src/Tools/jEdit/src/document_view.scala
author wenzelm
Wed Jun 15 21:11:53 2011 +0200 (2011-06-15 ago)
changeset 43404 c8369f3d88a1
parent 43397 dba359c0ae3b
child 43414 f0770743b7ec
permissions -rw-r--r--
uniform use of Document_View.robust_body;
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/*  Title:      Tools/jEdit/src/document_view.scala
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    Author:     Fabian Immler, TU Munich
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    Author:     Makarius
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Document view connected to jEdit text area.
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*/
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package isabelle.jedit
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import isabelle._
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import scala.actors.Actor._
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import java.awt.{BorderLayout, Graphics, Color, Dimension, Graphics2D, Point}
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import java.awt.event.{MouseAdapter, MouseMotionAdapter, MouseEvent,
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  FocusAdapter, FocusEvent, WindowEvent, WindowAdapter}
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import javax.swing.{JPanel, ToolTipManager, Popup, PopupFactory, SwingUtilities, BorderFactory}
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import javax.swing.event.{CaretListener, CaretEvent}
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import org.gjt.sp.util.Log
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import org.gjt.sp.jedit.{jEdit, OperatingSystem, Debug}
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import org.gjt.sp.jedit.gui.RolloverButton
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import org.gjt.sp.jedit.options.GutterOptionPane
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import org.gjt.sp.jedit.textarea.{JEditTextArea, TextArea, TextAreaExtension, TextAreaPainter}
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import org.gjt.sp.jedit.syntax.{SyntaxStyle}
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object Document_View
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{
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  /* document view of text area */
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  private val key = new Object
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  def apply(text_area: JEditTextArea): Option[Document_View] =
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  {
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    Swing_Thread.require()
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    text_area.getClientProperty(key) match {
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      case doc_view: Document_View => Some(doc_view)
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      case _ => None
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    }
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  }
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  def exit(text_area: JEditTextArea)
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  {
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    Swing_Thread.require()
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    apply(text_area) match {
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      case None =>
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      case Some(doc_view) =>
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        doc_view.deactivate()
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        text_area.putClientProperty(key, null)
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    }
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  }
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  def init(model: Document_Model, text_area: JEditTextArea): Document_View =
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  {
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    exit(text_area)
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    val doc_view = new Document_View(model, text_area)
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    text_area.putClientProperty(key, doc_view)
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    doc_view.activate()
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    doc_view
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  }
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}
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class Document_View(val model: Document_Model, val text_area: JEditTextArea)
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{
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  private val session = model.session
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  /** robust extension body **/
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  def robust_body[A](default: A)(body: => A): A =
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    Swing_Thread.now {
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      try {
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        Isabelle.buffer_lock(model.buffer) {
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          if (model.buffer == text_area.getBuffer) body
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          else default
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        }
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      }
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      catch { case t: Throwable => Log.log(Log.ERROR, this, t); default }
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    }
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  /** token handling **/
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  /* visible line ranges */
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  // simplify slightly odd result of TextArea.getScreenLineEndOffset etc.
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  // NB: jEdit already normalizes \r\n and \r to \n
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  def proper_line_range(start: Text.Offset, end: Text.Offset): Text.Range =
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  {
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    val stop = if (start < end) end - 1 else end min model.buffer.getLength
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    Text.Range(start, stop)
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  }
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  def screen_lines_range(): Text.Range =
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  {
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    val start = text_area.getScreenLineStartOffset(0)
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    val raw_end = text_area.getScreenLineEndOffset(text_area.getVisibleLines - 1 max 0)
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    proper_line_range(start, if (raw_end >= 0) raw_end else model.buffer.getLength)
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  }
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  def invalidate_line_range(range: Text.Range)
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  {
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    text_area.invalidateLineRange(
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      model.buffer.getLineOfOffset(range.start),
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      model.buffer.getLineOfOffset(range.stop))
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  }
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  /* HTML popups */
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  private var html_popup: Option[Popup] = None
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  private def exit_popup() { html_popup.map(_.hide) }
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  private val html_panel =
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    new HTML_Panel(Isabelle.system, Isabelle.font_family(), scala.math.round(Isabelle.font_size()))
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  html_panel.setBorder(BorderFactory.createLineBorder(Color.black))
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  private def html_panel_resize()
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  {
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    Swing_Thread.now {
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      html_panel.resize(Isabelle.font_family(), scala.math.round(Isabelle.font_size()))
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    }
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  }
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  private def init_popup(snapshot: Document.Snapshot, x: Int, y: Int)
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  {
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    exit_popup()
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/* FIXME broken
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    val offset = text_area.xyToOffset(x, y)
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    val p = new Point(x, y); SwingUtilities.convertPointToScreen(p, text_area.getPainter)
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    // FIXME snapshot.cumulate
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    snapshot.select_markup(Text.Range(offset, offset + 1))(Isabelle_Markup.popup) match {
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      case Text.Info(_, Some(msg)) #:: _ =>
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        val popup = PopupFactory.getSharedInstance().getPopup(text_area, html_panel, p.x, p.y + 60)
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        html_panel.render_sync(List(msg))
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        Thread.sleep(10)  // FIXME !?
