1回顾通常的sdk窗口程序流程：注册窗口-创建窗口-显示窗口-启动消息循环

1.1注册窗口类

Duilib中最平凡的真实窗口类是：CWindowWnd，关于窗口注册提供了两个函数，严格的说应该是几个：

RegisterWindowClass()

RegisterSuperclass()

GetWindowClassName()

GetSuperClassName()

GetClassStyle()

在我的理解中，后面两个虚函数的意义应该是：上面这些接口分两组，一组是用于正常注册使用，一组用于扩展。

使用的时候用自定义的窗口对象从CWindowWnd继承下来，然后定制自己需要的window class

1.2创建窗口

    CGameFrameWnd* pFrame = new CGameFrameWnd();
    if( pFrame == NULL ) return 0;
    pFrame->Create(NULL, _T(""), UI_WNDSTYLE_FRAME, 0L, 0, 0, 1024, 738);

CWindowWnd带有mfc CWnd类似的Create接口用于创建窗口，同事注册窗口类也通过虚函数的方式延后到子类实现，super机制（如果有super优先注册）也带进来。

    if( GetSuperClassName() != NULL && !RegisterSuperclass() ) return NULL;
    if( GetSuperClassName() == NULL && !RegisterWindowClass() ) return NULL;

1.3显示窗口

和sdk是一样的

::ShowWindow(*pFrame, SW_SHOWMAXIMIZED);

.csharpcode, .csharpcode pre { font-size: small; color: black; font-family: consolas, "Courier New", courier, monospace; background-color: #ffffff; /*white-space: pre;*/ } .csharpcode pre { margin: 0em; } .csharpcode .rem { color: #008000; } .csharpcode .kwrd { color: #0000ff; } .csharpcode .str { color: #006080; } .csharpcode .op { color: #0000c0; } .csharpcode .preproc { color: #cc6633; } .csharpcode .asp { background-color: #ffff00; } .csharpcode .html { color: #800000; } .csharpcode .attr { color: #ff0000; } .csharpcode .alt { background-color: #f4f4f4; width: 100%; margin: 0em; } .csharpcode .lnum { color: #606060; } 1.4消息循环

CPaintManagerUI::MessageLoop();

1.5消息回调函数

在窗口类注册的时候应该要注册窗口回调函数指针，Duilib中默认是在CWindowWnd::RegisterWindow注册：

bool CWindowWnd::RegisterWindowClass()
{
    WNDCLASS wc = { 0 };
    wc.style = GetClassStyle();
    wc.cbClsExtra = 0;
    wc.cbWndExtra = 0;
    wc.hIcon = NULL;
    wc.lpfnWndProc = CWindowWnd::__WndProc;

__WndProc是CWindowWnd的一个静态成员，这个函数值得看一下：

LRESULT CALLBACK CWindowWnd::__WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
    CWindowWnd* pThis = NULL;
    if( uMsg == WM_NCCREATE ) {
        LPCREATESTRUCT lpcs = reinterpret_cast<LPCREATESTRUCT>(lParam);
        pThis = static_cast<CWindowWnd*>(lpcs->lpCreateParams);
        pThis->m_hWnd = hWnd;
        ::SetWindowLongPtr(hWnd, GWLP_USERDATA, reinterpret_cast<LPARAM>(pThis));
    } 
    else {
        pThis = reinterpret_cast<CWindowWnd*>(::GetWindowLongPtr(hWnd, GWLP_USERDATA));
        if( uMsg == WM_NCDESTROY && pThis != NULL ) {
            LRESULT lRes = ::CallWindowProc(pThis->m_OldWndProc, hWnd, uMsg, wParam, lParam);
            ::SetWindowLongPtr(pThis->m_hWnd, GWLP_USERDATA, 0L);
            if( pThis->m_bSubclassed ) pThis->Unsubclass();
            pThis->m_hWnd = NULL;
            pThis->OnFinalMessage(hWnd);
            return lRes;
        }
    }
    if( pThis != NULL ) {
        return pThis->HandleMessage(uMsg, wParam, lParam);
    } 
    else {
        return ::DefWindowProc(hWnd, uMsg, wParam, lParam);
    }
}

针对WM_NCCREATE这个消息有一个管用技巧，先复习下这个消息：

The WM_NCCREATE message is sent prior to the WM_CREATE message when a window is first created.

