sizecbar.cpp

功能： 在一个树控件窗口内添加一个“工程”或“文件夹”目录

    case AFX_IDW_DOCKBAR_TOP:
        m_dwSCBStyle |= SCBS_EDGEBOTTOM;
        break;
    case AFX_IDW_DOCKBAR_BOTTOM:
        m_dwSCBStyle |= SCBS_EDGETOP;
        break;
    case AFX_IDW_DOCKBAR_LEFT:
        m_dwSCBStyle |= SCBS_EDGERIGHT;
        break;
    case AFX_IDW_DOCKBAR_RIGHT:
        m_dwSCBStyle |= SCBS_EDGELEFT;
        break;
    }

    // make room for edges only if they will be painted
    if (m_dwSCBStyle & SCBS_SHOWEDGES)
        rc.DeflateRect(
            (m_dwSCBStyle & SCBS_EDGELEFT) ? m_cxEdge : 0,
            (m_dwSCBStyle & SCBS_EDGETOP) ? m_cxEdge : 0,
            (m_dwSCBStyle & SCBS_EDGERIGHT) ? m_cxEdge : 0,
            (m_dwSCBStyle & SCBS_EDGEBOTTOM) ? m_cxEdge : 0);

    *pRc = rc;
}

void CSizingControlBar::OnNcPaint()
{
    // get window DC that is clipped to the non-client area
    CWindowDC dc(this);

    CRect rcClient, rcBar;
    GetClientRect(rcClient);
    ClientToScreen(rcClient);
    GetWindowRect(rcBar);
    rcClient.OffsetRect(-rcBar.TopLeft());
    rcBar.OffsetRect(-rcBar.TopLeft());

    CDC mdc;
    mdc.CreateCompatibleDC(&dc);
    
    CBitmap bm;
    bm.CreateCompatibleBitmap(&dc, rcBar.Width(), rcBar.Height());
    CBitmap* pOldBm = mdc.SelectObject(&bm);

    // draw borders in non-client area
    CRect rcDraw = rcBar;
    DrawBorders(&mdc, rcDraw);

    // erase the NC background
    mdc.FillRect(rcDraw, CBrush::FromHandle(
        (HBRUSH) GetClassLong(m_hWnd, GCL_HBRBACKGROUND)));

    if (m_dwSCBStyle & SCBS_SHOWEDGES)
    {
        CRect rcEdge; // paint the sizing edges
        for (int i = 0; i < 4; i++)
            if (GetEdgeRect(rcBar, GetEdgeHTCode(i), rcEdge))
                mdc.Draw3dRect(rcEdge, ::GetSysColor(COLOR_BTNHIGHLIGHT),
                    ::GetSysColor(COLOR_BTNSHADOW));
    }

    NcPaintGripper(&mdc, rcClient);

    // client area is not our bussiness :)
    dc.IntersectClipRect(rcBar);
    dc.ExcludeClipRect(rcClient);

    dc.BitBlt(0, 0, rcBar.Width(), rcBar.Height(), &mdc, 0, 0, SRCCOPY);

    ReleaseDC(&dc);

    mdc.SelectObject(pOldBm);
    bm.DeleteObject();
    mdc.DeleteDC();
}

void CSizingControlBar::NcPaintGripper(CDC* pDC, CRect rcClient)
{
    UNUSED_ALWAYS(pDC);
    UNUSED_ALWAYS(rcClient);
}

void CSizingControlBar::OnPaint()
{
    // overridden to skip border painting based on clientrect
    CPaintDC dc(this);
}

UINT CSizingControlBar::OnNcHitTest(CPoint point)
{
    CRect rcBar, rcEdge;
    GetWindowRect(rcBar);

    if (!IsFloating())
        for (int i = 0; i < 4; i++)
            if (GetEdgeRect(rcBar, GetEdgeHTCode(i), rcEdge))
                if (rcEdge.PtInRect(point))
                    return GetEdgeHTCode(i);

    return HTCLIENT;
}

void CSizingControlBar::OnSettingChange(UINT uFlags, LPCTSTR lpszSection)
{
    baseCSizingControlBar::OnSettingChange(uFlags, lpszSection);

    m_bDragShowContent = FALSE;
    ::SystemParametersInfo(SPI_GETDRAGFULLWINDOWS, 0,
        &m_bDragShowContent, 0); // update
}

