C++ CTreeNode::GetCascadedposition方法代码示例

// This function is a callback from LineServices (the pfnFmt callback)
// Line services calls this to get the formattnig information for
// a non-text object in the layout, i.e. an image or a table or a div.
// We create a dobj and give it back to LS here.
// This is like a dobj constructor.
LSERR WINAPI CEmbeddedILSObj::Fmt(/*[in]*/PCFMTIN pfmtin, /*[out]*/FMTRES* pfmtres)
{
    LSTRACE(Fmt);

    BOOL                fOwnLine;
    INT                 xMinWidth;
    LONG                cchSite;
    LONG                xWidth, yHeight;
    OBJDIM              objdim;
    stylePosition       bPositionType;
    LSERR               lserr           = lserrNone;
    CLineServices*      pLS             = _pLS;
    CFlowLayout*        pFlowLayout     = pLS->_pFlowLayout;
    PLSRUN              plsrun          = PLSRUN(pfmtin->lsfrun.plsrun);
    CLayout*            pLayout         = plsrun->GetLayout(pFlowLayout);
    CElement*           pElementLayout;
    CTreeNode*          pNodeLayout;
    const CCharFormat*  pCF;
    const CFancyFormat* pFF;
    CEmbeddedDobj*      pdobj = new CEmbeddedDobj(this, pfmtin->plsdnTop);

    if(!pdobj)
    {
        lserr = lserrOutOfMemory;
        goto Cleanup;
    }

    // pLayout is the guy we're being asked to format here.
    Assert(pLayout && pLayout!=pFlowLayout);

    pElementLayout  = pLayout->ElementOwner();
    pNodeLayout     = pElementLayout->GetFirstBranch();
    pCF             = pNodeLayout->GetCharFormat();
    pFF             = pNodeLayout->GetFancyFormat();
    bPositionType   = pNodeLayout->GetCascadedposition();

    // for overlapping layouts curtail the range of characters measured
    cchSite = pLS->GetNestedElementCch(pElementLayout);

    ZeroMemory(&objdim, sizeof(OBJDIM));

    // Let's see if this an 'ownline' thingy.  Note that even if the element
    // is not by default and 'ownline' element, we may have morphed it into
    // one -- then too it has to be a block element. If it is not one (like
    // a span, then it will not live on its own line).  Check here.
    fOwnLine = pLS->IsOwnLineSite(plsrun);

    Assert(pElementLayout->IsInlinedElement());

    // Certain sites that only Microsoft supports can break with any
    // characters, so we hack that in right here.
    // BUGBUG (cthrash) This is goofy.  We should have a better way to
    // determine this than checking tag types.
    pdobj->_fIsBreakingSite= pElementLayout->Tag()==ETAG_OBJECT
        || pElementLayout->Tag()==ETAG_MARQUEE
        // This is really unfortunate -- if a site is percent sized then it becomes a breaking
        // site inside table cells. This is primarily for IE4x compat. See IE bug 42336 (SujalP)
        || pFF->_cuvWidth.GetUnitType()==CUnitValue::UNIT_PERCENT
        // One last thing - if we have a morphed non-ownline element inside
        // a table, it's considered a breaking site.
        || (!fOwnLine && !pElementLayout->_fSite);

    // If it's on its own line, and not first on line, FetchRun should have
    // terminated the line before we got here.
    // Assert( !( fOwnLine && !pfmtin->lsfgi.fFirstOnLine) );
    pFlowLayout->GetSiteWidth(pLayout, pLS->_pci,
        pLS->_lsMode==CLineServices::LSMODE_MEASURER,
        pLS->_xWrappingWidth,
        &xWidth, &yHeight, &xMinWidth);

    // v-Dimension computed in VerticalAlignObjects
    // BUGBUG (cthrash) We have rounding errors in LS; don't pass zero
    objdim.heightsRef.dvAscent = 1;
    objdim.heightsRef.dvDescent = 0;
    objdim.heightsRef.dvMultiLineHeight = 1;
    if(_pLS->_fMinMaxPass)
    {
        objdim.heightsPres = objdim.heightsRef;
    }

    if(pLS->_fIsRuby && !pLS->_fIsRubyText)
    {
        pLS->_yMaxHeightForRubyBase = max(pLS->_yMaxHeightForRubyBase, yHeight);
    }

    // We need to store two widths in the dobj: The width corresponding to
    // the wrapping width (urColumnMax) and the minimum width.  LsGetMinDur,
    // however, does not recognize two widths for ILS objects.  We therefore
    // cache the difference, and account for these in an enumeration callback
    // after the LsGetMinDur pass.
    if(!pLS->_fMinMaxPass)
    {
        pdobj->_dvMinMaxDelta = 0;
        objdim.dur = xWidth;
    }
//.........这里部分代码省略.........