scala.swing.ComboBox.scala Maven / Gradle / Ivy
/* __ *\
** ________ ___ / / ___ Scala API **
** / __/ __// _ | / / / _ | (c) 2007-2011, LAMP/EPFL **
** __\ \/ /__/ __ |/ /__/ __ | http://scala-lang.org/ **
** /____/\___/_/ |_/____/_/ | | **
** |/ **
\* */
package scala.swing
import event._
import javax.swing.{JList, JComponent, JComboBox, JTextField, ComboBoxModel, AbstractListModel, ListCellRenderer}
import java.awt.event.ActionListener
object ComboBox {
/**
* An editor for a combo box. Let's you edit the currently selected item.
* It is highly recommended to use the BuiltInEditor class. For anything
* else, one cannot guarantee that it integrates nicely with the current
* LookAndFeel.
*
* Publishes action events.
*/
trait Editor[A] extends Publisher {
lazy val comboBoxPeer: javax.swing.ComboBoxEditor = new javax.swing.ComboBoxEditor with Publisher {
def addActionListener(l: ActionListener) {
this match {
// TODO case w: Action.Trigger.Wrapper =>
// w.peer.addActionListener(l)
case _ =>
this.subscribe(new Reactions.Wrapper(l) ({
case ActionEvent(c) => l.actionPerformed(new java.awt.event.ActionEvent(c.peer, 0, ""))
}))
}
}
def removeActionListener(l: ActionListener) {
this match {
// TODO case w: Action.Trigger.Wrapper =>
// w.peer.removeActionListener(l)
case _ =>
this.unsubscribe(new Reactions.Wrapper(l)({ case _ => }))
}
}
def getEditorComponent: JComponent = Editor.this.component.peer
def getItem(): AnyRef = item.asInstanceOf[AnyRef]
def selectAll() { startEditing() }
def setItem(a: Any) { item = a.asInstanceOf[A] }
}
def component: Component
def item: A
def item_=(a: A)
def startEditing()
}
/**
* Use this editor, if you want to reuse the builtin editor supplied by the current
* Look and Feel. This is restricted to a text field as the editor widget. The
* conversion from and to a string is done by the supplied functions.
*
* It's okay if string2A throws exceptions. They are caught by an input verifier.
*/
class BuiltInEditor[A](comboBox: ComboBox[A])(string2A: String => A,
a2String: A => String) extends ComboBox.Editor[A] {
protected[swing] class DelegatedEditor(editor: javax.swing.ComboBoxEditor) extends javax.swing.ComboBoxEditor {
var value: A = {
val v = comboBox.peer.getSelectedItem
try {
v match {
case s: String => string2A(s)
case _ => v.asInstanceOf[A]
}
} catch {
case _: Exception =>
throw new IllegalArgumentException("ComboBox not initialized with a proper value, was '" + v + "'.")
}
}
def addActionListener(l: ActionListener) {
editor.addActionListener(l)
}
def removeActionListener(l: ActionListener) {
editor.removeActionListener(l)
}
def getEditorComponent: JComponent = editor.getEditorComponent.asInstanceOf[JComponent]
def selectAll() { editor.selectAll() }
def getItem(): AnyRef = { verifier.verify(getEditorComponent); value.asInstanceOf[AnyRef] }
def setItem(a: Any) { editor.setItem(a) }
val verifier = new javax.swing.InputVerifier {
// TODO: should chain with potentially existing verifier in editor
def verify(c: JComponent) = try {
value = string2A(c.asInstanceOf[JTextField].getText)
true
}
catch {
case e: Exception => false
}
}
def textEditor = getEditorComponent.asInstanceOf[JTextField]
textEditor.setInputVerifier(verifier)
textEditor.addActionListener(Swing.ActionListener{ a =>
getItem() // make sure our value is updated
textEditor.setText(a2String(value))
})
}
override lazy val comboBoxPeer: javax.swing.ComboBoxEditor = new DelegatedEditor(comboBox.peer.getEditor)
def component = Component.wrap(comboBoxPeer.getEditorComponent.asInstanceOf[JComponent])
def item: A = { comboBoxPeer.asInstanceOf[DelegatedEditor].value }
def item_=(a: A) { comboBoxPeer.setItem(a2String(a)) }
