Created
September 5, 2011 18:30
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Style-sheet like properties
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| object UnitType extends Enumeration { | |
| val Em = Value("em") | |
| val Px = Value("px") | |
| val Pc = Value("%") | |
| } | |
| import UnitType._ | |
| case class Dimension( | |
| val length : Double = 0.0, | |
| val unit : UnitType.Value = Px) { | |
| override def toString = "%.2f".format(length) + unit | |
| } | |
| case class Color( | |
| val red : Double = 1.0, | |
| val green : Double = 1.0, | |
| val blue : Double = 1.0, | |
| val alpha : Double = 1.0) { | |
| override def toString = "#" + hex(red) + hex(green) + hex(blue) + hex(alpha) | |
| def hex(x : Double) : String = "%02x".format((x * 255).toInt) | |
| } | |
| sealed abstract class Property[T](val name : String, val value : T) { | |
| override def equals(other : Any) : Boolean = | |
| other match { | |
| case x : Property[_] => name == x.name | |
| case _ => false | |
| } | |
| def +(other : Property[_]) : Set[Property[_]] = Set(this, other) | |
| } | |
| case class Width(v : Dimension = Dimension()) extends Property("width", v) | |
| case class Height(v : Dimension = Dimension()) extends Property("height", v) | |
| case class BackgroundColor(v : Color = Color()) extends Property("bgcolor", v) | |
| val props : Set[Property[_]] = | |
| Set( | |
| Width(Dimension(15, Px)), | |
| BackgroundColor(Color(0.5, 0, 0)), | |
| Width(Dimension(20, Px)) | |
| ) | |
| val props2 : Set[Property[_]] = | |
| Width(Dimension(15)) + | |
| Height(Dimension(100, Pc)) + | |
| Height(Dimension(100, Px)) | |
| println(props) | |
| println(props2) | |
| props foreach { | |
| _ match { | |
| case Width(x) => println("we have a width of " + x) | |
| case other => println("we have another property: " + other.name + " -> " + other.value) | |
| } | |
| } | |
| val bgcolor : Color = props2 collectFirst { case BackgroundColor(c) => c } getOrElse Color() | |
| println("background color is " + bgcolor) |
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