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| 1 // Copyright 2015 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #include "core/animation/CSSVisibilityInterpolationType.h" |
| 6 |
| 7 #include "core/css/CSSPrimitiveValueMappings.h" |
| 8 #include "core/css/resolver/StyleResolverState.h" |
| 9 |
| 10 namespace blink { |
| 11 |
| 12 class CSSVisibilityNonInterpolableValue : public NonInterpolableValue { |
| 13 public: |
| 14 ~CSSVisibilityNonInterpolableValue() final { } |
| 15 |
| 16 static PassRefPtr<CSSVisibilityNonInterpolableValue> create(EVisibility star
t, EVisibility end) |
| 17 { |
| 18 return adoptRef(new CSSVisibilityNonInterpolableValue(start, end)); |
| 19 } |
| 20 |
| 21 EVisibility visibility() const |
| 22 { |
| 23 ASSERT(m_isSingle); |
| 24 return m_start; |
| 25 } |
| 26 |
| 27 EVisibility visibility(double fraction) const |
| 28 { |
| 29 if (m_isSingle || fraction <= 0) |
| 30 return m_start; |
| 31 if (fraction >= 1) |
| 32 return m_end; |
| 33 if (m_start == VISIBLE || m_end == VISIBLE) |
| 34 return VISIBLE; |
| 35 return fraction < 0.5 ? m_start : m_end; |
| 36 } |
| 37 |
| 38 DECLARE_NON_INTERPOLABLE_VALUE_TYPE(); |
| 39 |
| 40 private: |
| 41 CSSVisibilityNonInterpolableValue(EVisibility start, EVisibility end) |
| 42 : m_start(start) |
| 43 , m_end(end) |
| 44 , m_isSingle(m_start == m_end) |
| 45 { } |
| 46 |
| 47 const EVisibility m_start; |
| 48 const EVisibility m_end; |
| 49 const bool m_isSingle; |
| 50 }; |
| 51 |
| 52 DEFINE_NON_INTERPOLABLE_VALUE_TYPE(CSSVisibilityNonInterpolableValue); |
| 53 DEFINE_NON_INTERPOLABLE_VALUE_TYPE_CASTS(CSSVisibilityNonInterpolableValue); |
| 54 |
| 55 class UnderlyingVisibilityChecker : public InterpolationType::ConversionChecker
{ |
| 56 public: |
| 57 ~UnderlyingVisibilityChecker() final {} |
| 58 |
| 59 static PassOwnPtr<UnderlyingVisibilityChecker> create(const InterpolationTyp
e& type, EVisibility visibility) |
| 60 { |
| 61 return adoptPtr(new UnderlyingVisibilityChecker(type, visibility)); |
| 62 } |
| 63 |
| 64 private: |
| 65 UnderlyingVisibilityChecker(const InterpolationType& type, EVisibility visib
ility) |
| 66 : ConversionChecker(type) |
| 67 , m_visibility(visibility) |
| 68 { } |
| 69 |
| 70 bool isValid(const InterpolationEnvironment&, const UnderlyingValue& underly
ingValue) const final |
| 71 { |
| 72 double underlyingFraction = toInterpolableNumber(underlyingValue->interp
olableValue()).value(); |
| 73 EVisibility underlyingVisibility = toCSSVisibilityNonInterpolableValue(u
nderlyingValue->nonInterpolableValue())->visibility(underlyingFraction); |
| 74 return m_visibility == underlyingVisibility; |
| 75 } |
| 76 |
| 77 const EVisibility m_visibility; |
| 78 }; |
| 79 |
| 80 class ParentVisibilityChecker : public InterpolationType::ConversionChecker { |
| 81 public: |
| 82 static PassOwnPtr<ParentVisibilityChecker> create(const InterpolationType& t
ype, EVisibility visibility) |
| 83 { |
| 84 return adoptPtr(new ParentVisibilityChecker(type, visibility)); |
| 85 } |
| 86 |
| 87 private: |
| 88 ParentVisibilityChecker(const InterpolationType& type, EVisibility visibilit
y) |
| 89 : ConversionChecker(type) |
| 90 , m_visibility(visibility) |
| 91 { } |
| 92 |
| 93 bool isValid(const InterpolationEnvironment& environment, const UnderlyingVa
lue&) const final |
| 94 { |
| 95 return m_visibility == environment.state().parentStyle()->visibility(); |
| 96 } |
| 97 |
| 98 DEFINE_INLINE_VIRTUAL_TRACE() { ConversionChecker::trace(visitor); } |
| 99 |
| 100 const double m_visibility; |
| 101 }; |
| 102 |
| 103 PassOwnPtr<InterpolationValue> CSSVisibilityInterpolationType::createVisibilityV
alue(EVisibility visibility) const |
| 104 { |
| 105 return InterpolationValue::create(*this, InterpolableNumber::create(0), CSSV
