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gecko-dev/layout/style/nsCSSValue.h

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C++
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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: NPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Netscape 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/NPL/
*
* 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 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 NPL, 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 NPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifndef nsCSSValue_h___
#define nsCSSValue_h___
#include "nsColor.h"
#include "nsString.h"
#include "nsCRT.h"
#include "nsCoord.h"
#include "nsCSSProps.h"
#include "nsUnitConversion.h"
enum nsCSSUnit {
eCSSUnit_Null = 0, // (n/a) null unit, value is not specified
eCSSUnit_Auto = 1, // (n/a) value is algorithmic
eCSSUnit_Inherit = 2, // (n/a) value is inherited
eCSSUnit_Initial = 3, // (n/a) value is default UA value
eCSSUnit_None = 4, // (n/a) value is none
eCSSUnit_Normal = 5, // (n/a) value is normal (algorithmic, different than auto)
eCSSUnit_String = 10, // (nsString) a string value
eCSSUnit_URL = 11, // (nsString) a URL value
eCSSUnit_Attr = 12, // (nsString) a attr(string) value
eCSSUnit_Counter = 13, // (nsString) a counter(string,[string]) value
eCSSUnit_Counters = 14, // (nsString) a counters(string,string[,string]) value
eCSSUnit_Integer = 50, // (int) simple value
eCSSUnit_Enumerated = 51, // (int) value has enumerated meaning
eCSSUnit_Color = 80, // (color) an RGBA value
eCSSUnit_Percent = 90, // (float) 1.0 == 100%) value is percentage of something
eCSSUnit_Number = 91, // (float) value is numeric (usually multiplier, different behavior that percent)
// Length units - fixed
// US English
eCSSUnit_Inch = 100, // (float) Standard length
eCSSUnit_Foot = 101, // (float) 12 inches
eCSSUnit_Mile = 102, // (float) 5280 feet
// Metric
eCSSUnit_Millimeter = 207, // (float) 1/1000 meter
eCSSUnit_Centimeter = 208, // (float) 1/100 meter
eCSSUnit_Meter = 210, // (float) Standard length
eCSSUnit_Kilometer = 213, // (float) 1000 meters
// US Typographic
eCSSUnit_Point = 300, // (float) 1/72 inch
eCSSUnit_Pica = 301, // (float) 12 points == 1/6 inch
// European Typographic
eCSSUnit_Didot = 400, // (float) 15 didots == 16 points
eCSSUnit_Cicero = 401, // (float) 12 didots
// Length units - relative
// Font relative measure
eCSSUnit_EM = 800, // (float) == current font size
eCSSUnit_EN = 801, // (float) .5 em
eCSSUnit_XHeight = 802, // (float) distance from top of lower case x to baseline
eCSSUnit_CapHeight = 803, // (float) distance from top of uppercase case H to baseline
eCSSUnit_Char = 804, // (float) number of characters, used for width with monospace font
// Screen relative measure
eCSSUnit_Pixel = 900, // (float)
// Proportional Unit (for columns in tables)
eCSSUnit_Proportional = 950,
// Angular units
eCSSUnit_Degree = 1000, // (float) 360 per circle
eCSSUnit_Grad = 1001, // (float) 400 per circle
eCSSUnit_Radian = 1002, // (float) 2pi per circle
// Frequency units
eCSSUnit_Hertz = 2000, // (float)
eCSSUnit_Kilohertz = 2001, // (float)
// Time units
eCSSUnit_Seconds = 3000, // (float)
eCSSUnit_Milliseconds = 3001 // (float)
};
class nsCSSValue {
public:
// for valueless units only (null, auto, inherit, none, normal)
nsCSSValue(nsCSSUnit aUnit = eCSSUnit_Null)
: mUnit(aUnit)
{
NS_ASSERTION(aUnit <= eCSSUnit_Normal, "not a valueless unit");
if (aUnit > eCSSUnit_Normal) {
mUnit = eCSSUnit_Null;
}
mValue.mInt = 0;
}
nsCSSValue(PRInt32 aValue, nsCSSUnit aUnit);
nsCSSValue(float aValue, nsCSSUnit aUnit);
nsCSSValue(const nsAString& aValue, nsCSSUnit aUnit);
nsCSSValue(nscolor aValue);
nsCSSValue(const nsCSSValue& aCopy);
~nsCSSValue(void)
{
Reset();
}
nsCSSValue& operator=(const nsCSSValue& aCopy);
PRBool operator==(const nsCSSValue& aOther) const;
PRBool operator!=(const nsCSSValue& aOther) const;
nsCSSUnit GetUnit(void) const { return mUnit; };
PRBool IsLengthUnit(void) const
{ return PRBool((eCSSUnit_Inch <= mUnit) && (mUnit <= eCSSUnit_Proportional)); }
