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#include "config.h"
32#include "FlexibleBoxAlgorithm.h"
33
34#include "RenderBox.h"
35
36namespace WebCore {
37
38FlexItem::FlexItem(RenderBox& box, LayoutUnit flexBaseContentSize, LayoutUnit hypotheticalMainContentSize, LayoutUnit mainAxisBorderAndPadding, LayoutUnit mainAxisMargin)
39 : box(box)
40 , flexBaseContentSize(flexBaseContentSize)
41 , hypotheticalMainContentSize(hypotheticalMainContentSize)
42 , mainAxisBorderAndPadding(mainAxisBorderAndPadding)
43 , mainAxisMargin(mainAxisMargin)
44 , frozen(false)
45{
46 ASSERT(!box.isOutOfFlowPositioned());
47}
48
49FlexLayoutAlgorithm::FlexLayoutAlgorithm(const RenderStyle& style, LayoutUnit lineBreakLength, const Vector<FlexItem>& allItems)
50 : m_style(style)
51 , m_lineBreakLength(lineBreakLength)
52 , m_allItems(allItems)
53{
54}
55
56bool FlexLayoutAlgorithm::computeNextFlexLine(size_t& nextIndex, Vector<FlexItem>& lineItems, LayoutUnit& sumFlexBaseSize, double& totalFlexGrow, double& totalFlexShrink, double& totalWeightedFlexShrink, LayoutUnit& sumHypotheticalMainSize)
57{
58 lineItems.clear();
59 sumFlexBaseSize = 0_lu;
60 totalFlexGrow = totalFlexShrink = totalWeightedFlexShrink = 0;
61 sumHypotheticalMainSize = 0_lu;
62
63 bool lineHasInFlowItem = false;
64
65 for (; nextIndex < m_allItems.size(); ++nextIndex) {
66 const auto& flexItem = m_allItems[nextIndex];
67 ASSERT(!flexItem.box.isOutOfFlowPositioned());
68 if (isMultiline() && sumHypotheticalMainSize + flexItem.hypotheticalMainAxisMarginBoxSize() > m_lineBreakLength && lineHasInFlowItem)
69 break;
70 lineItems.append(flexItem);
71 lineHasInFlowItem = true;
72 sumFlexBaseSize += flexItem.flexBaseMarginBoxSize();
73 totalFlexGrow += flexItem.box.style().flexGrow();
74 totalFlexShrink += flexItem.box.style().flexShrink();
75 totalWeightedFlexShrink += flexItem.box.style().flexShrink() * flexItem.flexBaseContentSize;
76 sumHypotheticalMainSize += flexItem.hypotheticalMainAxisMarginBoxSize();
77 }
78 ASSERT(lineItems.size() > 0 || nextIndex == m_allItems.size());
79 return lineItems.size() > 0;
80}
81
82} // namespace WebCore
83