mirror of
https://github.com/mozilla/gecko-dev.git
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292 lines
9.5 KiB
C++
292 lines
9.5 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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* Contributor(s):
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*/
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#ifndef nsCSSValue_h___
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#define nsCSSValue_h___
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#include "nslayout.h"
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#include "nsColor.h"
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#include "nsString.h"
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#include "nsCoord.h"
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#include "nsCSSProps.h"
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#include "nsUnitConversion.h"
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enum nsCSSUnit {
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eCSSUnit_Null = 0, // (n/a) null unit, value is not specified
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eCSSUnit_Auto = 1, // (n/a) value is algorithmic
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eCSSUnit_Inherit = 2, // (n/a) value is inherited
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eCSSUnit_Initial = 3, // (n/a) value is default UA value
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eCSSUnit_None = 4, // (n/a) value is none
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eCSSUnit_Normal = 5, // (n/a) value is normal (algorithmic, different than auto)
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eCSSUnit_String = 10, // (nsString) a string value
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eCSSUnit_URL = 11, // (nsString) a URL value
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eCSSUnit_Attr = 12, // (nsString) a attr(string) value
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eCSSUnit_Counter = 13, // (nsString) a counter(string,[string]) value
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eCSSUnit_Counters = 14, // (nsString) a counters(string,string[,string]) value
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eCSSUnit_Integer = 50, // (int) simple value
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eCSSUnit_Enumerated = 51, // (int) value has enumerated meaning
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eCSSUnit_Color = 80, // (color) an RGBA value
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eCSSUnit_Percent = 90, // (float) 1.0 == 100%) value is percentage of something
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eCSSUnit_Number = 91, // (float) value is numeric (usually multiplier, different behavior that percent)
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// Length units - fixed
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// US English
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eCSSUnit_Inch = 100, // (float) Standard length
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eCSSUnit_Foot = 101, // (float) 12 inches
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eCSSUnit_Mile = 102, // (float) 5280 feet
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// Metric
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eCSSUnit_Millimeter = 207, // (float) 1/1000 meter
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eCSSUnit_Centimeter = 208, // (float) 1/100 meter
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eCSSUnit_Meter = 210, // (float) Standard length
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eCSSUnit_Kilometer = 213, // (float) 1000 meters
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// US Typographic
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eCSSUnit_Point = 300, // (float) 1/72 inch
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eCSSUnit_Pica = 301, // (float) 12 points == 1/6 inch
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// European Typographic
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eCSSUnit_Didot = 400, // (float) 15 didots == 16 points
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eCSSUnit_Cicero = 401, // (float) 12 didots
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// Length units - relative
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// Font relative measure
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eCSSUnit_EM = 800, // (float) == current font size
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eCSSUnit_EN = 801, // (float) .5 em
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eCSSUnit_XHeight = 802, // (float) distance from top of lower case x to baseline
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eCSSUnit_CapHeight = 803, // (float) distance from top of uppercase case H to baseline
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eCSSUnit_Char = 804, // (float) number of characters, used for width with monospace font
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// Screen relative measure
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eCSSUnit_Pixel = 900, // (float)
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// Proportional Unit (for columns in tables)
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eCSSUnit_Proportional = 950,
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// Angular units
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eCSSUnit_Degree = 1000, // (float) 360 per circle
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eCSSUnit_Grad = 1001, // (float) 400 per circle
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eCSSUnit_Radian = 1002, // (float) 2pi per circle
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// Frequency units
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eCSSUnit_Hertz = 2000, // (float)
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eCSSUnit_Kilohertz = 2001, // (float)
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// Time units
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eCSSUnit_Seconds = 3000, // (float)
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eCSSUnit_Milliseconds = 3001 // (float)
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};
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class nsCSSValue {
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public:
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// for valueless units only (null, auto, inherit, none, normal)
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nsCSSValue(nsCSSUnit aUnit = eCSSUnit_Null)
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: mUnit(aUnit)
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{
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NS_ASSERTION(aUnit <= eCSSUnit_Normal, "not a valueless unit");
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if (aUnit > eCSSUnit_Normal) {
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mUnit = eCSSUnit_Null;
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}
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mValue.mInt = 0;
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}
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nsCSSValue(PRInt32 aValue, nsCSSUnit aUnit);
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nsCSSValue(float aValue, nsCSSUnit aUnit);
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nsCSSValue(const nsAReadableString& aValue, nsCSSUnit aUnit);
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nsCSSValue(nscolor aValue);
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nsCSSValue(const nsCSSValue& aCopy);
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~nsCSSValue(void)
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{
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Reset();
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}
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nsCSSValue& operator=(const nsCSSValue& aCopy);
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PRBool operator==(const nsCSSValue& aOther) const;
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PRBool operator!=(const nsCSSValue& aOther) const;
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nsCSSUnit GetUnit(void) const { return mUnit; };
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PRBool IsLengthUnit(void) const
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{ return PRBool((eCSSUnit_Inch <= mUnit) && (mUnit <= eCSSUnit_Proportional)); }
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PRBool IsFixedLengthUnit(void) const
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{ return PRBool((eCSSUnit_Inch <= mUnit) && (mUnit <= eCSSUnit_Cicero)); }
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PRBool IsRelativeLengthUnit(void) const
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{ return PRBool((eCSSUnit_EM <= mUnit) && (mUnit <= eCSSUnit_Proportional)); }
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PRBool IsAngularUnit(void) const
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{ return PRBool((eCSSUnit_Degree <= mUnit) && (mUnit <= eCSSUnit_Radian)); }
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PRBool IsFrequencyUnit(void) const
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{ return PRBool((eCSSUnit_Hertz <= mUnit) && (mUnit <= eCSSUnit_Kilohertz)); }
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PRBool IsTimeUnit(void) const
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{ return PRBool((eCSSUnit_Seconds <= mUnit) && (mUnit <= eCSSUnit_Milliseconds)); }
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PRInt32 GetIntValue(void) const;
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float GetPercentValue(void) const;
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float GetFloatValue(void) const;
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nsAWritableString& GetStringValue(nsAWritableString& aBuffer) const;
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nscolor GetColorValue(void) const;
