gecko/content/smil/nsSMILCSSValueType.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is the Mozilla SMIL module.
*
* The Initial Developer of the Original Code is the Mozilla Corporation.
* Portions created by the Initial Developer are Copyright (C) 2009
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Daniel Holbert <dholbert@mozilla.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
/* representation of a value for a SMIL-animated CSS property */
#ifndef NS_SMILCSSVALUETYPE_H_
#define NS_SMILCSSVALUETYPE_H_
#include "nsISMILType.h"
#include "nsCSSProperty.h"
#include "nscore.h" // For NS_OVERRIDE
class nsIContent;
class nsAString;
/*
* nsSMILCSSValueType: Represents a SMIL-animated CSS value.
*/
class nsSMILCSSValueType : public nsISMILType
{
public:
// Singleton for nsSMILValue objects to hold onto.
static nsSMILCSSValueType sSingleton;
protected:
// nsISMILType Methods
// -------------------
NS_OVERRIDE virtual void Init(nsSMILValue& aValue) const;
NS_OVERRIDE virtual void Destroy(nsSMILValue&) const;
NS_OVERRIDE virtual nsresult Assign(nsSMILValue& aDest,
const nsSMILValue& aSrc) const;
NS_OVERRIDE virtual PRBool IsEqual(const nsSMILValue& aLeft,
const nsSMILValue& aRight) const;
NS_OVERRIDE virtual nsresult Add(nsSMILValue& aDest,
const nsSMILValue& aValueToAdd,
PRUint32 aCount) const;
NS_OVERRIDE virtual nsresult ComputeDistance(const nsSMILValue& aFrom,
const nsSMILValue& aTo,
double& aDistance) const;
NS_OVERRIDE virtual nsresult Interpolate(const nsSMILValue& aStartVal,
const nsSMILValue& aEndVal,
double aUnitDistance,
nsSMILValue& aResult) const;
public:
// Helper Methods
// --------------
/**
* Sets up the given nsSMILValue to represent the given string value. The
* string is interpreted as a value for the given property on the given
* element.
*
* On failure, this method leaves aValue.mType == nsSMILNullType::sSingleton.
* Otherwise, this method leaves aValue.mType == this class's singleton.
*
* @param aPropID The property for which we're parsing a value.
* @param aTargetElement The target element to whom the property/value
* setting applies.
* @param aString The string to be parsed as a CSS value.
* @param [out] aValue The nsSMILValue to be populated. Should
* initially be null-typed.
* @pre aValue.IsNull()
* @post aValue.IsNull() || aValue.mType == nsSMILCSSValueType::sSingleton
*/
static void ValueFromString(nsCSSProperty aPropID,
nsIContent* aTargetElement,
const nsAString& aString,
nsSMILValue& aValue);
/**
* Creates a string representation of the given nsSMILValue.
*
* Note: aValue is expected to be of this type (that is, it's expected to
* have been initialized by nsSMILCSSValueType::sSingleton). If aValue is a
* freshly-initialized value, this method will succeed, though the resulting
* string will be empty.
*
* @param aValue The nsSMILValue to be converted into a string.
* @param [out] aString The string to be populated with the given value.
* @return PR_TRUE on success, PR_FALSE on failure.
*/
static PRBool ValueToString(const nsSMILValue& aValue, nsAString& aString);
private:
// Private constructor & destructor: prevent instances beyond my singleton,
// and prevent others from deleting my singleton.
nsSMILCSSValueType() {}
~nsSMILCSSValueType() {}
};
#endif // NS_SMILCSSVALUETYPE_H_