*** DO NOT LAND *** Attempt to understand Regions complexity

Source/core/rendering/RenderNamedFlowFragment.cpp

Index: Source/core/rendering/RenderNamedFlowFragment.cpp
diff --git a/Source/core/rendering/RenderNamedFlowFragment.cpp b/Source/core/rendering/RenderNamedFlowFragment.cpp
deleted file mode 100644
index 5a754e99f82a16103755a08cf0de7bd586c13ef9..0000000000000000000000000000000000000000
--- a/Source/core/rendering/RenderNamedFlowFragment.cpp
+++ /dev/null
@@ -1,108 +0,0 @@
-/*
- * Copyright (C) 2013 Adobe Systems Incorporated. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above
- *    copyright notice, this list of conditions and the following
- *    disclaimer.
- * 2. Redistributions in binary form must reproduce the above
- *    copyright notice, this list of conditions and the following
- *    disclaimer in the documentation and/or other materials
- *    provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER "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 THE COPYRIGHT HOLDER BE
- * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
- * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
- * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
- * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
-#include "config.h"
-#include "core/rendering/RenderNamedFlowFragment.h"
-
-#include "core/rendering/FlowThreadController.h"
-#include "core/rendering/RenderBoxRegionInfo.h"
-#include "core/rendering/RenderFlowThread.h"
-#include "core/rendering/RenderNamedFlowThread.h"
-#include "core/rendering/RenderView.h"
-
-using namespace std;
-
-namespace WebCore {
-
-RenderNamedFlowFragment::RenderNamedFlowFragment()
-    : RenderRegion(0, 0)
-{
-}
-
-RenderNamedFlowFragment::~RenderNamedFlowFragment()
-{
-}
-
-RenderNamedFlowFragment* RenderNamedFlowFragment::createAnonymous(Document* document)
-{
-    RenderNamedFlowFragment* region = new RenderNamedFlowFragment();
-    region->setDocumentForAnonymous(document);
-    return region;
-}
-
-void RenderNamedFlowFragment::setStyleForNamedFlowFragment(const RenderStyle* parentStyle)
-{
-    RefPtr<RenderStyle> newStyle = RenderStyle::createAnonymousStyleWithDisplay(parentStyle, BLOCK);
-
-    newStyle->setFlowThread(parentStyle->flowThread());
-    newStyle->setRegionThread(parentStyle->regionThread());
-    newStyle->setRegionFragment(parentStyle->regionFragment());
-    newStyle->setShapeInside(parentStyle->shapeInside());
-    newStyle->setOverflowX(parentStyle->overflowX());
-    newStyle->setOverflowY(parentStyle->overflowY());
-
-    setStyle(newStyle.release());
-}
-
-void RenderNamedFlowFragment::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle)
-{
-    RenderRegion::styleDidChange(diff, oldStyle);
-
-    if (parent() && parent()->needsLayout())
-        setNeedsLayout();
-}
-
-// FIXME: flex items as regions with flex-basis: 0 inside a flex container
-// with flex-direction: column should not be treated as auto-height regions
-bool RenderNamedFlowFragment::shouldHaveAutoLogicalHeight() const
-{
-    ASSERT(parent());
-
-    RenderStyle* styleToUse = parent()->style();
-    bool hasSpecifiedEndpointsForHeight = styleToUse->logicalTop().isSpecified() && styleToUse->logicalBottom().isSpecified();
-    bool hasAnchoredEndpointsForHeight = isOutOfFlowPositioned() && hasSpecifiedEndpointsForHeight;
-    bool hasAutoHeightStyle = styleToUse->logicalHeight().isAuto()
-        || styleToUse->logicalHeight().isFitContent()
-        || styleToUse->logicalHeight().isMaxContent()
-        || styleToUse->logicalHeight().isMinContent();
-    return hasAutoHeightStyle && !hasAnchoredEndpointsForHeight;
-}
-
-LayoutUnit RenderNamedFlowFragment::maxPageLogicalHeight() const
-{
-    ASSERT(m_flowThread);
-    ASSERT(hasAutoLogicalHeight() && !m_flowThread->inConstrainedLayoutPhase());
-    ASSERT(isAnonymous());
-    ASSERT(parent());
-
-    RenderStyle* styleToUse = parent()->style();
-    return styleToUse->logicalMaxHeight().isUndefined() ? RenderFlowThread::maxLogicalHeight() : toRenderBlock(parent())->computeReplacedLogicalHeightUsing(styleToUse->logicalMaxHeight());
-}
-
-}