Source/WebCore/layout/inlineformatting/InlineFormattingContext.cpp

/*
 * Copyright (C) 2018 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
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 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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#include "config.h"
#include "InlineFormattingContext.h"

#if ENABLE(LAYOUT_FORMATTING_CONTEXT)

#include "FloatingState.h"
#include "InlineFormattingState.h"
#include "LayoutBox.h"
#include "LayoutContext.h"
#include <wtf/IsoMallocInlines.h>

namespace WebCore {
namespace Layout {

WTF_MAKE_ISO_ALLOCATED_IMPL(InlineFormattingContext);

InlineFormattingContext::InlineFormattingContext(const Box& formattingContextRoot, LayoutContext& layoutContext)
    : FormattingContext(formattingContextRoot, layoutContext)
{
}

void InlineFormattingContext::layout(FormattingState&)
{
}

std::unique_ptr<FormattingState> InlineFormattingContext::createFormattingState(Ref<FloatingState>&& floatingState) const
{
    return std::make_unique<InlineFormattingState>(WTFMove(floatingState));
}

Ref<FloatingState> InlineFormattingContext::createOrFindFloatingState() const
{
    // If the block container box that initiates this inline formatting context also establishes a block context, the floats outside of the formatting root
    // should not interfere with the content inside.
    // <div style="float: left"></div><div style="overflow: hidden"> <- is a non-intrusive float, because overflow: hidden triggers new block formatting context.</div>
    if (root().establishesBlockFormattingContext())
        return FloatingState::create();
    // Otherwise, the formatting context inherits the floats from the parent formatting context.
    // Find the formatting state in which this formatting root lives, not the one it creates (this) and use its floating state.
    auto& formattingState = layoutContext().formattingStateForBox(root());
    return formattingState.floatingState();
}

}
}

#endif