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101 lines
2.3 KiB
101 lines
2.3 KiB
/*
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* Copyright (c) Meta Platforms, Inc. and affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*/
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#pragma once
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#include <tuple>
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#include <folly/Hash.h>
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#include <react/renderer/graphics/Float.h>
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#include <react/renderer/graphics/Rect.h>
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namespace facebook {
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namespace react {
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/*
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* Generic data structure describes some values associated with *edges*
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* of a rectangle.
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*/
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template <typename T>
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struct RectangleEdges {
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T left{};
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T top{};
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T right{};
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T bottom{};
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bool operator==(RectangleEdges<T> const &rhs) const noexcept {
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return std::tie(this->left, this->top, this->right, this->bottom) ==
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std::tie(rhs.left, rhs.top, rhs.right, rhs.bottom);
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}
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bool operator!=(RectangleEdges<T> const &rhs) const noexcept {
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return !(*this == rhs);
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}
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bool isUniform() const noexcept {
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return left == top && left == right && left == bottom;
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}
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static RectangleEdges<T> const ZERO;
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};
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template <typename T>
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constexpr RectangleEdges<T> const RectangleEdges<T>::ZERO = {};
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template <typename T>
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RectangleEdges<T> operator+(
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RectangleEdges<T> const &lhs,
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RectangleEdges<T> const &rhs) noexcept {
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return RectangleEdges<T>{
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lhs.left + rhs.left,
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lhs.top + rhs.top,
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lhs.right + rhs.right,
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lhs.bottom + rhs.bottom};
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}
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template <typename T>
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RectangleEdges<T> operator-(
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RectangleEdges<T> const &lhs,
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RectangleEdges<T> const &rhs) noexcept {
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return RectangleEdges<T>{
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lhs.left - rhs.left,
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lhs.top - rhs.top,
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lhs.right - rhs.right,
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lhs.bottom - rhs.bottom};
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}
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/*
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* EdgeInsets
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*/
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using EdgeInsets = RectangleEdges<Float>;
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/*
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* Adjusts a rectangle by the given edge insets.
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*/
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inline Rect insetBy(Rect const &rect, EdgeInsets const &insets) noexcept {
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return Rect{
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{rect.origin.x + insets.left, rect.origin.y + insets.top},
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{rect.size.width - insets.left - insets.right,
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rect.size.height - insets.top - insets.bottom}};
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}
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} // namespace react
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} // namespace facebook
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namespace std {
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template <typename T>
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struct hash<facebook::react::RectangleEdges<T>> {
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size_t operator()(
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facebook::react::RectangleEdges<T> const &edges) const noexcept {
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return folly::hash::hash_combine(
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0, edges.left, edges.right, edges.top, edges.bottom);
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}
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};
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} // namespace std
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