我的理解中，这个消息应该是窗口收到的第一个消息。

还有WM_NCDESTROY这个特殊的消息。

当然了，还有这个牛逼的戏法：

::SetWindowLongPtr(hWnd, GWLP_USERDATA, reinterpret_cast<LPARAM>(pThis));

总的来说一句话，两个消息NC create destroy对应的应该有连个函数，但是原本的OnNcCreate响应隐藏在了__WndProc中，还有一个函数OnFinalMessage。this指针藏在SetWindowLongPtr(hWnd, GWLP_USERDATA，，，

好了底层需要注意的就只有这两个函数，其他的消息都应该是抛给子类去处理了。

既然是玩directUi，就重点关注一下WM_NCPAINT消息，也一个也很重要的消息WM_NCHITTEST。

不知道为什么这里用的都是NC系列消息。

NC应该是理解成none client，初步观察Duilib的size拖拉支持是使用NCHITTEST+SIZE消息来实现的。

看NCPAINT消息体里边没有任何代码这很诡异，所以还是看看完整的消息响应函数，是不是漏掉了什么：

    LRESULT HandleMessage(UINT uMsg, WPARAM wParam, LPARAM lParam)
    {
        LRESULT lRes = 0;
        BOOL bHandled = TRUE;
        switch( uMsg ) {
        case WM_CREATE:        lRes = OnCreate(uMsg, wParam, lParam, bHandled); break;
        case WM_CLOSE:         lRes = OnClose(uMsg, wParam, lParam, bHandled); break;
        case WM_DESTROY:       lRes = OnDestroy(uMsg, wParam, lParam, bHandled); break;
        case WM_NCACTIVATE:    lRes = OnNcActivate(uMsg, wParam, lParam, bHandled); break;
        case WM_NCCALCSIZE:    lRes = OnNcCalcSize(uMsg, wParam, lParam, bHandled); break;
        case WM_NCPAINT:       lRes = OnNcPaint(uMsg, wParam, lParam, bHandled); break;
        case WM_NCHITTEST:     lRes = OnNcHitTest(uMsg, wParam, lParam, bHandled); break;
        case WM_SIZE:          lRes = OnSize(uMsg, wParam, lParam, bHandled); break;
        case WM_GETMINMAXINFO: lRes = OnGetMinMaxInfo(uMsg, wParam, lParam, bHandled); break;
        case WM_SYSCOMMAND:    lRes = OnSysCommand(uMsg, wParam, lParam, bHandled); break;
        default:
            bHandled = FALSE;
        }
        if( bHandled ) return lRes;
        if( m_pm.MessageHandler(uMsg, wParam, lParam, lRes) ) return lRes;
        return CWindowWnd::HandleMessage(uMsg, wParam, lParam);
    }

乍看之下这里的消息处理至少分为三层，CWindowWnd派生类本身没有处理的消息将会被送到m_pm中去处理，如果m_pm.MessageHandler返回false消息最后还是CWindowWnd处理。

bool CPaintManagerUI::MessageHandler(UINT uMsg, WPARAM wParam, LPARAM lParam, LRESULT& lRes)
{
//#ifdef _DEBUG
//    switch( uMsg ) {
//    case WM_NCPAINT:
//    case WM_NCHITTEST:
//    case WM_SETCURSOR:
//       break;
//    default:
//       DUITRACE(_T("MSG: %-20s (%08ld)"), DUITRACEMSG(uMsg), ::GetTickCount());
//    }
//#endif
    // Not ready yet?
    if( m_hWndPaint == NULL ) return false;
    
    TNotifyUI* pMsg = NULL;
    while( pMsg = static_cast<TNotifyUI*>(m_aAsyncNotify.GetAt(0)) ) {
        m_aAsyncNotify.Remove(0);
        if( pMsg->pSender != NULL ) {
            if( pMsg->pSender->OnNotify ) pMsg->pSender->OnNotify(pMsg);
        }
        for( int j = 0; j < m_aNotifiers.GetSize(); j++ ) {
            static_cast<INotifyUI*>(m_aNotifiers[j])->Notify(*pMsg);
        }
        delete pMsg;
    }
    
