RenderFragmentContainerSet.cpp   [plain text]


/*
 * Copyright (C) 2012 Apple Inc.  All rights reserved.
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 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
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#include "config.h"
#include "RenderFragmentContainerSet.h"

#include "RenderBoxFragmentInfo.h"
#include "RenderFragmentedFlow.h"
#include <wtf/IsoMallocInlines.h>

namespace WebCore {

WTF_MAKE_ISO_ALLOCATED_IMPL(RenderFragmentContainerSet);

RenderFragmentContainerSet::RenderFragmentContainerSet(Document& document, RenderStyle&& style, RenderFragmentedFlow& fragmentedFlow)
    : RenderFragmentContainer(document, WTFMove(style), &fragmentedFlow)
{
}

void RenderFragmentContainerSet::installFragmentedFlow()
{
    // We don't have to do anything, since we were able to connect the flow thread
    // in the constructor.
}

void RenderFragmentContainerSet::expandToEncompassFragmentedFlowContentsIfNeeded()
{
    // Whenever the last region is a set, it always expands its region rect to consume all
    // of the flow thread content. This is because it is always capable of generating an
    // infinite number of boxes in order to hold all of the remaining content.
    LayoutRect rect(fragmentedFlowPortionRect());
    
    // Get the offset within the flow thread in its block progression direction. Then get the
    // flow thread's remaining logical height including its overflow and expand our rect
    // to encompass that remaining height and overflow. The idea is that we will generate
    // additional columns and pages to hold that overflow, since people do write bad
    // content like <body style="height:0px"> in multi-column layouts.
    bool isHorizontal = fragmentedFlow()->isHorizontalWritingMode();
    LayoutUnit logicalTopOffset = isHorizontal ? rect.y() : rect.x();
    LayoutRect layoutRect = fragmentedFlow()->layoutOverflowRect();
    LayoutUnit logicalHeightWithOverflow = (isHorizontal ? layoutRect.maxY() : layoutRect.maxX()) - logicalTopOffset;
    setFragmentedFlowPortionRect(LayoutRect(rect.x(), rect.y(), isHorizontal ? rect.width() : logicalHeightWithOverflow, isHorizontal ? logicalHeightWithOverflow : rect.height()));
}

}