Class: DisplayMgr

Inherits:
Object
  • Object
show all
Defined in:
app/display.rb

Overview

Manage a list of display expressions.

Instance Method Summary collapse

Constructor Details

#initialize ⇒ DisplayMgr

Returns a new instance of DisplayMgr.



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# File 'app/display.rb', line 16

def initialize
  @next = 0
  @list = []
end

Instance Method Details

#[](index) ⇒ Object

Raises:

  • (TypeError) 


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# File 'app/display.rb', line 21

def [](index)
  raise TypeError, 
  "index #{index} should be a Fixnum, is #{index.class}" unless
    index.is_a?(Fixnum)
  @list.detect {|disp| disp.number == index }
end

#add(frame, arg, fmt = nil) ⇒ Object 



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# File 'app/display.rb', line 28

def add(frame, arg, fmt=nil)
  return nil unless frame
  begin
    eval(arg, frame.binding)
  rescue
    return nil
  end
  @next += 1
  d = Display.new(frame, arg, fmt, @next)
  @list << d
  d
end

#all ⇒ Object

List all display items; return 0 if none



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# File 'app/display.rb', line 42

def all
  s = []
  unless @list.empty?
    s << "Auto-display expressions now in effect:
Num Enb Expression"
    @list.each do |display|
      s << display.format
    end
  end
  s
end

#clear ⇒ Object

Delete all display expressions“”“



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# File 'app/display.rb', line 55

def clear
  @list = []
end

#delete_index(display_number) ⇒ Object

Delete display expression i



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# File 'app/display.rb', line 60

def delete_index(display_number)
  @list.each_with_index do |display, i|
    if display_number == display.number
      @list[i..i] = []
      return true
    end
  end
  false
end

#display(frame) ⇒ Object

display any items that are active”‘



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# File 'app/display.rb', line 71

def display(frame)
  return unless frame
  s = []
  sig = display_signature(frame)
  @list.each do |display|
    if display.enabled # && display.signature == sig
      s << display.to_s(frame)
    end
  end
  return s
end

#enable_disable(display_number, b_enable_disable) ⇒ Object 



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# File 'app/display.rb', line 83

def enable_disable(display_number, b_enable_disable)
  @list.each do |display|
    if display_number == display.number
      display.enabled = b_enable_disable
      return true
    end
  end
  false
end

#max ⇒ Object 



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# File 'app/display.rb', line 93

def max
  @list.map{|disp| disp.number}.max
end

#nums ⇒ Object 



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# File 'app/display.rb', line 97

def nums
  @list.map{|disp| disp.number}
end

#size ⇒ Object 



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# File 'app/display.rb', line 101

def size
  @list.size
end