    // Cycle through listeners
    for( int i = 0; i < m_aMessageFilters.GetSize(); i++ ) 
    {
        bool bHandled = false;
        LRESULT lResult = static_cast<IMessageFilterUI*>(m_aMessageFilters[i])->MessageHandler(uMsg, wParam, lParam, bHandled);
        if( bHandled ) {
            lRes = lResult;
            return true;
        }
    }
    // Custom handling of events
    switch( uMsg ) {
    case WM_APP + 1:
        {
            for( int i = 0; i < m_aDelayedCleanup.GetSize(); i++ ) 
                delete static_cast<CControlUI*>(m_aDelayedCleanup[i]);
            m_aDelayedCleanup.Empty();
        }
        break;
    case WM_CLOSE:
        {
            // Make sure all matching "closing" events are sent
            TEventUI event = { 0 };
            event.ptMouse = m_ptLastMousePos;
            event.dwTimestamp = ::GetTickCount();
            if( m_pEventHover != NULL ) {
                event.Type = UIEVENT_MOUSELEAVE;
                event.pSender = m_pEventHover;
                m_pEventHover->Event(event);
            }
            if( m_pEventClick != NULL ) {
                event.Type = UIEVENT_BUTTONUP;
                event.pSender = m_pEventClick;
                m_pEventClick->Event(event);
            }

            SetFocus(NULL);

            // Hmmph, the usual Windows tricks to avoid
            // focus loss...
            HWND hwndParent = GetWindowOwner(m_hWndPaint);
            if( hwndParent != NULL ) ::SetFocus(hwndParent);
        }
        break;
    case WM_ERASEBKGND:
        {
            // We'll do the painting here...
            lRes = 1;
        }
        return true;
    case WM_PAINT:
        {
            // Should we paint?
            RECT rcPaint = { 0 };
            if( !::GetUpdateRect(m_hWndPaint, &rcPaint, FALSE) ) return true;
            if( m_pRoot == NULL ) {
                PAINTSTRUCT ps = { 0 };
                ::BeginPaint(m_hWndPaint, &ps);
                ::EndPaint(m_hWndPaint, &ps);
                return true;
            }            
            // Do we need to resize anything?
            // This is the time where we layout the controls on the form.
            // We delay this even from the WM_SIZE messages since resizing can be
            // a very expensize operation.
            if( m_bUpdateNeeded ) {
                m_bUpdateNeeded = false;
                RECT rcClient = { 0 };
                ::GetClientRect(m_hWndPaint, &rcClient);
                if( !::IsRectEmpty(&rcClient) ) {
                    if( m_pRoot->IsUpdateNeeded() ) {
                        m_pRoot->SetPos(rcClient);
                        if( m_hDcOffscreen != NULL ) ::DeleteDC(m_hDcOffscreen);
                        if( m_hDcBackground != NULL ) ::DeleteDC(m_hDcBackground);
                        if( m_hbmpOffscreen != NULL ) ::DeleteObject(m_hbmpOffscreen);
                        if( m_hbmpBackground != NULL ) ::DeleteObject(m_hbmpBackground);
                        m_hDcOffscreen = NULL;
                        m_hDcBackground = NULL;
                        m_hbmpOffscreen = NULL;
                        m_hbmpBackground = NULL;
                    }
                    else {
                        CControlUI* pControl = NULL;
                        while( pControl = m_pRoot->FindControl(__FindControlFromUpdate, NULL, UIFIND_VISIBLE | UIFIND_ME_FIRST) ) {
                            pControl->SetPos( pControl->GetPos() );
                        }
                    }
                    // We'll want to notify the window when it is first initialized
                    // with the correct layout. The window form would take the time
                    // to submit swipes/animations.
                    if( m_bFirstLayout ) {
                        m_bFirstLayout = false;
                        SendNotify(m_pRoot, DUI_MSGTYPE_WINDOWINIT,  0, 0, false);
                    }
                }
            }
            // Set focus to first control?
            if( m_bFocusNeeded ) {
                SetNextTabControl();
            }
            //
            // Render screen
            //
            // Prepare offscreen bitmap?
            if( m_bOffscreenPaint && m_hbmpOffscreen == NULL )
            {
                RECT rcClient = { 0 };
                ::GetClientRect(m_hWndPaint, &rcClient);
                m_hDcOffscreen = ::CreateCompatibleDC(m_hDcPaint);
                m_hbmpOffscreen = ::CreateCompatibleBitmap(m_hDcPaint, rcClient.right - rcClient.left, rcClient.bottom - rcClient.top); 
                ASSERT(m_hDcOffscreen);
                ASSERT(m_hbmpOffscreen);
            }
            // Begin Windows paint
            PAINTSTRUCT ps = { 0 };
            ::BeginPaint(m_hWndPaint, &ps);
            if( m_bOffscreenPaint )
            {
                HBITMAP hOldBitmap = (HBITMAP) ::SelectObject(m_hDcOffscreen, m_hbmpOffscreen);
                int iSaveDC = ::SaveDC(m_hDcOffscreen);
                if( m_bAlphaBackground ) {
                    if( m_hbmpBackground == NULL ) {
                        RECT rcClient = { 0 };
                        ::GetClientRect(m_hWndPaint, &rcClient);
                        m_hDcBackground = ::CreateCompatibleDC(m_hDcPaint);;
                        m_hbmpBackground = ::CreateCompatibleBitmap(m_hDcPaint, rcClient.right - rcClient.left, rcClient.bottom - rcClient.top); 
                        ASSERT(m_hDcBackground);
                        ASSERT(m_hbmpBackground);
                        ::SelectObject(m_hDcBackground, m_hbmpBackground);
                        ::BitBlt(m_hDcBackground, ps.rcPaint.left, ps.rcPaint.top, ps.rcPaint.right - ps.rcPaint.left,
                            ps.rcPaint.bottom - ps.rcPaint.top, ps.hdc, ps.rcPaint.left, ps.rcPaint.top, SRCCOPY);
                    }
                    else
                        ::SelectObject(m_hDcBackground, m_hbmpBackground);
                    ::BitBlt(m_hDcOffscreen, ps.rcPaint.left, ps.rcPaint.top, ps.rcPaint.right - ps.rcPaint.left,
                        ps.rcPaint.bottom - ps.rcPaint.top, m_hDcBackground, ps.rcPaint.left, ps.rcPaint.top, SRCCOPY);
                }
                m_pRoot->DoPaint(m_hDcOffscreen, ps.rcPaint);
                for( int i = 0; i < m_aPostPaintControls.GetSize(); i++ ) {
                    CControlUI* pPostPaintControl = static_cast<CControlUI*>(m_aPostPaintControls[i]);
                    pPostPaintControl->DoPostPaint(m_hDcOffscreen, ps.rcPaint);
                }
                ::RestoreDC(m_hDcOffscreen, iSaveDC);
                ::BitBlt(ps.hdc, ps.rcPaint.left, ps.rcPaint.top, ps.rcPaint.right - ps.rcPaint.left,
                    ps.rcPaint.bottom - ps.rcPaint.top, m_hDcOffscreen, ps.rcPaint.left, ps.rcPaint.top, SRCCOPY);
                ::SelectObject(m_hDcOffscreen, hOldBitmap);

