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pjs/layout/style/nsCSSValue.h

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/* -*- 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 nsCSSValue_h___
#define nsCSSValue_h___
#include "nsColor.h"
#include "nsString.h"
#include "nsCRT.h"
#include "nsCoord.h"
#include "nsCSSProperty.h"
#include "nsUnitConversion.h"
#include "nsIURI.h"
#include "nsCOMPtr.h"
#include "nsAutoPtr.h"
class imgIRequest;
class nsIDocument;
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, // (PRUnichar*) a string value
eCSSUnit_Attr = 11, // (PRUnichar*) a attr(string) value
eCSSUnit_Counter = 12, // (PRUnichar*) a counter(string,[string]) value
eCSSUnit_Counters = 13, // (PRUnichar*) a counters(string,string[,string]) value
eCSSUnit_URL = 14, // (nsCSSValue::URL*) value
eCSSUnit_Image = 15, // (nsCSSValue::Image*) 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:
struct URL;
friend struct URL;
struct Image;
friend struct Image;
// 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) NS_HIDDEN;
nsCSSValue(float aValue, nsCSSUnit aUnit) NS_HIDDEN;
nsCSSValue(const nsAString& aValue, nsCSSUnit aUnit) NS_HIDDEN;
nsCSSValue(nscolor aValue) NS_HIDDEN;
nsCSSValue(URL* aValue) NS_HIDDEN;
nsCSSValue(Image* aValue) NS_HIDDEN;
nsCSSValue(const nsCSSValue& aCopy) NS_HIDDEN;
NS_FASTCALL ~nsCSSValue() NS_HIDDEN;
NS_HIDDEN_(nsCSSValue&) operator=(const nsCSSValue& aCopy);
NS_HIDDEN_(PRBool) operator==(const nsCSSValue& aOther) const;
PRBool operator!=(const nsCSSValue& aOther) const
{
return !(*this == aOther);
}
nsCSSUnit GetUnit() const { return mUnit; };
PRBool IsLengthUnit() const
{ return PRBool((eCSSUnit_Inch <= mUnit) && (mUnit <= eCSSUnit_Proportional)); }
PRBool IsFixedLengthUnit() const
{ return PRBool((eCSSUnit_Inch <= mUnit) && (mUnit <= eCSSUnit_Cicero)); }
PRBool IsRelativeLengthUnit() const
{ return PRBool((eCSSUnit_EM <= mUnit) && (mUnit <= eCSSUnit_Proportional)); }
PRBool IsAngularUnit() const
{ return PRBool((eCSSUnit_Degree <= mUnit) && (mUnit <= eCSSUnit_Radian)); }
PRBool IsFrequencyUnit() const
{ return PRBool((eCSSUnit_Hertz <= mUnit) && (mUnit <= eCSSUnit_Kilohertz)); }
PRBool IsTimeUnit() const
{ return PRBool((eCSSUnit_Seconds <= mUnit) && (mUnit <= eCSSUnit_Milliseconds)); }
PRInt32 GetIntValue() const
{
NS_ASSERTION(mUnit == eCSSUnit_Integer || mUnit == eCSSUnit_Enumerated,
"not an int value");
return mValue.mInt;
}
float GetPercentValue() const
{
NS_ASSERTION(mUnit == eCSSUnit_Percent, "not a percent value");
return mValue.mFloat;
}
float GetFloatValue() const
{
NS_ASSERTION(eCSSUnit_Number <= mUnit, "not a float value");
return mValue.mFloat;
}
nsAString& GetStringValue(nsAString& aBuffer) const
{
NS_ASSERTION(eCSSUnit_String <= mUnit && mUnit <= eCSSUnit_Counters,
"not a string value");
aBuffer.Truncate();
if (nsnull != mValue.mString) {
aBuffer.Append(mValue.mString);
}
return aBuffer;
}
const PRUnichar* GetStringBufferValue() const
{
NS_ASSERTION(eCSSUnit_String <= mUnit && mUnit <= eCSSUnit_Counters,
"not a string value");
return mValue.mString;
}
nscolor GetColorValue() const
{
NS_ASSERTION((mUnit == eCSSUnit_Color), "not a color value");
return mValue.mColor;
}
nsIURI* GetURLValue() const
{
NS_ASSERTION(mUnit == eCSSUnit_URL || mUnit == eCSSUnit_Image,
"not a URL value");
return mUnit == eCSSUnit_URL ?
mValue.mURL->mURI : mValue.mImage->mURI;
}
const PRUnichar* GetOriginalURLValue() const
{
NS_ASSERTION(mUnit == eCSSUnit_URL || mUnit == eCSSUnit_Image,
"not a URL value");
return mUnit == eCSSUnit_URL ?
mValue.mURL->mString : mValue.mImage->mString;
}
// Not making this inline because that would force us to include
// imgIRequest.h, which leads to REQUIRES hell, since this header is included
// all over.
