gecko-dev/layout/style/nsStyleUtil.h

124 lines
4.9 KiB
C++

/* -*- 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 mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* 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 ***** */
#ifndef nsStyleUtil_h___
#define nsStyleUtil_h___
#include "nsCoord.h"
#include "nsCSSProperty.h"
class nsPresContext;
struct nsStyleBackground;
class nsString;
class nsStringComparator;
class nsIContent;
enum nsFontSizeType {
eFontSize_HTML = 1,
eFontSize_CSS = 2
};
// Style utility functions
class nsStyleUtil {
public:
static float GetScalingFactor(PRInt32 aScaler);
static nscoord CalcFontPointSize(PRInt32 aHTMLSize, PRInt32 aBasePointSize,
float aScalingFactor, nsPresContext* aPresContext,
nsFontSizeType aFontSizeType = eFontSize_HTML);
static nscoord FindNextSmallerFontSize(nscoord aFontSize, PRInt32 aBasePointSize,
float aScalingFactor, nsPresContext* aPresContext,
nsFontSizeType aFontSizeType = eFontSize_HTML);
static nscoord FindNextLargerFontSize(nscoord aFontSize, PRInt32 aBasePointSize,
float aScalingFactor, nsPresContext* aPresContext,
nsFontSizeType aFontSizeType = eFontSize_HTML);
static PRInt32 ConstrainFontWeight(PRInt32 aWeight);
static PRBool DashMatchCompare(const nsAString& aAttributeValue,
const nsAString& aSelectorValue,
const nsStringComparator& aComparator);
// Append a quoted (with "") and escaped version of aString to aResult.
static void AppendEscapedCSSString(const nsString& aString,
nsAString& aResult);
// Append the identifier given by |aIdent| to |aResult|, with
// appropriate escaping so that it can be reparsed to the same
// identifier.
static void AppendEscapedCSSIdent(const nsString& aIdent,
nsAString& aResult);
// Append a bitmask-valued property's value(s) (space-separated) to aResult.
static void AppendBitmaskCSSValue(nsCSSProperty aProperty,
PRInt32 aMaskedValue,
PRInt32 aFirstMask,
PRInt32 aLastMask,
nsAString& aResult);
/*
* Convert an author-provided floating point number to an integer (0
* ... 255) appropriate for use in the alpha component of a color.
*/
static PRUint8 FloatToColorComponent(float aAlpha)
{
NS_ASSERTION(0.0 <= aAlpha && aAlpha <= 1.0, "out of range");
return NSToIntRound(aAlpha * 255);
}
/*
* Convert the alpha component of an nscolor (0 ... 255) to the
* floating point number with the least accurate *decimal*
* representation that is converted to that color.
*
* Should be used only by serialization code.
*/
static float ColorComponentToFloat(PRUint8 aAlpha);
/*
* Does this child count as significant for selector matching?
*/
static PRBool IsSignificantChild(nsIContent* aChild,
PRBool aTextIsSignificant,
PRBool aWhitespaceIsSignificant);
};
#endif /* nsStyleUtil_h___ */