mirror of https://github.com/SnapKit/SnapKit
547 lines
25 KiB
Swift
547 lines
25 KiB
Swift
//
|
||
// Snap
|
||
//
|
||
// Copyright (c) 2011-2015 Masonry Team - https://github.com/Masonry
|
||
//
|
||
// 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)
|
||
import UIKit
|
||
#else
|
||
import AppKit
|
||
#endif
|
||
|
||
/**
|
||
Used to expose the final API of a `ConstraintDescription` which allows getting a constraint from it
|
||
*/
|
||
public protocol ConstraintDescriptionFinalizable: class {
|
||
|
||
var constraint: Constraint { get }
|
||
|
||
}
|
||
|
||
/**
|
||
Used to expose priority APIs
|
||
*/
|
||
public protocol ConstraintDescriptionPriortizable: ConstraintDescriptionFinalizable {
|
||
|
||
func priority(priority: Float) -> ConstraintDescriptionFinalizable
|
||
func priority(priority: Double) -> ConstraintDescriptionFinalizable
|
||
func priority(priority: CGFloat) -> ConstraintDescriptionFinalizable
|
||
func priority(priority: UInt) -> ConstraintDescriptionFinalizable
|
||
func priority(priority: Int) -> ConstraintDescriptionFinalizable
|
||
func priorityRequired() -> ConstraintDescriptionFinalizable
|
||
func priorityHigh() -> ConstraintDescriptionFinalizable
|
||
func priorityMedium() -> ConstraintDescriptionFinalizable
|
||
func priorityLow() -> ConstraintDescriptionFinalizable
|
||
}
|
||
|
||
/**
|
||
Used to expose multiplier APIs
|
||
*/
|
||
public protocol ConstraintDescriptionMultipliable: ConstraintDescriptionPriortizable {
|
||
|
||
func multipliedBy(amount: Float) -> ConstraintDescriptionPriortizable
|
||
func multipliedBy(amount: Double) -> ConstraintDescriptionPriortizable
|
||
func multipliedBy(amount: CGFloat) -> ConstraintDescriptionPriortizable
|
||
func multipliedBy(amount: Int) -> ConstraintDescriptionPriortizable
|
||
func multipliedBy(amount: UInt) -> ConstraintDescriptionPriortizable
|
||
|
||
func dividedBy(amount: Float) -> ConstraintDescriptionPriortizable
|
||
func dividedBy(amount: Double) -> ConstraintDescriptionPriortizable
|
||
func dividedBy(amount: CGFloat) -> ConstraintDescriptionPriortizable
|
||
func dividedBy(amount: Int) -> ConstraintDescriptionPriortizable
|
||
func dividedBy(amount: UInt) -> ConstraintDescriptionPriortizable
|
||
}
|
||
|
||
/**
|
||
Used to expose constant APIs
|
||
*/
|
||
public protocol ConstraintDescriptionOffsetable: ConstraintDescriptionMultipliable {
|
||
|
||
func offset(amount: Float) -> ConstraintDescriptionMultipliable
|
||
func offset(amount: Double) -> ConstraintDescriptionMultipliable
|
||
func offset(amount: CGFloat) -> ConstraintDescriptionMultipliable
|
||
func offset(amount: Int) -> ConstraintDescriptionMultipliable
|
||
func offset(amount: UInt) -> ConstraintDescriptionMultipliable
|
||
func offset(amount: CGPoint) -> ConstraintDescriptionMultipliable
|
||
func offset(amount: CGSize) -> ConstraintDescriptionMultipliable
|
||
func offset(amount: EdgeInsets) -> ConstraintDescriptionMultipliable
|
||
|
||
func insets(amount: EdgeInsets) -> ConstraintDescriptionMultipliable
|
||
}
|
||
|
||
/**
|
||
Used to expose relation APIs
|
||
*/
|
||
public protocol ConstraintDescriptionRelatable: class {
|
||
|
||
func equalTo(other: ConstraintItem) -> ConstraintDescriptionOffsetable
|
||
func equalTo(other: View) -> ConstraintDescriptionOffsetable
|
||
#if os(iOS)
|
||
func equalTo(other: UILayoutSupport) -> ConstraintDescriptionOffsetable
|
||
#endif
|
||