NS_HIDDEN_(imgIRequest*) GetImageValue() const;
NS_HIDDEN_(nscoord) GetLengthTwips() const;
NS_HIDDEN_(void) Reset() // sets to null
{
if ((eCSSUnit_String <= mUnit) && (mUnit <= eCSSUnit_Counters) &&
(nsnull != mValue.mString)) {
nsCRT::free(mValue.mString);
} else if (eCSSUnit_URL == mUnit) {
mValue.mURL->Release();
} else if (eCSSUnit_Image == mUnit) {
mValue.mImage->Release();
}
mUnit = eCSSUnit_Null;
mValue.mInt = 0;
}
NS_HIDDEN_(void) SetIntValue(PRInt32 aValue, nsCSSUnit aUnit);
NS_HIDDEN_(void) SetPercentValue(float aValue);
NS_HIDDEN_(void) SetFloatValue(float aValue, nsCSSUnit aUnit);
NS_HIDDEN_(void) SetStringValue(const nsAString& aValue, nsCSSUnit aUnit);
NS_HIDDEN_(void) SetColorValue(nscolor aValue);
NS_HIDDEN_(void) SetURLValue(nsCSSValue::URL* aURI);
NS_HIDDEN_(void) SetImageValue(nsCSSValue::Image* aImage);
NS_HIDDEN_(void) SetAutoValue();
NS_HIDDEN_(void) SetInheritValue();
NS_HIDDEN_(void) SetInitialValue();
NS_HIDDEN_(void) SetNoneValue();
NS_HIDDEN_(void) SetNormalValue();
NS_HIDDEN_(void) StartImageLoad(nsIDocument* aDocument) const; // Not really const, but pretending
#ifdef DEBUG
NS_HIDDEN_(void)
AppendToString(nsAString& aBuffer,
nsCSSProperty aPropID = eCSSProperty_UNKNOWN) const;
NS_HIDDEN_(void)
ToString(nsAString& aBuffer,
nsCSSProperty aPropID = eCSSProperty_UNKNOWN) const;
#endif
MOZ_DECL_CTOR_COUNTER(nsCSSValue::URL)
struct URL {
// Caller must delete this object immediately if the allocation of
// |mString| fails.
URL(nsIURI* aURI, const PRUnichar* aString, nsIURI* aReferrer)
: mURI(aURI),
mString(nsCRT::strdup(aString)),
mReferrer(aReferrer),
mRefCnt(0)
{
MOZ_COUNT_CTOR(nsCSSValue::URL);
}
~URL()
{
// null |mString| isn't valid normally, but is checked by callers
// of the constructor
if (mString)
nsCRT::free(mString);
MOZ_COUNT_DTOR(nsCSSValue::URL);
}
PRBool operator==(const URL& aOther)
{
PRBool eq;
return nsCRT::strcmp(mString, aOther.mString) == 0 &&
(mURI == aOther.mURI || // handles null == null
(mURI && aOther.mURI &&
NS_SUCCEEDED(mURI->Equals(aOther.mURI, &eq)) &&
eq));
}
nsCOMPtr<nsIURI> mURI; // null == invalid URL
PRUnichar* mString;
nsCOMPtr<nsIURI> mReferrer;
void AddRef() { ++mRefCnt; }
void Release() { if (--mRefCnt == 0) delete this; }
protected:
nsrefcnt mRefCnt;
};
MOZ_DECL_CTOR_COUNTER(nsCSSValue::Image)
struct Image : public URL {
// Not making the constructor and destructor inline because that would
// force us to include imgIRequest.h, which leads to REQUIRES hell, since
// this header is included all over.
Image(nsIURI* aURI, const PRUnichar* aString, nsIURI* aReferrer,
nsIDocument* aDocument) NS_HIDDEN;
~Image() NS_HIDDEN;
// Inherit operator== from nsCSSValue::URL
nsCOMPtr<imgIRequest> mRequest; // null == image load blocked or somehow failed
// Override AddRef/Release so we delete ourselves via the right pointer.
void AddRef() { ++mRefCnt; }
void Release() { if (--mRefCnt == 0) delete this; }
};
protected:
nsCSSUnit mUnit;
union {
PRInt32 mInt;
float mFloat;
PRUnichar* mString;
nscolor mColor;
URL* mURL;
Image* mImage;
} mValue;
};
#endif /* nsCSSValue_h___ */
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