rootinlinebox.cpp

linux下开源浏览器WebKit的源码,市面上的很多商用浏览器都是移植自WebKit

/*
 * Copyright (C) 2003, 2006, 2008 Apple Inc. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this library; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 */

#include "config.h"
#include "RootInlineBox.h"

#include "BidiResolver.h"
#include "ChromeClient.h"
#include "Document.h"
#include "EllipsisBox.h"
#include "Frame.h"
#include "GraphicsContext.h"
#include "HitTestResult.h"
#include "Page.h"
#include "RenderArena.h"
#include "RenderBlock.h"

using namespace std;

namespace WebCore {
    
typedef WTF::HashMap<const RootInlineBox*, EllipsisBox*> EllipsisBoxMap;
static EllipsisBoxMap* gEllipsisBoxMap = 0;

void* RootInlineBox::Overflow::operator new(size_t sz, RenderArena* renderArena) throw()
{
    return renderArena->allocate(sz);
}

void RootInlineBox::Overflow::operator delete(void* ptr, size_t sz)
{
    // Stash size where destroy can find it.
    *(size_t *)ptr = sz;
}

void RootInlineBox::Overflow::destroy(RenderArena* renderArena)
{
    delete this;
    // Recover the size left there for us by operator delete and free the memory.
    renderArena->free(*(size_t *)this, this);
}

void RootInlineBox::destroy(RenderArena* arena)
{
    if (m_overflow)
        m_overflow->destroy(arena);
    detachEllipsisBox(arena);
    InlineFlowBox::destroy(arena);
}

void RootInlineBox::detachEllipsisBox(RenderArena* arena)
{
    if (m_hasEllipsisBox) {
        EllipsisBox* box = gEllipsisBoxMap->take(this);
        box->setParent(0);
        box->destroy(arena);
        m_hasEllipsisBox = false;
    }
}

int RootInlineBox::height() const
{
    const Font& font = renderer()->style(m_firstLine)->font();
    int result = font.height();
    bool strictMode = renderer()->document()->inStrictMode();
    if (!strictMode && !hasTextChildren() && !boxModelObject()->hasHorizontalBordersOrPadding()) {
        int bottom = bottomOverflow();
        if (y() + result > bottom)
            result = bottom - y();
    }
    return result;
}

RenderLineBoxList* RootInlineBox::rendererLineBoxes() const
{
    return block()->lineBoxes();
}

void RootInlineBox::clearTruncation()
{
    if (m_hasEllipsisBox) {
        detachEllipsisBox(renderer()->renderArena());
        InlineFlowBox::clearTruncation();
    }
}

bool RootInlineBox::canAccommodateEllipsis(bool ltr, int blockEdge, int lineBoxEdge, int ellipsisWidth)
{
    // First sanity-check the unoverflowed width of the whole line to see if there is sufficient room.
    int delta = ltr ? lineBoxEdge - blockEdge : blockEdge - lineBoxEdge;
    if (width() - delta < ellipsisWidth)
        return false;

    // Next iterate over all the line boxes on the line.  If we find a replaced element that intersects
    // then we refuse to accommodate the ellipsis.  Otherwise we're ok.
    return InlineFlowBox::canAccommodateEllipsis(ltr, blockEdge, ellipsisWidth);
}

void RootInlineBox::placeEllipsis(const AtomicString& ellipsisStr,  bool ltr, int blockEdge, int ellipsisWidth,
                                  InlineBox* markupBox)
{
    // Create an ellipsis box.
    EllipsisBox* ellipsisBox = new (renderer()->renderArena()) EllipsisBox(renderer(), ellipsisStr, this,
                                                              ellipsisWidth - (markupBox ? markupBox->width() : 0), height(),
                                                              y(), !prevRootBox(),
                                                              markupBox);
    
    if (!gEllipsisBoxMap)
        gEllipsisBoxMap = new EllipsisBoxMap();
    gEllipsisBoxMap->add(this, ellipsisBox);
    m_hasEllipsisBox = true;

    if (ltr && (x() + width() + ellipsisWidth) <= blockEdge) {
        ellipsisBox->m_x = x() + width();
        return;
    }

