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comparison: layout/style/nsStyleCoord.h

layout/style/nsStyleCoord.h

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1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
2 /* This Source Code Form is subject to the terms of the Mozilla Public
3 * License, v. 2.0. If a copy of the MPL was not distributed with this
4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
5
6 /* representation of length values in computed style data */
7
8 #ifndef nsStyleCoord_h___
9 #define nsStyleCoord_h___
10
11 #include "nsCoord.h"
12 #include "nsStyleConsts.h"
13
14 enum nsStyleUnit {
15 eStyleUnit_Null = 0, // (no value) value is not specified
16 eStyleUnit_Normal = 1, // (no value)
17 eStyleUnit_Auto = 2, // (no value)
18 eStyleUnit_None = 3, // (no value)
19 eStyleUnit_Percent = 10, // (float) 1.0 == 100%
20 eStyleUnit_Factor = 11, // (float) a multiplier
21 eStyleUnit_Degree = 12, // (float) angle in degrees
22 eStyleUnit_Grad = 13, // (float) angle in grads
23 eStyleUnit_Radian = 14, // (float) angle in radians
24 eStyleUnit_Turn = 15, // (float) angle in turns
25 eStyleUnit_FlexFraction = 16, // (float) <flex> in fr units
26 eStyleUnit_Coord = 20, // (nscoord) value is twips
27 eStyleUnit_Integer = 30, // (int) value is simple integer
28 eStyleUnit_Enumerated = 32, // (int) value has enumerated meaning
29
30 // The following are allocated types. They are weak pointers to
31 // values allocated by nsStyleContext::Alloc.
32 eStyleUnit_Calc = 40 // (Calc*) calc() toplevel; always present
33 // to distinguish 50% from calc(50%), etc.
34 };
35
36 typedef union {
37 int32_t mInt; // nscoord is a int32_t for now
38 float mFloat;
39 // An mPointer is a weak pointer to a value that is guaranteed to
40 // outlive the nsStyleCoord. In the case of nsStyleCoord::Calc*, it
41 // is a pointer owned by the style context, allocated through
42 // nsStyleContext::Alloc (and, therefore, is never stored in the rule
43 // tree).
44 void* mPointer;
45 } nsStyleUnion;
46
47 /**
48 * Class that hold a single size specification used by the style
49 * system. The size specification consists of two parts -- a number
50 * and a unit. The number is an integer, a floating point value, an
51 * nscoord, or undefined, and the unit is an nsStyleUnit. Checking
52 * the unit is a must before asking for the value in any particular
53 * form.
54 */
55 class nsStyleCoord {
56 public:
57 struct Calc {
58 // Every calc() expression evaluates to a length plus a percentage.
59 nscoord mLength;
60 float mPercent;
61 bool mHasPercent; // whether there was any % syntax, even if 0
62
63 bool operator==(const Calc& aOther) const {
64 return mLength == aOther.mLength &&
65 mPercent == aOther.mPercent &&
66 mHasPercent == aOther.mHasPercent;
67 }
68 bool operator!=(const Calc& aOther) const { return !(*this == aOther); }
69 };
70
71 nsStyleCoord(nsStyleUnit aUnit = eStyleUnit_Null);
72 enum CoordConstructorType { CoordConstructor };
73 inline nsStyleCoord(nscoord aValue, CoordConstructorType);
74 nsStyleCoord(int32_t aValue, nsStyleUnit aUnit);
75 nsStyleCoord(float aValue, nsStyleUnit aUnit);
76 inline nsStyleCoord(const nsStyleCoord& aCopy);
77 inline nsStyleCoord(const nsStyleUnion& aValue, nsStyleUnit aUnit);
78
79 nsStyleCoord& operator=(const nsStyleCoord& aOther)
80 {
81 mUnit = aOther.mUnit;
82 mValue = aOther.mValue;
83 return *this;
84 }
85 bool operator==(const nsStyleCoord& aOther) const;
86 bool operator!=(const nsStyleCoord& aOther) const;
87
88 nsStyleUnit GetUnit() const {
89 NS_ASSERTION(mUnit != eStyleUnit_Null, "reading uninitialized value");
90 return mUnit;
91 }
92
93 bool IsAngleValue() const {
94 return eStyleUnit_Degree <= mUnit && mUnit <= eStyleUnit_Turn;
95 }
96
97 bool IsCalcUnit() const {
98 return eStyleUnit_Calc == mUnit;
99 }
100
101 bool IsPointerValue() const {
102 return IsCalcUnit();
103 }
104
105 bool IsCoordPercentCalcUnit() const {
106 return mUnit == eStyleUnit_Coord ||
107 mUnit == eStyleUnit_Percent ||
108 IsCalcUnit();
109 }
110
111 // Does this calc() expression have any percentages inside it? Can be
112 // called only when IsCalcUnit() is true.
