1/*
2 * Copyright (C) 2018 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#include "config.h"
27#include "FloatBox.h"
28
29#if ENABLE(LAYOUT_FORMATTING_CONTEXT)
30
31#include <wtf/IsoMallocInlines.h>
32
33namespace WebCore {
34namespace Layout {
35
36WTF_MAKE_ISO_ALLOCATED_IMPL(FloatBox);
37
38FloatBox::FloatBox(const Box& layoutBox, const FloatingState& floatingState, const LayoutState& layoutState)
39 : FloatAvoider(layoutBox, floatingState, layoutState)
40{
41 displayBox().setTopLeft({ initialHorizontalPosition(), initialVerticalPosition() });
42}
43
44Display::Box::Rect FloatBox::rect() const
45{
46 auto rect = displayBox().rect();
47 return { rect.top() - marginBefore(), rect.left() - marginStart(), marginStart() + rect.width() + marginEnd(), marginBefore() + rect.height() + marginAfter() };
48}
49
50PositionInContextRoot FloatBox::horizontalPositionCandidate(HorizontalConstraints horizontalConstraints)
51{
52 auto positionCandidate = isLeftAligned() ? *horizontalConstraints.left : *horizontalConstraints.right - rect().width();
53 positionCandidate += marginStart();
54
55 return { positionCandidate };
56}
57
58PositionInContextRoot FloatBox::verticalPositionCandidate(PositionInContextRoot verticalConstraint)
59{
60 return { verticalConstraint + marginBefore() };
61}
62
63PositionInContextRoot FloatBox::initialVerticalPosition() const
64{
65 // Incoming float cannot be placed higher than existing floats (margin box of the last float).
66 // Take the static position (where the box would go if it wasn't floating) and adjust it with the last float.
67 auto top = displayBox().top() - marginBefore();
68 if (auto lastFloat = floatingState().last())
69 top = std::max(top, lastFloat->rectWithMargin().top());
70 top += marginBefore();
71
72 return { top };
73}
74
75}
76}
77#endif
78