    // Now attempt to find the nearest glyph horizontally and place just to the right (or left in RTL)
    // of that glyph.  Mark all of the objects that intersect the ellipsis box as not painting (as being
    // truncated).
    bool foundBox = false;
    ellipsisBox->m_x = placeEllipsisBox(ltr, blockEdge, ellipsisWidth, foundBox);
}

int RootInlineBox::placeEllipsisBox(bool ltr, int blockEdge, int ellipsisWidth, bool& foundBox)
{
    int result = InlineFlowBox::placeEllipsisBox(ltr, blockEdge, ellipsisWidth, foundBox);
    if (result == -1)
        result = ltr ? blockEdge - ellipsisWidth : blockEdge;
    return result;
}

void RootInlineBox::paintEllipsisBox(RenderObject::PaintInfo& paintInfo, int tx, int ty) const
{
    if (m_hasEllipsisBox && renderer()->shouldPaintWithinRoot(paintInfo) && renderer()->style()->visibility() == VISIBLE &&
            paintInfo.phase == PaintPhaseForeground)
        ellipsisBox()->paint(paintInfo, tx, ty);
}

#if PLATFORM(MAC)

void RootInlineBox::addHighlightOverflow()
{
    Frame* frame = renderer()->document()->frame();
    if (!frame)
        return;
    Page* page = frame->page();
    if (!page)
        return;

    // Highlight acts as a selection inflation.
    FloatRect rootRect(0, selectionTop(), width(), selectionHeight());
    IntRect inflatedRect = enclosingIntRect(page->chrome()->client()->customHighlightRect(renderer()->node(), renderer()->style()->highlight(), rootRect));
    setHorizontalOverflowPositions(min(leftOverflow(), inflatedRect.x()), max(rightOverflow(), inflatedRect.right()));
    setVerticalOverflowPositions(min(topOverflow(), inflatedRect.y()), max(bottomOverflow(), inflatedRect.bottom()));
}

void RootInlineBox::paintCustomHighlight(RenderObject::PaintInfo& paintInfo, int tx, int ty, const AtomicString& highlightType)
{
    if (!renderer()->shouldPaintWithinRoot(paintInfo) || renderer()->style()->visibility() != VISIBLE || paintInfo.phase != PaintPhaseForeground)
        return;

    Frame* frame = renderer()->document()->frame();
    if (!frame)
        return;
    Page* page = frame->page();
    if (!page)
        return;

    // Get the inflated rect so that we can properly hit test.
    FloatRect rootRect(tx + x(), ty + selectionTop(), width(), selectionHeight());
    FloatRect inflatedRect = page->chrome()->client()->customHighlightRect(renderer()->node(), highlightType, rootRect);
    if (inflatedRect.intersects(paintInfo.rect))
        page->chrome()->client()->paintCustomHighlight(renderer()->node(), highlightType, rootRect, rootRect, false, true);
}

#endif

void RootInlineBox::paint(RenderObject::PaintInfo& paintInfo, int tx, int ty)
{
    InlineFlowBox::paint(paintInfo, tx, ty);
    paintEllipsisBox(paintInfo, tx, ty);
#if PLATFORM(MAC)
    RenderStyle* styleToUse = renderer()->style(m_firstLine);
    if (styleToUse->highlight() != nullAtom && !paintInfo.context->paintingDisabled())
        paintCustomHighlight(paintInfo, tx, ty, styleToUse->highlight());
#endif
}

bool RootInlineBox::nodeAtPoint(const HitTestRequest& request, HitTestResult& result, int x, int y, int tx, int ty)
{
    if (m_hasEllipsisBox && visibleToHitTesting()) {
        if (ellipsisBox()->nodeAtPoint(request, result, x, y, tx, ty)) {
            renderer()->updateHitTestResult(result, IntPoint(x - tx, y - ty));
            return true;
        }
    }
    return InlineFlowBox::nodeAtPoint(request, result, x, y, tx, ty);
}

void RootInlineBox::adjustPosition(int dx, int dy)
{
    InlineFlowBox::adjustPosition(dx, dy);
    if (m_overflow) {
        m_overflow->m_topOverflow += dy;
        m_overflow->m_bottomOverflow += dy;
        m_overflow->m_selectionTop += dy;
        m_overflow->m_selectionBottom += dy;
    }