/* 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/. */
/* representation of simple property values within CSS declarations */
#ifndef nsCSSValue_h_
#define nsCSSValue_h_
#include "nsCoord.h"
struct RawServoCssUrlData;
namespace mozilla {
struct URLExtraData;
class CSSStyleSheet;
}
// namespace mozilla
// Forward declaration copied here since ServoBindings.h #includes nsCSSValue.h.
extern "C" {
mozilla::URLExtraData* Servo_CssUrlData_GetExtraData(
const RawServoCssUrlData*);
bool Servo_CssUrlData_IsLocalRef(
const RawServoCssUrlData* url);
}
enum nsCSSUnit : uint32_t {
eCSSUnit_Null =
0,
// (n/a) null unit, value is not specified
eCSSUnit_Percent =
100,
// (1.0 == 100%) value is percentage of
// something
eCSSUnit_Number =
101,
// value is numeric (usually multiplier,
// different behavior than percent)
// Font relative measure
eCSSUnit_EM =
800,
// == current font size (em)
eCSSUnit_XHeight =
801,
// distance from top of lower case x to
// baseline (ex)
eCSSUnit_Char =
802,
// number of characters, used for width with
// monospace font (ch)
eCSSUnit_RootEM =
803,
// == root element font size (rem)
eCSSUnit_Ideographic =
804,
// == CJK water ideograph width (ic)
eCSSUnit_CapHeight =
805,
// == Capital letter height (cap)
eCSSUnit_LineHeight =
806,
// == Line height (lh)
eCSSUnit_RootLineHeight =
807,
// == Root line height (rlh)
eCSSUnit_RootXHeight =
808,
// == Root x-height (rex)
eCSSUnit_RootChar =
809,
// == Root advance measure (rch)
eCSSUnit_RootIdeographic =
810,
// == Root ideographic advance measure (ric)
eCSSUnit_RootCapHeight =
811,
// == Root capital letter height (rch)
// Screen relative measure
eCSSUnit_Point =
900,
// 4/3 of a CSS pixel
eCSSUnit_Inch =
901,
// 96 CSS pixels
eCSSUnit_Millimeter =
902,
// 96/25.4 CSS pixels
eCSSUnit_Centimeter =
903,
// 96/2.54 CSS pixels
eCSSUnit_Pica =
904,
// 12 points == 16 CSS pixls
eCSSUnit_Quarter =
905,
// 96/101.6 CSS pixels
eCSSUnit_Pixel =
906,
// CSS pixel unit
// Viewport percentage lengths
eCSSUnit_VW =
950,
eCSSUnit_VH =
951,
eCSSUnit_VMin =
952,
eCSSUnit_VMax =
953,
eCSSUnit_LastLength = eCSSUnit_VMax,
};
struct nsCSSValuePair;
struct nsCSSValuePair_heap;
struct nsCSSValueList;
struct nsCSSValueList_heap;
struct nsCSSValueSharedList;
struct nsCSSValuePairList;
struct nsCSSValuePairList_heap;
class nsCSSValue {
public:
explicit nsCSSValue() : mUnit(eCSSUnit_Null) {}
nsCSSValue(
float aValue, nsCSSUnit aUnit);
nsCSSValue(
const nsCSSValue& aCopy);
nsCSSValue(nsCSSValue&& aOther) : mUnit(aOther.mUnit), mValue(aOther.mValue) {
aOther.mUnit = eCSSUnit_Null;
}
nsCSSValue&
operator=(
const nsCSSValue& aCopy);
nsCSSValue&
operator=(nsCSSValue&& aCopy);
bool operator==(
const nsCSSValue& aOther)
const;
bool operator!=(
const nsCSSValue&)
const =
default;
nsCSSUnit GetUnit()
const {
return mUnit; }
bool IsLengthUnit()
const {
return eCSSUnit_EM <= mUnit && mUnit <= eCSSUnit_LastLength;
}
/**
* A "pixel" length unit is a some multiple of CSS pixels.
*/
static bool IsPixelLengthUnit(nsCSSUnit aUnit) {
return eCSSUnit_Point <= aUnit && aUnit <= eCSSUnit_Pixel;
}
bool IsPixelLengthUnit()
const {
return IsPixelLengthUnit(mUnit); }
static bool IsPercentLengthUnit(nsCSSUnit aUnit) {
return aUnit == eCSSUnit_Percent;
}
static bool IsFloatUnit(nsCSSUnit aUnit) {
return eCSSUnit_Number <= aUnit; }
float GetPercentValue()
const {
MOZ_ASSERT(mUnit == eCSSUnit_Percent,
"not a percent value");
return mValue;
}
float GetFloatValue()
const {
MOZ_ASSERT(eCSSUnit_Number <= mUnit,
"not a float value");
MOZ_ASSERT(!std::isnan(mValue));
return mValue;
}
nscoord GetPixelLength()
const;
void Reset() { mUnit = eCSSUnit_Null; }
~nsCSSValue() { Reset(); }
public:
void SetPercentValue(
float aValue);
void SetFloatValue(
float aValue, nsCSSUnit aUnit);
protected:
nsCSSUnit mUnit;
float mValue;
};
#endif /* nsCSSValue_h_ */