void CSizingControlBar::OnSize(UINT nType, int cx, int cy)
{
    UNUSED_ALWAYS(nType);
    
    if ((m_dwSCBStyle & SCBS_SIZECHILD) != 0)
    {
        // automatic child resizing - only one child is allowed
        CWnd* pWnd = GetWindow(GW_CHILD);
        if (pWnd != NULL)
        {
            pWnd->MoveWindow(0, 0, cx, cy);
			pWnd = pWnd->GetWindow(GW_HWNDNEXT);
           // ASSERT( pWnd == NULL);
        }
    }
}

void CSizingControlBar::OnClose()
{
    // do nothing: protection against accidentally destruction by the
    //   child control (i.e. if user hits Esc in a child editctrl)
}

/////////////////////////////////////////////////////////////////////////
// CSizingControlBar implementation helpers

void CSizingControlBar::StartTracking(UINT nHitTest, CPoint point)
{
    SetCapture();

    // make sure no updates are pending
    if (!m_bDragShowContent)
        RedrawWindow(NULL, NULL, RDW_ALLCHILDREN | RDW_UPDATENOW);

    m_htEdge = nHitTest;
    m_bTracking = TRUE;

    BOOL bHorz = IsHorzDocked();
    BOOL bHorzTracking = m_htEdge == HTLEFT || m_htEdge == HTRIGHT;

    m_nTrackPosOld = bHorzTracking ? point.x : point.y;

    CRect rcBar, rcEdge;
    GetWindowRect(rcBar);
    GetEdgeRect(rcBar, m_htEdge, rcEdge);
    m_nTrackEdgeOfs = m_nTrackPosOld -
        (bHorzTracking ? rcEdge.CenterPoint().x : rcEdge.CenterPoint().y);
    
    CSCBArray arrSCBars;
    int nThis;
    GetRowSizingBars(arrSCBars, nThis);

    m_nTrackPosMin = m_nTrackPosMax = m_nTrackPosOld;
    if (!IsSideTracking())
    {
        // calc minwidth as the max minwidth of the sizing bars on row
        int nMinWidth = bHorz ? m_szMinHorz.cy : m_szMinVert.cx;
        for (int i = 0; i < arrSCBars.GetSize(); i++)
            nMinWidth = max(nMinWidth, bHorz ? 
                arrSCBars[i]->m_szMinHorz.cy :
                arrSCBars[i]->m_szMinVert.cx);
        int nExcessWidth = (bHorz ? m_szHorz.cy : m_szVert.cx) - nMinWidth;

        // the control bar cannot grow with more than the width of
        // remaining client area of the mainframe
        CRect rcT;
        m_pDockSite->RepositionBars(0, 0xFFFF, AFX_IDW_PANE_FIRST,
            reposQuery, &rcT, NULL, TRUE);
        int nMaxWidth = bHorz ? rcT.Height() - 2 : rcT.Width() - 2;

        BOOL bTopOrLeft = m_htEdge == HTTOP || m_htEdge == HTLEFT;

        m_nTrackPosMin -= bTopOrLeft ? nMaxWidth : nExcessWidth;
        m_nTrackPosMax += bTopOrLeft ? nExcessWidth : nMaxWidth;
    }
    else
    {
        // side tracking:
        // max size is the actual size plus the amount the other
        // sizing bars can be decreased until they reach their minsize
        if (m_htEdge == HTBOTTOM || m_htEdge == HTRIGHT)
            nThis++;

        for (int i = 0; i < arrSCBars.GetSize(); i++)
        {
            CSizingControlBar* pBar = arrSCBars[i];

            int nExcessWidth = bHorz ? 
                pBar->m_szHorz.cx - pBar->m_szMinHorz.cx :
                pBar->m_szVert.cy - pBar->m_szMinVert.cy;

            if (i < nThis)
                m_nTrackPosMin -= nExcessWidth;
            else
                m_nTrackPosMax += nExcessWidth;
        }
    }

    OnTrackInvertTracker(); // draw tracker
}

void CSizingControlBar::StopTracking()
{
    OnTrackInvertTracker(); // erase tracker

    m_bTracking = FALSE;
    ReleaseCapture();

    m_pDockSite->DelayRecalcLayout();
}

void CSizingControlBar::OnTrackUpdateSize(CPoint& point)
{
    ASSERT(!IsFloating());