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        popup.show
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        html_popup = Some(popup)
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      case _ =>
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    }
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*/
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  }
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  /* subexpression highlighting */
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  private def subexp_range(snapshot: Document.Snapshot, x: Int, y: Int)
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    : Option[(Text.Range, Color)] =
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  {
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    val offset = text_area.xyToOffset(x, y)
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    snapshot.select_markup(Text.Range(offset, offset + 1))(Isabelle_Markup.subexp) match {
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      case Text.Info(_, Some((range, color))) #:: _ => Some((snapshot.convert(range), color))
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      case _ => None
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    }
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  }
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  @volatile private var _highlight_range: Option[(Text.Range, Color)] = None
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  def highlight_range(): Option[(Text.Range, Color)] = _highlight_range
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  /* CONTROL-mouse management */
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  private var control: Boolean = false
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  private def exit_control()
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  {
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    exit_popup()
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    _highlight_range = None
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  }
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  private val focus_listener = new FocusAdapter {
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    override def focusLost(e: FocusEvent) {
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      _highlight_range = None // FIXME exit_control !?
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    }
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  }
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  private val window_listener = new WindowAdapter {
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    override def windowIconified(e: WindowEvent) { exit_control() }
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    override def windowDeactivated(e: WindowEvent) { exit_control() }
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  }
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  private val mouse_motion_listener = new MouseMotionAdapter {
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    override def mouseMoved(e: MouseEvent) {
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      control = if (OperatingSystem.isMacOS()) e.isMetaDown else e.isControlDown
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      val x = e.getX()
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      val y = e.getY()
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      if (!model.buffer.isLoaded) exit_control()
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      else
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        Isabelle.swing_buffer_lock(model.buffer) {
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          val snapshot = model.snapshot
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          if (control) init_popup(snapshot, x, y)
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          _highlight_range map { case (range, _) => invalidate_line_range(range) }
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          _highlight_range = if (control) subexp_range(snapshot, x, y) else None
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          _highlight_range map { case (range, _) => invalidate_line_range(range) }
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        }
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    }
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  }
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  /* text area painting */
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  private val text_area_painter = new Text_Area_Painter(this)
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  private val tooltip_painter = new TextAreaExtension
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  {
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    override def getToolTipText(x: Int, y: Int): String =
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    {
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      robust_body(null: String) {
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        val snapshot = model.snapshot()
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        val offset = text_area.xyToOffset(x, y)
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        if (control) {
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          snapshot.select_markup(Text.Range(offset, offset + 1))(Isabelle_Markup.tooltip) match
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          {
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            case Text.Info(_, Some(text)) #:: _ => Isabelle.tooltip(text)
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            case _ => null
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          }
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        }
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        else {
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          // FIXME snapshot.cumulate
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          snapshot.select_markup(Text.Range(offset, offset + 1))(Isabelle_Markup.popup) match
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          {
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            case Text.Info(_, Some(text)) #:: _ => Isabelle.tooltip(text)
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            case _ => null
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          }
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        }
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      }
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    }
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  }
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  private val gutter_painter = new TextAreaExtension
