зеркало из https://github.com/mozilla/gecko-dev.git
399 строки
15 KiB
C++
399 строки
15 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 "nsCRTGlue.h"
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#include "nsStringBuffer.h"
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#include "nsCSSProperty.h"
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#include "nsCoord.h"
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#include "nsColor.h"
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class nsIContent;
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class nsPresContext;
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class nsStyleContext;
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class nsCSSValue;
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struct nsCSSValueList;
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struct nsCSSValuePair;
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struct nsCSSValuePairList;
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struct nsCSSRect;
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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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class Value;
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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(nsCSSProperty aProperty, Value& aDest,
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const Value& aValueToAdd, PRUint32 aCount) {
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return AddWeighted(aProperty, 1.0, aDest, aCount, aValueToAdd, aDest);
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}
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/**
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* Calculates a measure of 'distance' between two values.
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*
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* This measure of Distance is guaranteed to be proportional to
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* portions passed to Interpolate, Add, or AddWeighted. However, for
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* some types of Value it may not produce sensible results for paced
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* animation.
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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(nsCSSProperty aProperty,
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const Value& aStartValue,
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const Value& 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(nsCSSProperty aProperty,
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const Value& aStartValue,
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const Value& aEndValue,
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double aPortion,
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Value& aResultValue) {
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return AddWeighted(aProperty, 1.0 - aPortion, aStartValue,
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aPortion, aEndValue, aResultValue);
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}
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/**
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* Does the calculation:
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* aResultValue = aCoeff1 * aValue1 + aCoeff2 * aValue2
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*
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* @param [out] aResultValue The resulting interpolated value. May be
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* the same as aValue1 or aValue2.
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* @return PR_TRUE on success, PR_FALSE on failure.
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*
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* NOTE: Current callers always pass aCoeff1 and aCoeff2 >= 0. They
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* are currently permitted to be negative; however, if, as we add
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* support more value types types, we find that this causes
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* difficulty, we might change this to restrict them to being
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* positive.
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*/
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static PRBool AddWeighted(nsCSSProperty aProperty,
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double aCoeff1, const Value& aValue1,
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double aCoeff2, const Value& aValue2,
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Value& aResultValue);
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// Type-conversion methods
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// -----------------------
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/**
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* Creates a computed value 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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* @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 aUseSVGMode A flag to indicate whether we should parse
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* |aSpecifiedValue| in SVG mode.
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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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PRBool aUseSVGMode,
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Value& aComputedValue);
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/**
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* Creates a specified value for the given computed value.
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*
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* The first overload fills in an nsCSSValue object; the second
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* produces a string. The nsCSSValue result may depend on objects
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* owned by the |aComputedValue| object, so users of that variant
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* must keep |aComputedValue| alive longer than |aSpecifiedValue|.
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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 Value& aComputedValue,
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nsCSSValue& aSpecifiedValue);
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static PRBool UncomputeValue(nsCSSProperty aProperty,
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nsPresContext* aPresContext,
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const Value& 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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Value& aComputedValue);
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/**
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* The types and values for the values that we extract and animate.
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*/
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enum Unit {
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eUnit_Null, // not initialized
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eUnit_Normal,
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eUnit_Auto,
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eUnit_None,
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eUnit_Enumerated,
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eUnit_Visibility, // special case for transitions (which converts
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// Enumerated to Visibility as needed)
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eUnit_Integer,
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eUnit_Coord,
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eUnit_Percent,
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eUnit_Float,
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eUnit_Color,
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eUnit_Calc, // nsCSSValue* (never null), always with a single
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// calc() expression that's either length or length+percent
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eUnit_CSSValuePair, // nsCSSValuePair* (never null)
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eUnit_CSSRect, // nsCSSRect* (never null)
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eUnit_Dasharray, // nsCSSValueList* (never null)
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eUnit_Shadow, // nsCSSValueList* (may be null)
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eUnit_Transform, // nsCSSValueList* (never null)
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eUnit_CSSValuePairList, // nsCSSValuePairList* (never null)
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eUnit_UnparsedString // nsStringBuffer* (never null)
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};
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class Value {
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private:
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Unit mUnit;
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union {
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PRInt32 mInt;
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nscoord mCoord;
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float mFloat;
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nscolor mColor;
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nsCSSValue* mCSSValue;
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nsCSSValuePair* mCSSValuePair;
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nsCSSRect* mCSSRect;
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nsCSSValueList* mCSSValueList;
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nsCSSValuePairList* mCSSValuePairList;
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nsStringBuffer* mString;
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} mValue;
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public:
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Unit GetUnit() const {
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NS_ASSERTION(mUnit != eUnit_Null, "uninitialized");
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return mUnit;
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}
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// Accessor to let us verify assumptions about presence of null unit,
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// without tripping the assertion in GetUnit().
