Class: MotionKit::ConstraintsTarget

Inherits:
Object
  • Object
show all
Defined in:
lib/motion-kit-cocoa/constraints/constraints_target.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(view) ⇒ ConstraintsTarget

Returns a new instance of ConstraintsTarget.



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# File 'lib/motion-kit-cocoa/constraints/constraints_target.rb', line 6

def initialize(view)
  @view = view
  @constraints = []
end

Instance Attribute Details

#view ⇒ Object (readonly)

Returns the value of attribute view.



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# File 'lib/motion-kit-cocoa/constraints/constraints_target.rb', line 4

def view
  @view
end

Instance Method Details

#add_constraints(constraints) ⇒ Object 



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# File 'lib/motion-kit-cocoa/constraints/constraints_target.rb', line 11

def add_constraints(constraints)
  @constraints.concat(constraints)
end

#apply_all_constraints(layout, target) ⇒ Object 



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# File 'lib/motion-kit-cocoa/constraints/constraints_target.rb', line 15

def apply_all_constraints(layout, target)
  @constraints.map do |mk_constraint|
    mk_constraint.resolve_all(layout, target).map do |constraint|
      base_view_class = MotionKit.base_view_class

      if constraint.firstItem.is_a?(base_view_class) && constraint.secondItem.is_a?(base_view_class)
        common_ancestor = nil

        ancestors = [constraint.firstItem]
        parent_view = constraint.firstItem
        while parent_view = parent_view.superview
          ancestors << parent_view
        end

        current_view = constraint.secondItem
        while current_view
          if ancestors.include? current_view
            common_ancestor = current_view
            break
          end
          current_view = current_view.superview
        end

        unless common_ancestor
          raise NoCommonAncestorError.new("No common ancestors between #{constraint.firstItem} and #{constraint.secondItem}")
        end
      else
        common_ancestor = constraint.firstItem
      end

      common_ancestor.addConstraint(constraint)
      constraint
    end
  end.flatten
end