func equalTo(other: Float) -> ConstraintDescriptionMultipliable
|
||
func equalTo(other: Double) -> ConstraintDescriptionMultipliable
|
||
func equalTo(other: CGFloat) -> ConstraintDescriptionMultipliable
|
||
func equalTo(other: Int) -> ConstraintDescriptionMultipliable
|
||
func equalTo(other: UInt) -> ConstraintDescriptionMultipliable
|
||
func equalTo(other: CGSize) -> ConstraintDescriptionMultipliable
|
||
func equalTo(other: CGPoint) -> ConstraintDescriptionMultipliable
|
||
func equalTo(other: EdgeInsets) -> ConstraintDescriptionMultipliable
|
||
|
||
func lessThanOrEqualTo(other: ConstraintItem) -> ConstraintDescriptionOffsetable
|
||
func lessThanOrEqualTo(other: View) -> ConstraintDescriptionOffsetable
|
||
#if os(iOS)
|
||
func lessThanOrEqualTo(other: UILayoutSupport) -> ConstraintDescriptionOffsetable
|
||
#endif
|
||
func lessThanOrEqualTo(other: Float) -> ConstraintDescriptionMultipliable
|
||
func lessThanOrEqualTo(other: Double) -> ConstraintDescriptionMultipliable
|
||
func lessThanOrEqualTo(other: CGFloat) -> ConstraintDescriptionMultipliable
|
||
func lessThanOrEqualTo(other: Int) -> ConstraintDescriptionMultipliable
|
||
func lessThanOrEqualTo(other: UInt) -> ConstraintDescriptionMultipliable
|
||
func lessThanOrEqualTo(other: CGSize) -> ConstraintDescriptionMultipliable
|
||
func lessThanOrEqualTo(other: CGPoint) -> ConstraintDescriptionMultipliable
|
||
func lessThanOrEqualTo(other: EdgeInsets) -> ConstraintDescriptionMultipliable
|
||
|
||
func greaterThanOrEqualTo(other: ConstraintItem) -> ConstraintDescriptionOffsetable
|
||
func greaterThanOrEqualTo(other: View) -> ConstraintDescriptionOffsetable
|
||
#if os(iOS)
|
||
func greaterThanOrEqualTo(other: UILayoutSupport) -> ConstraintDescriptionOffsetable
|
||
#endif
|
||
func greaterThanOrEqualTo(other: Float) -> ConstraintDescriptionMultipliable
|
||
func greaterThanOrEqualTo(other: Double) -> ConstraintDescriptionMultipliable
|
||
func greaterThanOrEqualTo(other: CGFloat) -> ConstraintDescriptionMultipliable
|
||
func greaterThanOrEqualTo(other: Int) -> ConstraintDescriptionMultipliable
|
||
func greaterThanOrEqualTo(other: UInt) -> ConstraintDescriptionMultipliable
|
||
func greaterThanOrEqualTo(other: CGSize) -> ConstraintDescriptionMultipliable
|
||
func greaterThanOrEqualTo(other: CGPoint) -> ConstraintDescriptionMultipliable
|
||
func greaterThanOrEqualTo(other: EdgeInsets) -> ConstraintDescriptionMultipliable
|
||
|
||
}
|
||
|
||
/**
|
||
Used to expose chaining APIs
|
||
*/
|
||
public protocol ConstraintDescriptionExtendable: ConstraintDescriptionRelatable {
|
||
|
||
var left: ConstraintDescriptionExtendable { get }
|
||
var top: ConstraintDescriptionExtendable { get }
|
||
var bottom: ConstraintDescriptionExtendable { get }
|
||
var right: ConstraintDescriptionExtendable { get }
|
||
var leading: ConstraintDescriptionExtendable { get }
|
||
var trailing: ConstraintDescriptionExtendable { get }
|
||
var width: ConstraintDescriptionExtendable { get }
|
||
var height: ConstraintDescriptionExtendable { get }
|
||
var centerX: ConstraintDescriptionExtendable { get }
|
||
var centerY: ConstraintDescriptionExtendable { get }
|
||
var baseline: ConstraintDescriptionExtendable { get }
|
||
|
||
#if os(iOS)
|
||
var firstBaseline: ConstraintDescriptionExtendable { get }
|
||
var leftMargin: ConstraintDescriptionExtendable { get }
|
||
var rightMargin: ConstraintDescriptionExtendable { get }
|
