mirror of https://github.com/SnapKit/SnapKit
505 lines
21 KiB
Swift
505 lines
21 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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/**
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Used to expose API's for a Constraint
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*/
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public class Constraint {
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public func install() -> [LayoutConstraint] { fatalError("Must be implemented by Concrete subclass.") }
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public func uninstall() -> Void { fatalError("Must be implemented by Concrete subclass.") }
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public func activate() -> Void { fatalError("Must be implemented by Concrete subclass.") }
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public func deactivate() -> Void { fatalError("Must be implemented by Concrete subclass.") }
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public func updateOffset(amount: Float) -> Void { fatalError("Must be implemented by Concrete subclass.") }
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public func updateOffset(amount: Double) -> Void { fatalError("Must be implemented by Concrete subclass.") }
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public func updateOffset(amount: CGFloat) -> Void { fatalError("Must be implemented by Concrete subclass.") }
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public func updateOffset(amount: Int) -> Void { fatalError("Must be implemented by Concrete subclass.") }
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public func updateOffset(amount: UInt) -> Void { fatalError("Must be implemented by Concrete subclass.") }
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public func updateOffset(amount: CGPoint) -> Void { fatalError("Must be implemented by Concrete subclass.") }
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public func updateOffset(amount: CGSize) -> Void { fatalError("Must be implemented by Concrete subclass.") }
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public func updateOffset(amount: EdgeInsets) -> Void { fatalError("Must be implemented by Concrete subclass.") }
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public func updateInsets(amount: EdgeInsets) -> Void { fatalError("Must be implemented by Concrete subclass.") }
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public func updatePriority(priority: Float) -> Void { fatalError("Must be implemented by Concrete subclass.") }
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public func updatePriority(priority: Double) -> Void { fatalError("Must be implemented by Concrete subclass.") }
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public func updatePriority(priority: CGFloat) -> Void { fatalError("Must be implemented by Concrete subclass.") }
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public func updatePriority(priority: UInt) -> Void { fatalError("Must be implemented by Concrete subclass.") }
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public func updatePriority(priority: Int) -> Void { fatalError("Must be implemented by Concrete subclass.") }
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public func updatePriorityRequired() -> Void { fatalError("Must be implemented by Concrete subclass.") }
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public func updatePriorityHigh() -> Void { fatalError("Must be implemented by Concrete subclass.") }
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public func updatePriorityMedium() -> Void { fatalError("Must be implemented by Concrete subclass.") }
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public func updatePriorityLow() -> Void { fatalError("Must be implemented by Concrete subclass.") }
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internal var makerFile: String = "Unknown"
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internal var makerLine: UInt = 0
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}
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/**
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Used internally to implement a ConcreteConstraint
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*/
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internal class ConcreteConstraint: Constraint {
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internal override func updateOffset(amount: Float) -> Void {
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self.constant = amount
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}
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internal override func updateOffset(amount: Double) -> Void {
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self.updateOffset(Float(amount))
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}
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internal override func updateOffset(amount: CGFloat) -> Void {
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self.updateOffset(Float(amount))
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}
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internal override func updateOffset(amount: Int) -> Void {
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self.updateOffset(Float(amount))
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}
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internal override func updateOffset(amount: UInt) -> Void {
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self.updateOffset(Float(amount))
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}
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internal override func updateOffset(amount: CGPoint) -> Void {
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self.constant = amount
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}
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internal override func updateOffset(amount: CGSize) -> Void {
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self.constant = amount
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}
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internal override func updateOffset(amount: EdgeInsets) -> Void {
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self.constant = amount
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}
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internal override func updateInsets(amount: EdgeInsets) -> Void {
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self.constant = EdgeInsets(top: amount.top, left: amount.left, bottom: -amount.bottom, right: -amount.right)
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}
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internal override func updatePriority(priority: Float) -> Void {
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self.priority = priority
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}
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internal override func updatePriority(priority: Double) -> Void {
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self.updatePriority(Float(priority))
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}
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internal override func updatePriority(priority: CGFloat) -> Void {
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self.updatePriority(Float(priority))
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}
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internal override func updatePriority(priority: UInt) -> Void {
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self.updatePriority(Float(priority))
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}
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internal override func updatePriority(priority: Int) -> Void {
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self.updatePriority(Float(priority))
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}
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internal override func updatePriorityRequired() -> Void {
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self.updatePriority(Float(1000.0))
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}
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internal override func updatePriorityHigh() -> Void {
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self.updatePriority(Float(750.0))
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}
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internal override func updatePriorityMedium() -> Void {
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#if os(iOS) || os(tvOS)
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self.updatePriority(Float(500.0))
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#else
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self.updatePriority(Float(501.0))
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#endif
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}
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internal override func updatePriorityLow() -> Void {
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self.updatePriority(Float(250.0))
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}
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internal override func install() -> [LayoutConstraint] {
