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431 lines
12 KiB
C++
431 lines
12 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/* representation of length values in computed style data */
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#ifndef nsStyleCoord_h___
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#define nsStyleCoord_h___
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#include "nscore.h"
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#include "nsCoord.h"
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#include "nsCRT.h"
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#include "nsStyleConsts.h"
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class nsString;
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class nsStyleContext;
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enum nsStyleUnit {
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eStyleUnit_Null = 0, // (no value) value is not specified
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eStyleUnit_Normal = 1, // (no value)
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eStyleUnit_Auto = 2, // (no value)
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eStyleUnit_None = 3, // (no value)
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eStyleUnit_Percent = 10, // (float) 1.0 == 100%
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eStyleUnit_Factor = 11, // (float) a multiplier
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eStyleUnit_Degree = 12, // (float) angle in degrees
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eStyleUnit_Grad = 13, // (float) angle in grads
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eStyleUnit_Radian = 14, // (float) angle in radians
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eStyleUnit_Turn = 15, // (float) angle in turns
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eStyleUnit_Coord = 20, // (nscoord) value is twips
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eStyleUnit_Integer = 30, // (int) value is simple integer
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eStyleUnit_Enumerated = 32, // (int) value has enumerated meaning
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// The following are allocated types. They are weak pointers to
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// values allocated by nsStyleContext::Alloc.
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eStyleUnit_Calc = 40 // (Calc*) calc() toplevel; always present
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// to distinguish 50% from calc(50%), etc.
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};
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typedef union {
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int32_t mInt; // nscoord is a int32_t for now
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float mFloat;
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// An mPointer is a weak pointer to a value that is guaranteed to
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// outlive the nsStyleCoord. In the case of nsStyleCoord::Calc*, it
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// is a pointer owned by the style context, allocated through
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// nsStyleContext::Alloc (and, therefore, is never stored in the rule
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// tree).
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void* mPointer;
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} nsStyleUnion;
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/**
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* Class that hold a single size specification used by the style
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* system. The size specification consists of two parts -- a number
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* and a unit. The number is an integer, a floating point value, an
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* nscoord, or undefined, and the unit is an nsStyleUnit. Checking
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* the unit is a must before asking for the value in any particular
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* form.
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*/
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class nsStyleCoord {
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public:
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struct Calc {
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// Every calc() expression evaluates to a length plus a percentage.
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nscoord mLength;
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float mPercent;
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bool mHasPercent; // whether there was any % syntax, even if 0
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bool operator==(const Calc& aOther) const {
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return mLength == aOther.mLength &&
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mPercent == aOther.mPercent &&
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mHasPercent == aOther.mHasPercent;
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}
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bool operator!=(const Calc& aOther) const { return !(*this == aOther); }
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};
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nsStyleCoord(nsStyleUnit aUnit = eStyleUnit_Null);
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enum CoordConstructorType { CoordConstructor };
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inline nsStyleCoord(nscoord aValue, CoordConstructorType);
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nsStyleCoord(int32_t aValue, nsStyleUnit aUnit);
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nsStyleCoord(float aValue, nsStyleUnit aUnit);
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inline nsStyleCoord(const nsStyleCoord& aCopy);
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inline nsStyleCoord(const nsStyleUnion& aValue, nsStyleUnit aUnit);
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nsStyleCoord& operator=(const nsStyleCoord& aOther)
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{
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mUnit = aOther.mUnit;
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mValue = aOther.mValue;
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return *this;
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}
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bool operator==(const nsStyleCoord& aOther) const;
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bool operator!=(const nsStyleCoord& aOther) const;
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nsStyleUnit GetUnit() const {
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NS_ASSERTION(mUnit != eStyleUnit_Null, "reading uninitialized value");
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return mUnit;
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}
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bool IsAngleValue() const {
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return eStyleUnit_Degree <= mUnit && mUnit <= eStyleUnit_Turn;
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}
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bool IsCalcUnit() const {
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return eStyleUnit_Calc == mUnit;
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}
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bool IsPointerValue() const {
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return IsCalcUnit();
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}
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bool IsCoordPercentCalcUnit() const {
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return mUnit == eStyleUnit_Coord ||
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mUnit == eStyleUnit_Percent ||
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IsCalcUnit();
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}
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// Does this calc() expression have any percentages inside it? Can be
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// called only when IsCalcUnit() is true.