||
var topMargin: ConstraintDescriptionExtendable { get }
|
||
var bottomMargin: ConstraintDescriptionExtendable { get }
|
||
var leadingMargin: ConstraintDescriptionExtendable { get }
|
||
var trailingMargin: ConstraintDescriptionExtendable { get }
|
||
var centerXWithinMargins: ConstraintDescriptionExtendable { get }
|
||
var centerYWithinMargins: ConstraintDescriptionExtendable { get }
|
||
#endif
|
||
}
|
||
|
||
/**
|
||
Used to internally manage building constraint
|
||
*/
|
||
final internal class ConstraintDescription: ConstraintDescriptionExtendable, ConstraintDescriptionOffsetable, ConstraintDescriptionFinalizable {
|
||
|
||
internal var left: ConstraintDescriptionExtendable { return self.addConstraint(ConstraintAttributes.Left) }
|
||
internal var top: ConstraintDescriptionExtendable { return self.addConstraint(ConstraintAttributes.Top) }
|
||
internal var right: ConstraintDescriptionExtendable { return self.addConstraint(ConstraintAttributes.Right) }
|
||
internal var bottom: ConstraintDescriptionExtendable { return self.addConstraint(ConstraintAttributes.Bottom) }
|
||
internal var leading: ConstraintDescriptionExtendable { return self.addConstraint(ConstraintAttributes.Leading) }
|
||
internal var trailing: ConstraintDescriptionExtendable { return self.addConstraint(ConstraintAttributes.Trailing) }
|
||
internal var width: ConstraintDescriptionExtendable { return self.addConstraint(ConstraintAttributes.Width) }
|
||
internal var height: ConstraintDescriptionExtendable { return self.addConstraint(ConstraintAttributes.Height) }
|
||
internal var centerX: ConstraintDescriptionExtendable { return self.addConstraint(ConstraintAttributes.CenterX) }
|
||
internal var centerY: ConstraintDescriptionExtendable { return self.addConstraint(ConstraintAttributes.CenterY) }
|
||
internal var baseline: ConstraintDescriptionExtendable { return self.addConstraint(ConstraintAttributes.Baseline) }
|
||
|
||
#if os(iOS)
|
||
internal var firstBaseline: ConstraintDescriptionExtendable { return self.addConstraint(ConstraintAttributes.FirstBaseline) }
|
||
internal var leftMargin: ConstraintDescriptionExtendable { return self.addConstraint(ConstraintAttributes.LeftMargin) }
|
||
internal var rightMargin: ConstraintDescriptionExtendable { return self.addConstraint(ConstraintAttributes.RightMargin) }
|
||
internal var topMargin: ConstraintDescriptionExtendable { return self.addConstraint(ConstraintAttributes.TopMargin) }
|
||
internal var bottomMargin: ConstraintDescriptionExtendable { return self.addConstraint(ConstraintAttributes.BottomMargin) }
|
||
internal var leadingMargin: ConstraintDescriptionExtendable { return self.addConstraint(ConstraintAttributes.LeadingMargin) }
|
||
internal var trailingMargin: ConstraintDescriptionExtendable { return self.addConstraint(ConstraintAttributes.TrailingMargin) }
|
||
internal var centerXWithinMargins: ConstraintDescriptionExtendable { return self.addConstraint(ConstraintAttributes.CenterXWithinMargins) }
|
||
internal var centerYWithinMargins: ConstraintDescriptionExtendable { return self.addConstraint(ConstraintAttributes.CenterYWithinMargins) }
|
||
#endif
|
||
|
||
// MARK: initializer
|
||
|
||
init(fromItem: ConstraintItem) {
|
||
self.fromItem = fromItem
|
||
self.toItem = ConstraintItem(object: nil, attributes: ConstraintAttributes.None)
|
||
}
|
||
|
||
// MARK: equalTo
|
||
|
||
