1/*
2 * Copyright (C) 2017 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
23 * THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#pragma once
27
28#include "RenderTreeBuilder.h"
29
30namespace WebCore {
31
32class RenderBlockFlow;
33
34class RenderTreeBuilder::MultiColumn {
35 WTF_MAKE_FAST_ALLOCATED;
36public:
37 MultiColumn(RenderTreeBuilder&);
38
39 void updateAfterDescendants(RenderBlockFlow&);
40 // Some renderers (column spanners) are moved out of the flow thread to live among column
41 // sets. If |child| is such a renderer, resolve it to the placeholder that lives at the original
42 // location in the tree.
43 RenderObject* resolveMovedChild(RenderFragmentedFlow& enclosingFragmentedFlow, RenderObject* beforeChild);
44 void multiColumnDescendantInserted(RenderMultiColumnFlow&, RenderObject& newDescendant);
45 void multiColumnRelativeWillBeRemoved(RenderMultiColumnFlow&, RenderObject& relative);
46 static RenderObject* adjustBeforeChildForMultiColumnSpannerIfNeeded(RenderObject& beforeChild);
47
48private:
49 void createFragmentedFlow(RenderBlockFlow&);
50 void destroyFragmentedFlow(RenderBlockFlow&);
51 RenderObject* processPossibleSpannerDescendant(RenderMultiColumnFlow&, RenderObject*& subtreeRoot, RenderObject& descendant);
52 void handleSpannerRemoval(RenderMultiColumnFlow&, RenderObject& spanner);
53
54 RenderTreeBuilder& m_builder;
55};
56
57}
58