1/*
2 * Copyright (C) 2012 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. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#pragma once
27
28#include "RenderFragmentContainer.h"
29
30namespace WebCore {
31
32class RenderFragmentedFlow;
33
34// RenderFragmentContainerSet represents a set of regions that all have the same width and height. It is a "composite region box" that
35// can be used to represent a single run of contiguous regions.
36//
37// By combining runs of same-size columns or pages into a single object, we significantly reduce the number of unique RenderObjects
38// required to represent those objects.
39//
40// This class is abstract and is only intended for use by renderers that generate anonymous runs of identical regions, i.e.,
41// columns and printing. RenderMultiColumnSet and RenderPageSet represent runs of columns and pages respectively.
42//
43// FIXME: For now we derive from RenderFragmentContainer, but this may change at some point.
44
45class RenderFragmentContainerSet : public RenderFragmentContainer {
46 WTF_MAKE_ISO_ALLOCATED(RenderFragmentContainerSet);
47public:
48 void expandToEncompassFragmentedFlowContentsIfNeeded();
49
50protected:
51 RenderFragmentContainerSet(Document&, RenderStyle&&, RenderFragmentedFlow&);
52
53private:
54 void installFragmentedFlow() final;
55
56 const char* renderName() const override = 0;
57
58 bool isRenderFragmentContainerSet() const final { return true; }
59};
60
61} // namespace WebCore
62