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

Source/core/rendering/RenderMultiColumnBlock.h

Index: Source/core/rendering/RenderMultiColumnBlock.h
diff --git a/Source/core/rendering/RenderMultiColumnBlock.h b/Source/core/rendering/RenderMultiColumnBlock.h
deleted file mode 100644
index cdcf00b6f94125fa2942fbbfe8d7dcb97e0701e9..0000000000000000000000000000000000000000
--- a/Source/core/rendering/RenderMultiColumnBlock.h
+++ /dev/null
@@ -1,83 +0,0 @@
-/*
- * Copyright (C) 2012 Apple Inc.  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 APPLE INC. ``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 COMPUTER, INC. OR
- * CONTRIBUTORS 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.
- */
-
-
-#ifndef RenderMultiColumnBlock_h
-#define RenderMultiColumnBlock_h
-
-#include "core/rendering/RenderBlockFlow.h"
-
-namespace WebCore {
-
-class RenderMultiColumnFlowThread;
-
-class RenderMultiColumnBlock FINAL : public RenderBlockFlow {
-public:
-    RenderMultiColumnBlock(Element*);
-
-    LayoutUnit columnHeightAvailable() const { return m_columnHeightAvailable; }
-
-    LayoutUnit columnWidth() const { return m_columnWidth; }
-    unsigned columnCount() const { return m_columnCount; }
-
-    RenderMultiColumnFlowThread* flowThread() const { return m_flowThread; }
-
-    bool requiresBalancing() const { return !m_columnHeightAvailable || style()->columnFill() == ColumnFillBalance; }
-
-private:
-    virtual bool isRenderMultiColumnBlock() const OVERRIDE { return true; }
-
-    virtual const char* renderName() const OVERRIDE;
-
-    virtual RenderObject* layoutSpecialExcludedChild(bool relayoutChildren, SubtreeLayoutScope&) OVERRIDE;
-
-    virtual void styleDidChange(StyleDifference, const RenderStyle*) OVERRIDE;
-
-    virtual bool updateLogicalWidthAndColumnWidth() OVERRIDE;
-    virtual void checkForPaginationLogicalHeightChange(LayoutUnit& pageLogicalHeight, bool& pageLogicalHeightChanged, bool& hasSpecifiedPageLogicalHeight) OVERRIDE;
-    virtual bool relayoutForPagination(bool hasSpecifiedPageLogicalHeight, LayoutUnit pageLogicalHeight, LayoutStateMaintainer&) OVERRIDE;
-
-    virtual bool supportsPartialLayout() const OVERRIDE { return false; }
-
-    virtual void addChild(RenderObject* newChild, RenderObject* beforeChild = 0) OVERRIDE;
-
-    void computeColumnCountAndWidth();
-
-    void ensureColumnSets();
-
-    RenderMultiColumnFlowThread* m_flowThread;
-    unsigned m_columnCount;   // The default column count/width that are based off our containing block width. These values represent only the default,
-    LayoutUnit m_columnWidth; // since a multi-column block that is split across variable width pages or regions will have different column counts and widths in each.
-                              // These values will be cached (eventually) for multi-column blocks.
-    LayoutUnit m_columnHeightAvailable; // Total height available to columns, or 0 if auto.
-    bool m_inBalancingPass; // Set when relayouting for column balancing.
-};
-
-DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderMultiColumnBlock, isRenderMultiColumnBlock());
-
-} // namespace WebCore
-
-#endif // RenderMultiColumnBlock_h
-