gecko-dev/layout/style/nsCSSValue.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* The contents of this file are subject to the Netscape Public License
* Version 1.0 (the "NPL"); you may not use this file except in
* compliance with the NPL. You may obtain a copy of the NPL at
* http://www.mozilla.org/NPL/
*
* Software distributed under the NPL is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
* for the specific language governing rights and limitations under the
* NPL.
*
* The Initial Developer of this code under the NPL is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All Rights
* Reserved.
*/
#ifndef nsCSSValue_h___
#define nsCSSValue_h___
#include "nslayout.h"
#include "nsColor.h"
#include "nsString.h"
#include "nsCoord.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_None = 3, // (n/a) value is none
eCSSUnit_Normal = 4, // (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
// Screen relative measure
eCSSUnit_Pixel = 900, // (float)
// 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:
nsCSSValue(nsCSSUnit aUnit = eCSSUnit_Null); // for valueless units only (null, auto, inherit, none, normal)
nsCSSValue(PRInt32 aValue, nsCSSUnit aUnit);
nsCSSValue(float aValue, nsCSSUnit aUnit);
nsCSSValue(const nsString& aValue, nsCSSUnit aUnit);
nsCSSValue(nscolor aValue);
nsCSSValue(const nsCSSValue& aCopy);
~nsCSSValue(void);
nsCSSValue& operator=(const nsCSSValue& aCopy);
PRBool operator==(const nsCSSValue& aOther) const;
nsCSSUnit GetUnit(void) const { return mUnit; };
PRBool IsLengthUnit(void) const
{ return PRBool((eCSSUnit_Inch <= mUnit) && (mUnit <= eCSSUnit_Pixel)); }
PRBool IsFixedLengthUnit(void) const
{ return PRBool((eCSSUnit_Inch <= mUnit) && (mUnit <= eCSSUnit_Cicero)); }
PRBool IsRelativeLengthUnit(void) const
{ return PRBool((eCSSUnit_EM <= mUnit) && (mUnit <= eCSSUnit_Pixel)); }
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;
nsString& GetStringValue(nsString& aBuffer) const;
nscolor GetColorValue(void) const;
nscoord GetLengthTwips(void) const;
void Reset(void); // sets to null
void SetIntValue(PRInt32 aValue, nsCSSUnit aUnit);
void SetPercentValue(float aValue);
void SetFloatValue(float aValue, nsCSSUnit aUnit);
void SetStringValue(const nsString& aValue, nsCSSUnit aUnit);
void SetColorValue(nscolor aValue);
void SetAutoValue(void);
void SetInheritValue(void);
void SetNoneValue(void);
void SetNormalValue(void);
// debugging methods only
void AppendToString(nsString& aBuffer, PRInt32 aPropID = -1) const;
void ToString(nsString& aBuffer, PRInt32 aPropID = -1) const;
protected:
nsCSSUnit mUnit;
union {
PRInt32 mInt;
float mFloat;
nsString* 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 nsString& nsCSSValue::GetStringValue(nsString& 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);
}
#endif /* nsCSSValue_h___ */