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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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 <ostream>
+
+#include "Types.h"
+
+namespace mozilla {
+
+/**
+ * Sides represents a set of physical sides.
+ */
+struct Sides final {
+ Sides() : mBits(SideBits::eNone) {}
+ explicit Sides(SideBits aSideBits) {
+ MOZ_ASSERT((aSideBits & ~SideBits::eAll) == SideBits::eNone,
+ "illegal side bits");
+ mBits = aSideBits;
+ }
+ bool IsEmpty() const { return mBits == SideBits::eNone; }
+ bool Top() const { return (mBits & SideBits::eTop) == SideBits::eTop; }
+ bool Right() const { return (mBits & SideBits::eRight) == SideBits::eRight; }
+ bool Bottom() const {
+ return (mBits & SideBits::eBottom) == SideBits::eBottom;
+ }
+ bool Left() const { return (mBits & SideBits::eLeft) == SideBits::eLeft; }
+ bool Contains(SideBits aSideBits) const {
+ MOZ_ASSERT(!(aSideBits & ~SideBits::eAll), "illegal side bits");
+ return (mBits & aSideBits) == aSideBits;
+ }
+ Sides operator|(Sides aOther) const {
+ return Sides(SideBits(mBits | aOther.mBits));
+ }
+ Sides operator|(SideBits aSideBits) const { return *this | Sides(aSideBits); }
+ Sides& operator|=(Sides aOther) {
+ mBits |= aOther.mBits;
+ return *this;
+ }
+ Sides& operator|=(SideBits aSideBits) { return *this |= Sides(aSideBits); }
+ bool operator==(Sides aOther) const { return mBits == aOther.mBits; }
+ bool operator!=(Sides aOther) const { return !(*this == aOther); }
+
+ private:
+ SideBits mBits;
+};
+
+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::Side SideT; // because we have a method named Side
+
+ // 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 aTop, T aRight, T aBottom, T aLeft)
+ : top(aTop), right(aRight), bottom(aBottom), left(aLeft) {}
+
+ void SizeTo(T aTop, T aRight, T aBottom, T aLeft) {
+ top = aTop;
+ right = aRight;
+ bottom = aBottom;
+ left = aLeft;
+ }
+
+ T LeftRight() const { return left + right; }
+ T TopBottom() const { return top + bottom; }
+
+ T& Side(SideT aSide) {
+ // This is ugly!
+ return *(&top + int(aSide));
+ }
+ T Side(SideT aSide) const {
+ // This is ugly!
+ return *(&top + int(aSide));
+ }
+
+ Sub& ApplySkipSides(Sides aSkipSides) {
+ if (aSkipSides.Top()) {
+ top = 0;
+ }
+ if (aSkipSides.Right()) {
+ right = 0;
+ }
+ if (aSkipSides.Bottom()) {
+ bottom = 0;
+ }
+ if (aSkipSides.Left()) {
+ left = 0;
+ }
+ return *static_cast<Sub*>(this);
+ }
+
+ // Ensures that all our sides are at least as big as the argument.
+ void EnsureAtLeast(const BaseMargin& aMargin) {
+ top = std::max(top, aMargin.top);
+ right = std::max(right, aMargin.right);
+ bottom = std::max(bottom, aMargin.bottom);
+ left = std::max(left, aMargin.left);
+ }
+
+ // Ensures that all our sides are at most as big as the argument.
+ void EnsureAtMost(const BaseMargin& aMargin) {
+ top = std::min(top, aMargin.top);
+ right = std::min(right, aMargin.right);
+ bottom = std::min(bottom, aMargin.bottom);
+ left = std::min(left, aMargin.left);
+ }
+
+ // Overloaded operators. Note that '=' isn't defined so we'll get the
+ // compiler generated default assignment operator
+ bool operator==(const Sub& aMargin) const {
+ return top == aMargin.top && right == aMargin.right &&
+ bottom == aMargin.bottom && left == aMargin.left;
+ }
+ bool operator!=(const Sub& aMargin) const { return !(*this == aMargin); }
+ Sub operator+(const Sub& aMargin) const {
+ return Sub(top + aMargin.top, right + aMargin.right,
+ bottom + aMargin.bottom, left + aMargin.left);
+ }
+ Sub operator-(const Sub& aMargin) const {
+ return Sub(top - aMargin.top, right - aMargin.right,
+ bottom - aMargin.bottom, left - aMargin.left);
+ }
+ Sub operator-() const { return Sub(-top, -right, -bottom, -left); }
+ Sub& operator+=(const Sub& aMargin) {
+ top += aMargin.top;
+ right += aMargin.right;
+ bottom += aMargin.bottom;
+ left += aMargin.left;
+ return *static_cast<Sub*>(this);
+ }
+ Sub& operator-=(const Sub& aMargin) {
+ top -= aMargin.top;
+ right -= aMargin.right;
+ bottom -= aMargin.bottom;
+ left -= aMargin.left;
+ return *static_cast<Sub*>(this);
+ }
+
+ friend std::ostream& operator<<(std::ostream& aStream,
+ const BaseMargin& aMargin) {
+ return aStream << "(t=" << aMargin.top << ", r=" << aMargin.right
+ << ", b=" << aMargin.bottom << ", l=" << aMargin.left << ')';
+ }
+};
+
+} // namespace gfx
+} // namespace mozilla
+
+#endif /* MOZILLA_GFX_BASEMARGIN_H_ */