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105 lines
4.2 KiB
C++
105 lines
4.2 KiB
C++
/* vim: set shiftwidth=4 tabstop=8 autoindent cindent expandtab: */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is nsMediaFeatures.
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*
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* The Initial Developer of the Original Code is the Mozilla Foundation.
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* Portions created by the Initial Developer are Copyright (C) 2008
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* L. David Baron <dbaron@dbaron.org>, Mozilla Corporation (original author)
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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/* the features that media queries can test */
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#ifndef nsMediaFeatures_h_
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#define nsMediaFeatures_h_
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#include "nscore.h"
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class nsIAtom;
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class nsPresContext;
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class nsCSSValue;
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struct nsMediaFeature;
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typedef nsresult
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(* nsMediaFeatureValueGetter)(nsPresContext* aPresContext,
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const nsMediaFeature* aFeature,
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nsCSSValue& aResult);
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struct nsMediaFeature {
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nsIAtom **mName; // extra indirection to point to nsGkAtoms members
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enum RangeType { eMinMaxAllowed, eMinMaxNotAllowed };
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RangeType mRangeType;
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enum ValueType {
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// All value types allow eCSSUnit_Null to indicate that no value
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// was given (in addition to the types listed below).
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eLength, // values are such that nsCSSValue::IsLengthUnit() is true
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eInteger, // values are eCSSUnit_Integer
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eBoolInteger,// values are eCSSUnit_Integer (0, -0, or 1 only)
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eIntRatio, // values are eCSSUnit_Array of two eCSSUnit_Integer
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eResolution, // values are in eCSSUnit_Inch (for dpi) or
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// eCSSUnit_Centimeter (for dpcm)
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eEnumerated // values are eCSSUnit_Enumerated (uses keyword table)
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// Note that a number of pieces of code (both for parsing and
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// for matching of valueless expressions) assume that all numeric
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// value types cannot be negative. The parsing code also does
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// not allow zeros in eIntRatio types.
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};
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ValueType mValueType;
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union {
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// In static arrays, it's the first member that's initialized. We
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// need that to be void* so we can initialize both other types.
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// This member should never be accessed by name.
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const void* mInitializer_;
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// If mValueType == eEnumerated: const PRInt32*: keyword table in
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// the same format as the keyword tables in nsCSSProps.
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const PRInt32* mKeywordTable;
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// If mGetter == GetSystemMetric (which implies mValueType ==
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// eBoolInteger): nsIAtom * const *, for the system metric.
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nsIAtom * const * mMetric;
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} mData;
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// A function that returns the current value for this feature for a
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// given presentation. If it returns eCSSUnit_Null, the feature is
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// not present.
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nsMediaFeatureValueGetter mGetter;
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};
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class nsMediaFeatures {
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public:
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// Terminated with an entry whose mName is null.
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static const nsMediaFeature features[];
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};
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#endif /* !defined(nsMediaFeatures_h_) */
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