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return self.installOnView(updateExisting: false, file: self.makerFile, line: self.makerLine)
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}
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internal override func uninstall() -> Void {
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self.uninstallFromView()
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}
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internal override func activate() -> Void {
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guard self.installInfo != nil else {
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self.install()
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return
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}
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#if SNAPKIT_DEPLOYMENT_LEGACY
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guard #available(iOS 8.0, OSX 10.10, *) else {
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self.install()
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return
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}
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#endif
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let layoutConstraints = self.installInfo!.layoutConstraints.allObjects as! [LayoutConstraint]
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if layoutConstraints.count > 0 {
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NSLayoutConstraint.activateConstraints(layoutConstraints)
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}
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}
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internal override func deactivate() -> Void {
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guard self.installInfo != nil else {
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return
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}
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#if SNAPKIT_DEPLOYMENT_LEGACY
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guard #available(iOS 8.0, OSX 10.10, *) else {
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return
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}
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#endif
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let layoutConstraints = self.installInfo!.layoutConstraints.allObjects as! [LayoutConstraint]
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if layoutConstraints.count > 0 {
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NSLayoutConstraint.deactivateConstraints(layoutConstraints)
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}
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}
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private let fromItem: ConstraintItem
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private let toItem: ConstraintItem
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private let relation: ConstraintRelation
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private let multiplier: Float
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private var constant: Any {
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didSet {
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if let installInfo = self.installInfo {
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for layoutConstraint in installInfo.layoutConstraints.allObjects as! [LayoutConstraint] {
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let attribute = (layoutConstraint.secondAttribute == .NotAnAttribute) ? layoutConstraint.firstAttribute : layoutConstraint.secondAttribute
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layoutConstraint.constant = attribute.snp_constantForValue(self.constant)
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}
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}
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}
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}
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private var priority: Float {
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didSet {
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if let installInfo = self.installInfo {
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for layoutConstraint in installInfo.layoutConstraints.allObjects as! [LayoutConstraint] {
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layoutConstraint.priority = self.priority
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}
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}
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}
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}
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private let label: String?
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private var installInfo: ConcreteConstraintInstallInfo? = nil
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internal init(fromItem: ConstraintItem, toItem: ConstraintItem, relation: ConstraintRelation, constant: Any, multiplier: Float, priority: Float, label: String? = nil) {
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self.fromItem = fromItem
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self.toItem = toItem
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self.relation = relation
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self.constant = constant
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self.multiplier = multiplier
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self.priority = priority
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self.label = label
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}
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internal func installOnView(updateExisting updateExisting: Bool = false, file: String? = nil, line: UInt? = nil) -> [LayoutConstraint] {
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var installOnView: View? = nil
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if self.toItem.view != nil {
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installOnView = closestCommonSuperviewFromView(self.fromItem.view, toView: self.toItem.view)
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if installOnView == nil {
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NSException(name: "Cannot Install Constraint", reason: "No common superview between views (@\(self.makerFile)#\(self.makerLine))", userInfo: nil).raise()
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return []
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}
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} else {
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if self.fromItem.attributes.isSubsetOf(ConstraintAttributes.Width.union(.Height)) {
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installOnView = self.fromItem.view
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} else {
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installOnView = self.fromItem.view?.superview
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if installOnView == nil {
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NSException(name: "Cannot Install Constraint", reason: "Missing superview (@\(self.makerFile)#\(self.makerLine))", userInfo: nil).raise()
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return []
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}
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}
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}
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if let installedOnView = self.installInfo?.view {
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if installedOnView != installOnView {
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NSException(name: "Cannot Install Constraint", reason: "Already installed on different view. (@\(self.makerFile)#\(self.makerLine))", userInfo: nil).raise()
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return []
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}
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return self.installInfo?.layoutConstraints.allObjects as? [LayoutConstraint] ?? []
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}
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var newLayoutConstraints = [LayoutConstraint]()
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let layoutFromAttributes = self.fromItem.attributes.layoutAttributes
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let layoutToAttributes = self.toItem.attributes.layoutAttributes
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// get layout from
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let layoutFrom: View? = self.fromItem.view
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// get layout relation
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let layoutRelation: NSLayoutRelation = self.relation.layoutRelation
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for layoutFromAttribute in layoutFromAttributes {
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// get layout to attribute
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let layoutToAttribute = (layoutToAttributes.count > 0) ? layoutToAttributes[0] : layoutFromAttribute
