scala.swing.Container.scala Maven / Gradle / Ivy
/* __ *\
** ________ ___ / / ___ Scala API **
** / __/ __// _ | / / / _ | (c) 2007-2013, LAMP/EPFL **
** __\ \/ /__/ __ |/ /__/ __ | http://scala-lang.org/ **
** /____/\___/_/ |_/____/_/ | | **
** |/ **
\* */
package scala.swing
import event._
import scala.collection.mutable.Buffer
object Container {
/**
* Utility trait for wrapping containers. Provides an immutable
* implementation of the contents member.
*/
trait Wrapper extends Container with Publisher {
override def peer: javax.swing.JComponent
protected val _contents = new Content
def contents: Seq[Component] = _contents
protected class Content extends BufferWrapper[Component] {
override def clear() { peer.removeAll() }
override def remove(n: Int): Component = {
val c = peer.getComponent(n)
peer.remove(n)
UIElement.cachedWrapper[Component](c)
}
protected def insertAt(n: Int, c: Component) { peer.add(c.peer, n) }
def +=(c: Component): this.type = { peer.add(c.peer) ; this }
def length = peer.getComponentCount
def apply(n: Int) = UIElement.cachedWrapper[Component](peer.getComponent(n))
}
peer.addContainerListener(new java.awt.event.ContainerListener {
def componentAdded(e: java.awt.event.ContainerEvent) {
publish(ComponentAdded(Wrapper.this,
UIElement.cachedWrapper[Component](e.getChild.asInstanceOf[javax.swing.JComponent])))
}
def componentRemoved(e: java.awt.event.ContainerEvent) {
publish(ComponentRemoved(Wrapper.this,
UIElement.cachedWrapper[Component](e.getChild.asInstanceOf[javax.swing.JComponent])))
}
})
}
}
/**
* The base traits for UI elements that can contain Components.
*
* @note [Java Swing] This is not the wrapper for java.awt.Container but a trait
* that extracts a common interface for components, menus, and windows.
*/
trait Container extends UIElement {
/**
* The child components of this container.
*/
def contents: Seq[Component]
}