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PRBool IsNull() const {
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return mUnit == eUnit_Null;
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}
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PRInt32 GetIntValue() const {
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NS_ASSERTION(IsIntUnit(mUnit), "unit mismatch");
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return mValue.mInt;
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}
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nscoord GetCoordValue() const {
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NS_ASSERTION(mUnit == eUnit_Coord, "unit mismatch");
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return mValue.mCoord;
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}
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float GetPercentValue() const {
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NS_ASSERTION(mUnit == eUnit_Percent, "unit mismatch");
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return mValue.mFloat;
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}
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float GetFloatValue() const {
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NS_ASSERTION(mUnit == eUnit_Float, "unit mismatch");
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return mValue.mFloat;
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}
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nscolor GetColorValue() const {
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NS_ASSERTION(mUnit == eUnit_Color, "unit mismatch");
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return mValue.mColor;
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}
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nsCSSValue* GetCSSValueValue() const {
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NS_ASSERTION(IsCSSValueUnit(mUnit), "unit mismatch");
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return mValue.mCSSValue;
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}
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nsCSSValuePair* GetCSSValuePairValue() const {
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NS_ASSERTION(IsCSSValuePairUnit(mUnit), "unit mismatch");
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return mValue.mCSSValuePair;
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}
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nsCSSRect* GetCSSRectValue() const {
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NS_ASSERTION(IsCSSRectUnit(mUnit), "unit mismatch");
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return mValue.mCSSRect;
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}
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nsCSSValueList* GetCSSValueListValue() const {
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NS_ASSERTION(IsCSSValueListUnit(mUnit), "unit mismatch");
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return mValue.mCSSValueList;
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}
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nsCSSValuePairList* GetCSSValuePairListValue() const {
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NS_ASSERTION(IsCSSValuePairListUnit(mUnit), "unit mismatch");
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return mValue.mCSSValuePairList;
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}
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const PRUnichar* GetStringBufferValue() const {
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NS_ASSERTION(IsStringUnit(mUnit), "unit mismatch");
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return GetBufferValue(mValue.mString);
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}
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void GetStringValue(nsAString& aBuffer) const {
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NS_ASSERTION(IsStringUnit(mUnit), "unit mismatch");
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aBuffer.Truncate();
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PRUint32 len = NS_strlen(GetBufferValue(mValue.mString));
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mValue.mString->ToString(len, aBuffer);
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}
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explicit Value(Unit aUnit = eUnit_Null) : mUnit(aUnit) {
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NS_ASSERTION(aUnit == eUnit_Null || aUnit == eUnit_Normal ||
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aUnit == eUnit_Auto || aUnit == eUnit_None,
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"must be valueless unit");
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}
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Value(const Value& aOther) : mUnit(eUnit_Null) { *this = aOther; }
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enum IntegerConstructorType { IntegerConstructor };
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Value(PRInt32 aInt, Unit aUnit, IntegerConstructorType);
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enum CoordConstructorType { CoordConstructor };
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Value(nscoord aLength, CoordConstructorType);
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enum PercentConstructorType { PercentConstructor };
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Value(float aPercent, PercentConstructorType);
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enum FloatConstructorType { FloatConstructor };
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Value(float aFloat, FloatConstructorType);
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enum ColorConstructorType { ColorConstructor };
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Value(nscolor aColor, ColorConstructorType);
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~Value() { FreeValue(); }
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void SetNormalValue();
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void SetAutoValue();
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void SetNoneValue();
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void SetIntValue(PRInt32 aInt, Unit aUnit);
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void SetCoordValue(nscoord aCoord);
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void SetPercentValue(float aPercent);
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void SetFloatValue(float aFloat);
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void SetColorValue(nscolor aColor);
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void SetUnparsedStringValue(const nsString& aString);
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// These setters take ownership of |aValue|, and are therefore named
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// "SetAndAdopt*".
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void SetAndAdoptCSSValueValue(nsCSSValue *aValue, Unit aUnit);
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void SetAndAdoptCSSValuePairValue(nsCSSValuePair *aValue, Unit aUnit);
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void SetAndAdoptCSSRectValue(nsCSSRect *aValue, Unit aUnit);
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void SetAndAdoptCSSValueListValue(nsCSSValueList *aValue, Unit aUnit);
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void SetAndAdoptCSSValuePairListValue(nsCSSValuePairList *aValue);
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Value& operator=(const Value& aOther);
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PRBool operator==(const Value& aOther) const;
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PRBool operator!=(const Value& aOther) const
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{ return !(*this == aOther); }
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private:
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void FreeValue();
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static const PRUnichar* GetBufferValue(nsStringBuffer* aBuffer) {
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return static_cast<PRUnichar*>(aBuffer->Data());
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}
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static PRBool IsIntUnit(Unit aUnit) {
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return aUnit == eUnit_Enumerated || aUnit == eUnit_Visibility ||
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aUnit == eUnit_Integer;
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}
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static PRBool IsCSSValueUnit(Unit aUnit) {
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return aUnit == eUnit_Calc;
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}
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static PRBool IsCSSValuePairUnit(Unit aUnit) {
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return aUnit == eUnit_CSSValuePair;
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}
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static PRBool IsCSSRectUnit(Unit aUnit) {
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return aUnit == eUnit_CSSRect;
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}
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static PRBool IsCSSValueListUnit(Unit aUnit) {
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return aUnit == eUnit_Dasharray || aUnit == eUnit_Shadow ||
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aUnit == eUnit_Transform;
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}
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static PRBool IsCSSValuePairListUnit(Unit aUnit) {
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return aUnit == eUnit_CSSValuePairList;
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}
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static PRBool IsStringUnit(Unit aUnit) {
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return aUnit == eUnit_UnparsedString;
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}
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};
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};
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#endif
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