ConstraintDescription.swift
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//
// 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 class ConstraintDescription {
internal let item: LayoutConstraintItem
internal var attributes: ConstraintAttributes
internal var relation: ConstraintRelation? = nil
internal var sourceLocation: (String, UInt)? = nil
internal var label: String? = nil
internal var related: ConstraintItem? = nil
internal var multiplier: ConstraintMultiplierTarget = 1.0
internal var constant: ConstraintConstantTarget = 0.0
internal var priority: ConstraintPriorityTarget = 1000.0
internal lazy var constraint: Constraint? = {
guard let relation = self.relation,
let related = self.related,
let sourceLocation = self.sourceLocation else {
return nil
}
let from = ConstraintItem(target: self.item, attributes: self.attributes)
return Constraint(
from: from,
to: related,
relation: relation,
sourceLocation: sourceLocation,
label: self.label,
multiplier: self.multiplier,
constant: self.constant,
priority: self.priority
)
}()
// MARK: Initialization
internal init(item: LayoutConstraintItem, attributes: ConstraintAttributes) {
self.item = item
self.attributes = attributes
}
}