                if( m_bShowUpdateRect ) {
                    HPEN hOldPen = (HPEN)::SelectObject(ps.hdc, m_hUpdateRectPen);
                    ::SelectObject(ps.hdc, ::GetStockObject(HOLLOW_BRUSH));
                    ::Rectangle(ps.hdc, rcPaint.left, rcPaint.top, rcPaint.right, rcPaint.bottom);
                    ::SelectObject(ps.hdc, hOldPen);
                }
            }
            else
            {
                // A standard paint job
                int iSaveDC = ::SaveDC(ps.hdc);
                m_pRoot->DoPaint(ps.hdc, ps.rcPaint);
                ::RestoreDC(ps.hdc, iSaveDC);
            }
            // All Done!
            ::EndPaint(m_hWndPaint, &ps);
        }
        // If any of the painting requested a resize again, we'll need
        // to invalidate the entire window once more.
        if( m_bUpdateNeeded ) {
            ::InvalidateRect(m_hWndPaint, NULL, FALSE);
        }
        return true;
    case WM_PRINTCLIENT:
        {
            RECT rcClient;
            ::GetClientRect(m_hWndPaint, &rcClient);
            HDC hDC = (HDC) wParam;
            int save = ::SaveDC(hDC);
            m_pRoot->DoPaint(hDC, rcClient);
            // Check for traversing children. The crux is that WM_PRINT will assume
            // that the DC is positioned at frame coordinates and will paint the child
            // control at the wrong position. We'll simulate the entire thing instead.
            if( (lParam & PRF_CHILDREN) != 0 ) {
                HWND hWndChild = ::GetWindow(m_hWndPaint, GW_CHILD);
                while( hWndChild != NULL ) {
                    RECT rcPos = { 0 };
                    ::GetWindowRect(hWndChild, &rcPos);
                    ::MapWindowPoints(HWND_DESKTOP, m_hWndPaint, reinterpret_cast<LPPOINT>(&rcPos), 2);
                    ::SetWindowOrgEx(hDC, -rcPos.left, -rcPos.top, NULL);
                    // NOTE: We use WM_PRINT here rather than the expected WM_PRINTCLIENT
                    //       since the latter will not print the nonclient correctly for
                    //       EDIT controls.
                    ::SendMessage(hWndChild, WM_PRINT, wParam, lParam | PRF_NONCLIENT);
                    hWndChild = ::GetWindow(hWndChild, GW_HWNDNEXT);
                }
            }
            ::RestoreDC(hDC, save);
        }
        break;
    case WM_GETMINMAXINFO:
        {
            LPMINMAXINFO lpMMI = (LPMINMAXINFO) lParam;
            if( m_szMinWindow.cx > 0 ) lpMMI->ptMinTrackSize.x = m_szMinWindow.cx;
            if( m_szMinWindow.cy > 0 ) lpMMI->ptMinTrackSize.y = m_szMinWindow.cy;
            if( m_szMaxWindow.cx > 0 ) lpMMI->ptMaxTrackSize.x = m_szMaxWindow.cx;
            if( m_szMaxWindow.cy > 0 ) lpMMI->ptMaxTrackSize.y = m_szMaxWindow.cy;
        }
        break;
    case WM_SIZE:
        {
            if( m_pFocus != NULL ) {
                TEventUI event = { 0 };
                event.Type = UIEVENT_WINDOWSIZE;
                event.pSender = m_pFocus;
                event.dwTimestamp = ::GetTickCount();
                m_pFocus->Event(event);
            }
            if( m_pRoot != NULL ) m_pRoot->NeedUpdate();
        }
        return true;
    case WM_TIMER:
        {
            for( int i = 0; i < m_aTimers.GetSize(); i++ ) {
                const TIMERINFO* pTimer = static_cast<TIMERINFO*>(m_aTimers[i]);
                if( pTimer->hWnd == m_hWndPaint && pTimer->uWinTimer == LOWORD(wParam) && pTimer->bKilled == false) {
                    TEventUI event = { 0 };
                    event.Type = UIEVENT_TIMER;
                    event.pSender = pTimer->pSender;
                    event.wParam = pTimer->nLocalID;
                    event.dwTimestamp = ::GetTickCount();
                    pTimer->pSender->Event(event);
                    break;
                }
            }
        }
        break;
    case WM_MOUSEHOVER:
        {
            m_bMouseTracking = false;
            POINT pt = { GET_X_LPARAM(lParam), GET_Y_LPARAM(lParam) };
            CControlUI* pHover = FindControl(pt);
            if( pHover == NULL ) break;
            // Generate mouse hover event
            if( m_pEventHover != NULL ) {
                TEventUI event = { 0 };
                event.ptMouse = pt;
                event.Type = UIEVENT_MOUSEHOVER;
                event.pSender = m_pEventHover;
                event.dwTimestamp = ::GetTickCount();
                m_pEventHover->Event(event);
            }
            // Create tooltip information
            CDuiString sToolTip = pHover->GetToolTip();
            if( sToolTip.IsEmpty() ) return true;
            ::ZeroMemory(&m_ToolTip, sizeof(TOOLINFO));
            m_ToolTip.cbSize = sizeof(TOOLINFO);
            m_ToolTip.uFlags = TTF_IDISHWND;
            m_ToolTip.hwnd = m_hWndPaint;
            m_ToolTip.uId = (UINT_PTR) m_hWndPaint;
            m_ToolTip.hinst = m_hInstance;
            m_ToolTip.lpszText = const_cast<LPTSTR>( (LPCTSTR) sToolTip );
            m_ToolTip.rect = pHover->GetPos();
            if( m_hwndTooltip == NULL ) {
                m_hwndTooltip = ::CreateWindowEx(0, TOOLTIPS_CLASS, NULL, WS_POPUP | TTS_NOPREFIX | TTS_ALWAYSTIP, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, m_hWndPaint, NULL, m_hInstance, NULL);
                ::SendMessage(m_hwndTooltip, TTM_ADDTOOL, 0, (LPARAM) &m_ToolTip);
            }
            ::SendMessage(m_hwndTooltip, TTM_SETTOOLINFO, 0, (LPARAM) &m_ToolTip);
            ::SendMessage(m_hwndTooltip, TTM_TRACKACTIVATE, TRUE, (LPARAM) &m_ToolTip);
        }
        return true;
    case WM_MOUSELEAVE:
        {
            if( m_hwndTooltip != NULL ) ::SendMessage(m_hwndTooltip, TTM_TRACKACTIVATE, FALSE, (LPARAM) &m_ToolTip);
            if( m_bMouseTracking ) ::SendMessage(m_hWndPaint, WM_MOUSEMOVE, 0, (LPARAM) -1);
            m_bMouseTracking = false;
        }
        break;
    case WM_MOUSEMOVE:
        {
            // Start tracking this entire window again...
            if( !m_bMouseTracking ) {
                TRACKMOUSEEVENT tme = { 0 };
                tme.cbSize = sizeof(TRACKMOUSEEVENT);
                tme.dwFlags = TME_HOVER | TME_LEAVE;
                tme.hwndTrack = m_hWndPaint;
