if (isNeg) {      if (m_wheelAccumulator != 0) m_wheelAccumulator = -m_wheelAccumulator;      SendMessage(WM_VSCROLL, SB_LINEDOWN);    }    else {      SendMessage(WM_VSCROLL, SB_LINEUP);    }  }  return 0;}

LRESULT CDangleWindowHex::DangleProc(UINT Msg,WPARAM wParam,LPARAM lParam){	//выбор по сообщению	switch(Msg)	{	case WM_KEYDOWN:		return OnKey(wParam),0;	case WM_COMMAND:		return OnCommand(LOWORD(wParam),HIWORD(wParam),(HWND)lParam),0;	case WM_MOUSEWHEEL:		return OnMouseWheel(GET_WHEEL_DELTA_WPARAM(wParam)/WHEEL_DELTA,GET_KEYSTATE_WPARAM(wParam)),0;	default:		return DefWindowProc(mhWindow,Msg,wParam,lParam);	}}

/*********************************************************************** * UPDOWN_MouseWheel * * Handle mouse wheel scrolling */static LRESULT UPDOWN_MouseWheel(UPDOWN_INFO *infoPtr, WPARAM wParam){    int iWheelDelta = GET_WHEEL_DELTA_WPARAM(wParam) / WHEEL_DELTA;    if (wParam & (MK_SHIFT | MK_CONTROL))        return 0;    if (iWheelDelta != 0)    {        UPDOWN_GetBuddyInt(infoPtr);        UPDOWN_DoAction(infoPtr, abs(iWheelDelta), iWheelDelta > 0 ? FLAG_INCR : FLAG_DECR);    }    return 1;}

void CGameMain::OnMouseWheel(const WPARAM& wParam, const LPARAM& lParam){	int delta = GET_WHEEL_DELTA_WPARAM(wParam);	eMouseKeyStateMask keyState = (eMouseKeyStateMask)GET_KEYSTATE_WPARAM(wParam);	///// 鼠标所在的屏幕坐标	int x = GET_X_LPARAM(lParam);	int y = GET_Y_LPARAM(lParam); //WHEEL_DELTA		static POINT pos;	pos.x = x;	pos.y = y;	::ScreenToClient(g_hWnd, &pos); ////--> 转化为客户区坐标	//printf("OnMouseWheel %d %d  (%d,%d) (%d,%d) /n", delta, keyState, x, y, pos.x, pos.y);	_gui.OnMouseWheel(x, y, delta, keyState);}

bool ExScrollBar::isPressed(unsigned int Sender, WPARAM wParam){	if (cState == INVISIBLE) return false;	switch (Sender) {	case WM_KEYDOWN:	{		switch (wParam)		{		case VK_UP:   {if (*sValue > sMin)    { *sValue = *sValue - 1; Update(); } return true; }		case VK_DOWN: {if (*sValue<sMax)    { *sValue = *sValue + 1; Update(); }  return true; }		case VK_PRIOR:{if (*sValue >= sMin + 5) { *sValue = *sValue - 5; Update(); } else if (*sValue>sMin) { *sValue = sMin; Update(); }  return true; } /*PGUP*/		case VK_NEXT: {if (*sValue <= sMax - 5) { *sValue = *sValue + 5; Update(); } else if (*sValue<sMax) { *sValue = sMax; Update(); }  return true; } /*PGDN*/		case VK_HOME: {if (*sValue>sMin)    { *sValue = sMin; Update(); }  return true; }		case VK_END:  {if (*sValue<sMax)    { *sValue = sMax; Update(); }  return true; }		}	}	case WM_MOUSEWHEEL:	{		if (GET_WHEEL_DELTA_WPARAM(wParam)>0)		{ if (*sValue > sMin)    { *sValue = *sValue - 1; Update(); } return true; }		else if (GET_WHEEL_DELTA_WPARAM(wParam) < 0)   { if (*sValue < sMax)    { *sValue = *sValue + 1; Update(); }  return true; }	}	}	return false;}