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bool CalcHasPercent() const {
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return GetCalcValue()->mHasPercent;
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}
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bool HasPercent() const {
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return mUnit == eStyleUnit_Percent ||
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(IsCalcUnit() && CalcHasPercent());
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}
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bool ConvertsToLength() const {
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return mUnit == eStyleUnit_Coord ||
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(IsCalcUnit() && !CalcHasPercent());
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}
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nscoord GetCoordValue() const;
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int32_t GetIntValue() const;
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float GetPercentValue() const;
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float GetFactorValue() const;
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float GetAngleValue() const;
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double GetAngleValueInRadians() const;
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Calc* GetCalcValue() const;
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void GetUnionValue(nsStyleUnion& aValue) const;
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uint32_t HashValue(uint32_t aHash) const;
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void Reset(); // sets to null
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void SetCoordValue(nscoord aValue);
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void SetIntValue(int32_t aValue, nsStyleUnit aUnit);
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void SetPercentValue(float aValue);
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void SetFactorValue(float aValue);
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void SetAngleValue(float aValue, nsStyleUnit aUnit);
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void SetNormalValue();
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void SetAutoValue();
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void SetNoneValue();
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void SetCalcValue(Calc* aValue);
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private:
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nsStyleUnit mUnit;
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nsStyleUnion mValue;
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};
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/**
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* Class that represents a set of top/right/bottom/left nsStyleCoords.
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* This is commonly used to hold the widths of the borders, margins,
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* or paddings of a box.
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*/
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class nsStyleSides {
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public:
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nsStyleSides();
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// nsStyleSides& operator=(const nsStyleSides& aCopy); // use compiler's version
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bool operator==(const nsStyleSides& aOther) const;
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bool operator!=(const nsStyleSides& aOther) const;
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inline nsStyleUnit GetUnit(mozilla::css::Side aSide) const;
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inline nsStyleUnit GetLeftUnit() const;
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inline nsStyleUnit GetTopUnit() const;
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inline nsStyleUnit GetRightUnit() const;
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inline nsStyleUnit GetBottomUnit() const;
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inline nsStyleCoord Get(mozilla::css::Side aSide) const;
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inline nsStyleCoord GetLeft() const;
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inline nsStyleCoord GetTop() const;
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inline nsStyleCoord GetRight() const;
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inline nsStyleCoord GetBottom() const;
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void Reset();
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inline void Set(mozilla::css::Side aSide, const nsStyleCoord& aCoord);
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inline void SetLeft(const nsStyleCoord& aCoord);
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inline void SetTop(const nsStyleCoord& aCoord);
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inline void SetRight(const nsStyleCoord& aCoord);
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inline void SetBottom(const nsStyleCoord& aCoord);
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protected:
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uint8_t mUnits[4];
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nsStyleUnion mValues[4];
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};
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/**
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* Class that represents a set of top-left/top-right/bottom-left/bottom-right
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* nsStyleCoord pairs. This is used to hold the dimensions of the
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* corners of a box (for, e.g., border-radius and outline-radius).
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*/
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class nsStyleCorners {
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public:
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nsStyleCorners();
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// use compiler's version
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//nsStyleCorners& operator=(const nsStyleCorners& aCopy);
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bool operator==(const nsStyleCorners& aOther) const;
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bool operator!=(const nsStyleCorners& aOther) const;
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// aCorner is always one of NS_CORNER_* defined in nsStyleConsts.h
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inline nsStyleUnit GetUnit(uint8_t aHalfCorner) const;
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inline nsStyleCoord Get(uint8_t aHalfCorner) const;
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void Reset();
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inline void Set(uint8_t aHalfCorner, const nsStyleCoord& aCoord);
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protected:
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uint8_t mUnits[8];
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nsStyleUnion mValues[8];
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};
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// -------------------------
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// nsStyleCoord inlines
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//
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inline nsStyleCoord::nsStyleCoord(nscoord aValue, CoordConstructorType)
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: mUnit(eStyleUnit_Coord)
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{
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mValue.mInt = aValue;
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}
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// FIXME: In C++0x we can rely on the default copy constructor since
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// default copy construction is defined properly for unions. But when
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// can we actually use that? (It seems to work in gcc 4.4.)