                tme.dwHoverTime = m_hwndTooltip == NULL ? 400UL : (DWORD) ::SendMessage(m_hwndTooltip, TTM_GETDELAYTIME, TTDT_INITIAL, 0L);
                _TrackMouseEvent(&tme);
                m_bMouseTracking = true;
            }
            // Generate the appropriate mouse messages
            POINT pt = { GET_X_LPARAM(lParam), GET_Y_LPARAM(lParam) };
            m_ptLastMousePos = pt;
            CControlUI* pNewHover = FindControl(pt);
            if( pNewHover != NULL && pNewHover->GetManager() != this ) break;
            TEventUI event = { 0 };
            event.ptMouse = pt;
            event.dwTimestamp = ::GetTickCount();
            if( pNewHover != m_pEventHover && m_pEventHover != NULL ) {
                event.Type = UIEVENT_MOUSELEAVE;
                event.pSender = m_pEventHover;
                m_pEventHover->Event(event);
                m_pEventHover = NULL;
                if( m_hwndTooltip != NULL ) ::SendMessage(m_hwndTooltip, TTM_TRACKACTIVATE, FALSE, (LPARAM) &m_ToolTip);
            }
            if( pNewHover != m_pEventHover && pNewHover != NULL ) {
                event.Type = UIEVENT_MOUSEENTER;
                event.pSender = pNewHover;
                pNewHover->Event(event);
                m_pEventHover = pNewHover;
            }
            if( m_pEventClick != NULL ) {
                event.Type = UIEVENT_MOUSEMOVE;
                event.pSender = m_pEventClick;
                m_pEventClick->Event(event);
            }
            else if( pNewHover != NULL ) {
                event.Type = UIEVENT_MOUSEMOVE;
                event.pSender = pNewHover;
                pNewHover->Event(event);
            }
        }
        break;
    case WM_LBUTTONDOWN:
        {
            // We alway set focus back to our app (this helps
            // when Win32 child windows are placed on the dialog
            // and we need to remove them on focus change).
            ::SetFocus(m_hWndPaint);
            POINT pt = { GET_X_LPARAM(lParam), GET_Y_LPARAM(lParam) };
            m_ptLastMousePos = pt;
            CControlUI* pControl = FindControl(pt);
            if( pControl == NULL ) break;
            if( pControl->GetManager() != this ) break;
            m_pEventClick = pControl;
            pControl->SetFocus();
            SetCapture();
            TEventUI event = { 0 };
            event.Type = UIEVENT_BUTTONDOWN;
            event.pSender = pControl;
            event.wParam = wParam;
            event.lParam = lParam;
            event.ptMouse = pt;
            event.wKeyState = (WORD)wParam;
            event.dwTimestamp = ::GetTickCount();
            pControl->Event(event);
        }
        break;
    case WM_LBUTTONDBLCLK:
        {
            ::SetFocus(m_hWndPaint);
            POINT pt = { GET_X_LPARAM(lParam), GET_Y_LPARAM(lParam) };
            m_ptLastMousePos = pt;
            CControlUI* pControl = FindControl(pt);
            if( pControl == NULL ) break;
            if( pControl->GetManager() != this ) break;
            SetCapture();
            TEventUI event = { 0 };
            event.Type = UIEVENT_DBLCLICK;
            event.pSender = pControl;
            event.ptMouse = pt;
            event.wKeyState = (WORD)wParam;
            event.dwTimestamp = ::GetTickCount();
            pControl->Event(event);
            m_pEventClick = pControl;
        }
        break;
    case WM_LBUTTONUP:
        {
            POINT pt = { GET_X_LPARAM(lParam), GET_Y_LPARAM(lParam) };
            m_ptLastMousePos = pt;
            if( m_pEventClick == NULL ) break;
            ReleaseCapture();
            TEventUI event = { 0 };
            event.Type = UIEVENT_BUTTONUP;
            event.pSender = m_pEventClick;
            event.wParam = wParam;
            event.lParam = lParam;
            event.ptMouse = pt;
            event.wKeyState = (WORD)wParam;
            event.dwTimestamp = ::GetTickCount();
            m_pEventClick->Event(event);
            m_pEventClick = NULL;
        }
        break;
    case WM_RBUTTONDOWN:
        {
            ::SetFocus(m_hWndPaint);
            POINT pt = { GET_X_LPARAM(lParam), GET_Y_LPARAM(lParam) };
            m_ptLastMousePos = pt;
            CControlUI* pControl = FindControl(pt);
            if( pControl == NULL ) break;
            if( pControl->GetManager() != this ) break;
            pControl->SetFocus();
            SetCapture();
            TEventUI event = { 0 };
            event.Type = UIEVENT_RBUTTONDOWN;
            event.pSender = pControl;
            event.wParam = wParam;
            event.lParam = lParam;
            event.ptMouse = pt;
            event.wKeyState = (WORD)wParam;
            event.dwTimestamp = ::GetTickCount();
            pControl->Event(event);
            m_pEventClick = pControl;
        }
        break;
    case WM_CONTEXTMENU:
        {
            POINT pt = { GET_X_LPARAM(lParam), GET_Y_LPARAM(lParam) };
            ::ScreenToClient(m_hWndPaint, &pt);
            m_ptLastMousePos = pt;
            if( m_pEventClick == NULL ) break;
            ReleaseCapture();
            TEventUI event = { 0 };
            event.Type = UIEVENT_CONTEXTMENU;
            event.pSender = m_pEventClick;
            event.ptMouse = pt;
            event.wKeyState = (WORD)wParam;
            event.lParam = (LPARAM)m_pEventClick;
            event.dwTimestamp = ::GetTickCount();
            m_pEventClick->Event(event);
            m_pEventClick = NULL;
        }
        break;
    case WM_MOUSEWHEEL:
        {
            POINT pt = { GET_X_LPARAM(lParam), GET_Y_LPARAM(lParam) };
            ::ScreenToClient(m_hWndPaint, &pt);
            m_ptLastMousePos = pt;
            CControlUI* pControl = FindControl(pt);
            if( pControl == NULL ) break;
            if( pControl->GetManager() != this ) break;
            int zDelta = (int) (short) HIWORD(wParam);
            TEventUI event = { 0 };
            event.Type = UIEVENT_SCROLLWHEEL;
            event.pSender = pControl;
            event.wParam = MAKELPARAM(zDelta < 0 ? SB_LINEDOWN : SB_LINEUP, 0);
            event.lParam = lParam;
            event.wKeyState = MapKeyState();
            event.dwTimestamp = ::GetTickCount();
            pControl->Event(event);