isibilityNonInterpolableValue::create(visibility, visibility)); |
| 106 } |
| 107 |
| 108 PassOwnPtr<InterpolationValue> CSSVisibilityInterpolationType::maybeConvertNeutr
al(const UnderlyingValue& underlyingValue, ConversionCheckers& conversionChecker
s) const |
| 109 { |
| 110 double underlyingFraction = toInterpolableNumber(underlyingValue->interpolab
leValue()).value(); |
| 111 EVisibility underlyingVisibility = toCSSVisibilityNonInterpolableValue(under
lyingValue->nonInterpolableValue())->visibility(underlyingFraction); |
| 112 conversionCheckers.append(UnderlyingVisibilityChecker::create(*this, underly
ingVisibility)); |
| 113 return createVisibilityValue(underlyingVisibility); |
| 114 } |
| 115 |
| 116 PassOwnPtr<InterpolationValue> CSSVisibilityInterpolationType::maybeConvertIniti
al() const |
| 117 { |
| 118 return createVisibilityValue(VISIBLE); |
| 119 } |
| 120 |
| 121 PassOwnPtr<InterpolationValue> CSSVisibilityInterpolationType::maybeConvertInher
it(const StyleResolverState& state, ConversionCheckers& conversionCheckers) cons
t |
| 122 { |
| 123 if (!state.parentStyle()) |
| 124 return nullptr; |
| 125 EVisibility inheritedVisibility = state.parentStyle()->visibility(); |
| 126 conversionCheckers.append(ParentVisibilityChecker::create(*this, inheritedVi
sibility)); |
| 127 return createVisibilityValue(inheritedVisibility); |
| 128 } |
| 129 |
| 130 PassOwnPtr<InterpolationValue> CSSVisibilityInterpolationType::maybeConvertValue
(const CSSValue& value, const StyleResolverState& state, ConversionCheckers& con
versionCheckers) const |
| 131 { |
| 132 if (!value.isPrimitiveValue()) |
| 133 return nullptr; |
| 134 |
| 135 const CSSPrimitiveValue& primitiveValue = toCSSPrimitiveValue(value); |
| 136 CSSValueID keyword = primitiveValue.getValueID(); |
| 137 |
| 138 switch (keyword) { |
| 139 case CSSValueHidden: |
| 140 case CSSValueVisible: |
| 141 case CSSValueCollapse: |
| 142 return createVisibilityValue(primitiveValue.convertTo<EVisibility>()); |
| 143 default: |
| 144 return nullptr; |
| 145 } |
| 146 } |
| 147 |
| 148 PassOwnPtr<InterpolationValue> CSSVisibilityInterpolationType::maybeConvertUnder
lyingValue(const InterpolationEnvironment& environment) const |
| 149 { |
| 150 return createVisibilityValue(environment.state().style()->visibility()); |
| 151 } |
| 152 |
| 153 PassOwnPtr<PairwisePrimitiveInterpolation> CSSVisibilityInterpolationType::merge
SingleConversions(InterpolationValue& startValue, InterpolationValue& endValue)
const |
| 154 { |
| 155 return PairwisePrimitiveInterpolation::create( |
| 156 *this, |
| 157 InterpolableNumber::create(0), |
| 158 InterpolableNumber::create(1), |
| 159 CSSVisibilityNonInterpolableValue::create( |
| 160 toCSSVisibilityNonInterpolableValue(startValue.nonInterpolableValue(
))->visibility(), |
| 161 toCSSVisibilityNonInterpolableValue(endValue.nonInterpolableValue())
->visibility())); |
| 162 } |
| 163 |
| 164 void CSSVisibilityInterpolationType::composite(UnderlyingValue& underlyingValue,
double underlyingFraction, const InterpolationValue& value) const |
| 165 { |
| 166 underlyingValue.set(&value); |
| 167 } |
| 168 |
| 169 void CSSVisibilityInterpolationType::apply(const InterpolableValue& interpolable
Value, const NonInterpolableValue* nonInterpolableValue, InterpolationEnvironmen
t& environment) const |
| 170 { |
| 171 // Visibility interpolation has been deferred to application time here due t
o its non-linear behaviour. |
| 172 double fraction = toInterpolableNumber(interpolableValue).value(); |
| 173 EVisibility visibility = toCSSVisibilityNonInterpolableValue(nonInterpolable
Value)->visibility(fraction); |
| 174 environment.state().style()->setVisibility(visibility); |
| 175 } |
| 176 |
| 177 } // namespace blink |
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