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inline nsStyleCoord::nsStyleCoord(const nsStyleCoord& aCopy)
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: mUnit(aCopy.mUnit)
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{
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if ((eStyleUnit_Percent <= mUnit) && (mUnit < eStyleUnit_Coord)) {
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mValue.mFloat = aCopy.mValue.mFloat;
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}
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else if (IsPointerValue()) {
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mValue.mPointer = aCopy.mValue.mPointer;
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}
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else {
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mValue.mInt = aCopy.mValue.mInt;
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}
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}
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inline nsStyleCoord::nsStyleCoord(const nsStyleUnion& aValue, nsStyleUnit aUnit)
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: mUnit(aUnit), mValue(aValue)
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{
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}
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inline bool nsStyleCoord::operator!=(const nsStyleCoord& aOther) const
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{
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return !((*this) == aOther);
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}
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inline nscoord nsStyleCoord::GetCoordValue() const
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{
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NS_ASSERTION((mUnit == eStyleUnit_Coord), "not a coord value");
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if (mUnit == eStyleUnit_Coord) {
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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 int32_t nsStyleCoord::GetIntValue() const
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{
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NS_ASSERTION((mUnit == eStyleUnit_Enumerated) ||
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(mUnit == eStyleUnit_Integer), "not an int value");
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if ((mUnit == eStyleUnit_Enumerated) ||
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(mUnit == eStyleUnit_Integer)) {
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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 nsStyleCoord::GetPercentValue() const
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{
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NS_ASSERTION(mUnit == eStyleUnit_Percent, "not a percent value");
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if (mUnit == eStyleUnit_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 nsStyleCoord::GetFactorValue() const
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{
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NS_ASSERTION(mUnit == eStyleUnit_Factor, "not a factor value");
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if (mUnit == eStyleUnit_Factor) {
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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 nsStyleCoord::GetAngleValue() const
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{
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NS_ASSERTION(mUnit >= eStyleUnit_Degree &&
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mUnit <= eStyleUnit_Turn, "not an angle value");
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if (mUnit >= eStyleUnit_Degree && mUnit <= eStyleUnit_Turn) {
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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 nsStyleCoord::Calc* nsStyleCoord::GetCalcValue() const
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{
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NS_ASSERTION(IsCalcUnit(), "not a pointer value");
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if (IsCalcUnit()) {
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return static_cast<Calc*>(mValue.mPointer);
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}
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return nullptr;
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}
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inline void nsStyleCoord::GetUnionValue(nsStyleUnion& aValue) const
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{
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aValue = mValue;
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}
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// -------------------------
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// nsStyleSides inlines
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//
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inline bool nsStyleSides::operator!=(const nsStyleSides& aOther) const
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{
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return !((*this) == aOther);
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}
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inline nsStyleUnit nsStyleSides::GetUnit(mozilla::css::Side aSide) const
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{
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return (nsStyleUnit)mUnits[aSide];
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}
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inline nsStyleUnit nsStyleSides::GetLeftUnit() const
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{
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return GetUnit(NS_SIDE_LEFT);
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}
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inline nsStyleUnit nsStyleSides::GetTopUnit() const
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{
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return GetUnit(NS_SIDE_TOP);
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}
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inline nsStyleUnit nsStyleSides::GetRightUnit() const
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{
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return GetUnit(NS_SIDE_RIGHT);
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}
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inline nsStyleUnit nsStyleSides::GetBottomUnit() const
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{
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return GetUnit(NS_SIDE_BOTTOM);
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}
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inline nsStyleCoord nsStyleSides::Get(mozilla::css::Side aSide) const
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{
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return nsStyleCoord(mValues[aSide], nsStyleUnit(mUnits[aSide]));
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}
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inline nsStyleCoord nsStyleSides::GetLeft() const
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{
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return Get(NS_SIDE_LEFT);
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}
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inline nsStyleCoord nsStyleSides::GetTop() const
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{
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return Get(NS_SIDE_TOP);
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}
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inline nsStyleCoord nsStyleSides::GetRight() const
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{
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return Get(NS_SIDE_RIGHT);
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}
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inline nsStyleCoord nsStyleSides::GetBottom() const
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{
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return Get(NS_SIDE_BOTTOM);
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}
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inline void nsStyleSides::Set(mozilla::css::Side aSide, const nsStyleCoord& aCoord)
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{
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mUnits[aSide] = aCoord.GetUnit();
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aCoord.GetUnionValue(mValues[aSide]);
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}
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inline void nsStyleSides::SetLeft(const nsStyleCoord& aCoord)
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{
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Set(NS_SIDE_LEFT, aCoord);
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}
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inline void nsStyleSides::SetTop(const nsStyleCoord& aCoord)
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{
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Set(NS_SIDE_TOP, aCoord);
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}
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inline void nsStyleSides::SetRight(const nsStyleCoord& aCoord)
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{
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Set(NS_SIDE_RIGHT, aCoord);
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}
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inline void nsStyleSides::SetBottom(const nsStyleCoord& aCoord)
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{
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Set(NS_SIDE_BOTTOM, aCoord);
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}
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// -------------------------
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// nsStyleCorners inlines
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//
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inline bool nsStyleCorners::operator!=(const nsStyleCorners& aOther) const
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{
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return !((*this) == aOther);
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}
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inline nsStyleUnit nsStyleCorners::GetUnit(uint8_t aCorner) const
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{
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return (nsStyleUnit)mUnits[aCorner];
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}
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inline nsStyleCoord nsStyleCorners::Get(uint8_t aCorner) const
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{
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return nsStyleCoord(mValues[aCorner], nsStyleUnit(mUnits[aCorner]));
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}
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inline void nsStyleCorners::Set(uint8_t aCorner, const nsStyleCoord& aCoord)
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{
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mUnits[aCorner] = aCoord.GetUnit();
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aCoord.GetUnionValue(mValues[aCorner]);
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}
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#endif /* nsStyleCoord_h___ */
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