Class: PurplishLayout::ConstraintProxy

Inherits:
Object
  • Object
show all
Defined in:
lib/purplish-layout/purplish-layout.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(view, attribute = nil, multiplier = 1, constant = 0) ⇒ ConstraintProxy

Returns a new instance of ConstraintProxy.



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# File 'lib/purplish-layout/purplish-layout.rb', line 9

def initialize(view, attribute=nil, multiplier=1, constant=0)
  @view = view
  @attribute = attribute
  @multiplier = multiplier
  @constant = constant
end

Instance Attribute Details

#attribute ⇒ Object

Returns the value of attribute attribute.



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# File 'lib/purplish-layout/purplish-layout.rb', line 5

def attribute
  @attribute
end

#constant ⇒ Object

Returns the value of attribute constant.



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# File 'lib/purplish-layout/purplish-layout.rb', line 5

def constant
  @constant
end

#last_constraint ⇒ Object

Returns the value of attribute last_constraint.



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# File 'lib/purplish-layout/purplish-layout.rb', line 6

def last_constraint
  @last_constraint
end

#multiplier ⇒ Object

Returns the value of attribute multiplier.



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# File 'lib/purplish-layout/purplish-layout.rb', line 5

def multiplier
  @multiplier
end

#next_priority ⇒ Object

Returns the value of attribute next_priority.



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# File 'lib/purplish-layout/purplish-layout.rb', line 7

def next_priority
  @next_priority
end

Instance Method Details

#*(aNumber) ⇒ Object 



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# File 'lib/purplish-layout/purplish-layout.rb', line 16

def *(aNumber)
  ConstraintProxy.new(view, attribute, aNumber, constant)
end

#+(aNumber) ⇒ Object 



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# File 'lib/purplish-layout/purplish-layout.rb', line 20

def +(aNumber)
  ConstraintProxy.new(view, attribute, multiplier, aNumber)
end

#-(aNumber) ⇒ Object 



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# File 'lib/purplish-layout/purplish-layout.rb', line 24

def -(aNumber)
  ConstraintProxy.new(view, attribute, multiplier, -aNumber)
end

#<=(rhs) ⇒ Object 



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# File 'lib/purplish-layout/purplish-layout.rb', line 100

def <=(rhs)
  @operator = NSLayoutRelationLessThanOrEqual
  create_constraint_with_rhs(rhs)
  self
end

#>=(rhs) ⇒ Object 



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# File 'lib/purplish-layout/purplish-layout.rb', line 106

def >=(rhs)
  @operator = NSLayoutRelationGreaterThanOrEqual
  create_constraint_with_rhs(rhs)
  self
end

#attr ⇒ Object Also known as: left, right, top, bottom, leading, trailing, width, height, center_x, center_y, baseline

Attributes



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# File 'lib/purplish-layout/purplish-layout.rb', line 87

def attr
  @attribute = __method__
  self
end

#attr=(rhs) ⇒ Object Also known as: left=, right=, top=, bottom=, leading=, trailing=, width=, height=, center_x=, center_y=, baseline= 



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# File 'lib/purplish-layout/purplish-layout.rb', line 92

def attr=(rhs)
  #Derive reader name from writer
  @attribute = __method__[0..-3].to_sym
  @operator = NSLayoutRelationEqual
  self.last_constraint = create_constraint_with_rhs(rhs)
  self
end

#create_constraint_with_rhs(rhs) ⇒ Object 



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# File 'lib/purplish-layout/purplish-layout.rb', line 32

def create_constraint_with_rhs(rhs)
  if rhs.kind_of? self.class
    owner = rhs.view.common_superview(view)
    c = NSLayoutConstraint.constraintWithItem(view, attribute:attribute.to_layout_attribute, relatedBy:@operator, toItem:rhs.view, attribute:rhs.attribute.to_layout_attribute, multiplier:rhs.multiplier, constant:rhs.constant)
    if next_priority
      c.priority = next_priority
      self.next_priority = nil
    end
    #puts "addConstraint: #{c.inspect}"
    owner.addConstraint(c)
    c
  else
    c = NSLayoutConstraint.constraintWithItem(view, attribute:attribute.to_layout_attribute, relatedBy:@operator, toItem:nil, attribute:NSLayoutAttributeNotAnAttribute, multiplier:0, constant:rhs)
    if next_priority
      c.priority = next_priority
      self.next_priority = nil
    end
    #puts "addConstraint: #{c.inspect}"
    view.superview.addConstraint(c)
    c
  end
end

#h(s, metrics = nil, options = 0, views = nil) ⇒ Object 



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# File 'lib/purplish-layout/purplish-layout.rb', line 55

def h(s, metrics=nil, options=0, views=nil)
  if (s.start_with? 'H:') || (s.start_with? 'V:')
    layout(s, metrics, options, views)
  else
    layout("H:#{s}", metrics, options, views)
  end
end

#layout(s, metrics = nil, options = 0, views = nil) ⇒ Object 



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# File 'lib/purplish-layout/purplish-layout.rb', line 71

def layout(s, metrics=nil, options=0, views=nil)
  views ||= views_mapping
  #Workaround, must wrap views with NSDictionary, otherwise doesn't work for RubyMotion
  c = NSLayoutConstraint.constraintsWithVisualFormat(s, options:options, metrics:metrics, views:NSDictionary.dictionaryWithDictionary(views))
  self.last_constraint = c
  if next_priority
    c.each {|e|e.priority = next_priority}
    self.next_priority = nil
  end
  #puts "addConstraints:"
  #c.each {|e| puts "  #{e.inspect}"}
  view.addConstraints(c)
end

#v(s, metrics = nil, options = 0, views = nil) ⇒ Object 



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# File 'lib/purplish-layout/purplish-layout.rb', line 63

def v(s, metrics=nil, options=0, views=nil)
  if (s.start_with? 'H:') || (s.start_with? 'V:')
    layout(s, metrics, options, views)
  else
    layout("V:#{s}", metrics, options, views)
  end
end