The Tor Browser / file comparison
comparison: layout/style/nsMediaFeatures.h
layout/style/nsMediaFeatures.h
- branch
- TOR_BUG_3246
- changeset 6
- 8bccb770b82d
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| -1:000000000000 | 0:59e6784e5b7f |
|---|---|
| 1 /* vim: set shiftwidth=4 tabstop=8 autoindent cindent expandtab: */ | |
| 2 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 3 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 5 | |
| 6 /* the features that media queries can test */ | |
| 7 | |
| 8 #ifndef nsMediaFeatures_h_ | |
| 9 #define nsMediaFeatures_h_ | |
| 10 | |
| 11 #include "nsError.h" | |
| 12 #include "nsCSSProps.h" | |
| 13 | |
| 14 class nsIAtom; | |
| 15 class nsPresContext; | |
| 16 class nsCSSValue; | |
| 17 | |
| 18 struct nsMediaFeature; | |
| 19 typedef nsresult | |
| 20 (* nsMediaFeatureValueGetter)(nsPresContext* aPresContext, | |
| 21 const nsMediaFeature* aFeature, | |
| 22 nsCSSValue& aResult); | |
| 23 | |
| 24 struct nsMediaFeature { | |
| 25 nsIAtom **mName; // extra indirection to point to nsGkAtoms members | |
| 26 | |
| 27 enum RangeType { eMinMaxAllowed, eMinMaxNotAllowed }; | |
| 28 RangeType mRangeType; | |
| 29 | |
| 30 enum ValueType { | |
| 31 // All value types allow eCSSUnit_Null to indicate that no value | |
| 32 // was given (in addition to the types listed below). | |
| 33 eLength, // values are such that nsCSSValue::IsLengthUnit() is true | |
| 34 eInteger, // values are eCSSUnit_Integer | |
| 35 eFloat, // values are eCSSUnit_Number | |
| 36 eBoolInteger,// values are eCSSUnit_Integer (0, -0, or 1 only) | |
| 37 eIntRatio, // values are eCSSUnit_Array of two eCSSUnit_Integer | |
| 38 eResolution, // values are in eCSSUnit_Inch (for dpi), | |
| 39 // eCSSUnit_Pixel (for dppx), or | |
| 40 // eCSSUnit_Centimeter (for dpcm) | |
| 41 eEnumerated, // values are eCSSUnit_Enumerated (uses keyword table) | |
| 42 eIdent // values are eCSSUnit_Ident | |
| 43 // Note that a number of pieces of code (both for parsing and | |
| 44 // for matching of valueless expressions) assume that all numeric | |
| 45 // value types cannot be negative. The parsing code also does | |
| 46 // not allow zeros in eIntRatio types. | |
| 47 }; | |
| 48 ValueType mValueType; | |
| 49 | |
| 50 union { | |
| 51 // In static arrays, it's the first member that's initialized. We | |
| 52 // need that to be void* so we can initialize both other types. | |
| 53 // This member should never be accessed by name. | |
| 54 const void* mInitializer_; | |
| 55 // If mValueType == eEnumerated: const int32_t*: keyword table in | |
| 56 // the same format as the keyword tables in nsCSSProps. | |
| 57 const nsCSSProps::KTableValue* mKeywordTable; | |
| 58 // If mGetter == GetSystemMetric (which implies mValueType == | |
| 59 // eBoolInteger): nsIAtom * const *, for the system metric. | |
| 60 nsIAtom * const * mMetric; | |
| 61 } mData; | |
| 62 | |
| 63 // A function that returns the current value for this feature for a | |
| 64 // given presentation. If it returns eCSSUnit_Null, the feature is | |
| 65 // not present. | |
| 66 nsMediaFeatureValueGetter mGetter; | |
| 67 }; | |
| 68 | |
| 69 class nsMediaFeatures { | |
| 70 public: | |
| 71 // Terminated with an entry whose mName is null. | |
| 72 static const nsMediaFeature features[]; | |
| 73 }; | |
| 74 | |
| 75 #endif /* !defined(nsMediaFeatures_h_) */ |