internal func equalTo(other: ConstraintItem) -> ConstraintDescriptionOffsetable {
|
||
return self.constrainTo(other, relation: .Equal)
|
||
}
|
||
internal func equalTo(other: View) -> ConstraintDescriptionOffsetable {
|
||
return self.constrainTo(other, relation: .Equal)
|
||
}
|
||
|
||
#if os(iOS)
|
||
internal func equalTo(other: UILayoutSupport) -> ConstraintDescriptionOffsetable {
|
||
return self.constrainTo(other, relation: .Equal)
|
||
}
|
||
#endif
|
||
internal func equalTo(other: Float) -> ConstraintDescriptionMultipliable {
|
||
return self.constrainTo(other, relation: .Equal)
|
||
}
|
||
internal func equalTo(other: Double) -> ConstraintDescriptionMultipliable {
|
||
return self.constrainTo(Float(other), relation: .Equal)
|
||
}
|
||
internal func equalTo(other: CGFloat) -> ConstraintDescriptionMultipliable {
|
||
return self.constrainTo(Float(other), relation: .Equal)
|
||
}
|
||
internal func equalTo(other: Int) -> ConstraintDescriptionMultipliable {
|
||
return self.constrainTo(Float(other), relation: .Equal)
|
||
}
|
||
internal func equalTo(other: UInt) -> ConstraintDescriptionMultipliable {
|
||
return self.constrainTo(Float(other), relation: .Equal)
|
||
}
|
||
internal func equalTo(other: CGSize) -> ConstraintDescriptionMultipliable {
|
||
return self.constrainTo(other, relation: .Equal)
|
||
}
|
||
internal func equalTo(other: CGPoint) -> ConstraintDescriptionMultipliable {
|
||
return self.constrainTo(other, relation: .Equal)
|
||
}
|
||
internal func equalTo(other: EdgeInsets) -> ConstraintDescriptionMultipliable {
|
||
return self.constrainTo(other, relation: .Equal)
|
||
}
|
||
|
||
// MARK: lessThanOrEqualTo
|
||
|
||
internal func lessThanOrEqualTo(other: ConstraintItem) -> ConstraintDescriptionOffsetable {
|
||
return self.constrainTo(other, relation: .LessThanOrEqualTo)
|
||
}
|
||
internal func lessThanOrEqualTo(other: View) -> ConstraintDescriptionOffsetable {
|
||
return self.constrainTo(other, relation: .LessThanOrEqualTo)
|
||
}
|
||
#if os(iOS)
|
||
internal func lessThanOrEqualTo(other: UILayoutSupport) -> ConstraintDescriptionOffsetable {
|
||
return self.constrainTo(other, relation: .LessThanOrEqualTo)
|
||
}
|
||
#endif
|
||
internal func lessThanOrEqualTo(other: Float) -> ConstraintDescriptionMultipliable {
|
||
return self.constrainTo(other, relation: .LessThanOrEqualTo)
|
||
}
|
||
internal func lessThanOrEqualTo(other: Double) -> ConstraintDescriptionMultipliable {
|
||
return self.constrainTo(Float(other), relation: .LessThanOrEqualTo)
|
||
}
|
||
internal func lessThanOrEqualTo(other: CGFloat) -> ConstraintDescriptionMultipliable {
|
||
return self.constrainTo(Float(other), relation: .LessThanOrEqualTo)
|
||
}
|
||
internal func lessThanOrEqualTo(other: Int) -> ConstraintDescriptionMultipliable {
|
||
return self.constrainTo(Float(other), relation: .LessThanOrEqualTo)
|
||
}
|
||
internal func lessThanOrEqualTo(other: UInt) -> ConstraintDescriptionMultipliable {
|
||
return self.constrainTo(Float(other), relation: .LessThanOrEqualTo)
|
||
}
|
||
internal func lessThanOrEqualTo(other: CGSize) -> ConstraintDescriptionMultipliable {
|
||
return self.constrainTo(other, relation: .LessThanOrEqualTo)
|
||
}
|
||
internal func lessThanOrEqualTo(other: CGPoint) -> ConstraintDescriptionMultipliable {
|
||
return self.constrainTo(other, relation: .LessThanOrEqualTo)
|
||
}
|
||
internal func lessThanOrEqualTo(other: EdgeInsets) -> ConstraintDescriptionMultipliable {
