ConstraintItem.swift
2.04 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
//
// SnapKit
//
// Copyright (c) 2011-Present SnapKit Team - https://github.com/SnapKit
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
#if os(iOS) || os(tvOS)
import UIKit
#else
import AppKit
#endif
public final class ConstraintItem {
internal weak var target: AnyObject?
internal let attributes: ConstraintAttributes
internal init(target: AnyObject?, attributes: ConstraintAttributes) {
self.target = target
self.attributes = attributes
}
internal var layoutConstraintItem: LayoutConstraintItem? {
return self.target as? LayoutConstraintItem
}
}
public func ==(lhs: ConstraintItem, rhs: ConstraintItem) -> Bool {
// pointer equality
guard lhs !== rhs else {
return true
}
// must both have valid targets and identical attributes
guard let target1 = lhs.target,
let target2 = rhs.target,
target1 === target2 && lhs.attributes == rhs.attributes else {
return false
}
return true
}