LRESULT CALLBACK Window::WindowProc(HWND Handle, unsigned int msg, WPARAM wParam, LPARAM lParam){	TwEventWin(Handle,msg,wParam,lParam);	switch (msg)	{		case WM_SYSCOMMAND:			{				if (wParam == SC_CLOSE)				{					PostMessage(Handle,WM_DESTROY,0,0);				}				break;			}		case WM_DESTROY:			{				PostQuitMessage(0);				break;			}		case WM_MOUSEWHEEL:			{				if(lcMouse::Get())					lcMouse::Get()->m_uiScrollVal = GET_WHEEL_DELTA_WPARAM(wParam);				break;			}		case WM_DROPFILES:			{				HDROP hDrop = (HDROP)wParam;				int iFileCount = DragQueryFile(hDrop,0xFFFFFFFF, nullptr, MAX_PATH);				for(int i = 0;i < iFileCount;++i)				{					char a_szFileDir[256];					DragQueryFile(hDrop,i,a_szFileDir,MAX_PATH);					m_pSingleton->OnDropFile(a_szFileDir);				}				DragFinish(hDrop);				break;			}		default:			return DefWindowProc(Handle,msg,wParam,lParam);	};	return 0;}

void customize_Scene::WndProc(HWND hWnd, UINT iMessage, WPARAM wParam, LPARAM lParam){	switch (iMessage)	{	case WM_MOUSEWHEEL:		Z -= (GET_WHEEL_DELTA_WPARAM(wParam) / 100);		if (Z < 0.5)			Z = 0.5f;		if (Z > 10)			Z = 10;					break;	}}

void CDataScope::OnMouseWheel(WPARAM wParam, LPARAM lParam){  INT nValue = GET_WHEEL_DELTA_WPARAM(wParam);  // Update scroll info  if (nValue > 0)  {    m_fXScale *= 0.9;  }  else  {    m_fXScale /= 0.9;  }  InvalidateRect(m_hWnd, NULL, TRUE);}

void WinInputManager::Run(UINT const & msg, WPARAM wParam, LPARAM lParam){    if (m_listenerList.empty())        return;    eKeyCodes KeyIndex;    wchar_t buffer[1];    BYTE lpKeyState[256];    CursorEvent();    switch (msg)    {    case WM_KEYDOWN:        KeyIndex = static_cast<eKeyCodes>(wParam);        GetKeyboardState(lpKeyState);        ToUnicode(wParam, HIWORD(lParam) & 0xFF, lpKeyState, buffer, 1, 0);        KeyEvent(KeyIndex, buffer[0], true);        break;    case WM_KEYUP:        KeyIndex = static_cast<eKeyCodes>(wParam);        GetKeyboardState(lpKeyState);        ToUnicode(wParam, HIWORD(lParam) & 0xFF, lpKeyState, buffer, 1, 0);        KeyEvent(KeyIndex, buffer[0], false);        break;    case WM_LBUTTONDOWN:        MouseEvent(MOUSE_LEFT, true);        break;    case WM_LBUTTONUP:        MouseEvent(MOUSE_LEFT, false);        break;    case WM_RBUTTONDOWN:        MouseEvent(MOUSE_RIGHT, true);        break;    case WM_RBUTTONUP:        MouseEvent(MOUSE_RIGHT, false);        break;    case WM_MBUTTONDOWN:        MouseEvent(MOUSE_MIDDLE, true);        break;    case WM_MBUTTONUP:        MouseEvent(MOUSE_MIDDLE, false);        break;    case WM_MOUSEWHEEL:        MouseWheelEvent((short)GET_WHEEL_DELTA_WPARAM(wParam) / WHEEL_DELTA);        break;    }}

VOID CInputManager::MessageProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam){	switch(message)	{	//滚轮消息	case WM_MOUSEWHEEL:		{			if(GET_WHEEL_DELTA_WPARAM(wParam)>0)			{				m_dwMouseFlag |= MOUSE_WHEELUP;			}			else			{				m_dwMouseFlag |= MOUSE_WHEELDOWN;			}		}		break;	//键盘按下	case WM_KEYDOWN:		{			//用来处理重复的键盘按下			m_Buf_WM_KEYDOWN = std::make_pair(wParam, lParam);			m_bCatchKeyDown = true;//			AxTrace(0, 2, "Push:%d", wParam);		}		break;	//鼠标	case WM_LBUTTONDBLCLK:	case WM_LBUTTONDOWN:	case WM_LBUTTONUP:	case WM_RBUTTONDOWN:	case WM_RBUTTONUP:	case WM_MOUSEMOVE:		{			m_ptMouseNow.x = GET_X_LPARAM(lParam); 			m_ptMouseNow.y = GET_Y_LPARAM(lParam); 		}		break;	//文字输入	case WM_CHAR:	case WM_IME_COMPOSITION:		CGameProcedure::s_pUISystem_->InjectInput_CHAR(hWnd, message, wParam, lParam);		break;	}}