            // Let's make sure that the scroll item below the cursor is the same as before...
            ::SendMessage(m_hWndPaint, WM_MOUSEMOVE, 0, (LPARAM) MAKELPARAM(m_ptLastMousePos.x, m_ptLastMousePos.y));
        }
        break;
    case WM_CHAR:
        {
            if( m_pFocus == NULL ) break;
            TEventUI event = { 0 };
            event.Type = UIEVENT_CHAR;
            event.chKey = (TCHAR)wParam;
            event.ptMouse = m_ptLastMousePos;
            event.wKeyState = MapKeyState();
            event.dwTimestamp = ::GetTickCount();
            m_pFocus->Event(event);
        }
        break;
    case WM_KEYDOWN:
        {
            if( m_pFocus == NULL ) break;
            TEventUI event = { 0 };
            event.Type = UIEVENT_KEYDOWN;
            event.chKey = (TCHAR)wParam;
            event.ptMouse = m_ptLastMousePos;
            event.wKeyState = MapKeyState();
            event.dwTimestamp = ::GetTickCount();
            m_pFocus->Event(event);
            m_pEventKey = m_pFocus;
        }
        break;
    case WM_KEYUP:
        {
            if( m_pEventKey == NULL ) break;
            TEventUI event = { 0 };
            event.Type = UIEVENT_KEYUP;
            event.chKey = (TCHAR)wParam;
            event.ptMouse = m_ptLastMousePos;
            event.wKeyState = MapKeyState();
            event.dwTimestamp = ::GetTickCount();
            m_pEventKey->Event(event);
            m_pEventKey = NULL;
        }
        break;
    case WM_SETCURSOR:
        {
            if( LOWORD(lParam) != HTCLIENT ) break;
            if( m_bMouseCapture ) return true;

