DuiLib : Process WM_MOUSEWHEEL

在DuiLib中, 无法在HandleMessage中截获到 WM_MOUSEWHEEL.

在DuiLib中看到,  WM_MOUSEWHEEL处理已经是虚函数了.

当对话框 从 WindowImplBase 继承来时, 可以直接重载虚函数 OnMouseWheel

virtual LRESULT OnMouseWheel(UINT /*uMsg*/, WPARAM /*wParam*/, LPARAM /*lParam*/, BOOL& bHandled);

LRESULT xxDlg::OnMouseWheel(UINT /*uMsg*/, WPARAM /*wParam*/, LPARAM /*lParam*/, BOOL& bHandled){bHandled = FALSE;return 0;}

处理了这个虚函数，在窗体内，任意位置滚动鼠标滚轮， 都可以直接模拟滑动条消息的处理.

LRESULT CxxDlg::OnMouseWheel(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled){    std::wstring    strMsg = L"";    WORD fwKeys = GET_KEYSTATE_WPARAM(wParam);    WORD zDelta = GET_WHEEL_DELTA_WPARAM(wParam);    WORD xPos = GET_X_LPARAM(lParam);     WORD yPos = GET_Y_LPARAM(lParam);    strMsg = ns_base::StringFormatV(L"fwKeys = 0x%X, zDelta = 0x%X, xPos = 0x%X, yPos = 0x%X\r\n",        fwKeys,        zDelta,        xPos,         yPos);    OutputDebugStringW(strMsg.c_str());    WriteLog(L"OnMouseWheel : %s", strMsg.c_str());    bHandled = FALSE;    return 0;}

/// 在同一位置向下滚轮OnMouseWheel : fwKeys = 0x0, zDelta = 0xFF88, xPos = 0x46B, yPos = 0x15EOnMouseWheel : fwKeys = 0x0, zDelta = 0xFF88, xPos = 0x46B, yPos = 0x15EOnMouseWheel : fwKeys = 0x0, zDelta = 0xFF88, xPos = 0x46B, yPos = 0x15E/// 在同一位置向上滚轮OnMouseWheel : fwKeys = 0x0, zDelta = 0x78, xPos = 0x46B, yPos = 0x15EOnMouseWheel : fwKeys = 0x0, zDelta = 0x78, xPos = 0x46B, yPos = 0x15EOnMouseWheel : fwKeys = 0x0, zDelta = 0x78, xPos = 0x46B, yPos = 0x15EOnMouseWheel : fwKeys = 0x0, zDelta = 0x78, xPos = 0x46B, yPos = 0x15E/// 可以看出 zDelta的高字节，代表滚轮方向

LRESULT CxxDlg::OnMouseWheel(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled){                int iValueNew = 0;    int iValueRange = (m_pProgress->GetMaxValue() - m_pProgress->GetMinValue());    int iValueRc = m_pProgress->GetValue();    WORD fwKeys = GET_KEYSTATE_WPARAM(wParam);    WORD zDelta = GET_WHEEL_DELTA_WPARAM(wParam);    WORD xPos = GET_X_LPARAM(lParam);     WORD yPos = GET_Y_LPARAM(lParam);    if ((zDelta & 0xff00) > 0)        iValueNew = ((iValueRc + 1) > m_pProgress->GetMaxValue()) ? iValueRc : (iValueRc + 1);    else        iValueNew = ((iValueRc - 1) < m_pProgress->GetMinValue()) ? iValueRc : (iValueRc - 1);    m_pProgress->SetValue(iValueNew);    m_PaintManager.SendNotify(m_pProgress, DUI_MSGTYPE_VALUECHANGED);    bHandled = TRUE;    return 0;}

void    CxxDlg::Notify(TNotifyUI & msg){    if (msg.pSender == m_pProgress)    {        if (msg.sType == DUI_MSGTYPE_VALUECHANGED)        {            SliderPosChange();            /// do task when Slider bar position was changed        }    }    return __super::Notify(msg);}