IMGUI_API LRESULT ImGui_ImplDX10_WndProcHandler(HWND, UINT msg, WPARAM wParam, LPARAM lParam){    ImGuiIO& io = ImGui::GetIO();    switch (msg)    {    case WM_LBUTTONDOWN:        io.MouseDown[0] = true;        return true;    case WM_LBUTTONUP:        io.MouseDown[0] = false;        return true;    case WM_RBUTTONDOWN:        io.MouseDown[1] = true;        return true;    case WM_RBUTTONUP:        io.MouseDown[1] = false;        return true;    case WM_MBUTTONDOWN:        io.MouseDown[2] = true;        return true;    case WM_MBUTTONUP:        io.MouseDown[2] = false;        return true;    case WM_MOUSEWHEEL:        io.MouseWheel += GET_WHEEL_DELTA_WPARAM(wParam) > 0 ? +1.0f : -1.0f;        return true;    case WM_MOUSEMOVE:        io.MousePos.x = (signed short)(lParam);        io.MousePos.y = (signed short)(lParam >> 16);        return true;    case WM_KEYDOWN:        if (wParam < 256)            io.KeysDown[wParam] = 1;        return true;    case WM_KEYUP:        if (wParam < 256)            io.KeysDown[wParam] = 0;        return true;    case WM_CHAR:        // You can also use ToAscii()+GetKeyboardState() to retrieve characters.        if (wParam > 0 && wParam < 0x10000)            io.AddInputCharacter((unsigned short)wParam);        return true;    }    return 0;}

void HandleMouseScrollEvents(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam, LPSCROLLSTATE state){    SCROLLINFO si;    int Delta;    int NewPos;    si.cbSize = sizeof(si);    si.fMask = SIF_PAGE;    GetScrollInfo(hWnd, SB_VERT, &si);    if (Globals.uLinesToScroll == WHEEL_PAGESCROLL)    {        NewPos = si.nPage;    }    else    {        NewPos = Globals.uLinesToScroll * 5;    }    if (GET_WHEEL_DELTA_WPARAM(wParam) > 0)    {        NewPos = state->CurrentY - NewPos;    }    else    {        NewPos = state->CurrentY + NewPos;    }    NewPos = min(state->MaxY, max(0, NewPos));    if (NewPos == state->CurrentY)    {        return;    }    Delta = NewPos - state->CurrentY;    state->CurrentY = NewPos;    ScrollWindowEx(hWnd, 0, -Delta, NULL, NULL, NULL, NULL, SW_INVALIDATE);    si.cbSize = sizeof(si);    si.fMask = SIF_POS;    si.nPos = state->CurrentY;    SetScrollInfo(hWnd, SB_VERT, &si, TRUE);}

BOOL CMouseWheelMgr::OnMouseEx(UINT uMouseMsg, const MOUSEHOOKSTRUCTEX& info){	if (uMouseMsg == WM_MOUSEWHEEL)	{		HWND hwndPt = ::WindowFromPoint(info.pt);		int zDelta = GET_WHEEL_DELTA_WPARAM(info.mouseData);		if (info.hwnd != hwndPt)  // does the window under the mouse have the focus.		{			// modifier keys are not reported in MOUSEHOOKSTRUCTEX			// so we have to figure them out			WORD wKeys = 0;			if (GetKeyState(VK_CONTROL) & 0x8000)				wKeys |= MK_CONTROL;			if (GetKeyState(VK_SHIFT) & 0x8000)				wKeys |= MK_SHIFT;			if (GetKeyState(VK_LBUTTON) & 0x8000)				wKeys |= MK_LBUTTON;			if (GetKeyState(VK_RBUTTON) & 0x8000)				wKeys |= MK_RBUTTON;			if (GetKeyState(VK_MBUTTON) & 0x8000)				wKeys |= MK_MBUTTON;						::PostMessage(hwndPt, WM_MOUSEWHEEL, MAKEWPARAM(wKeys, zDelta), MAKELPARAM(info.pt.x, info.pt.y));			return TRUE; // eat		}		else // special cases not natively supporting mouse wheel		{			CString sClass = CWinClasses::GetClass(hwndPt);						if (CWinClasses::IsClass(sClass, WC_DATETIMEPICK) ||				CWinClasses::IsClass(sClass, WC_MONTHCAL))			{				::PostMessage(hwndPt, WM_KEYDOWN, zDelta > 0 ? VK_UP : VK_DOWN, 0L);			}		}	}		// all else	return FALSE;}

/*************************************************************//** * *  @brief  送信されたメッセ
C++ GET_WM_COMMAND_ID函数代码示例
C++ GET_VM函数代码示例