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nscoord GetLengthTwips(void) const
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{
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NS_ASSERTION(IsFixedLengthUnit(), "not a fixed length unit");
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if (IsFixedLengthUnit()) {
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switch (mUnit) {
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case eCSSUnit_Inch:
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return NS_INCHES_TO_TWIPS(mValue.mFloat);
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case eCSSUnit_Foot:
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return NS_FEET_TO_TWIPS(mValue.mFloat);
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case eCSSUnit_Mile:
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return NS_MILES_TO_TWIPS(mValue.mFloat);
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case eCSSUnit_Millimeter:
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return NS_MILLIMETERS_TO_TWIPS(mValue.mFloat);
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case eCSSUnit_Centimeter:
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return NS_CENTIMETERS_TO_TWIPS(mValue.mFloat);
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case eCSSUnit_Meter:
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return NS_METERS_TO_TWIPS(mValue.mFloat);
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case eCSSUnit_Kilometer:
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return NS_KILOMETERS_TO_TWIPS(mValue.mFloat);
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case eCSSUnit_Point:
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return NSFloatPointsToTwips(mValue.mFloat);
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case eCSSUnit_Pica:
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return NS_PICAS_TO_TWIPS(mValue.mFloat);
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case eCSSUnit_Didot:
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return NS_DIDOTS_TO_TWIPS(mValue.mFloat);
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case eCSSUnit_Cicero:
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return NS_CICEROS_TO_TWIPS(mValue.mFloat);
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default:
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NS_ERROR("should never get here");
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break;
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}
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}
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return 0;
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}
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void Reset(void) // sets to null
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{
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if ((eCSSUnit_String <= mUnit) && (mUnit <= eCSSUnit_Counters) &&
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(nsnull != mValue.mString)) {
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nsCRT::free(mValue.mString);
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}
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mUnit = eCSSUnit_Null;
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mValue.mInt = 0;
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}
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void SetIntValue(PRInt32 aValue, nsCSSUnit aUnit);
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void SetPercentValue(float aValue)
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{
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Reset();
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mUnit = eCSSUnit_Percent;
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mValue.mFloat = aValue;
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}
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void SetFloatValue(float aValue, nsCSSUnit aUnit)
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{
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NS_ASSERTION(eCSSUnit_Number <= aUnit, "not a float value");
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Reset();
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if (eCSSUnit_Number <= aUnit) {
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mUnit = aUnit;
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mValue.mFloat = aValue;
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}
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}
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void SetStringValue(const nsAReadableString& aValue, nsCSSUnit aUnit);
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void SetColorValue(nscolor aValue);
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void SetAutoValue(void);
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void SetInheritValue(void);
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void SetInitialValue(void);
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void SetNoneValue(void);
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void SetNormalValue(void);
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// debugging methods only
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void AppendToString(nsAWritableString& aBuffer, nsCSSProperty aPropID = eCSSProperty_UNKNOWN) const;
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void ToString(nsAWritableString& aBuffer, nsCSSProperty aPropID = eCSSProperty_UNKNOWN) const;
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protected:
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nsCSSUnit mUnit;
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union {
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PRInt32 mInt;
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float mFloat;
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PRUnichar* mString;
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nscolor mColor;
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} mValue;
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};
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inline PRInt32 nsCSSValue::GetIntValue(void) const
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{
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NS_ASSERTION((mUnit == eCSSUnit_Integer) ||
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(mUnit == eCSSUnit_Enumerated), "not an int value");
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if ((mUnit == eCSSUnit_Integer) ||
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(mUnit == eCSSUnit_Enumerated)) {
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return mValue.mInt;
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}
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return 0;
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}
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inline float nsCSSValue::GetPercentValue(void) const
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{
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NS_ASSERTION((mUnit == eCSSUnit_Percent), "not a percent value");
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if ((mUnit == eCSSUnit_Percent)) {
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return mValue.mFloat;
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}
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return 0.0f;
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}
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inline float nsCSSValue::GetFloatValue(void) const
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{
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NS_ASSERTION((eCSSUnit_Number <= mUnit), "not a float value");
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if ((mUnit >= eCSSUnit_Number)) {
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return mValue.mFloat;
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}
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return 0.0f;
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}
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inline nsAWritableString& nsCSSValue::GetStringValue(nsAWritableString& aBuffer) const
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{
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NS_ASSERTION((eCSSUnit_String <= mUnit) && (mUnit <= eCSSUnit_Counters), "not a string value");
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aBuffer.Truncate();
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if ((eCSSUnit_String <= mUnit) && (mUnit <= eCSSUnit_Counters) &&
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(nsnull != mValue.mString)) {
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aBuffer.Append(mValue.mString);
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}
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return aBuffer;
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}
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inline nscolor nsCSSValue::GetColorValue(void) const
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{
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NS_ASSERTION((mUnit == eCSSUnit_Color), "not a color value");
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if (mUnit == eCSSUnit_Color) {
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return mValue.mColor;
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}
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return NS_RGB(0,0,0);
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}
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inline PRBool nsCSSValue::operator!=(const nsCSSValue& aOther) const
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{
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return PRBool(! ((*this) == aOther));
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}
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#endif /* nsCSSValue_h___ */
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