gecko-dev/layout/style/nsStyleUtil.h

80 lines
2.8 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef nsStyleUtil_h___
#define nsStyleUtil_h___
#include "nsCoord.h"
#include "nsCSSProperty.h"
#include "gfxFontFeatures.h"
#include "nsTArray.h"
#include "nsCSSValue.h"
struct nsStyleBackground;
class nsString;
class nsStringComparator;
class nsIContent;
// Style utility functions
class nsStyleUtil {
public:
static bool 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);
static void AppendFontFeatureSettings(const nsTArray<gfxFontFeature>& aFeatures,
nsAString& aResult);
static void AppendFontFeatureSettings(const nsCSSValue& src,
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 bool IsSignificantChild(nsIContent* aChild,
bool aTextIsSignificant,
bool aWhitespaceIsSignificant);
};
#endif /* nsStyleUtil_h___ */