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create your own web page create your own web page . What happens when the user presses one of our buttons? In the Button class, the hardware folks rigged things so that a callback method, buttonPressed, will be invoked. The obvious way of adding functionality to these buttons is to create subclasses of Button and have each subclass implement its own buttonPressed method. class StartButton < Button def initialize super("Start") # invoke Button's initialize end def buttonPressed # do start actions..

create your own web page . end end bStart = StartButton.new There are two problems here. First, this will lead to a large number of subclasses. If the interface to Button changes, this could involve us in a lot of maintenance.

create your own web page Second, the actions performed when a button is pressed are expressed at the wrong level; they are not a feature of the button, but are a feature of the jukebox that uses the buttons. We can fix both of these problems using blocks. class JukeboxButton < Button def initialize(label, &action) super(label) @action = action end def buttonPressed @action.call(self) end end bStart = JukeboxButton.new("Start") { songList.

create your own web page start } bPause = JukeboxButton.new("Pause") { songList.pause } The key to all this is the second parameter to JukeboxButton#initialize. If the last parameter in a method definition is prefixed with an ampersand (such as &action), Ruby looks for a code block whenever that method is called. That code block is converted to an object of class Proc and assigned to the parameter.

create your own web page

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