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126 lines
5.3 KiB
C++
126 lines
5.3 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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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 the Mozilla SMIL module.
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*
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* The Initial Developer of the Original Code is the Mozilla Corporation.
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* Portions created by the Initial Developer are Copyright (C) 2009
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Daniel Holbert <dholbert@mozilla.com>
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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 of the GNU General Public License Version 2 or later (the "GPL"),
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* or 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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/* representation of a value for a SMIL-animated CSS property */
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#ifndef NS_SMILCSSVALUETYPE_H_
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#define NS_SMILCSSVALUETYPE_H_
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#include "nsISMILType.h"
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#include "nsCSSProperty.h"
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#include "nscore.h" // For NS_OVERRIDE
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class nsPresContext;
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class nsIContent;
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class nsAString;
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/*
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* nsSMILCSSValueType: Represents a SMIL-animated CSS value.
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*/
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class nsSMILCSSValueType : public nsISMILType
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{
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public:
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// Singleton for nsSMILValue objects to hold onto.
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static nsSMILCSSValueType sSingleton;
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protected:
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// nsISMILType Methods
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// -------------------
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NS_OVERRIDE virtual void Init(nsSMILValue& aValue) const;
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NS_OVERRIDE virtual void Destroy(nsSMILValue&) const;
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NS_OVERRIDE virtual nsresult Assign(nsSMILValue& aDest,
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const nsSMILValue& aSrc) const;
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NS_OVERRIDE virtual PRBool IsEqual(const nsSMILValue& aLeft,
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const nsSMILValue& aRight) const;
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NS_OVERRIDE virtual nsresult Add(nsSMILValue& aDest,
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const nsSMILValue& aValueToAdd,
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PRUint32 aCount) const;
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NS_OVERRIDE virtual nsresult ComputeDistance(const nsSMILValue& aFrom,
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const nsSMILValue& aTo,
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double& aDistance) const;
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NS_OVERRIDE virtual nsresult Interpolate(const nsSMILValue& aStartVal,
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const nsSMILValue& aEndVal,
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double aUnitDistance,
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nsSMILValue& aResult) const;
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public:
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// Helper Methods
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// --------------
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/**
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* Sets up the given nsSMILValue to represent the given string value. The
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* string is interpreted as a value for the given property on the given
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* element.
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*
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* On failure, this method leaves aValue.mType == nsSMILNullType::sSingleton.
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* Otherwise, this method leaves aValue.mType == this class's singleton.
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*
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* @param aPropID The property for which we're parsing a value.
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* @param aTargetElement The target element to whom the property/value
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* setting applies.
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* @param aString The string to be parsed as a CSS value.
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* @param [out] aValue The nsSMILValue to be populated. Should
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* initially be null-typed.
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* @pre aValue.IsNull()
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* @post aValue.IsNull() || aValue.mType == nsSMILCSSValueType::sSingleton
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*/
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static void ValueFromString(nsCSSProperty aPropID,
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nsIContent* aTargetElement,
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const nsAString& aString, nsSMILValue& aValue);
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/**
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* Creates a string representation of the given nsSMILValue.
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*
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* Note: aValue is expected to be of this type (that is, it's expected to
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* have been initialized by nsSMILCSSValueType::sSingleton). If aValue is a
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* freshly-initialized value, this method will succeed, though the resulting
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* string will be empty.
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*
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* @param aValue The nsSMILValue to be converted into a string.
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* @param [out] aString The string to be populated with the given value.
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* @return PR_TRUE on success, PR_FALSE on failure.
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*/
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static PRBool ValueToString(const nsSMILValue& aValue, nsAString& aString);
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private:
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// Private constructor & destructor: prevent instances beyond my singleton,
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// and prevent others from deleting my singleton.
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nsSMILCSSValueType() {}
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~nsSMILCSSValueType() {}
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};
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#endif // NS_SMILCSSVALUETYPE_H_
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