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