    BOOL bHorzTrack = m_htEdge == HTLEFT || m_htEdge == HTRIGHT;

    int nTrackPos = bHorzTrack ? point.x : point.y;
    nTrackPos = max(m_nTrackPosMin, min(m_nTrackPosMax, nTrackPos));

    int nDelta = nTrackPos - m_nTrackPosOld;

    if (nDelta == 0)
        return; // no pos change

    OnTrackInvertTracker(); // erase tracker

    m_nTrackPosOld = nTrackPos;
    
    BOOL bHorz = IsHorzDocked();

    CSize sizeNew = bHorz ? m_szHorz : m_szVert;
    switch (m_htEdge)
    {
    case HTLEFT:    sizeNew -= CSize(nDelta, 0); break;
    case HTTOP:     sizeNew -= CSize(0, nDelta); break;
    case HTRIGHT:   sizeNew += CSize(nDelta, 0); break;
    case HTBOTTOM:  sizeNew += CSize(0, nDelta); break;
    }

    CSCBArray arrSCBars;
    int nThis;
    GetRowSizingBars(arrSCBars, nThis);

    if (!IsSideTracking())
        for (int i = 0; i < arrSCBars.GetSize(); i++)
        {
            CSizingControlBar* pBar = arrSCBars[i];
            // make same width (or height)
            (bHorz ? pBar->m_szHorz.cy : pBar->m_szVert.cx) =
                bHorz ? sizeNew.cy : sizeNew.cx;
        }
    else
    {
        int nGrowingBar = nThis;
        BOOL bBefore = m_htEdge == HTTOP || m_htEdge == HTLEFT;
        if (bBefore && nDelta > 0)
            nGrowingBar--;
        if (!bBefore && nDelta < 0)
            nGrowingBar++;
        if (nGrowingBar != nThis)
            bBefore = !bBefore;

        // nGrowing is growing
        nDelta = abs(nDelta);
        CSizingControlBar* pBar = arrSCBars[nGrowingBar];
        (bHorz ? pBar->m_szHorz.cx : pBar->m_szVert.cy) += nDelta;

        // the others are shrinking
        int nFirst = bBefore ? nGrowingBar - 1 : nGrowingBar + 1;
        int nLimit = bBefore ? -1 : arrSCBars.GetSize();

        for (int i = nFirst; nDelta != 0 && i != nLimit; i += (bBefore ? -1 : 1))
        {
            CSizingControlBar* pBar = arrSCBars[i];
                
            int nDeltaT = min(nDelta,
                (bHorz ? pBar->m_szHorz.cx : pBar->m_szVert.cy) -
                (bHorz ? pBar->m_szMinHorz.cx : pBar->m_szMinVert.cy));

            (bHorz ? pBar->m_szHorz.cx : pBar->m_szVert.cy) -= nDeltaT;
            nDelta -= nDeltaT;
        }
    }

    OnTrackInvertTracker(); // redraw tracker at new pos

    if (m_bDragShowContent)
        m_pDockSite->DelayRecalcLayout();
}

void CSizingControlBar::OnTrackInvertTracker()
{
    ASSERT(m_bTracking);

    if (m_bDragShowContent)
        return; // don't show tracker if DragFullWindows is on

    BOOL bHorz = IsHorzDocked();
    CRect rc, rcBar, rcDock, rcFrame;
    GetWindowRect(rcBar);
    m_pDockBar->GetWindowRect(rcDock);
    m_pDockSite->GetWindowRect(rcFrame);
    VERIFY(GetEdgeRect(rcBar, m_htEdge, rc));
    if (!IsSideTracking())
        rc = bHorz ? 
            CRect(rcDock.left + 1, rc.top, rcDock.right - 1, rc.bottom) :
            CRect(rc.left, rcDock.top + 1, rc.right, rcDock.bottom - 1);

    BOOL bHorzTracking = m_htEdge == HTLEFT || m_htEdge == HTRIGHT;
    int nOfs = m_nTrackPosOld - m_nTrackEdgeOfs;
    nOfs -= bHorzTracking ? rc.CenterPoint().x : rc.CenterPoint().y;
    rc.OffsetRect(bHorzTracking ? nOfs : 0, bHorzTracking ? 0 : nOfs);
    rc.OffsetRect(-rcFrame.TopLeft());