113 bool CalcHasPercent() const {
114 return GetCalcValue()->mHasPercent;
115 }
116
117 bool HasPercent() const {
118 return mUnit == eStyleUnit_Percent ||
119 (IsCalcUnit() && CalcHasPercent());
120 }
121
122 bool ConvertsToLength() const {
123 return mUnit == eStyleUnit_Coord ||
124 (IsCalcUnit() && !CalcHasPercent());
125 }
126
127 nscoord GetCoordValue() const;
128 int32_t GetIntValue() const;
129 float GetPercentValue() const;
130 float GetFactorValue() const;
131 float GetAngleValue() const;
132 double GetAngleValueInRadians() const;
133 float GetFlexFractionValue() const;
134 Calc* GetCalcValue() const;
135 void GetUnionValue(nsStyleUnion& aValue) const;
136 uint32_t HashValue(uint32_t aHash) const;
137
138 void Reset(); // sets to null
139 void SetCoordValue(nscoord aValue);
140 void SetIntValue(int32_t aValue, nsStyleUnit aUnit);
141 void SetPercentValue(float aValue);
142 void SetFactorValue(float aValue);
143 void SetAngleValue(float aValue, nsStyleUnit aUnit);
144 void SetFlexFractionValue(float aValue);
145 void SetNormalValue();
146 void SetAutoValue();
147 void SetNoneValue();
148 void SetCalcValue(Calc* aValue);
149
150 private:
151 nsStyleUnit mUnit;
152 nsStyleUnion mValue;
153 };
154
155 /**
156 * Class that represents a set of top/right/bottom/left nsStyleCoords.
157 * This is commonly used to hold the widths of the borders, margins,
158 * or paddings of a box.
159 */
160 class nsStyleSides {
161 public:
162 nsStyleSides();
163
164 // nsStyleSides& operator=(const nsStyleSides& aCopy); // use compiler's version
165 bool operator==(const nsStyleSides& aOther) const;
166 bool operator!=(const nsStyleSides& aOther) const;
167
168 inline nsStyleUnit GetUnit(mozilla::css::Side aSide) const;
169 inline nsStyleUnit GetLeftUnit() const;
170 inline nsStyleUnit GetTopUnit() const;
171 inline nsStyleUnit GetRightUnit() const;
172 inline nsStyleUnit GetBottomUnit() const;
173
174 inline nsStyleCoord Get(mozilla::css::Side aSide) const;
175 inline nsStyleCoord GetLeft() const;
176 inline nsStyleCoord GetTop() const;
177 inline nsStyleCoord GetRight() const;
178 inline nsStyleCoord GetBottom() const;
179
180 void Reset();
181
182 inline void Set(mozilla::css::Side aSide, const nsStyleCoord& aCoord);
183 inline void SetLeft(const nsStyleCoord& aCoord);
184 inline void SetTop(const nsStyleCoord& aCoord);
185 inline void SetRight(const nsStyleCoord& aCoord);
186 inline void SetBottom(const nsStyleCoord& aCoord);
187
188 protected:
189 uint8_t mUnits[4];
190 nsStyleUnion mValues[4];
191 };
192
193 /**
194 * Class that represents a set of top-left/top-right/bottom-left/bottom-right
195 * nsStyleCoord pairs. This is used to hold the dimensions of the
196 * corners of a box (for, e.g., border-radius and outline-radius).
