ConstraintMakerRelatable.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 ConstraintMakerRelatable {
internal let description: ConstraintDescription
internal init(_ description: ConstraintDescription) {
self.description = description
}
internal func relatedTo(_ other: ConstraintRelatableTarget, relation: ConstraintRelation, file: String, line: UInt) -> ConstraintMakerEditable {
let related: ConstraintItem
let constant: ConstraintConstantTarget
if let other = other as? ConstraintItem {
guard other.attributes == ConstraintAttributes.none ||
other.attributes.layoutAttributes.count <= 1 ||
other.attributes.layoutAttributes == self.description.attributes.layoutAttributes ||
other.attributes == .edges && self.description.attributes == .margins ||
other.attributes == .margins && self.description.attributes == .edges else {
fatalError("Cannot constraint to multiple non identical attributes. (\(file), \(line))");
}
related = other
constant = 0.0
} else if let other = other as? ConstraintView {
related = ConstraintItem(target: other, attributes: ConstraintAttributes.none)
constant = 0.0
} else if let other = other as? ConstraintConstantTarget {
related = ConstraintItem(target: nil, attributes: ConstraintAttributes.none)
constant = other
} else if #available(iOS 9.0, OSX 10.11, *), let other = other as? ConstraintLayoutGuide {
related = ConstraintItem(target: other, attributes: ConstraintAttributes.none)
constant = 0.0
} else {
fatalError("Invalid constraint. (\(file), \(line))")
}
let editable = ConstraintMakerEditable(self.description)
editable.description.sourceLocation = (file, line)
editable.description.relation = relation
editable.description.related = related
editable.description.constant = constant
return editable
}
@discardableResult
public func equalTo(_ other: ConstraintRelatableTarget, _ file: String = #file, _ line: UInt = #line) -> ConstraintMakerEditable {
return self.relatedTo(other, relation: .equal, file: file, line: line)
}
@discardableResult
public func equalToSuperview(_ file: String = #file, _ line: UInt = #line) -> ConstraintMakerEditable {
guard let other = self.description.item.superview else {
fatalError("Expected superview but found nil when attempting make constraint `equalToSuperview`.")
}
return self.relatedTo(other, relation: .equal, file: file, line: line)
}
@discardableResult
public func lessThanOrEqualTo(_ other: ConstraintRelatableTarget, _ file: String = #file, _ line: UInt = #line) -> ConstraintMakerEditable {
return self.relatedTo(other, relation: .lessThanOrEqual, file: file, line: line)
}
@discardableResult
public func lessThanOrEqualToSuperview(_ file: String = #file, _ line: UInt = #line) -> ConstraintMakerEditable {
guard let other = self.description.item.superview else {
fatalError("Expected superview but found nil when attempting make constraint `lessThanOrEqualToSuperview`.")
}
return self.relatedTo(other, relation: .lessThanOrEqual, file: file, line: line)
}
@discardableResult
public func greaterThanOrEqualTo(_ other: ConstraintRelatableTarget, _ file: String = #file, line: UInt = #line) -> ConstraintMakerEditable {
return self.relatedTo(other, relation: .greaterThanOrEqual, file: file, line: line)
}
@discardableResult
public func greaterThanOrEqualToSuperview(_ file: String = #file, line: UInt = #line) -> ConstraintMakerEditable {
guard let other = self.description.item.superview else {
fatalError("Expected superview but found nil when attempting make constraint `greaterThanOrEqualToSuperview`.")
}
return self.relatedTo(other, relation: .greaterThanOrEqual, file: file, line: line)
}
}