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  {
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    override def paintScreenLineRange(gfx: Graphics2D,
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      first_line: Int, last_line: Int, physical_lines: Array[Int],
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      start: Array[Int], end: Array[Int], y: Int, line_height: Int)
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    {
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      robust_body(()) {
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        val gutter = text_area.getGutter
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        val width = GutterOptionPane.getSelectionAreaWidth
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        val border_width = jEdit.getIntegerProperty("view.gutter.borderWidth", 3)
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        val FOLD_MARKER_SIZE = 12
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        if (gutter.isSelectionAreaEnabled && !gutter.isExpanded && width >= 12 && line_height >= 12) {
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          Isabelle.swing_buffer_lock(model.buffer) {
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            val snapshot = model.snapshot()
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            for (i <- 0 until physical_lines.length) {
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              if (physical_lines(i) != -1) {
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                val line_range = proper_line_range(start(i), end(i))
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                // gutter icons
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                val icons =
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                  (for (Text.Info(_, Some(icon)) <- // FIXME snapshot.cumulate
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                    snapshot.select_markup(line_range)(Isabelle_Markup.gutter_message).iterator)
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                  yield icon).toList.sortWith(_ >= _)
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                icons match {
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                  case icon :: _ =>
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                    val icn = icon.icon
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                    val x0 = (FOLD_MARKER_SIZE + width - border_width - icn.getIconWidth) max 10
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                    val y0 = y + i * line_height + (((line_height - icn.getIconHeight) / 2) max 0)
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                    icn.paintIcon(gutter, gfx, x0, y0)
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                  case Nil =>
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                }
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              }
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            }
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          }
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        }
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      }
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    }
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  }
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  /* caret handling */
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  def selected_command(): Option[Command] =
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  {
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    Swing_Thread.require()
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    model.snapshot().node.proper_command_at(text_area.getCaretPosition)
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  }
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  private val caret_listener = new CaretListener {
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    private val delay = Swing_Thread.delay_last(session.input_delay) {
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      session.perspective.event(Session.Perspective)
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    }
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    override def caretUpdate(e: CaretEvent) { delay() }
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  }
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  /* overview of command status left of scrollbar */
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  private val overview = new JPanel(new BorderLayout)
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  {
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    private val WIDTH = 10
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    private val HEIGHT = 2
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    setPreferredSize(new Dimension(WIDTH, 0))
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    setRequestFocusEnabled(false)
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    addMouseListener(new MouseAdapter {
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      override def mousePressed(event: MouseEvent) {
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        val line = y_to_line(event.getY)
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        if (line >= 0 && line < text_area.getLineCount)
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          text_area.setCaretPosition(text_area.getLineStartOffset(line))
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      }
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    })
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    override def addNotify() {
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      super.addNotify()
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      ToolTipManager.sharedInstance.registerComponent(this)
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    }
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    override def removeNotify() {
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      ToolTipManager.sharedInstance.unregisterComponent(this)
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      super.removeNotify
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    }
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    override def paintComponent(gfx: Graphics)
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    {
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      super.paintComponent(gfx)
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      Swing_Thread.assert()
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      val buffer = model.buffer