            POINT pt = { 0 };
            ::GetCursorPos(&pt);
            ::ScreenToClient(m_hWndPaint, &pt);
            CControlUI* pControl = FindControl(pt);
            if( pControl == NULL ) break;
            if( (pControl->GetControlFlags() & UIFLAG_SETCURSOR) == 0 ) break;
            TEventUI event = { 0 };
            event.Type = UIEVENT_SETCURSOR;
            event.wParam = wParam;
            event.lParam = lParam;
            event.ptMouse = pt;
            event.wKeyState = MapKeyState();
            event.dwTimestamp = ::GetTickCount();
            pControl->Event(event);
        }
        return true;
    case WM_NOTIFY:
        {
            LPNMHDR lpNMHDR = (LPNMHDR) lParam;
            if( lpNMHDR != NULL ) lRes = ::SendMessage(lpNMHDR->hwndFrom, OCM__BASE + uMsg, wParam, lParam);
            return true;
        }
        break;
    case WM_COMMAND:
        {
            if( lParam == 0 ) break;
            HWND hWndChild = (HWND) lParam;
            lRes = ::SendMessage(hWndChild, OCM__BASE + uMsg, wParam, lParam);
            return true;
        }
        break;
    case WM_CTLCOLOREDIT:
    case WM_CTLCOLORSTATIC:
        {
            // Refer To: http://msdn.microsoft.com/en-us/library/bb761691(v=vs.85).aspx
            // Read-only or disabled edit controls do not send the WM_CTLCOLOREDIT message; instead, they send the WM_CTLCOLORSTATIC message.
            if( lParam == 0 ) break;
            HWND hWndChild = (HWND) lParam;
            lRes = ::SendMessage(hWndChild, OCM__BASE + uMsg, wParam, lParam);
            return true;
        }
        break;
    default:
        break;
    }

