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@@ -28,10 +28,10 @@
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#endif
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public final class Constraint {
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-
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+
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internal let sourceLocation: (String, UInt)
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internal let label: String?
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-
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+
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private let from: ConstraintItem
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private let to: ConstraintItem
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private let relation: ConstraintRelation
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@@ -46,10 +46,19 @@ public final class Constraint {
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self.updateConstantAndPriorityIfNeeded()
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}
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}
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- private var layoutConstraints: [LayoutConstraint]
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+ public var layoutConstraints: [LayoutConstraint]
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- // MARK: Initialization
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+ public var isActive: Bool {
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+ for layoutConstraint in self.layoutConstraints {
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+ if layoutConstraint.isActive {
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+ return true
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+ }
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+ }
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+ return false
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+ }
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+ // MARK: Initialization
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+
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internal init(from: ConstraintItem,
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to: ConstraintItem,
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relation: ConstraintRelation,
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@@ -67,17 +76,17 @@ public final class Constraint {
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self.constant = constant
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self.priority = priority
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self.layoutConstraints = []
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-
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+
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// get attributes
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let layoutFromAttributes = self.from.attributes.layoutAttributes
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let layoutToAttributes = self.to.attributes.layoutAttributes
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-
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+
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// get layout from
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let layoutFrom = self.from.layoutConstraintItem!
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-
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+
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// get relation
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let layoutRelation = self.relation.layoutRelation
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-
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+
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for layoutFromAttribute in layoutFromAttributes {
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// get layout to attribute
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let layoutToAttribute: NSLayoutAttribute
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@@ -130,18 +139,18 @@ public final class Constraint {
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layoutToAttribute = layoutFromAttribute
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}
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#endif
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-
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+
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// get layout constant
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let layoutConstant: CGFloat = self.constant.constraintConstantTargetValueFor(layoutAttribute: layoutToAttribute)
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-
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+
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// get layout to
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var layoutTo: AnyObject? = self.to.target
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-
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+
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// use superview if possible
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if layoutTo == nil && layoutToAttribute != .width && layoutToAttribute != .height {
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layoutTo = layoutFrom.superview
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}
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-
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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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@@ -152,119 +161,113 @@ public final class Constraint {
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multiplier: self.multiplier.constraintMultiplierTargetValue,
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constant: layoutConstant
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)
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-
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+
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// set label
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layoutConstraint.label = self.label
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-
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+
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// set priority
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layoutConstraint.priority = self.priority.constraintPriorityTargetValue
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-
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+
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// set constraint
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layoutConstraint.constraint = self
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-
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+
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// append
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self.layoutConstraints.append(layoutConstraint)
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}
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}
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-
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+
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// MARK: Public
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-
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+
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@available(*, deprecated:3.0, message:"Use activate().")
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public func install() {
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self.activate()
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}
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-
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+
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@available(*, deprecated:3.0, message:"Use deactivate().")
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public func uninstall() {
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self.deactivate()
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}
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-
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+
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public func activate() {
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self.activateIfNeeded()
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}
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-
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+
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public func deactivate() {
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self.deactivateIfNeeded()
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}
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-
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+
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@discardableResult
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public func update(offset: ConstraintOffsetTarget) -> Constraint {
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self.constant = offset.constraintOffsetTargetValue
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return self
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}
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-
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+
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@discardableResult
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public func update(inset: ConstraintInsetTarget) -> Constraint {
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self.constant = inset.constraintInsetTargetValue
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return self
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}
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-
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+
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@discardableResult
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public func update(priority: ConstraintPriorityTarget) -> Constraint {
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self.priority = priority.constraintPriorityTargetValue
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return self
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}
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-
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+
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@available(*, deprecated:3.0, message:"Use update(offset: ConstraintOffsetTarget) instead.")
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public func updateOffset(amount: ConstraintOffsetTarget) -> Void { self.update(offset: amount) }
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-
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+
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@available(*, deprecated:3.0, message:"Use update(inset: ConstraintInsetTarget) instead.")
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public func updateInsets(amount: ConstraintInsetTarget) -> Void { self.update(inset: amount) }
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-
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+
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@available(*, deprecated:3.0, message:"Use update(priority: ConstraintPriorityTarget) instead.")
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public func updatePriority(amount: ConstraintPriorityTarget) -> Void { self.update(priority: amount) }
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-
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+
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@available(*, obsoleted:3.0, message:"Use update(priority: ConstraintPriorityTarget) instead.")
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public func updatePriorityRequired() -> Void {}
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-
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+
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@available(*, obsoleted:3.0, message:"Use update(priority: ConstraintPriorityTarget) instead.")
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public func updatePriorityHigh() -> Void { fatalError("Must be implemented by Concrete subclass.") }
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-
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+
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@available(*, obsoleted:3.0, message:"Use update(priority: ConstraintPriorityTarget) instead.")
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public func updatePriorityMedium() -> Void { fatalError("Must be implemented by Concrete subclass.") }
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-
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+
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@available(*, obsoleted:3.0, message:"Use update(priority: ConstraintPriorityTarget) instead.")
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public func updatePriorityLow() -> Void { fatalError("Must be implemented by Concrete subclass.") }
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-
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+
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// MARK: Internal
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-
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+
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internal func updateConstantAndPriorityIfNeeded() {
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for layoutConstraint in self.layoutConstraints {
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let attribute = (layoutConstraint.secondAttribute == .notAnAttribute) ? layoutConstraint.firstAttribute : layoutConstraint.secondAttribute
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layoutConstraint.constant = self.constant.constraintConstantTargetValueFor(layoutAttribute: attribute)
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-
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- #if os(iOS) || os(tvOS)
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- let requiredPriority: UILayoutPriority = UILayoutPriorityRequired
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- #else
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- let requiredPriority: Float = 1000.0
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- #endif
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-
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-
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+
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+ let requiredPriority = ConstraintPriority.required.value
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if (layoutConstraint.priority < requiredPriority), (self.priority.constraintPriorityTargetValue != requiredPriority) {
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layoutConstraint.priority = self.priority.constraintPriorityTargetValue
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}
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}
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}
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-
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+
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internal func activateIfNeeded(updatingExisting: Bool = false) {
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guard let item = self.from.layoutConstraintItem else {
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print("WARNING: SnapKit failed to get from item from constraint. Activate will be a no-op.")
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return
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}
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let layoutConstraints = self.layoutConstraints
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-
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+
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if updatingExisting {
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var existingLayoutConstraints: [LayoutConstraint] = []
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for constraint in item.constraints {
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existingLayoutConstraints += constraint.layoutConstraints
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}
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-
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+
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for layoutConstraint in layoutConstraints {
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let existingLayoutConstraint = existingLayoutConstraints.first { $0 == layoutConstraint }
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guard let updateLayoutConstraint = existingLayoutConstraint else {
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fatalError("Updated constraint could not find existing matching constraint to update: \(layoutConstraint)")
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}
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-
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+
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let updateLayoutAttribute = (updateLayoutConstraint.secondAttribute == .notAnAttribute) ? updateLayoutConstraint.firstAttribute : updateLayoutConstraint.secondAttribute
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updateLayoutConstraint.constant = self.constant.constraintConstantTargetValueFor(layoutAttribute: updateLayoutAttribute)
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}
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@@ -273,7 +276,7 @@ public final class Constraint {
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item.add(constraints: [self])
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}
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}
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-
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+
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internal func deactivateIfNeeded() {
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guard let item = self.from.layoutConstraintItem else {
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print("WARNING: SnapKit failed to get from item from constraint. Deactivate will be a no-op.")
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Robert Payne