    CDC *pDC = m_pDockSite->GetDCEx(NULL,
        DCX_WINDOW | DCX_CACHE | DCX_LOCKWINDOWUPDATE);
    CBrush* pBrush = CDC::GetHalftoneBrush();
    CBrush* pBrushOld = pDC->SelectObject(pBrush);

    pDC->PatBlt(rc.left, rc.top, rc.Width(), rc.Height(), PATINVERT);
    
    pDC->SelectObject(pBrushOld);
    m_pDockSite->ReleaseDC(pDC);
}

BOOL CSizingControlBar::GetEdgeRect(CRect rcWnd, UINT nHitTest,
                                    CRect& rcEdge)
{
    rcEdge = rcWnd;
    if (m_dwSCBStyle & SCBS_SHOWEDGES)
        rcEdge.DeflateRect(1, 1);
    BOOL bHorz = IsHorzDocked();

    switch (nHitTest)
    {
    case HTLEFT:
        if (!(m_dwSCBStyle & SCBS_EDGELEFT)) return FALSE;
        rcEdge.right = rcEdge.left + m_cxEdge;
        rcEdge.DeflateRect(0, bHorz ? m_cxEdge: 0);
        break;
    case HTTOP:
        if (!(m_dwSCBStyle & SCBS_EDGETOP)) return FALSE;
        rcEdge.bottom = rcEdge.top + m_cxEdge;
        rcEdge.DeflateRect(bHorz ? 0 : m_cxEdge, 0);
        break;
    case HTRIGHT:
        if (!(m_dwSCBStyle & SCBS_EDGERIGHT)) return FALSE;
        rcEdge.left = rcEdge.right - m_cxEdge;
        rcEdge.DeflateRect(0, bHorz ? m_cxEdge: 0);
        break;
    case HTBOTTOM:
        if (!(m_dwSCBStyle & SCBS_EDGEBOTTOM)) return FALSE;
        rcEdge.top = rcEdge.bottom - m_cxEdge;
        rcEdge.DeflateRect(bHorz ? 0 : m_cxEdge, 0);
        break;
    default:
        ASSERT(FALSE); // invalid hit test code
    }
    return TRUE;
}

UINT CSizingControlBar::GetEdgeHTCode(int nEdge)
{
    if (nEdge == 0) return HTLEFT;
    if (nEdge == 1) return HTTOP;
    if (nEdge == 2) return HTRIGHT;
    if (nEdge == 3) return HTBOTTOM;
    ASSERT(FALSE); // invalid edge code
    return HTNOWHERE;
}

void CSizingControlBar::GetRowInfo(int& nFirst, int& nLast, int& nThis)
{
    ASSERT_VALID(m_pDockBar); // verify bounds

    nThis = m_pDockBar->FindBar(this);
    ASSERT(nThis != -1);

    int i, nBars = m_pDockBar->m_arrBars.GetSize();

    // find the first and the last bar in row
    for (nFirst = -1, i = nThis - 1; i >= 0 && nFirst == -1; i--)
        if (m_pDockBar->m_arrBars[i] == NULL)
            nFirst = i + 1;
    for (nLast = -1, i = nThis + 1; i < nBars && nLast == -1; i++)
        if (m_pDockBar->m_arrBars[i] == NULL)
            nLast = i - 1;

    ASSERT((nLast != -1) && (nFirst != -1));
}

void CSizingControlBar::GetRowSizingBars(CSCBArray& arrSCBars)
{
    int nThis; // dummy
    GetRowSizingBars(arrSCBars, nThis);
}

void CSizingControlBar::GetRowSizingBars(CSCBArray& arrSCBars, int& nThis)
{
    arrSCBars.RemoveAll();

    int nFirstT, nLastT, nThisT;
    GetRowInfo(nFirstT, nLastT, nThisT);

    nThis = -1;
    for (int i = nFirstT; i <= nLastT; i++)
    {
        CSizingControlBar* pBar =
            (CSizingControlBar*) m_pDockBar->m_arrBars[i];
        if (HIWORD(pBar) == 0) continue; // placeholder
        if (!pBar->IsVisible()) continue;
        if (pBar->IsKindOf(RUNTIME_CLASS(CSizingControlBar)))
        {
            if (pBar == this)
                nThis = arrSCBars.GetSize();

            arrSCBars.Add(pBar);
        }
    }
}