Class: CDK::SCROLLER

Inherits:
CDKOBJS show all
Defined in:
lib/cdk/scroller.rb

Direct Known Subclasses

RADIO, SCROLL, SELECTION

Instance Attribute Summary

Attributes inherited from CDKOBJS

#BXAttr, #HZChar, #LLChar, #LRChar, #ULChar, #URChar, #VTChar, #accepts_focus, #binding_list, #border_size, #box, #exit_type, #has_focus, #is_visible, #screen, #screen_index

Instance Method Summary collapse

Methods inherited from CDKOBJS

#SCREEN_XPOS, #SCREEN_YPOS, #bind, #bindableObject, #checkBind, #cleanBindings, #cleanTitle, #destroy, #draw, #drawTitle, #erase, #focus, #getBox, #getc, #getch, #inject, #isBind, #move, #move_specific, #object_type, #position, #refreshData, #saveData, #setBXattr, #setBackgroundColor, #setBox, #setExitType, #setHZchar, #setLLchar, #setLRchar, #setPostProcess, #setPreProcess, #setTitle, #setULchar, #setURchar, #setVTchar, #unbind, #unfocus, #validCDKObject, #validObjType

Constructor Details

#initialize ⇒ SCROLLER

Returns a new instance of SCROLLER.



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# File 'lib/cdk/scroller.rb', line 4

def initialize
  super()
end

Instance Method Details

#getCurrentItem ⇒ Object

Get/Set the current item number of the scroller.



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# File 'lib/cdk/scroller.rb', line 175

def getCurrentItem
  @current_item
end

#KEY_DOWN ⇒ Object 



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# File 'lib/cdk/scroller.rb', line 30

def KEY_DOWN
  if @list_size > 0
    if @current_item < @list_size - 1
      if @current_high == @view_size - 1
        if @current_top < @max_top_item
          @current_top += 1
          @current_item += 1
        else
          CDK.Beep
        end
      else
        @current_item += 1
        @current_high += 1
      end
    else
      CDK.Beep
    end
  else
    CDK.Beep
  end
end

#KEY_END ⇒ Object 



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# File 'lib/cdk/scroller.rb', line 118

def KEY_END
  if @max_top_item == -1
    @current_top = 0
    @current_item = @last_item - 1
  else
    @current_top = @max_top_item
    @current_item = @last_item
  end
  @current_high = @view_size - 1
end

#KEY_HOME ⇒ Object 



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# File 'lib/cdk/scroller.rb', line 112

def KEY_HOME
  @current_top = 0
  @current_item = 0
  @current_high = 0
end

#KEY_LEFT ⇒ Object 



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# File 'lib/cdk/scroller.rb', line 52

def KEY_LEFT
  if @list_size > 0
    if @left_char == 0
      CDK.Beep
    else
      @left_char -= 1
    end
  else
    CDK.Beep
  end
end

#KEY_NPAGE ⇒ Object 



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# File 'lib/cdk/scroller.rb', line 93

def KEY_NPAGE
  if @list_size > 0
    if @current_top < @max_top_item
      if @current_top + @view_size - 1 <= @max_top_item
        @current_top += @view_size - 1
        @current_item += @view_size - 1
      else
        @current_top = @max_top_item
        @current_item = @last_item
        @current_high = @view_size - 1
      end
    else
      CDK.Beep
    end
  else
    CDK.Beep
  end
end

#KEY_PPAGE ⇒ Object 



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# File 'lib/cdk/scroller.rb', line 76

def KEY_PPAGE
  if @list_size > 0
    if @current_top > 0
      if @current_top >= @view_size - 1
        @current_top -= @view_size - 1
        @current_item -= @view_size - 1
      else
        self.KEY_HOME
      end
    else
      CDK.Beep
    end
  else
    CDK.Beep
  end
end

#KEY_RIGHT ⇒ Object 



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# File 'lib/cdk/scroller.rb', line 64

def KEY_RIGHT
  if @list_size > 0
    if @left_char >= @max_left_char
      CDK.Beep
    else
      @left_char += 1
    end
  else
    CDK.Beep
  end
end

#KEY_UP ⇒ Object 



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# File 'lib/cdk/scroller.rb', line 8

def KEY_UP
  if @list_size > 0
    if @current_item > 0
      if @current_high == 0
        if @current_top != 0
          @current_top -= 1
          @current_item -= 1
        else
          CDK.Beep
        end
      else
        @current_item -= 1
        @current_high -= 1
      end
    else
      CDK.Beep
    end
  else
    CDK.Beep
  end
end

#maxViewSize ⇒ Object 



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# File 'lib/cdk/scroller.rb', line 129

def maxViewSize
  return @box_height - (2 * @border_size + @title_lines)
end

#setCurrentItem(item) ⇒ Object 



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# File 'lib/cdk/scroller.rb', line 179

def setCurrentItem(item)
  self.setPosition(item);
end

#setPosition(item) ⇒ Object 



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# File 'lib/cdk/scroller.rb', line 157

def setPosition(item)
  if item <= 0
    self.KEY_HOME
  elsif item > @list_size - 1
    @current_top = @max_top_item
    @current_item = @list_size - 1
    @current_high = @view_size - 1
  elsif item >= @current_top && item < @current_top + @view_size
    @current_item = item
    @current_high = item - @current_top
  else
    @current_top = item - (@view_size - 1)
    @current_item = item
    @current_high = @view_size - 1
  end
end

#setViewSize(list_size) ⇒ Object

Set variables that depend upon the list_size



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# File 'lib/cdk/scroller.rb', line 134

def setViewSize(list_size)
  @view_size = self.maxViewSize
  @list_size = list_size
  @last_item = list_size - 1
  @max_top_item = list_size - @view_size

  if list_size < @view_size
    @view_size = list_size
    @max_top_item = 0
  end

  if @list_size > 0 && self.maxViewSize > 0
    @step = 1.0 * self.maxViewSize / @list_size
    @toggle_size = if @list_size > self.maxViewSize
                   then 1
                   else @step.ceil
                   end
  else
    @step = 1
    @toggle_size = 1
  end
end