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Improve the closest superview finder algorithm

This commit is contained in:
Robert Payne 2015-02-17 11:37:43 +13:00
parent 116002cde7
commit 2701293432
1 changed files with 19 additions and 11 deletions
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30
Snap/Constraint.swift
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@ -506,19 +506,27 @@ public class Constraint {
} }
private class func closestCommonSuperviewFromView(fromView: View?, toView: View?) -> View? { private class func closestCommonSuperviewFromView(fromView: View?, toView: View?) -> View? {
var closestCommonSuperview: View? var views = NSMutableSet()
var secondViewSuperview: View? = toView var fromView = fromView
while closestCommonSuperview == nil && secondViewSuperview != nil { var toView = toView
var firstViewSuperview = fromView do {
while closestCommonSuperview == nil && firstViewSuperview != nil { if let view = toView {
if secondViewSuperview == firstViewSuperview { if views.containsObject(view) {
closestCommonSuperview = secondViewSuperview return view
} }
firstViewSuperview = firstViewSuperview?.superview views.addObject(view)
toView = view.superview
} }
secondViewSuperview = secondViewSuperview?.superview if let view = fromView {
} if views.containsObject(view) {
return closestCommonSuperview return view
}
views.addObject(view)
fromView = view.superview
}
} while (fromView != nil || toView != nil)
return nil
} }
} }