gistfile1.rb

require 'widgets/slider_widget'

Shoes.app(:title => "slider test", :width => 200, :height => 250) do  
  
  stack do
    slider do |pos|
      @t.text = "pos: #{pos}"
    end
  end 
  stack do
    @t = para "value"
  end
end


# put me in widgets/slider_widget
class Shoes::Slider < Shoes::Widget
  attr_accessor :position
  
  def initialize opts = {}, &blk
    @position = opts[:position] || 0

    @mouse_down = false
    
    @height = 248
    @width = 50

    flow :top => self.top, :left => self.left, :width => 50, :fill => black do
      @back = rect  :top => self.top, 
                    :left => self.left, 
                    :width => 50,
                    :height => 248,
                    :stroke => black,
                    :fill => gray
          
      @button = rect  :top => ( @height - 48 ),
                      :left => self.left + 1,
                      :width => 48,
                      :height => 48,
                      :fill => chocolate
      @back.click do
        button, mouse_x, mouse_y = mouse        
        
        slider_move( mouse_y )
        set_position(mouse_y)
        blk.call(@position)
        
        @mouse_down = true
        
        motion do |x, y|
          if @mouse_down
            slider_move( y )
            set_position( y )
            blk.call(@position)
          end
        end # motion
      end
      
      @back.release do
        @mouse_down = false
      end
      
    end # flow
  end # initialize
  
  def in_bounds?( y )
    ( y >= self.top + 24 ) && ( y <= self.top + @height - 24 )
  end
  
  def slider_move( y )
    slider_x = self.left + 1
    slider_y = y - 24
    @button.move(slider_x, slider_y) if in_bounds?(y)
  end
  
  def set_position( y )
    if y < 24
      @position = 200
    elsif y > self.top + @height - 24
      @position = 0
    elsif
      @position = ( y - 224 ).abs
    end
  end
end