1/*
2 * Copyright (C) 2019 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. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#pragma once
27
28#include "CSSComputedStyleDeclaration.h"
29#include "CSSPropertyParser.h"
30#include "SVGAttributeAnimator.h"
31#include "SVGElement.h"
32
33namespace WebCore {
34
35template<typename AnimationFunction>
36class SVGPropertyAnimator : public SVGAttributeAnimator {
37public:
38 bool isDiscrete() const override { return m_function.isDiscrete(); }
39
40 void setFromAndToValues(SVGElement* targetElement, const String& from, const String& to) override
41 {
42 m_function.setFromAndToValues(targetElement, adjustForInheritance(targetElement, from), adjustForInheritance(targetElement, to));
43 }
44
45 void setFromAndByValues(SVGElement* targetElement, const String& from, const String& by) override
46 {
47 m_function.setFromAndByValues(targetElement, from, by);
48 }
49
50 void setToAtEndOfDurationValue(const String& toAtEndOfDuration) override
51 {
52 m_function.setToAtEndOfDurationValue(toAtEndOfDuration);
53 }
54
55protected:
56 template<typename... Arguments>
57 SVGPropertyAnimator(const QualifiedName& attributeName, Arguments&&... arguments)
58 : SVGAttributeAnimator(attributeName)
59 , m_function(std::forward<Arguments>(arguments)...)
60 {
61 }
62
63 void stop(SVGElement* targetElement) override
64 {
65 removeAnimatedStyleProperty(targetElement);
66 }
67
68 Optional<float> calculateDistance(SVGElement* targetElement, const String& from, const String& to) const override
69 {
70 return m_function.calculateDistance(targetElement, from, to);
71 }
72
73 String adjustForInheritance(SVGElement* targetElement, const String& value) const
74 {
75 static NeverDestroyed<const AtomicString> inherit("inherit", AtomicString::ConstructFromLiteral);
76 return value == inherit ? computeInheritedCSSPropertyValue(targetElement) : value;
77 }
78
79 String computeCSSPropertyValue(SVGElement* targetElement, CSSPropertyID id) const
80 {
81 ASSERT(targetElement);
82
83 // Don't include any properties resulting from CSS Transitions/Animations or SMIL animations, as we want to retrieve the "base value".
84 targetElement->setUseOverrideComputedStyle(true);
85 RefPtr<CSSValue> value = ComputedStyleExtractor(targetElement).propertyValue(id);
86 targetElement->setUseOverrideComputedStyle(false);
87 return value ? value->cssText() : String();
88 }
89
90 String computeInheritedCSSPropertyValue(SVGElement* targetElement) const
91 {
92 ASSERT(targetElement);
93 auto parent = makeRefPtr(targetElement->parentElement());
94 if (!parent || !parent->isSVGElement())
95 return emptyString();
96
97 SVGElement& svgParent = downcast<SVGElement>(*parent);
98 return computeCSSPropertyValue(&svgParent, cssPropertyID(m_attributeName.localName()));
99 }
100
101 AnimationFunction m_function;
102};
103
104}
105