svn/view/modeline.rb


require "modeline_element.rb"

module Edmaru
  
  module ModeLine

    #Construct the modeline instance.
    #
    #=== Warning
    #This method *MUST* *NOT* be overrided in derived classes.
    #
    #=== Return
    #An initialized instance of ModeLine.
    def initialize
      @elements = Hash.new
      init_ui
    end

    #The system specific initialization for ModeLine.
    #
    #=== Warning
    #This method *SHOULD* be overrided in derived classes.
    def init_ui
    end

    #Add the specified _element_, an instance of ModeLineElement, to
    #this ModeLine.
    #
    #=== Argument
    #_element_ :: an instance of ModeLineElement to be added.
    #
    #=== Warning
    #This method *MUST* *NOT* be overrided in derived classes.
    #
    #=== Return
    #_true_ if the addition is succeeded.
    #_false_ if the _element_'s name has already reserved.
    def add_element(element)
      if @elements.include?(element.name)
        return false
      end

      @elements[element.name] = element
    end

    #Show the specified element.
    #
    #=== Argument
    #_name_ :: the name of the element.
    #
    #=== Warning
    #This method *MUST* *NOT* be overrided in derived classes.
    def show_element(name)
      if !@elements.include?(name) || @elements[name].visible
        return
      end

      @elements[name].visible = true

      #ToDo: refresh
    end


    #Hide the specified element.
    #
    #=== Argument
    #_name_ :: the name of the element.
    #
    #=== Warning
    #This method *MUST* *NOT* be overrided in derived classes.
    def hide_element(name)
      if !@elements.include?(name) || !@elements[name].visible       
        return
      end

      @elements[name].visible = false

      #ToDo: refresh
    end

    #Get the specified element.
    #
    #=== Warning
    #This method *MUST* *NOT* be overrided in derived classes.
    #
    #=== Argument
    #_name_ :: the name of the element.
    #
    #=== Return
    #An instance of ModeLineElement whose name is the specified name
    #or _nil_ if the specified name is not registered.
    def get_element(name)
      if !@elements.include?(name)
        return nil
      end

      @elements[name]
    end

    #Terminate this modeline instance.
    #
    #=== Warning
    #This method *SHOULD* be overrided in derived classes.
    def terminate
    end
  end
end