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189 lines
7.6 KiB
C++
189 lines
7.6 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 nsStyleAnimation.
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*
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* The Initial Developer of the Original Code is
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* 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>, Mozilla Corporation
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* L. David Baron <dbaron@dbaron.org>, Mozilla Corporation
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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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/* Utilities for animation of computed style values */
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#ifndef nsStyleAnimation_h_
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#define nsStyleAnimation_h_
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#include "prtypes.h"
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#include "nsAString.h"
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#include "nsCSSProperty.h"
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class nsCSSDeclaration;
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class nsIContent;
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class nsPresContext;
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class nsStyleCoord;
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class nsStyleContext;
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/**
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* Utility class to handle animated style values
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*/
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class nsStyleAnimation {
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public:
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// Mathematical methods
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// --------------------
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/**
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* Adds |aCount| copies of |aValueToAdd| to |aDest|. The result of this
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* addition is stored in aDest.
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*
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* Note that if |aCount| is 0, then |aDest| will be unchanged. Also, if
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* this method fails, then |aDest| will be unchanged.
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*
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* @param aDest The value to add to.
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* @param aValueToAdd The value to add.
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* @param aCount The number of times to add aValueToAdd.
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* @return PR_TRUE on success, PR_FALSE on failure.
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*/
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static PRBool Add(nsStyleCoord& aDest, const nsStyleCoord& aValueToAdd,
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PRUint32 aCount);
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/**
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* Calculates a measure of 'distance' between two values.
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*
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* If this method succeeds, the returned distance value is guaranteed to be
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* non-negative.
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*
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* @param aStartValue The start of the interval for which the distance
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* should be calculated.
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* @param aEndValue The end of the interval for which the distance
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* should be calculated.
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* @param aDistance The result of the calculation.
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* @return PR_TRUE on success, PR_FALSE on failure.
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*/
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static PRBool ComputeDistance(const nsStyleCoord& aStartValue,
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const nsStyleCoord& aEndValue,
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double& aDistance);
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/**
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* Calculates an interpolated value that is the specified |aPortion| between
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* the two given values.
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*
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* This really just does the following calculation:
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* aResultValue = (1.0 - aPortion) * aStartValue + aPortion * aEndValue
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*
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* @param aStartValue The value defining the start of the interval of
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* interpolation.
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* @param aEndValue The value defining the end of the interval of
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* interpolation.
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* @param aPortion A number in the range [0.0, 1.0] defining the
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* distance of the interpolated value in the interval.
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* @param [out] aResultValue The resulting interpolated value.
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* @return PR_TRUE on success, PR_FALSE on failure.
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*/
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static PRBool Interpolate(const nsStyleCoord& aStartValue,
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const nsStyleCoord& aEndValue,
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double aPortion,
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nsStyleCoord& aResultValue);
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// Type-conversion methods
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// -----------------------
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/**
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* Creates a computed value (nsStyleCoord) for the given specified value
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* (property ID + string). A style context is needed in case the
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* specified value depends on inherited style or on the values of other
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* properties.
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*
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* NOTE: This method uses GetPrimaryShell() to access the style system,
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* so it should only be used for style that applies to all presentations,
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* rather than for style that only applies to a particular presentation.
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* XXX Once we get rid of multiple presentations, we can remove the above
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* note.
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*
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* @param aProperty The property whose value we're computing.
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* @param aTargetElement The content node to which our computed value is
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* applicable.
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* @param aSpecifiedValue The specified value, from which we'll build our
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* computed value.
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* @param [out] aComputedValue The resulting computed value.
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* @return PR_TRUE on success, PR_FALSE on failure.
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*/
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static PRBool ComputeValue(nsCSSProperty aProperty,
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nsIContent* aElement,
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const nsAString& aSpecifiedValue,
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nsStyleCoord& aComputedValue);
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/**
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* Creates a specified value (nsAString) for the given computed value
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* (nsStyleCoord).
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*
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* @param aProperty The property whose value we're uncomputing.
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* @param aPresContext The presentation context for the document in
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* which we're working.
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* @param aComputedValue The computed value to be converted.
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* @param [out] aSpecifiedValue The resulting specified value.
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* @return PR_TRUE on success, PR_FALSE on failure.
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*/
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static PRBool UncomputeValue(nsCSSProperty aProperty,
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nsPresContext* aPresContext,
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const nsStyleCoord& aComputedValue,
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nsAString& aSpecifiedValue);
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/**
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* Gets the computed value for the given property from the given style
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* context.
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*
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* @param aProperty The property whose value we're looking up.
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* @param aStyleContext The style context to check for the computed value.
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* @param [out] aComputedValue The resulting computed value.
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* @return PR_TRUE on success, PR_FALSE on failure.
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*/
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static PRBool ExtractComputedValue(nsCSSProperty aProperty,
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nsStyleContext* aStyleContext,
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nsStyleCoord& aComputedValue);
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/**
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* Sets the computed value for the given property in the given style
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* struct.
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*
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* @param aProperty The property whose value we're setting.
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* @param aPresContext The pres context associated with aStyleStruct.
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* @param aStyleStruct The style struct in which to set the value.
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* @param aComputedValue The computed value.
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* @return PR_TRUE on success, PR_FALSE on failure.
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*/
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static PRBool StoreComputedValue(nsCSSProperty aProperty,
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nsPresContext* aPresContext,
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void* aStyleStruct,
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const nsStyleCoord& aComputedValue);
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};
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#endif
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