|
||
return self.constrainTo(other, relation: .LessThanOrEqualTo)
|
||
}
|
||
|
||
// MARK: greaterThanOrEqualTo
|
||
|
||
internal func greaterThanOrEqualTo(other: ConstraintItem) -> ConstraintDescriptionOffsetable {
|
||
return self.constrainTo(other, relation: .GreaterThanOrEqualTo)
|
||
}
|
||
internal func greaterThanOrEqualTo(other: View) -> ConstraintDescriptionOffsetable {
|
||
return self.constrainTo(other, relation: .GreaterThanOrEqualTo)
|
||
}
|
||
#if os(iOS)
|
||
internal func greaterThanOrEqualTo(other: UILayoutSupport) -> ConstraintDescriptionOffsetable {
|
||
return self.constrainTo(other, relation: .GreaterThanOrEqualTo)
|
||
}
|
||
#endif
|
||
internal func greaterThanOrEqualTo(other: Float) -> ConstraintDescriptionMultipliable {
|
||
return self.constrainTo(other, relation: .GreaterThanOrEqualTo)
|
||
}
|
||
internal func greaterThanOrEqualTo(other: Double) -> ConstraintDescriptionMultipliable {
|
||
return self.constrainTo(Float(other), relation: .GreaterThanOrEqualTo)
|
||
}
|
||
internal func greaterThanOrEqualTo(other: CGFloat) -> ConstraintDescriptionMultipliable {
|
||
return self.constrainTo(Float(other), relation: .GreaterThanOrEqualTo)
|
||
}
|
||
internal func greaterThanOrEqualTo(other: Int) -> ConstraintDescriptionMultipliable {
|
||
return self.constrainTo(Float(other), relation: .GreaterThanOrEqualTo)
|
||
}
|
||
internal func greaterThanOrEqualTo(other: UInt) -> ConstraintDescriptionMultipliable {
|
||
return self.constrainTo(Float(other), relation: .GreaterThanOrEqualTo)
|
||
}
|
||
internal func greaterThanOrEqualTo(other: CGSize) -> ConstraintDescriptionMultipliable {
|
||
return self.constrainTo(other, relation: .GreaterThanOrEqualTo)
|
||
}
|
||
internal func greaterThanOrEqualTo(other: CGPoint) -> ConstraintDescriptionMultipliable {
|
||
return self.constrainTo(other, relation: .GreaterThanOrEqualTo)
|
||
}
|
||
internal func greaterThanOrEqualTo(other: EdgeInsets) -> ConstraintDescriptionMultipliable {
|
||
return self.constrainTo(other, relation: .GreaterThanOrEqualTo)
|
||
}
|
||
|
||
// MARK: multiplier
|
||
|
||
internal func multipliedBy(amount: Float) -> ConstraintDescriptionPriortizable {
|
||
self.multiplier = amount
|
||
return self
|
||
}
|
||
internal func multipliedBy(amount: Double) -> ConstraintDescriptionPriortizable {
|
||
return self.multipliedBy(Float(amount))
|
||
}
|
||
internal func multipliedBy(amount: CGFloat) -> ConstraintDescriptionPriortizable {
|
||
return self.multipliedBy(Float(amount))
|
||
}
|
||
internal func multipliedBy(amount: Int) -> ConstraintDescriptionPriortizable {
|
||
return self.multipliedBy(Float(amount))
|
||
}
|
||
internal func multipliedBy(amount: UInt) -> ConstraintDescriptionPriortizable {
|
||
return self.multipliedBy(Float(amount))
|
||
}
|
||
|
||
internal func dividedBy(amount: Float) -> ConstraintDescriptionPriortizable {
|
||
self.multiplier = 1.0 / amount;
|
||
return self
|
||
}
|
||
internal func dividedBy(amount: Double) -> ConstraintDescriptionPriortizable {
|
||
return self.dividedBy(Float(amount))
|
||
}
|
||
internal func dividedBy(amount: CGFloat) -> ConstraintDescriptionPriortizable {
|
||
return self.dividedBy(Float(amount))
|
||
}
|
||
internal func dividedBy(amount: Int) -> ConstraintDescriptionPriortizable {
|
||
return self.dividedBy(Float(amount))
|
||
}
|
||
internal func dividedBy(amount: UInt) -> ConstraintDescriptionPriortizable {
|
||
