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78 lines
2.2 KiB
C++
78 lines
2.2 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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#ifndef MOZILLA_GFX_BASEMARGIN_H_
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#define MOZILLA_GFX_BASEMARGIN_H_
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#include "Types.h"
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namespace mozilla {
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namespace gfx {
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/**
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* Do not use this class directly. Subclass it, pass that subclass as the
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* Sub parameter, and only use that subclass.
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*/
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template <class T, class Sub>
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struct BaseMargin {
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typedef mozilla::css::Side SideT;
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// Do not change the layout of these members; the Side() methods below
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// depend on this order.
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T top, right, bottom, left;
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// Constructors
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BaseMargin() : top(0), right(0), bottom(0), left(0) {}
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BaseMargin(T aLeft, T aTop, T aRight, T aBottom) :
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top(aTop), right(aRight), bottom(aBottom), left(aLeft) {}
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void SizeTo(T aLeft, T aTop, T aRight, T aBottom)
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{
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left = aLeft; top = aTop; right = aRight; bottom = aBottom;
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}
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T LeftRight() const { return left + right; }
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T TopBottom() const { return top + bottom; }
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T& Side(SideT aSide) {
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// This is ugly!
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return *(&top + aSide);
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}
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T Side(SideT aSide) const {
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// This is ugly!
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return *(&top + aSide);
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}
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// Overloaded operators. Note that '=' isn't defined so we'll get the
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// compiler generated default assignment operator
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bool operator==(const Sub& aMargin) const {
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return left == aMargin.left && top == aMargin.top &&
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right == aMargin.right && bottom == aMargin.bottom;
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}
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bool operator!=(const Sub& aMargin) const {
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return !(*this == aMargin);
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}
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Sub operator+(const Sub& aMargin) const {
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return Sub(left + aMargin.left, top + aMargin.top,
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right + aMargin.right, bottom + aMargin.bottom);
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}
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Sub operator-(const Sub& aMargin) const {
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return Sub(left - aMargin.left, top - aMargin.top,
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right - aMargin.right, bottom - aMargin.bottom);
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}
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Sub& operator+=(const Sub& aMargin) {
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left += aMargin.left;
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top += aMargin.top;
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right += aMargin.right;
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bottom += aMargin.bottom;
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return *static_cast<Sub*>(this);
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}
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};
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}
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}
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#endif /* MOZILLA_GFX_BASEMARGIN_H_ */
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