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// get layout constant
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let layoutConstant: CGFloat = layoutToAttribute.snp_constantForValue(self.constant)
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// get layout to
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#if os(iOS) || os(tvOS)
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var layoutTo: AnyObject? = self.toItem.view ?? self.toItem.layoutSupport
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#else
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var layoutTo: AnyObject? = self.toItem.view
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#endif
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if layoutTo == nil && layoutToAttribute != .Width && layoutToAttribute != .Height {
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layoutTo = installOnView
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}
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// create layout constraint
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let layoutConstraint = LayoutConstraint(
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item: layoutFrom!,
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attribute: layoutFromAttribute,
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relatedBy: layoutRelation,
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toItem: layoutTo,
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attribute: layoutToAttribute,
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multiplier: CGFloat(self.multiplier),
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constant: layoutConstant)
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layoutConstraint.identifier = self.label
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// set priority
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layoutConstraint.priority = self.priority
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// set constraint
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layoutConstraint.snp_constraint = self
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newLayoutConstraints.append(layoutConstraint)
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}
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// special logic for updating
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if updateExisting {
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// get existing constraints for this view
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let existingLayoutConstraints = layoutFrom!.snp_installedLayoutConstraints.reverse()
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// array that will contain only new layout constraints to keep
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var newLayoutConstraintsToKeep = [LayoutConstraint]()
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// begin looping
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for layoutConstraint in newLayoutConstraints {
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// layout constraint that should be updated
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var updateLayoutConstraint: LayoutConstraint? = nil
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// loop through existing and check for match
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for existingLayoutConstraint in existingLayoutConstraints {
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if existingLayoutConstraint == layoutConstraint {
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updateLayoutConstraint = existingLayoutConstraint
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break
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}
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}
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// if we have existing one lets just update the constant
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if updateLayoutConstraint != nil {
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updateLayoutConstraint!.constant = layoutConstraint.constant
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}
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// otherwise add this layout constraint to new keep list
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else {
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newLayoutConstraintsToKeep.append(layoutConstraint)
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}
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}
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// set constraints to only new ones
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newLayoutConstraints = newLayoutConstraintsToKeep
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}
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// add constraints
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#if SNAPKIT_DEPLOYMENT_LEGACY && !os(OSX)
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if #available(iOS 8.0, *) {
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NSLayoutConstraint.activateConstraints(newLayoutConstraints)
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} else {
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installOnView!.addConstraints(newLayoutConstraints)
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}
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#else
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NSLayoutConstraint.activateConstraints(newLayoutConstraints)
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#endif
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// set install info
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self.installInfo = ConcreteConstraintInstallInfo(view: installOnView, layoutConstraints: NSHashTable.weakObjectsHashTable())
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// store which layout constraints are installed for this constraint
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for layoutConstraint in newLayoutConstraints {
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self.installInfo!.layoutConstraints.addObject(layoutConstraint)
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}
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// store the layout constraints against the layout from view
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layoutFrom!.snp_installedLayoutConstraints += newLayoutConstraints
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// return the new constraints
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return newLayoutConstraints
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}
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internal func uninstallFromView() {
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if let installInfo = self.installInfo,
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let installedLayoutConstraints = installInfo.layoutConstraints.allObjects as? [LayoutConstraint] {
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if installedLayoutConstraints.count > 0 {
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// remove the constraints from the UIView's storage
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#if SNAPKIT_DEPLOYMENT_LEGACY && !os(OSX)
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if #available(iOS 8.0, *) {
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NSLayoutConstraint.deactivateConstraints(installedLayoutConstraints)
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} else if let installedOnView = installInfo.view {
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installedOnView.removeConstraints(installedLayoutConstraints)
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}
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#else
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NSLayoutConstraint.deactivateConstraints(installedLayoutConstraints)
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#endif
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// remove the constraints from the from item view
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if let fromView = self.fromItem.view {
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fromView.snp_installedLayoutConstraints = fromView.snp_installedLayoutConstraints.filter {
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return !installedLayoutConstraints.contains($0)
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}
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}
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}
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}
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self.installInfo = nil
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}
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}
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private struct ConcreteConstraintInstallInfo {
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weak var view: View? = nil
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let layoutConstraints: NSHashTable
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}
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private extension NSLayoutAttribute {
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private func snp_constantForValue(value: Any?) -> CGFloat {
