1/*
2 * Copyright (C) 2011 Adobe Systems Incorporated. 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 *
8 * 1. Redistributions of source code must retain the above
9 *    copyright notice, this list of conditions and the following
10 *    disclaimer.
11 * 2. Redistributions in binary form must reproduce the above
12 *    copyright notice, this list of conditions and the following
13 *    disclaimer in the documentation and/or other materials
14 *    provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER “AS IS” AND ANY
17 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE
20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
21 * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
22 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
23 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
25 * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
26 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#ifndef RenderRegion_h
31#define RenderRegion_h
32
33#include "core/rendering/RenderBlockFlow.h"
34#include "core/rendering/style/StyleInheritedData.h"
35
36namespace blink {
37
38struct LayerFragment;
39typedef Vector<LayerFragment, 1> LayerFragments;
40class RenderFlowThread;
41
42class RenderRegion : public RenderBlockFlow {
43public:
44    explicit RenderRegion(Element*, RenderFlowThread*);
45
46    virtual bool isRenderRegion() const OVERRIDE FINAL { return true; }
47
48    void setFlowThreadPortionRect(const LayoutRect& rect) { m_flowThreadPortionRect = rect; }
49    LayoutRect flowThreadPortionRect() const { return m_flowThreadPortionRect; }
50    LayoutRect flowThreadPortionOverflowRect() const;
51
52    RenderFlowThread* flowThread() const { return m_flowThread; }
53
54    // Valid regions do not create circular dependencies with other flows.
55    bool isValid() const { return m_isValid; }
56    void setIsValid(bool valid) { m_isValid = valid; }
57
58    bool isFirstRegion() const;
59    bool isLastRegion() const;
60
61    // These methods represent the width and height of a "page" and for a RenderRegion they are just
62    // the content width and content height of a region. For RenderMultiColumnSets, however, they
63    // will be the width and height of a single column or page in the set.
64    virtual LayoutUnit pageLogicalWidth() const;
65    virtual LayoutUnit pageLogicalHeight() const;
66
67    virtual bool canHaveChildren() const OVERRIDE FINAL { return false; }
68    virtual bool canHaveGeneratedChildren() const OVERRIDE FINAL { return true; }
69
70    virtual const char* renderName() const OVERRIDE { return "RenderRegion"; }
71
72protected:
73    virtual void computeIntrinsicLogicalWidths(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth) const OVERRIDE FINAL;
74
75    LayoutRect overflowRectForFlowThreadPortion(const LayoutRect& flowThreadPortionRect, bool isFirstPortion, bool isLastPortion) const;
76    void paintInvalidationOfFlowThreadContentRectangle(const LayoutRect& paintInvalidationRect, const LayoutRect& flowThreadPortionRect,
77        const LayoutRect& flowThreadPortionOverflowRect, const LayoutPoint& regionLocation) const;
78
79private:
80    virtual void layoutBlock(bool relayoutChildren) OVERRIDE FINAL;
81
82protected:
83    RenderFlowThread* m_flowThread;
84
85private:
86    LayoutRect m_flowThreadPortionRect;
87    bool m_isValid : 1;
88};
89
90DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderRegion, isRenderRegion());
91
92} // namespace blink
93
94#endif // RenderRegion_h
95