return self.dividedBy(Float(amount))
|
||
}
|
||
|
||
// MARK: priority
|
||
|
||
internal func priority(priority: Float) -> ConstraintDescriptionFinalizable {
|
||
self.priority = priority
|
||
return self
|
||
}
|
||
internal func priority(priority: Double) -> ConstraintDescriptionFinalizable {
|
||
return self.priority(Float(priority))
|
||
}
|
||
internal func priority(priority: CGFloat) -> ConstraintDescriptionFinalizable {
|
||
return self.priority(Float(priority))
|
||
}
|
||
func priority(priority: UInt) -> ConstraintDescriptionFinalizable {
|
||
return self.priority(Float(priority))
|
||
}
|
||
internal func priority(priority: Int) -> ConstraintDescriptionFinalizable {
|
||
return self.priority(Float(priority))
|
||
}
|
||
internal func priorityRequired() -> ConstraintDescriptionFinalizable {
|
||
return self.priority(1000.0)
|
||
}
|
||
internal func priorityHigh() -> ConstraintDescriptionFinalizable {
|
||
return self.priority(750.0)
|
||
}
|
||
internal func priorityMedium() -> ConstraintDescriptionFinalizable {
|
||
#if os(iOS)
|
||
return self.priority(500.0)
|
||
#else
|
||
return self.priority(501.0)
|
||
#endif
|
||
}
|
||
internal func priorityLow() -> ConstraintDescriptionFinalizable {
|
||
return self.priority(250.0)
|
||
}
|
||
|
||
// MARK: offset
|
||
|
||
internal func offset(amount: Float) -> ConstraintDescriptionMultipliable {
|
||
self.constant = amount
|
||
return self
|
||
}
|
||
internal func offset(amount: Double) -> ConstraintDescriptionMultipliable {
|
||
return self.offset(Float(amount))
|
||
}
|
||
internal func offset(amount: CGFloat) -> ConstraintDescriptionMultipliable {
|
||
return self.offset(Float(amount))
|
||
}
|
||
internal func offset(amount: Int) -> ConstraintDescriptionMultipliable {
|
||
return self.offset(Float(amount))
|
||
}
|
||
internal func offset(amount: UInt) -> ConstraintDescriptionMultipliable {
|
||
return self.offset(Float(amount))
|
||
}
|
||
internal func offset(amount: CGPoint) -> ConstraintDescriptionMultipliable {
|
||
self.constant = amount
|
||
return self
|
||
}
|
||
internal func offset(amount: CGSize) -> ConstraintDescriptionMultipliable {
|
||
self.constant = amount
|
||
return self
|
||
}
|
||
internal func offset(amount: EdgeInsets) -> ConstraintDescriptionMultipliable {
|
||
self.constant = amount
|
||
return self
|
||
}
|
||
|
||
// MARK: insets
|
||
|
||
internal func insets(amount: EdgeInsets) -> ConstraintDescriptionMultipliable {
|
||
self.constant = EdgeInsets(top: amount.top, left: amount.left, bottom: -amount.bottom, right: -amount.right)
|
||
return self
|
||
}
|
||
|
||
// MARK: Constraint
|
||
|
||
internal var constraint: Constraint {
|
||
if self.concreteConstraint == nil {
|
||
if self.relation == nil {
|
||
fatalError("Attempting to create a constraint from a ConstraintDescription before it has been fully chained.")
|
||
}
|
||
self.concreteConstraint = ConcreteConstraint(
|
||
fromItem: self.fromItem,
|
||
toItem: self.toItem,
|
||
relation: self.relation!,
|
||
constant: self.constant,
|
||
multiplier: self.multiplier,
|
||
priority: self.priority)
|
||
}
|
||
return self.concreteConstraint!
|
||
}
|
||
|
||
// MARK: Private
|
||
|
||
private let fromItem: ConstraintItem
|
||
private var toItem: ConstraintItem {
|
||
willSet {
|
||
if self.concreteConstraint != nil {
|
||
fatalError("Attempting to modify a ConstraintDescription after it’s constraint has been created.")
