1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
|
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef mozilla_KeyframeUtils_h
#define mozilla_KeyframeUtils_h
#include "nsTArrayForwardDeclare.h" // For nsTArray
#include "js/RootingAPI.h" // For JS::Handle
#include "mozilla/KeyframeEffectParams.h" // SpacingMode
struct JSContext;
class JSObject;
class nsIDocument;
class nsStyleContext;
namespace mozilla {
struct AnimationProperty;
enum class CSSPseudoElementType : uint8_t;
class ErrorResult;
struct Keyframe;
struct PropertyStyleAnimationValuePair;
namespace dom {
class Element;
} // namespace dom
} // namespace mozilla
namespace mozilla {
// Represents the set of property-value pairs on a Keyframe converted to
// computed values.
using ComputedKeyframeValues = nsTArray<PropertyStyleAnimationValuePair>;
/**
* Utility methods for processing keyframes.
*/
class KeyframeUtils
{
public:
/**
* Converts a JS value representing a property-indexed keyframe or a sequence
* of keyframes to an array of Keyframe objects.
*
* @param aCx The JSContext that corresponds to |aFrames|.
* @param aDocument The document to use when parsing CSS properties.
* @param aFrames The JS value, provided as an optional IDL |object?| value,
* that is the keyframe list specification.
* @param aRv (out) Out-param to hold any error returned by this function.
* Must be initially empty.
* @return The set of processed keyframes. If an error occurs, aRv will be
* filled-in with the appropriate error code and an empty array will be
* returned.
*/
static nsTArray<Keyframe>
GetKeyframesFromObject(JSContext* aCx,
nsIDocument* aDocument,
JS::Handle<JSObject*> aFrames,
ErrorResult& aRv);
/**
* Calculate the StyleAnimationValues of properties of each keyframe.
* This involves expanding shorthand properties into longhand properties,
* removing the duplicated properties for each keyframe, and creating an
* array of |property:computed value| pairs for each keyframe.
*
* These computed values are used *both* when computing the final set of
* per-property animation values (see GetAnimationPropertiesFromKeyframes) as
* well when applying paced spacing. By returning these values here, we allow
* the result to be re-used in both operations.
*
* @param aKeyframes The input keyframes.
* @param aElement The context element.
* @param aStyleContext The style context to use when computing values.
* @return The set of ComputedKeyframeValues. The length will be the same as
* aFrames.
*/
static nsTArray<ComputedKeyframeValues>
GetComputedKeyframeValues(const nsTArray<Keyframe>& aKeyframes,
dom::Element* aElement,
nsStyleContext* aStyleContext);
/**
* Fills in the mComputedOffset member of each keyframe in the given array
* using the specified spacing mode.
*
* https://w3c.github.io/web-animations/#spacing-keyframes
*
* @param aKeyframes The set of keyframes to adjust.
* @param aSpacingMode The spacing mode to apply.
* @param aProperty The paced property. Only used when |aSpacingMode| is
* SpacingMode::paced. In all other cases it is ignored and hence may be
* any value, e.g. eCSSProperty_UNKNOWN.
* @param aComputedValues The set of computed keyframe values as returned by
* GetComputedKeyframeValues. Only used when |aSpacingMode| is
* SpacingMode::paced. In all other cases this parameter is unused and may
* be any value including an empty array.
* @param aStyleContext The style context used for calculating paced spacing
* on transform.
*/
static void ApplySpacing(nsTArray<Keyframe>& aKeyframes,
SpacingMode aSpacingMode,
nsCSSPropertyID aProperty,
nsTArray<ComputedKeyframeValues>& aComputedValues,
nsStyleContext* aStyleContext);
/**
* Wrapper for ApplySpacing to simplify using distribute spacing.
*
* @param aKeyframes The set of keyframes to adjust.
*/
static void ApplyDistributeSpacing(nsTArray<Keyframe>& aKeyframes);
/**
* Converts an array of Keyframe objects into an array of AnimationProperty
* objects. This involves creating an array of computed values for each
* longhand property and determining the offset and timing function to use
* for each value.
*
* @param aKeyframes The input keyframes.
* @param aComputedValues The computed keyframe values (as returned by
* GetComputedKeyframeValues) used to fill in the individual
* AnimationPropertySegment objects. Although these values could be
* calculated from |aKeyframes|, passing them in as a separate parameter
* allows the result of GetComputedKeyframeValues to be re-used both
* here and in ApplySpacing.
* @param aStyleContext The style context to calculate the style difference.
* @return The set of animation properties. If an error occurs, the returned
* array will be empty.
*/
static nsTArray<AnimationProperty> GetAnimationPropertiesFromKeyframes(
const nsTArray<Keyframe>& aKeyframes,
const nsTArray<ComputedKeyframeValues>& aComputedValues,
nsStyleContext* aStyleContext);
/**
* Check if the property or, for shorthands, one or more of
* its subproperties, is animatable.
*
* @param aProperty The property to check.
* @return true if |aProperty| is animatable.
*/
static bool IsAnimatableProperty(nsCSSPropertyID aProperty);
};
} // namespace mozilla
#endif // mozilla_KeyframeUtils_h
|