197 */
198 class nsStyleCorners {
199 public:
200 nsStyleCorners();
201
202 // use compiler's version
203 //nsStyleCorners& operator=(const nsStyleCorners& aCopy);
204 bool operator==(const nsStyleCorners& aOther) const;
205 bool operator!=(const nsStyleCorners& aOther) const;
206
207 // aCorner is always one of NS_CORNER_* defined in nsStyleConsts.h
208 inline nsStyleUnit GetUnit(uint8_t aHalfCorner) const;
209
210 inline nsStyleCoord Get(uint8_t aHalfCorner) const;
211
212 void Reset();
213
214 inline void Set(uint8_t aHalfCorner, const nsStyleCoord& aCoord);
215
216 protected:
217 uint8_t mUnits[8];
218 nsStyleUnion mValues[8];
219 };
220
221
222 // -------------------------
223 // nsStyleCoord inlines
224 //
225 inline nsStyleCoord::nsStyleCoord(nscoord aValue, CoordConstructorType)
226 : mUnit(eStyleUnit_Coord)
227 {
228 mValue.mInt = aValue;
229 }
230
231 // FIXME: In C++0x we can rely on the default copy constructor since
232 // default copy construction is defined properly for unions. But when
233 // can we actually use that? (It seems to work in gcc 4.4.)
234 inline nsStyleCoord::nsStyleCoord(const nsStyleCoord& aCopy)
235 : mUnit(aCopy.mUnit)
236 {
237 if ((eStyleUnit_Percent <= mUnit) && (mUnit < eStyleUnit_Coord)) {
238 mValue.mFloat = aCopy.mValue.mFloat;
239 }
240 else if (IsPointerValue()) {
241 mValue.mPointer = aCopy.mValue.mPointer;
242 }
243 else {
244 mValue.mInt = aCopy.mValue.mInt;
245 }
246 }
247
248 inline nsStyleCoord::nsStyleCoord(const nsStyleUnion& aValue, nsStyleUnit aUnit)
249 : mUnit(aUnit), mValue(aValue)
250 {
251 }
252
253 inline bool nsStyleCoord::operator!=(const nsStyleCoord& aOther) const
254 {
255 return !((*this) == aOther);
256 }
257
258 inline nscoord nsStyleCoord::GetCoordValue() const
259 {
260 NS_ASSERTION((mUnit == eStyleUnit_Coord), "not a coord value");
261 if (mUnit == eStyleUnit_Coord) {
262 return mValue.mInt;
263 }
264 return 0;
265 }
266
267 inline int32_t nsStyleCoord::GetIntValue() const
268 {
269 NS_ASSERTION((mUnit == eStyleUnit_Enumerated) ||
270 (mUnit == eStyleUnit_Integer), "not an int value");
271 if ((mUnit == eStyleUnit_Enumerated) ||
272 (mUnit == eStyleUnit_Integer)) {
273 return mValue.mInt;
274 }
275 return 0;
276 }
277
278 inline float nsStyleCoord::GetPercentValue() const
279 {
280 NS_ASSERTION(mUnit == eStyleUnit_Percent, "not a percent value");
281 if (mUnit == eStyleUnit_Percent) {
282 return mValue.mFloat;
283 }
284 return 0.0f;
285 }
286
287 inline float nsStyleCoord::GetFactorValue() const
288 {
289 NS_ASSERTION(mUnit == eStyleUnit_Factor, "not a factor value");
290 if (mUnit == eStyleUnit_Factor) {
291 return mValue.mFloat;
292 }
293 return 0.0f;
294 }
295
296 inline float nsStyleCoord::GetAngleValue() const
297 {
298 NS_ASSERTION(mUnit >= eStyleUnit_Degree &&
299 mUnit <= eStyleUnit_Turn, "not an angle value");
300 if (mUnit >= eStyleUnit_Degree && mUnit <= eStyleUnit_Turn) {
301 return mValue.mFloat;
302 }
303 return 0.0f;
304 }
305
306 inline float nsStyleCoord::GetFlexFractionValue() const
307 {
308 NS_ASSERTION(mUnit == eStyleUnit_FlexFraction, "not a fr value");
309 if (mUnit == eStyleUnit_FlexFraction) {
