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inexpensive web hosting company inexpensive web hosting company At some point we'll be working on the code that handles the user interface---the buttons that people press to select songs and control the jukebox. We'll need to associate actions with those buttons: press STOP and the music stops. It turns out that Ruby's blocks are a convenient way to do this. Let's start out by assuming that the people who made the hardware implemented a Ruby extension that gives us a basic button class. (We talk about extending Ruby beginning on page 169.

inexpensive web hosting company ) bStart = Button.new("Start") bPause = Button.new("Pause") # ...

inexpensive web hosting company 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...

inexpensive web hosting company 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. 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.

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