|
||
}
|
||
}
|
||
}
|
||
private var relation: ConstraintRelation? {
|
||
willSet {
|
||
if self.concreteConstraint != nil {
|
||
fatalError("Attempting to modify a ConstraintDescription after it’s constraint has been created.")
|
||
}
|
||
}
|
||
}
|
||
private var constant: Any = Float(0.0) {
|
||
willSet {
|
||
if self.concreteConstraint != nil {
|
||
fatalError("Attempting to modify a ConstraintDescription after it’s constraint has been created.")
|
||
}
|
||
}
|
||
}
|
||
private var multiplier: Float = 1.0 {
|
||
willSet {
|
||
if self.concreteConstraint != nil {
|
||
fatalError("Attempting to modify a ConstraintDescription after it’s constraint has been created.")
|
||
}
|
||
}
|
||
}
|
||
private var priority: Float = 1000.0 {
|
||
willSet {
|
||
if self.concreteConstraint != nil {
|
||
fatalError("Attempting to modify a ConstraintDescription after it’s constraint has been created.")
|
||
}
|
||
}
|
||
}
|
||
private var concreteConstraint: ConcreteConstraint? = nil
|
||
|
||
private func addConstraint(attributes: ConstraintAttributes) -> ConstraintDescription {
|
||
if self.relation == nil {
|
||
self.fromItem.attributes += attributes
|
||
}
|
||
return self
|
||
}
|
||
|
||
private func constrainTo(other: ConstraintItem, relation: ConstraintRelation) -> ConstraintDescription {
|
||
if other.attributes != ConstraintAttributes.None {
|
||
let toLayoutAttributes = other.attributes.layoutAttributes
|
||
if toLayoutAttributes.count > 1 {
|
||
let fromLayoutAttributes = self.fromItem.attributes.layoutAttributes
|
||
if toLayoutAttributes != fromLayoutAttributes {
|
||
NSException(name: "Invalid Constraint", reason: "Cannot constrain to multiple non identical attributes", userInfo: nil).raise()
|
||
return self
|
||
}
|
||
other.attributes = ConstraintAttributes.None
|
||
}
|
||
}
|
||
self.toItem = other
|
||
self.relation = relation
|
||
return self
|
||
}
|
||
|
||
private func constrainTo(other: View, relation: ConstraintRelation) -> ConstraintDescription {
|
||
return constrainTo(ConstraintItem(object: other, attributes: ConstraintAttributes.None), relation: relation)
|
||
}
|
||
|
||
#if os(iOS)
|
||
|
||
private func constrainTo(other: UILayoutSupport, relation: ConstraintRelation) -> ConstraintDescription {
|
||
return constrainTo(ConstraintItem(object: other, attributes: ConstraintAttributes.None), relation: relation)
|
||
}
|
||
|
||
#endif
|
||
|
||
private func constrainTo(other: Float, relation: ConstraintRelation) -> ConstraintDescription {
|
||
self.constant = other
|
||
return constrainTo(ConstraintItem(object: nil, attributes: ConstraintAttributes.None), relation: relation)
|
||
}
|
||
|
||
private func constrainTo(other: Double, relation: ConstraintRelation) -> ConstraintDescription {
|
||
self.constant = other
|
||
return constrainTo(ConstraintItem(object: nil, attributes: ConstraintAttributes.None), relation: relation)
|
||
}
|
||
|
||
private func constrainTo(other: CGSize, relation: ConstraintRelation) -> ConstraintDescription {
|
||
self.constant = other
|
||
return constrainTo(ConstraintItem(object: nil, attributes: ConstraintAttributes.None), relation: relation)
|
||
}
|
||
|
||
private func constrainTo(other: CGPoint, relation: ConstraintRelation) -> ConstraintDescription {
|
||
self.constant = other
|
||
return constrainTo(ConstraintItem(object: nil, attributes: ConstraintAttributes.None), relation: relation)
|
||
}
|
||
|
||
private func constrainTo(other: EdgeInsets, relation: ConstraintRelation) -> ConstraintDescription {
|
||
self.constant = other
|
||
return constrainTo(ConstraintItem(object: nil, attributes: ConstraintAttributes.None), relation: relation)
|
||
}
|
||
} |