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1 // Copyright 2016 The Chromium Authors. All rights reserved. | 1 // Copyright 2016 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include "core/observer/ResizeObservation.h" | 5 #include "core/observer/ResizeObservation.h" |
6 | 6 |
7 #include "core/layout/LayoutBox.h" | 7 #include "core/layout/LayoutBox.h" |
8 #include "core/observer/ResizeObserver.h" | 8 #include "core/observer/ResizeObserver.h" |
9 #include "core/svg/SVGElement.h" | 9 #include "core/svg/SVGElement.h" |
10 #include "core/svg/SVGGraphicsElement.h" | 10 #include "core/svg/SVGGraphicsElement.h" |
11 | 11 |
12 namespace blink { | 12 namespace blink { |
13 | 13 |
14 ResizeObservation::ResizeObservation(Element* target, ResizeObserver* observer) | 14 ResizeObservation::ResizeObservation(Element* target, ResizeObserver* observer) |
15 : m_target(target) | 15 : m_target(target) |
16 , m_observer(observer) | 16 , m_observer(observer) |
17 , m_observationSize(0, 0) | 17 , m_observationSize(0, 0) |
| 18 , m_elementSizeChanged(true) |
18 { | 19 { |
19 DCHECK(m_target); | 20 DCHECK(m_target); |
| 21 m_observer->elementSizeChanged(); |
20 } | 22 } |
21 | 23 |
22 void ResizeObservation::setObservationSize(const LayoutSize& size) | 24 void ResizeObservation::setObservationSize(const LayoutSize& size) |
23 { | 25 { |
24 m_observationSize = size; | 26 m_observationSize = size; |
| 27 m_elementSizeChanged = false; |
25 } | 28 } |
26 | 29 |
27 bool ResizeObservation::observationSizeOutOfSync() const | 30 bool ResizeObservation::observationSizeOutOfSync() const |
28 { | 31 { |
29 return m_observationSize != ResizeObservation::getTargetSize(m_target); | 32 return m_elementSizeChanged && m_observationSize != ResizeObservation::getTa
rgetSize(m_target); |
30 } | 33 } |
31 | 34 |
32 size_t ResizeObservation::targetDepth() | 35 size_t ResizeObservation::targetDepth() |
33 { | 36 { |
34 unsigned depth = 0; | 37 unsigned depth = 0; |
35 for (Element* parent = m_target; parent; parent = parent->parentElement()) | 38 for (Element* parent = m_target; parent; parent = parent->parentElement()) |
36 ++depth; | 39 ++depth; |
37 return depth; | 40 return depth; |
38 } | 41 } |
39 | 42 |
40 LayoutSize ResizeObservation::getTargetSize(Element* target) // static | 43 LayoutSize ResizeObservation::getTargetSize(Element* target) // static |
41 { | 44 { |
42 if (target) { | 45 if (target) { |
43 if (target->isSVGElement() && toSVGElement(target)->isSVGGraphicsElement
()) { | 46 if (target->isSVGElement() && toSVGElement(target)->isSVGGraphicsElement
()) { |
44 SVGGraphicsElement& svg = toSVGGraphicsElement(*target); | 47 SVGGraphicsElement& svg = toSVGGraphicsElement(*target); |
45 return LayoutSize(svg.getBBox().size()); | 48 return LayoutSize(svg.getBBox().size()); |
46 } | 49 } |
47 LayoutBox* layout = target->layoutBox(); | 50 LayoutBox* layout = target->layoutBox(); |
48 if (layout) | 51 if (layout) |
49 return layout->contentSize(); | 52 return layout->contentSize(); |
50 } | 53 } |
51 return LayoutSize(); | 54 return LayoutSize(); |
52 } | 55 } |
53 | 56 |
| 57 void ResizeObservation::elementSizeChanged() |
| 58 { |
| 59 m_elementSizeChanged = true; |
| 60 m_observer->elementSizeChanged(); |
| 61 } |
54 | 62 |
55 DEFINE_TRACE(ResizeObservation) | 63 DEFINE_TRACE(ResizeObservation) |
56 { | 64 { |
57 visitor->trace(m_target); | 65 visitor->trace(m_target); |
58 visitor->trace(m_observer); | 66 visitor->trace(m_observer); |
59 } | 67 } |
60 | 68 |
61 } // namespace blink | 69 } // namespace blink |
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