1/*
2 * Copyright (C) 2011 Google 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 are
6 * met:
7 *
8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above
11 * copyright notice, this list of conditions and the following disclaimer
12 * in the documentation and/or other materials provided with the
13 * distribution.
14 * * Neither the name of Google Inc. nor the names of its
15 * contributors may be used to endorse or promote products derived from
16 * this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31#pragma once
32
33#include "LayoutUnit.h"
34#include "RenderStyle.h"
35#include <wtf/Forward.h>
36#include <wtf/Noncopyable.h>
37
38namespace WebCore {
39
40class RenderBox;
41
42class FlexItem {
43public:
44 FlexItem(RenderBox&, LayoutUnit flexBaseContentSize, LayoutUnit hypotheticalMainContentSize, LayoutUnit mainAxisBorderAndPadding, LayoutUnit mainAxisMargin);
45
46 LayoutUnit hypotheticalMainAxisMarginBoxSize() const
47 {
48 return hypotheticalMainContentSize + mainAxisBorderAndPadding + mainAxisMargin;
49 }
50
51 LayoutUnit flexBaseMarginBoxSize() const
52 {
53 return flexBaseContentSize + mainAxisBorderAndPadding + mainAxisMargin;
54 }
55
56 LayoutUnit flexedMarginBoxSize() const
57 {
58 return flexedContentSize + mainAxisBorderAndPadding + mainAxisMargin;
59 }
60
61 RenderBox& box;
62 const LayoutUnit flexBaseContentSize;
63 const LayoutUnit hypotheticalMainContentSize;
64 const LayoutUnit mainAxisBorderAndPadding;
65 const LayoutUnit mainAxisMargin;
66 LayoutUnit flexedContentSize;
67 bool frozen;
68};
69
70class FlexLayoutAlgorithm {
71 WTF_MAKE_NONCOPYABLE(FlexLayoutAlgorithm);
72
73public:
74 FlexLayoutAlgorithm(const RenderStyle&, LayoutUnit lineBreakLength, const Vector<FlexItem>& allItems);
75
76 // The hypothetical main size of an item is the flex base size clamped
77 // according to its min and max main size properties
78 bool computeNextFlexLine(size_t& nextIndex, Vector<FlexItem>& lineItems, LayoutUnit& sumFlexBaseSize, double& totalFlexGrow, double& totalFlexShrink, double& totalWeightedFlexShrink, LayoutUnit& sumHypotheticalMainSize);
79
80private:
81 bool isMultiline() const { return m_style.flexWrap() != FlexWrap::NoWrap; }
82
83 const RenderStyle& m_style;
84 LayoutUnit m_lineBreakLength;
85 const Vector<FlexItem>& m_allItems;
86};
87
88} // namespace WebCore
89
90