def startEditing() { comboBoxPeer.selectAll() }
}
implicit def stringEditor(c: ComboBox[String]): Editor[String] = new BuiltInEditor(c)(s => s, s => s)
implicit def intEditor(c: ComboBox[Int]): Editor[Int] = new BuiltInEditor(c)(s => s.toInt, s => s.toString)
implicit def floatEditor(c: ComboBox[Float]): Editor[Float] = new BuiltInEditor(c)(s => s.toFloat, s => s.toString)
implicit def doubleEditor(c: ComboBox[Double]): Editor[Double] = new BuiltInEditor(c)(s => s.toDouble, s => s.toString)
def newConstantModel[A](items: Seq[A]): ComboBoxModel = {
new AbstractListModel with ComboBoxModel {
private var selected: A = if (items.isEmpty) null.asInstanceOf[A] else items(0)
def getSelectedItem: AnyRef = selected.asInstanceOf[AnyRef]
def setSelectedItem(a: Any) {
if ((selected != null && selected != a) ||
selected == null && a != null) {
selected = a.asInstanceOf[A]
fireContentsChanged(this, -1, -1)
}
}
def getElementAt(n: Int) = items(n).asInstanceOf[AnyRef]
def getSize = items.size
}
}
/*def newMutableModel[A, Self](items: Seq[A] with scala.collection.mutable.Publisher[scala.collection.mutable.Message[A], Self]): ComboBoxModel = {
new AbstractListModel with ComboBoxModel {
private var selected = items(0)
def getSelectedItem: AnyRef = selected.asInstanceOf[AnyRef]
def setSelectedItem(a: Any) { selected = a.asInstanceOf[A] }
def getElementAt(n: Int) = items(n).asInstanceOf[AnyRef]
def getSize = items.size
}
}
def newConstantModel[A](items: Seq[A]): ComboBoxModel = items match {
case items: Seq[A] with scala.collection.mutable.Publisher[scala.collection.mutable.Message[A], Self] => newMutableModel
case _ => newConstantModel(items)
}*/
}
/**
* Let's the user make a selection from a list of predefined items. Visually,
* this is implemented as a button-like component with a pull-down menu.
*
* @see javax.swing.JComboBox
*/
class ComboBox[A](items: Seq[A]) extends Component with Publisher {
override lazy val peer: JComboBox = new JComboBox(ComboBox.newConstantModel(items)) with SuperMixin
object selection extends Publisher {
def index: Int = peer.getSelectedIndex
def index_=(n: Int) { peer.setSelectedIndex(n) }
def item: A = peer.getSelectedItem.asInstanceOf[A]
def item_=(a: A) { peer.setSelectedItem(a) }
peer.addActionListener(Swing.ActionListener { e =>
publish(event.SelectionChanged(ComboBox.this))
})
}
/**
* Sets the renderer for this combo box's items. Index -1 is
* passed to the renderer for the selected item (not in the pull-down menu).
*
* The underlying combo box renders all items in a ListView
* (both, in the pull-down menu as well as in the box itself), hence the
* ListView.Renderer.
*
* Note that the UI peer of a combo box usually changes the colors
* of the component to its own defaults _after_ the renderer has been
* configured. That's Swing's principle of most suprise.
*/
def renderer: ListView.Renderer[A] = ListView.Renderer.wrap(peer.getRenderer)
def renderer_=(r: ListView.Renderer[A]) { peer.setRenderer(r.peer) }
/* XXX: currently not safe to expose:
def editor: ComboBox.Editor[A] =
def editor_=(r: ComboBox.Editor[A]) { peer.setEditor(r.comboBoxPeer) }
*/
def editable: Boolean = peer.isEditable
/**
* Makes this combo box editable. In order to do so, this combo needs an
* editor which is supplied by the implicit argument. For default
* editors, see ComboBox companion object.
*/
def makeEditable()(implicit editor: ComboBox[A] => ComboBox.Editor[A]) {
peer.setEditable(true)
peer.setEditor(editor(this).comboBoxPeer)
}
def prototypeDisplayValue: Option[A] = toOption[A](peer.getPrototypeDisplayValue)
def prototypeDisplayValue_=(v: Option[A]) {
peer.setPrototypeDisplayValue(v map toAnyRef orNull)
}
}