--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/Pure/System/swing_thread.scala Wed May 05 22:23:45 2010 +0200
@@ -0,0 +1,63 @@
+/* Title: Pure/System/swing_thread.scala
+ Author: Makarius
+ Author: Fabian Immler, TU Munich
+
+Evaluation within the AWT/Swing thread.
+*/
+
+package isabelle
+
+import javax.swing.{SwingUtilities, Timer}
+import java.awt.event.{ActionListener, ActionEvent}
+
+
+object Swing_Thread
+{
+ /* checks */
+
+ def assert() = Predef.assert(SwingUtilities.isEventDispatchThread())
+ def require() = Predef.require(SwingUtilities.isEventDispatchThread())
+
+
+ /* main dispatch queue */
+
+ def now[A](body: => A): A =
+ {
+ var result: Option[A] = None
+ if (SwingUtilities.isEventDispatchThread()) { result = Some(body) }
+ else SwingUtilities.invokeAndWait(new Runnable { def run = { result = Some(body) } })
+ result.get
+ }
+
+ def future[A](body: => A): Future[A] =
+ {
+ if (SwingUtilities.isEventDispatchThread()) Future.value(body)
+ else Future.fork { now(body) }
+ }
+
+ def later(body: => Unit)
+ {
+ if (SwingUtilities.isEventDispatchThread()) body
+ else SwingUtilities.invokeLater(new Runnable { def run = body })
+ }
+
+
+ /* delayed actions */
+
+ private def delayed_action(first: Boolean)(time_span: Int)(action: => Unit): () => Unit =
+ {
+ val listener =
+ new ActionListener { override def actionPerformed(e: ActionEvent) { action } }
+ val timer = new Timer(time_span, listener)
+ timer.setRepeats(false)
+
+ def invoke() { if (first) timer.start() else timer.restart() }
+ invoke _
+ }
+
+ // delayed action after first invocation
+ def delay_first = delayed_action(true) _
+
+ // delayed action after last invocation
+ def delay_last = delayed_action(false) _
+}