mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-11-02 07:05:24 +00:00
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 -*-
|
|
* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
|
|
|
|
#ifndef MOZILLA_GFX_BASEMARGIN_H_
|
|
#define MOZILLA_GFX_BASEMARGIN_H_
|
|
|
|
#include "Types.h"
|
|
|
|
namespace mozilla {
|
|
namespace gfx {
|
|
|
|
/**
|
|
* Do not use this class directly. Subclass it, pass that subclass as the
|
|
* Sub parameter, and only use that subclass.
|
|
*/
|
|
template <class T, class Sub>
|
|
struct BaseMargin {
|
|
typedef mozilla::css::Side SideT;
|
|
|
|
// Do not change the layout of these members; the Side() methods below
|
|
// depend on this order.
|
|
T top, right, bottom, left;
|
|
|
|
// Constructors
|
|
BaseMargin() : top(0), right(0), bottom(0), left(0) {}
|
|
BaseMargin(T aLeft, T aTop, T aRight, T aBottom) :
|
|
top(aTop), right(aRight), bottom(aBottom), left(aLeft) {}
|
|
|
|
void SizeTo(T aLeft, T aTop, T aRight, T aBottom)
|
|
{
|
|
left = aLeft; top = aTop; right = aRight; bottom = aBottom;
|
|
}
|
|
|
|
T LeftRight() const { return left + right; }
|
|
T TopBottom() const { return top + bottom; }
|
|
|
|
T& Side(SideT aSide) {
|
|
// This is ugly!
|
|
return *(&top + aSide);
|
|
}
|
|
T Side(SideT aSide) const {
|
|
// This is ugly!
|
|
return *(&top + aSide);
|
|
}
|
|
|
|
// Overloaded operators. Note that '=' isn't defined so we'll get the
|
|
// compiler generated default assignment operator
|
|
bool operator==(const Sub& aMargin) const {
|
|
return left == aMargin.left && top == aMargin.top &&
|
|
right == aMargin.right && bottom == aMargin.bottom;
|
|
}
|
|
bool operator!=(const Sub& aMargin) const {
|
|
return !(*this == aMargin);
|
|
}
|
|
Sub operator+(const Sub& aMargin) const {
|
|
return Sub(left + aMargin.left, top + aMargin.top,
|
|
right + aMargin.right, bottom + aMargin.bottom);
|
|
}
|
|
Sub operator-(const Sub& aMargin) const {
|
|
return Sub(left - aMargin.left, top - aMargin.top,
|
|
right - aMargin.right, bottom - aMargin.bottom);
|
|
}
|
|
Sub& operator+=(const Sub& aMargin) {
|
|
left += aMargin.left;
|
|
top += aMargin.top;
|
|
right += aMargin.right;
|
|
bottom += aMargin.bottom;
|
|
return *static_cast<Sub*>(this);
|
|
}
|
|
};
|
|
|
|
}
|
|
}
|
|
|
|
#endif /* MOZILLA_GFX_BASEMARGIN_H_ */
|