310 return mValue.mFloat;
311 }
312 return 0.0f;
313 }
314
315 inline nsStyleCoord::Calc* nsStyleCoord::GetCalcValue() const
316 {
317 NS_ASSERTION(IsCalcUnit(), "not a pointer value");
318 if (IsCalcUnit()) {
319 return static_cast<Calc*>(mValue.mPointer);
320 }
321 return nullptr;
322 }
323
324
325 inline void nsStyleCoord::GetUnionValue(nsStyleUnion& aValue) const
326 {
327 aValue = mValue;
328 }
329
330 // -------------------------
331 // nsStyleSides inlines
332 //
333 inline bool nsStyleSides::operator!=(const nsStyleSides& aOther) const
334 {
335 return !((*this) == aOther);
336 }
337
338 inline nsStyleUnit nsStyleSides::GetUnit(mozilla::css::Side aSide) const
339 {
340 return (nsStyleUnit)mUnits[aSide];
341 }
342
343 inline nsStyleUnit nsStyleSides::GetLeftUnit() const
344 {
345 return GetUnit(NS_SIDE_LEFT);
346 }
347
348 inline nsStyleUnit nsStyleSides::GetTopUnit() const
349 {
350 return GetUnit(NS_SIDE_TOP);
351 }
352
353 inline nsStyleUnit nsStyleSides::GetRightUnit() const
354 {
355 return GetUnit(NS_SIDE_RIGHT);
356 }
357
358 inline nsStyleUnit nsStyleSides::GetBottomUnit() const
359 {
360 return GetUnit(NS_SIDE_BOTTOM);
361 }
362
363 inline nsStyleCoord nsStyleSides::Get(mozilla::css::Side aSide) const
364 {
365 return nsStyleCoord(mValues[aSide], nsStyleUnit(mUnits[aSide]));
366 }
367
368 inline nsStyleCoord nsStyleSides::GetLeft() const
369 {
370 return Get(NS_SIDE_LEFT);
371 }
372
373 inline nsStyleCoord nsStyleSides::GetTop() const
374 {
375 return Get(NS_SIDE_TOP);
376 }
377
378 inline nsStyleCoord nsStyleSides::GetRight() const
379 {
380 return Get(NS_SIDE_RIGHT);
381 }
382
383 inline nsStyleCoord nsStyleSides::GetBottom() const
384 {
385 return Get(NS_SIDE_BOTTOM);
386 }
387
388 inline void nsStyleSides::Set(mozilla::css::Side aSide, const nsStyleCoord& aCoord)
389 {
390 mUnits[aSide] = aCoord.GetUnit();
391 aCoord.GetUnionValue(mValues[aSide]);
392 }
393
394 inline void nsStyleSides::SetLeft(const nsStyleCoord& aCoord)
395 {
396 Set(NS_SIDE_LEFT, aCoord);
397 }
398
399 inline void nsStyleSides::SetTop(const nsStyleCoord& aCoord)
400 {
401 Set(NS_SIDE_TOP, aCoord);
402 }
403
404 inline void nsStyleSides::SetRight(const nsStyleCoord& aCoord)
405 {
406 Set(NS_SIDE_RIGHT, aCoord);
407 }
408
409 inline void nsStyleSides::SetBottom(const nsStyleCoord& aCoord)
410 {
411 Set(NS_SIDE_BOTTOM, aCoord);
412 }
413
414 // -------------------------
415 // nsStyleCorners inlines
416 //
417 inline bool nsStyleCorners::operator!=(const nsStyleCorners& aOther) const
418 {
419 return !((*this) == aOther);
420 }
421
422 inline nsStyleUnit nsStyleCorners::GetUnit(uint8_t aCorner) const
423 {
424 return (nsStyleUnit)mUnits[aCorner];
425 }
426
427 inline nsStyleCoord nsStyleCorners::Get(uint8_t aCorner) const
428 {
429 return nsStyleCoord(mValues[aCorner], nsStyleUnit(mUnits[aCorner]));
430 }
431
432 inline void nsStyleCorners::Set(uint8_t aCorner, const nsStyleCoord& aCoord)
433 {
434 mUnits[aCorner] = aCoord.GetUnit();
435 aCoord.GetUnionValue(mValues[aCorner]);
436 }
437
438 #endif /* nsStyleCoord_h___ */

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