Module: Wx::KeywordConstructor

Defined in:
lib/wx/keyword_ctors.rb

Defined Under Namespace

Modules: ClassMethods

Class Method Summary collapse

Class Method Details

.included(klass) ⇒ Object 



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# File 'lib/wx/keyword_ctors.rb', line 150

def self.included(klass)
  klass.extend ClassMethods
  klass.module_eval do

    alias :pre_wx_kwctor_init :initialize

    # The new definition of initialize; accepts a parent arg
    # mixed_args, which may zero or more position args, optionally
    # terminated with hash keyword args, and an optional block
    def initialize(parent = :default_ctor, *mixed_args, &block)
      # allow zero-args ctor for use with XRC
      if parent == :default_ctor
        pre_wx_kwctor_init()
        return
      end

      begin
        real_args = [ parent ] + self.class.args_as_list(*mixed_args)
        pre_wx_kwctor_init(*real_args)
      rescue => err
        msg = "Error initializing #{self.inspect}\n"+
              " : #{err.message} \n" +
              "Correct parameters for #{self.class.name}.new are:\n" + 
               self.class.describe_constructor()

        new_err = err.class.new(msg)
        new_err.set_backtrace(caller)
        Kernel.raise new_err
      end

      # If a block was given, pass the newly created Window instance
      # into it; use block
      if block
        if block.arity == -1 or block.arity == 0
          self.instance_eval(&block)
        elsif block.arity == 1
          block.call(self)
        else 
          Kernel.raise ArgumentError, 
                       "Block to initialize accepts zero or one arg"
        end
      end
    end
  end
  
  # Any class inheriting from a class including this module must have
  # its own copy of the param_spec
  def klass.inherited(sub_klass)
    sub_klass.instance_variable_set(:@param_spec, 
                                    instance_variable_get(:@param_spec) )
  end
end