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comparison: gfx/2d/BaseMargin.h
gfx/2d/BaseMargin.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 #ifndef MOZILLA_GFX_BASEMARGIN_H_ | |
| 7 #define MOZILLA_GFX_BASEMARGIN_H_ | |
| 8 | |
| 9 #include "Types.h" | |
| 10 | |
| 11 namespace mozilla { | |
| 12 namespace gfx { | |
| 13 | |
| 14 /** | |
| 15 * Do not use this class directly. Subclass it, pass that subclass as the | |
| 16 * Sub parameter, and only use that subclass. | |
| 17 */ | |
| 18 template <class T, class Sub> | |
| 19 struct BaseMargin { | |
| 20 typedef mozilla::css::Side SideT; | |
| 21 | |
| 22 // Do not change the layout of these members; the Side() methods below | |
| 23 // depend on this order. | |
| 24 T top, right, bottom, left; | |
| 25 | |
| 26 // Constructors | |
| 27 BaseMargin() : top(0), right(0), bottom(0), left(0) {} | |
| 28 BaseMargin(T aTop, T aRight, T aBottom, T aLeft) : | |
| 29 top(aTop), right(aRight), bottom(aBottom), left(aLeft) {} | |
| 30 | |
| 31 void SizeTo(T aTop, T aRight, T aBottom, T aLeft) | |
| 32 { | |
| 33 top = aTop; right = aRight; bottom = aBottom; left = aLeft; | |
| 34 } | |
| 35 | |
| 36 T LeftRight() const { return left + right; } | |
| 37 T TopBottom() const { return top + bottom; } | |
| 38 | |
| 39 T& Side(SideT aSide) { | |
| 40 // This is ugly! | |
| 41 return *(&top + T(aSide)); | |
| 42 } | |
| 43 T Side(SideT aSide) const { | |
| 44 // This is ugly! | |
| 45 return *(&top + T(aSide)); | |
| 46 } | |
| 47 | |
| 48 // Overloaded operators. Note that '=' isn't defined so we'll get the | |
| 49 // compiler generated default assignment operator | |
| 50 bool operator==(const Sub& aMargin) const { | |
| 51 return top == aMargin.top && right == aMargin.right && | |
| 52 bottom == aMargin.bottom && left == aMargin.left; | |
| 53 } | |
| 54 bool operator!=(const Sub& aMargin) const { | |
| 55 return !(*this == aMargin); | |
| 56 } | |
| 57 Sub operator+(const Sub& aMargin) const { | |
| 58 return Sub(top + aMargin.top, right + aMargin.right, | |
| 59 bottom + aMargin.bottom, left + aMargin.left); | |
| 60 } | |
| 61 Sub operator-(const Sub& aMargin) const { | |
| 62 return Sub(top - aMargin.top, right - aMargin.right, | |
| 63 bottom - aMargin.bottom, left - aMargin.left); | |
| 64 } | |
| 65 Sub& operator+=(const Sub& aMargin) { | |
| 66 top += aMargin.top; | |
| 67 right += aMargin.right; | |
| 68 bottom += aMargin.bottom; | |
| 69 left += aMargin.left; | |
| 70 return *static_cast<Sub*>(this); | |
| 71 } | |
| 72 }; | |
| 73 | |
| 74 } | |
| 75 } | |
| 76 | |
| 77 #endif /* MOZILLA_GFX_BASEMARGIN_H_ */ |
