====== ScalaGUI ======

A Scala framework wrapping Swing. 

  * It uses event loops to solve the inversion-of-control problem of Swing's callback events.
  * It uses multiple-inheritance for clean composition of widget properties.
  * It uses Scala's capability for embedding domain-specific-language-like elements to provide an easy layout mechanism based on the new "Matisse" layout library.

An example of a simple application follows. Notice amongst others the following.
  * How the event loops are used for reacting to events.
    * How path-based pattern matching is used to segregate between events from different sources.
    * And how these event loops can be put in any element allowing true separation of concerns.
  * How the window is laid-out, by simply specifying constraints between widgets.

<code scala>
package example

import scala.gui._

object application extends scala.gui.Application {
  
  val mainWindow = new container.Window {
    
    val press = new widget.Button {
      text = "Press me, please"
      subscribe(this)
      toplevel eventloop {
        case this.Click() =>
          field.text = "Wow! Someone pressed me."
      }
    }
    
    val say = new widget.Label {
      text = "I'm here for your information"
      toplevel eventloop {
        case press.Click() =>
          text = "Hey! Button was pressed ;-)"
      }
      subscribe(press)
    }

    val field = new widget.TextField with behaviour.KeyTracker {
      trackingKey = true
      columns = 25
      subscribe(this)
      toplevel eventloop {
        case this.TextChanged() =>
          Console.println("Text changed")
      }
    }

    subscribe(this, press)

    toplevel eventloop {
      case this.Closing() => System.exit(0)
      case press.Click() =>
        Console.println("Oho, the button was pressed.")
    }
    
    lay { new Group {
      object buttonGroup extends Group {
        beside(press, say)
        valign(Alignment.Center)
      }
      above(buttonGroup, field)
    }}
  }
}
</code>

The ''[[http://www.scala-lang.org/docu/papers.html#talks|Tutorial on Writing Modular Programs in Scala]]'' uses ScalaGUI to write a spreadsheet application. The tutorial also demonstrates pattern matching, mixin composition, and other things.

If you want to try out ScalaGUI, you can get it directly (with examples etc.) from [[http://lampsvn.epfl.ch/svn-repos/dubochet/scala-gui/trunk/|the SVN repository]].