mirror of
https://github.com/classilla/tenfourfox.git
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145 lines
3.8 KiB
C++
145 lines
3.8 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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/**
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* Sides represents a set of physical sides.
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*/
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struct Sides final {
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Sides() : mBits(0) {}
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explicit Sides(SideBits aSideBits)
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{
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MOZ_ASSERT((aSideBits & ~eSideBitsAll) == 0, "illegal side bits");
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mBits = aSideBits;
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}
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bool IsEmpty() const { return mBits == 0; }
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bool Top() const { return mBits & eSideBitsTop; }
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bool Right() const { return mBits & eSideBitsRight; }
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bool Bottom() const { return mBits & eSideBitsBottom; }
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bool Left() const { return mBits & eSideBitsLeft; }
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bool Contains(SideBits aSideBits) const
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{
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MOZ_ASSERT((aSideBits & ~eSideBitsAll) == 0, "illegal side bits");
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return (mBits & aSideBits) == aSideBits;
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}
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Sides operator|(Sides aOther) const
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{
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return Sides(SideBits(mBits | aOther.mBits));
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}
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Sides operator|(SideBits aSideBits) const
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{
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return *this | Sides(aSideBits);
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}
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Sides& operator|=(Sides aOther)
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{
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mBits |= aOther.mBits;
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return *this;
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}
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Sides& operator|=(SideBits aSideBits)
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{
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return *this |= Sides(aSideBits);
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}
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bool operator==(Sides aOther) const
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{
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return mBits == aOther.mBits;
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}
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bool operator!=(Sides aOther) const
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{
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return !(*this == aOther);
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}
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private:
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uint8_t mBits;
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};
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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::Side SideT; // because we have a method named Side
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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 aTop, T aRight, T aBottom, T aLeft) :
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top(aTop), right(aRight), bottom(aBottom), left(aLeft) {}
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void SizeTo(T aTop, T aRight, T aBottom, T aLeft)
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{
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top = aTop; right = aRight; bottom = aBottom; left = aLeft;
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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 + int(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 + int(aSide));
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}
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void ApplySkipSides(Sides aSkipSides)
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{
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if (aSkipSides.Top()) {
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top = 0;
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}
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if (aSkipSides.Right()) {
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right = 0;
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}
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if (aSkipSides.Bottom()) {
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bottom = 0;
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}
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if (aSkipSides.Left()) {
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left = 0;
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}
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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 top == aMargin.top && right == aMargin.right &&
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bottom == aMargin.bottom && left == aMargin.left;
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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(top + aMargin.top, right + aMargin.right,
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bottom + aMargin.bottom, left + aMargin.left);
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}
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Sub operator-(const Sub& aMargin) const {
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return Sub(top - aMargin.top, right - aMargin.right,
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bottom - aMargin.bottom, left - aMargin.left);
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}
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Sub& operator+=(const Sub& aMargin) {
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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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left += aMargin.left;
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return *static_cast<Sub*>(this);
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}
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};
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} // namespace gfx
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} // namespace mozilla
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#endif /* MOZILLA_GFX_BASEMARGIN_H_ */
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