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// Float
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if let float = value as? Float {
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return CGFloat(float)
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}
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// Double
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else if let double = value as? Double {
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return CGFloat(double)
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}
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// UInt
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else if let int = value as? Int {
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return CGFloat(int)
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}
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// Int
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else if let uint = value as? UInt {
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return CGFloat(uint)
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}
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// CGFloat
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else if let float = value as? CGFloat {
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return float
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}
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// CGSize
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else if let size = value as? CGSize {
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if self == .Width {
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return size.width
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} else if self == .Height {
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return size.height
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}
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}
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// CGPoint
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else if let point = value as? CGPoint {
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#if os(iOS) || os(tvOS)
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switch self {
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case .Left, .CenterX, .LeftMargin, .CenterXWithinMargins: return point.x
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case .Top, .CenterY, .TopMargin, .CenterYWithinMargins, .LastBaseline, .FirstBaseline: return point.y
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case .Right, .RightMargin: return point.x
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case .Bottom, .BottomMargin: return point.y
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case .Leading, .LeadingMargin: return point.x
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case .Trailing, .TrailingMargin: return point.x
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case .Width, .Height, .NotAnAttribute: return CGFloat(0)
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}
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#else
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switch self {
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case .Left, .CenterX: return point.x
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case .Top, .CenterY, .LastBaseline: return point.y
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case .Right: return point.x
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case .Bottom: return point.y
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case .Leading: return point.x
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case .Trailing: return point.x
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case .Width, .Height, .NotAnAttribute: return CGFloat(0)
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case .FirstBaseline: return point.y
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}
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#endif
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}
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// EdgeInsets
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else if let insets = value as? EdgeInsets {
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#if os(iOS) || os(tvOS)
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switch self {
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case .Left, .CenterX, .LeftMargin, .CenterXWithinMargins: return insets.left
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case .Top, .CenterY, .TopMargin, .CenterYWithinMargins, .LastBaseline, .FirstBaseline: return insets.top
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case .Right, .RightMargin: return insets.right
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case .Bottom, .BottomMargin: return insets.bottom
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case .Leading, .LeadingMargin: return (Config.interfaceLayoutDirection == .LeftToRight) ? insets.left : -insets.right
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case .Trailing, .TrailingMargin: return (Config.interfaceLayoutDirection == .LeftToRight) ? insets.right : -insets.left
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case .Width: return -insets.left + insets.right
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case .Height: return -insets.top + insets.bottom
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case .NotAnAttribute: return CGFloat(0)
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}
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#else
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switch self {
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case .Left, .CenterX: return insets.left
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case .Top, .CenterY, .LastBaseline: return insets.top
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case .Right: return insets.right
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case .Bottom: return insets.bottom
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case .Leading: return (Config.interfaceLayoutDirection == .LeftToRight) ? insets.left : -insets.right
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case .Trailing: return (Config.interfaceLayoutDirection == .LeftToRight) ? insets.right : -insets.left
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case .Width: return -insets.left + insets.right
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case .Height: return -insets.top + insets.bottom
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case .NotAnAttribute: return CGFloat(0)
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case .FirstBaseline: return insets.bottom
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}
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#endif
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}
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return CGFloat(0);
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}
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}
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private func closestCommonSuperviewFromView(fromView: View?, toView: View?) -> View? {
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var views = Set<View>()
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var fromView = fromView
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var toView = toView
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repeat {
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if let view = toView {
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if views.contains(view) {
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return view
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}
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views.insert(view)
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toView = view.superview
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}
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if let view = fromView {
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if views.contains(view) {
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return view
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}
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views.insert(view)
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fromView = view.superview
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}
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} while (fromView != nil || toView != nil)
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return nil
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}
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private func ==(left: ConcreteConstraint, right: ConcreteConstraint) -> Bool {
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return (left.fromItem == right.fromItem &&
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left.toItem == right.toItem &&
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left.relation == right.relation &&
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left.multiplier == right.multiplier &&
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left.priority == right.priority)
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}
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