mirror of https://github.com/SnapKit/SnapKit
62 lines
2.0 KiB
Swift
62 lines
2.0 KiB
Swift
//
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// SnapKit
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//
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// Copyright (c) 2011-Present SnapKit Team - https://github.com/SnapKit
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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#if os(iOS) || os(tvOS)
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import UIKit
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#else
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import AppKit
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#endif
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public final class ConstraintItem {
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internal weak var target: AnyObject?
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internal let attributes: ConstraintAttributes
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internal init(target: AnyObject?, attributes: ConstraintAttributes) {
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self.target = target
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self.attributes = attributes
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}
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internal var layoutConstraintItem: LayoutConstraintItem? {
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return self.target as? LayoutConstraintItem
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}
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}
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public func ==(lhs: ConstraintItem, rhs: ConstraintItem) -> Bool {
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// pointer equality
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guard lhs !== rhs else {
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return true
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}
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// must both have valid targets and identical attributes
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guard let target1 = lhs.target,
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let target2 = rhs.target,
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target1 === target2 && lhs.attributes == rhs.attributes else {
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return false
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}
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return true
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}
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