    pMsg = NULL;
    while( pMsg = static_cast<TNotifyUI*>(m_aAsyncNotify.GetAt(0)) ) {
        m_aAsyncNotify.Remove(0);
        if( pMsg->pSender != NULL ) {
            if( pMsg->pSender->OnNotify ) pMsg->pSender->OnNotify(pMsg);
        }
        for( int j = 0; j < m_aNotifiers.GetSize(); j++ ) {
            static_cast<INotifyUI*>(m_aNotifiers[j])->Notify(*pMsg);
        }
        delete pMsg;
    }

    return false;
}

我去这里代码有点多，先简单捋一下，首先处理了如下消息：

WM_CTLCOLOREDIT:
WM_CTLCOLORSTATIC
WM_COMMAND:
WM_NOTIFY:
WM_SETCURSOR:
WM_KEYUP
WM_KEYDOWN
WM_CHAR
WM_MOUSEWHEEL
WM_CONTEXTMENU
WM_RBUTTONDOWN
WM_LBUTTONUP
WM_LBUTTONDBLCLK
WM_LBUTTONDOWN
WM_MOUSEMOVE
WM_MOUSELEAVE
WM_MOUSEHOVER
WM_TIMER
WM_SIZE
WM_GETMINMAXINFO
WM_PRINTCLIENT
WM_PAINT
WM_ERASEBKGND
WM_CLOSE
WM_APP

除了这些消息还有一个特别的东西需要留意：

m_aAsyncNotify以后再分析

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