PRBool IsFixedLengthUnit(void) const
{ return PRBool((eCSSUnit_Inch <= mUnit) && (mUnit <= eCSSUnit_Cicero)); }
PRBool IsRelativeLengthUnit(void) const
{ return PRBool((eCSSUnit_EM <= mUnit) && (mUnit <= eCSSUnit_Proportional)); }
PRBool IsAngularUnit(void) const
{ return PRBool((eCSSUnit_Degree <= mUnit) && (mUnit <= eCSSUnit_Radian)); }
PRBool IsFrequencyUnit(void) const
{ return PRBool((eCSSUnit_Hertz <= mUnit) && (mUnit <= eCSSUnit_Kilohertz)); }
PRBool IsTimeUnit(void) const
{ return PRBool((eCSSUnit_Seconds <= mUnit) && (mUnit <= eCSSUnit_Milliseconds)); }
PRInt32 GetIntValue(void) const;
float GetPercentValue(void) const;
float GetFloatValue(void) const;
nsAString& GetStringValue(nsAString& aBuffer) const;
nscolor GetColorValue(void) const;
nscoord GetLengthTwips(void) const
{
NS_ASSERTION(IsFixedLengthUnit(), "not a fixed length unit");
if (IsFixedLengthUnit()) {
switch (mUnit) {
case eCSSUnit_Inch:
return NS_INCHES_TO_TWIPS(mValue.mFloat);
case eCSSUnit_Foot:
return NS_FEET_TO_TWIPS(mValue.mFloat);
case eCSSUnit_Mile:
return NS_MILES_TO_TWIPS(mValue.mFloat);
case eCSSUnit_Millimeter:
return NS_MILLIMETERS_TO_TWIPS(mValue.mFloat);
case eCSSUnit_Centimeter:
return NS_CENTIMETERS_TO_TWIPS(mValue.mFloat);
case eCSSUnit_Meter:
return NS_METERS_TO_TWIPS(mValue.mFloat);
case eCSSUnit_Kilometer:
return NS_KILOMETERS_TO_TWIPS(mValue.mFloat);
case eCSSUnit_Point:
return NSFloatPointsToTwips(mValue.mFloat);
case eCSSUnit_Pica:
return NS_PICAS_TO_TWIPS(mValue.mFloat);
case eCSSUnit_Didot:
return NS_DIDOTS_TO_TWIPS(mValue.mFloat);
case eCSSUnit_Cicero:
return NS_CICEROS_TO_TWIPS(mValue.mFloat);
default:
NS_ERROR("should never get here");
break;
}
}
return 0;
}
void Reset(void) // sets to null
{
if ((eCSSUnit_String <= mUnit) && (mUnit <= eCSSUnit_Counters) &&
(nsnull != mValue.mString)) {
nsCRT::free(mValue.mString);
}
mUnit = eCSSUnit_Null;
mValue.mInt = 0;
}
void SetIntValue(PRInt32 aValue, nsCSSUnit aUnit);
void SetPercentValue(float aValue)
{
Reset();
mUnit = eCSSUnit_Percent;
mValue.mFloat = aValue;
}
void SetFloatValue(float aValue, nsCSSUnit aUnit)
{
NS_ASSERTION(eCSSUnit_Number <= aUnit, "not a float value");
Reset();
if (eCSSUnit_Number <= aUnit) {
mUnit = aUnit;
mValue.mFloat = aValue;
}
}
void SetStringValue(const nsAString& aValue, nsCSSUnit aUnit);
void SetColorValue(nscolor aValue);
void SetAutoValue(void);
void SetInheritValue(void);
void SetInitialValue(void);
void SetNoneValue(void);
void SetNormalValue(void);
// debugging methods only
void AppendToString(nsAString& aBuffer, nsCSSProperty aPropID = eCSSProperty_UNKNOWN) const;
void ToString(nsAString& aBuffer, nsCSSProperty aPropID = eCSSProperty_UNKNOWN) const;
protected:
nsCSSUnit mUnit;
union {
PRInt32 mInt;
float mFloat;
PRUnichar* mString;
nscolor mColor;
} mValue;
};
inline PRInt32 nsCSSValue::GetIntValue(void) const
{
NS_ASSERTION((mUnit == eCSSUnit_Integer) ||
(mUnit == eCSSUnit_Enumerated), "not an int value");
if ((mUnit == eCSSUnit_Integer) ||
(mUnit == eCSSUnit_Enumerated)) {
return mValue.mInt;
}
return 0;
}
inline float nsCSSValue::GetPercentValue(void) const
{
NS_ASSERTION((mUnit == eCSSUnit_Percent), "not a percent value");
if ((mUnit == eCSSUnit_Percent)) {
return mValue.mFloat;
}
return 0.0f;
}
inline float nsCSSValue::GetFloatValue(void) const
{
NS_ASSERTION((eCSSUnit_Number <= mUnit), "not a float value");
if ((mUnit >= eCSSUnit_Number)) {
return mValue.mFloat;
}
return 0.0f;
}
inline nsAString& nsCSSValue::GetStringValue(nsAString& aBuffer) const
{
NS_ASSERTION((eCSSUnit_String <= mUnit) && (mUnit <= eCSSUnit_Counters), "not a string value");
aBuffer.Truncate();
if ((eCSSUnit_String <= mUnit) && (mUnit <= eCSSUnit_Counters) &&
(nsnull != mValue.mString)) {
aBuffer.Append(mValue.mString);
}
return aBuffer;
}
inline nscolor nsCSSValue::GetColorValue(void) const
{
NS_ASSERTION((mUnit == eCSSUnit_Color), "not a color value");
if (mUnit == eCSSUnit_Color) {
return mValue.mColor;
}
return NS_RGB(0,0,0);
}
inline PRBool nsCSSValue::operator!=(const nsCSSValue& aOther) const
{
return PRBool(! ((*this) == aOther));
}
#endif /* nsCSSValue_h___ */
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