Packages

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    Definition Classes
    root
  • package scala
    Definition Classes
    root
  • package swing

    Scala-swing is a graphical user interface library that will wrap most of Java Swing for Scala in a straightforward manner.

    Scala-swing is a graphical user interface library that will wrap most of Java Swing for Scala in a straightforward manner.

    Overview

    The widget class hierarchy loosely resembles that of Java Swing. The main differences are:

    • In Java Swing all components are containers per default. This does not make much sense for a number of components, like scala.swing.TextField, scala.swing.CheckBox, scala.swing.RadioButton, and so on. Our guess is that this architecture was chosen because Java lacks multiple inheritance. In scala-swing, components that can have child components extend the scala.swing.Container trait.
    • Layout managers and panels are coupled. There is no way to exchange the layout manager of a panel. As a result, the layout constraints for widgets can be typed. (Note that you gain more type-safety and do not loose much flexibility here. Besides being not a common operation, exchanging the layout manager of a panel in Java Swing almost always leads to exchanging the layout constraints for every of the panel's child component. In the end, it is not more work to move all children to a newly created panel.)
    • Widget hierarchies are built by adding children to their parent container's contents collection. The typical usage style is to create anonymous subclasses of the widgets to customize their properties, and nest children and event reactions.
    • The scala-swing event system follows a different approach than the underlying Java system. Instead of adding event listeners with a particular interface (such as java.awt.ActionListener), a scala.swing.Reactor instance announces the interest in receiving events by calling listenTo for a scala.swing.Publisher. Publishers are also reactors and listen to themselves per default as a convenience. A reactor contains an object reactions which serves as a convenient place to register observers by adding partial functions that pattern match for any event that the observer is interested in. This is shown in the examples section below.
    • For more details see SIP-8.

    Scala-swing comprises two main packages:

    • scala.swing: All widget classes and traits.
    • scala.swing.event: The event hierarchy.

    This package object contains useful type aliases that do not have wrappers.

    Examples

    The following example shows how to plug components and containers together and react to a mouse click on a button:

    import scala.swing._

new Frame {
  title = "Hello world"

  contents = new FlowPanel {
    contents += new Label("Launch rainbows:")
    contents += new Button("Click me") {
      reactions += {
        case event.ButtonClicked(_) =>
          println("All the colours!")
      }
    }
  }

  pack()
  centerOnScreen()
  open()
}
p

scala

package scala

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Type Members

  1. type ::[A] = scala.collection.immutable.::[A]
  2. type AbstractMethodError = java.lang.AbstractMethodError
  3. type AnyRef = AnyRef
  4. type ArrayIndexOutOfBoundsException = java.lang.ArrayIndexOutOfBoundsException
  5. type BigDecimal = scala.math.BigDecimal
  6. type BigInt = scala.math.BigInt
  7. type BufferedIterator[+A] = scala.collection.BufferedIterator[A]
  8. type ClassCastException = java.lang.ClassCastException
  9. type Either[+A, +B] = scala.util.Either[A, B]
  10. type Equiv[T] = scala.math.Equiv[T]
  11. type Error = java.lang.Error
  12. type Exception = java.lang.Exception
  13. type Fractional[T] = scala.math.Fractional[T]
  14. type IllegalArgumentException = java.lang.IllegalArgumentException
  15. type IndexOutOfBoundsException = java.lang.IndexOutOfBoundsException
  16. type IndexedSeq[+A] = scala.collection.IndexedSeq[A]
  17. type Integral[T] = scala.math.Integral[T]
  18. type InterruptedException = java.lang.InterruptedException
  19. type Iterable[+A] = scala.collection.Iterable[A]
  20. type Iterator[+A] = scala.collection.Iterator[A]
  21. type Left[+A, +B] = scala.util.Left[A, B]
  22. type List[+A] = scala.collection.immutable.List[A]
  23. type NoSuchElementException = java.util.NoSuchElementException
  24. type NullPointerException = java.lang.NullPointerException
  25. type NumberFormatException = java.lang.NumberFormatException
  26. type Numeric[T] = scala.math.Numeric[T]
  27. type Ordered[T] = scala.math.Ordered[T]
  28. type Ordering[T] = scala.math.Ordering[T]
  29. type PartialOrdering[T] = scala.math.PartialOrdering[T]
  30. type PartiallyOrdered[T] = scala.math.PartiallyOrdered[T]
  31. type Range = scala.collection.immutable.Range
  32. type Right[+A, +B] = scala.util.Right[A, B]
  33. type RuntimeException = java.lang.RuntimeException
  34. type Seq[+A] = scala.collection.Seq[A]
  35. type Stream[+A] = scala.collection.immutable.Stream[A]
  36. type StringBuilder = scala.collection.mutable.StringBuilder
  37. type StringIndexOutOfBoundsException = java.lang.StringIndexOutOfBoundsException
  38. type Throwable = java.lang.Throwable
  39. type Traversable[+A] = scala.collection.Traversable[A]
  40. type TraversableOnce[+A] = scala.collection.TraversableOnce[A]
  41. type UnsupportedOperationException = java.lang.UnsupportedOperationException
  42. type Vector[+A] = scala.collection.immutable.Vector[A]

Value Members

  1. val #::: scala.collection.immutable.Stream.#::.type
  2. val +:: scala.collection.+:.type
  3. val :+: scala.collection.:+.type
  4. val ::: scala.collection.immutable.::.type
  5. val AnyRef: Specializable
  6. val BigDecimal: scala.math.BigDecimal.type
  7. val BigInt: scala.math.BigInt.type
  8. val Either: scala.util.Either.type
  9. val Equiv: scala.math.Equiv.type
  10. val Fractional: scala.math.Fractional.type
  11. val IndexedSeq: scala.collection.IndexedSeq.type
  12. val Integral: scala.math.Integral.type
  13. val Iterable: scala.collection.Iterable.type
  14. val Iterator: scala.collection.Iterator.type
  15. val Left: scala.util.Left.type
  16. val List: scala.collection.immutable.List.type
  17. val Nil: scala.collection.immutable.Nil.type
  18. val Numeric: scala.math.Numeric.type
  19. val Ordered: scala.math.Ordered.type
  20. val Ordering: scala.math.Ordering.type
  21. val Range: scala.collection.immutable.Range.type
  22. val Right: scala.util.Right.type
  23. val Seq: scala.collection.Seq.type
  24. val Stream: scala.collection.immutable.Stream.type
  25. val StringBuilder: scala.collection.mutable.StringBuilder.type
  26. val Traversable: scala.collection.Traversable.type
  27. val Vector: scala.collection.immutable.Vector.type

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