1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/gfx/2d/BaseMargin.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,77 @@
1.4 +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
1.5 + * This Source Code Form is subject to the terms of the Mozilla Public
1.6 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.7 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.8 +
1.9 +#ifndef MOZILLA_GFX_BASEMARGIN_H_
1.10 +#define MOZILLA_GFX_BASEMARGIN_H_
1.11 +
1.12 +#include "Types.h"
1.13 +
1.14 +namespace mozilla {
1.15 +namespace gfx {
1.16 +
1.17 +/**
1.18 + * Do not use this class directly. Subclass it, pass that subclass as the
1.19 + * Sub parameter, and only use that subclass.
1.20 + */
1.21 +template <class T, class Sub>
1.22 +struct BaseMargin {
1.23 + typedef mozilla::css::Side SideT;
1.24 +
1.25 + // Do not change the layout of these members; the Side() methods below
1.26 + // depend on this order.
1.27 + T top, right, bottom, left;
1.28 +
1.29 + // Constructors
1.30 + BaseMargin() : top(0), right(0), bottom(0), left(0) {}
1.31 + BaseMargin(T aTop, T aRight, T aBottom, T aLeft) :
1.32 + top(aTop), right(aRight), bottom(aBottom), left(aLeft) {}
1.33 +
1.34 + void SizeTo(T aTop, T aRight, T aBottom, T aLeft)
1.35 + {
1.36 + top = aTop; right = aRight; bottom = aBottom; left = aLeft;
1.37 + }
1.38 +
1.39 + T LeftRight() const { return left + right; }
1.40 + T TopBottom() const { return top + bottom; }
1.41 +
1.42 + T& Side(SideT aSide) {
1.43 + // This is ugly!
1.44 + return *(&top + T(aSide));
1.45 + }
1.46 + T Side(SideT aSide) const {
1.47 + // This is ugly!
1.48 + return *(&top + T(aSide));
1.49 + }
1.50 +
1.51 + // Overloaded operators. Note that '=' isn't defined so we'll get the
1.52 + // compiler generated default assignment operator
1.53 + bool operator==(const Sub& aMargin) const {
1.54 + return top == aMargin.top && right == aMargin.right &&
1.55 + bottom == aMargin.bottom && left == aMargin.left;
1.56 + }
1.57 + bool operator!=(const Sub& aMargin) const {
1.58 + return !(*this == aMargin);
1.59 + }
1.60 + Sub operator+(const Sub& aMargin) const {
1.61 + return Sub(top + aMargin.top, right + aMargin.right,
1.62 + bottom + aMargin.bottom, left + aMargin.left);
1.63 + }
1.64 + Sub operator-(const Sub& aMargin) const {
1.65 + return Sub(top - aMargin.top, right - aMargin.right,
1.66 + bottom - aMargin.bottom, left - aMargin.left);
1.67 + }
1.68 + Sub& operator+=(const Sub& aMargin) {
1.69 + top += aMargin.top;
1.70 + right += aMargin.right;
1.71 + bottom += aMargin.bottom;
1.72 + left += aMargin.left;
1.73 + return *static_cast<Sub*>(this);
1.74 + }
1.75 +};
1.76 +
1.77 +}
1.78 +}
1.79 +
1.80 +#endif /* MOZILLA_GFX_BASEMARGIN_H_ */
