src/Tools/jEdit/src/jedit/output_dockable.scala

more systematic treatment of physical document wrt. font size etc.;
eliminated (crude) double buffering;
tuned;

/*  Title:      Tools/jEdit/src/jedit/output_dockable.scala
    Author:     Makarius

Dockable window with result message output.
*/

package isabelle.jedit


import isabelle._

import scala.actors.Actor._

import scala.swing.{FlowPanel, Button, ToggleButton}
import scala.swing.event.ButtonClicked

import javax.swing.JPanel
import java.awt.{BorderLayout, Dimension}

import org.gjt.sp.jedit.View
import org.gjt.sp.jedit.gui.DockableWindowManager



class Output_Dockable(view: View, position: String) extends JPanel(new BorderLayout)
{
  if (position == DockableWindowManager.FLOATING)
    setPreferredSize(new Dimension(500, 250))

  val controls = new FlowPanel(FlowPanel.Alignment.Right)()
  add(controls.peer, BorderLayout.NORTH)

  val html_panel = new HTML_Panel(Isabelle.system, Isabelle.font_size(), null)
  add(html_panel, BorderLayout.CENTER)


  /* controls */

  private case class Render(body: List[XML.Tree])

  private def handle_update()
  {
    Swing_Thread.now {
      Document_Model(view.getBuffer) match {
        case Some(model) =>
          val document = model.recent_document
          document.command_at(view.getTextArea.getCaretPosition) match {
            case Some((cmd, _)) =>
              output_actor ! Render(document.current_state(cmd).results)
            case None =>
          }
        case None =>
      }
    }
  }

  private val update = new Button("Update") {
    reactions += { case ButtonClicked(_) => handle_update() }
  }

  val follow = new ToggleButton("Follow")
  follow.selected = true


  /* actor wiring */

  private val output_actor = actor {
    loop {
      react {
        case Session.Global_Settings => html_panel.resize(Isabelle.font_size())

        case Render(body) => html_panel.render(body)

        case cmd: Command =>
          Swing_Thread.now {
            if (follow.selected) Document_Model(view.getBuffer) else None
          } match {
            case None =>
            case Some(model) => html_panel.render(model.recent_document.current_state(cmd).results)
          }

        case bad => System.err.println("output_actor: ignoring bad message " + bad)
      }
    }
  }

  override def addNotify()
  {
    super.addNotify()
    Isabelle.session.results += output_actor
    Isabelle.session.global_settings += output_actor
  }

  override def removeNotify()
  {
    Isabelle.session.results -= output_actor
    Isabelle.session.global_settings -= output_actor
    super.removeNotify()
  }


  /* init controls */

  controls.contents ++= List(update, follow)
  handle_update()
}