Scala example source code file (Slider.scala)

This example Scala source code file (Slider.scala) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Scala tags/keywords

any, boolean, boolean, component, gui, int, int, jlabel, jslider, jslider, label, label, publisher, slider, supermixin, swing

The Scala Slider.scala source code

/*                     __                                               *\
**     ________ ___   / /  ___     Scala API                            **
**    / __/ __// _ | / /  / _ |    (c) 2007-2011, LAMP/EPFL             **
**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
** /____/\___/_/ |_/____/_/ | |                                         **
**                          |/                                          **
\*                                                                      */



package scala.swing

import javax.swing.{JSlider, JLabel}
import event._

/**
 * Lets users select a value from a given range. Visually, this is represented
 * as a draggable knob on a horizontal or vertical bar.
 * 
 * Fires a ValueChanged event whenever the slider's value changes and 
 * when the knob is released.
 * 
 * @see javax.swing.JSlider
 */
class Slider extends Component with Orientable.Wrapper with Publisher {
  override lazy val peer: JSlider = new JSlider with SuperMixin
  
  def min: Int = peer.getMinimum
  def min_=(v: Int) { peer.setMinimum(v) }
  def max: Int = peer.getMaximum
  def max_=(v: Int) { peer.setMaximum(v) }
  def value: Int = peer.getValue
  def value_=(v: Int) { peer.setValue(v) }
  def extent: Int = peer.getExtent
  def extent_=(v: Int) { peer.setExtent(v) }
  
  def paintLabels: Boolean = peer.getPaintLabels
  def paintLabels_=(v: Boolean) { peer.setPaintLabels(v) }
  def paintTicks: Boolean = peer.getPaintTicks
  def paintTicks_=(v: Boolean) { peer.setPaintTicks(v) }
  def paintTrack: Boolean = peer.getPaintTrack
  def paintTrack_=(v: Boolean) { peer.setPaintTrack(v) }
  
  def snapToTicks: Boolean = peer.getSnapToTicks
  def snapToTicks_=(v: Boolean) { peer.setSnapToTicks(v) }
  
  def minorTickSpacing: Int = peer.getMinorTickSpacing
  def minorTickSpacing_=(v: Int) { peer.setMinorTickSpacing(v) }
  def majorTickSpacing: Int = peer.getMajorTickSpacing
  def majorTickSpacing_=(v: Int) { peer.setMajorTickSpacing(v) }
  
  def adjusting = peer.getValueIsAdjusting
  
  def labels: scala.collection.Map[Int, Label] = {
    val labelTable = peer.getLabelTable.asInstanceOf[java.util.Hashtable[Int, JLabel]]
    new scala.collection.JavaConversions.JMapWrapper(labelTable)
      .mapValues(v => UIElement.cachedWrapper[Label](v))
  }
  def labels_=(l: scala.collection.Map[Int, Label]) {
    // TODO: do some lazy wrapping
    val table = new java.util.Hashtable[Any, Any]
    for ((k,v) <- l) table.put(k, v.peer)
    peer.setLabelTable(table)
  }
  
  peer.addChangeListener(new javax.swing.event.ChangeListener {
    def stateChanged(e: javax.swing.event.ChangeEvent) { 
      publish(new ValueChanged(Slider.this)) 
    }
  })
}