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      Isabelle.buffer_lock(buffer) {
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        val snapshot = model.snapshot()
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        def line_range(command: Command, start: Text.Offset): Option[(Int, Int)] =
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        {
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          try {
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            val line1 = buffer.getLineOfOffset(snapshot.convert(start))
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            val line2 = buffer.getLineOfOffset(snapshot.convert(start + command.length)) + 1
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            Some((line1, line2))
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          }
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          catch { case e: ArrayIndexOutOfBoundsException => None }
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        }
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        for {
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          (command, start) <- snapshot.node.command_starts
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          if !command.is_ignored
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          (line1, line2) <- line_range(command, start)
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          val y = line_to_y(line1)
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          val height = HEIGHT * (line2 - line1)
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          color <- Isabelle_Markup.overview_color(snapshot, command)
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        } {
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          gfx.setColor(color)
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          gfx.fillRect(0, y, getWidth - 1, height)
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        }
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      }
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    }
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    private def line_to_y(line: Int): Int =
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      (line * getHeight) / (text_area.getBuffer.getLineCount max text_area.getVisibleLines)
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    private def y_to_line(y: Int): Int =
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      (y * (text_area.getBuffer.getLineCount max text_area.getVisibleLines)) / getHeight
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  }
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wenzelm@39740
   365
  /* main actor */
wenzelm@39740
   366
wenzelm@39740
   367
  private val main_actor = actor {
wenzelm@39740
   368
    loop {
wenzelm@39740
   369
      react {
wenzelm@39740
   370
        case Session.Commands_Changed(changed) =>
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   371
          val buffer = model.buffer
wenzelm@39740
   372
          Isabelle.swing_buffer_lock(buffer) {
wenzelm@39740
   373
            val snapshot = model.snapshot()
wenzelm@39740
   374
wenzelm@39740
   375
            if (changed.exists(snapshot.node.commands.contains))
wenzelm@39740
   376
              overview.repaint()
wenzelm@39740
   377
wenzelm@39740
   378
            val visible_range = screen_lines_range()
wenzelm@39740
   379
            val visible_cmds = snapshot.node.command_range(snapshot.revert(visible_range)).map(_._1)
wenzelm@39740
   380
            if (visible_cmds.exists(changed)) {
wenzelm@39740
   381
              for {
wenzelm@39740
   382
                line <- 0 until text_area.getVisibleLines
wenzelm@39740
   383
                val start = text_area.getScreenLineStartOffset(line) if start >= 0
wenzelm@39740
   384
                val end = text_area.getScreenLineEndOffset(line) if end >= 0
wenzelm@39740
   385
                val range = proper_line_range(start, end)
wenzelm@39740
   386
                val line_cmds = snapshot.node.command_range(snapshot.revert(range)).map(_._1)
wenzelm@39740
   387
                if line_cmds.exists(changed)
wenzelm@39740
   388
              } text_area.invalidateScreenLineRange(line, line)
wenzelm@39740
   389
wenzelm@39740
   390
              // FIXME danger of deadlock!?
wenzelm@39740
   391
              // FIXME potentially slow!?
wenzelm@39740
   392
              model.buffer.propertiesChanged()
wenzelm@39740
   393
            }
wenzelm@39740
   394
          }
wenzelm@39740
   395
wenzelm@39740
   396
        case Session.Global_Settings => html_panel_resize()
wenzelm@39740
   397
wenzelm@39740
   398
        case bad => System.err.println("command_change_actor: ignoring bad message " + bad)
wenzelm@39740
   399
      }
wenzelm@39740
   400
    }
wenzelm@39740
   401
  }
wenzelm@39740
   402
wenzelm@39740
   403
wenzelm@34784
   404
  /* activation */
wenzelm@34784
   405
wenzelm@34808
   406
  private def activate()
wenzelm@34784
   407
  {
wenzelm@42825
   408
    val painter = text_area.getPainter
wenzelm@43387
   409
    painter.addExtension(TextAreaPainter.LINE_BACKGROUND_LAYER + 1, tooltip_painter)
wenzelm@43381
   410
    text_area_painter.activate()
wenzelm@42825
   411
    text_area.getGutter.addExtension(gutter_painter)
wenzelm@39131
   412
    text_area.addFocusListener(focus_listener)
wenzelm@39741
   413
    text_area.getView.addWindowListener(window_listener)
wenzelm@42825
   414
    painter.addMouseMotionListener(mouse_motion_listener)
wenzelm@34810
   415
    text_area.addCaretListener(caret_listener)
wenzelm@34810
   416
    text_area.addLeftOfScrollBar(overview)
wenzelm@39740
   417
    session.commands_changed += main_actor
wenzelm@39740
   418
    session.global_settings += main_actor
wenzelm@34784
   419
  }
wenzelm@34784
   420
wenzelm@34808
   421
  private def deactivate()
wenzelm@34784
   422
  {
wenzelm@42825
   423
    val painter = text_area.getPainter
wenzelm@39740
   424
    session.commands_changed -= main_actor
wenzelm@39740
   425
    session.global_settings -= main_actor
wenzelm@39131
   426
    text_area.removeFocusListener(focus_listener)
wenzelm@39741
   427
    text_area.getView.removeWindowListener(window_listener)
wenzelm@42825
   428
    painter.removeMouseMotionListener(mouse_motion_listener)
wenzelm@39131
   429
    text_area.removeCaretListener(caret_listener)
wenzelm@34810
   430
    text_area.removeLeftOfScrollBar(overview)
wenzelm@42825
   431
    text_area.getGutter.removeExtension(gutter_painter)
wenzelm@43381
   432
    text_area_painter.deactivate()
wenzelm@43381
   433
    painter.removeExtension(tooltip_painter)
wenzelm@39740
   434
    exit_popup()
wenzelm@34784
   435
  }
wenzelm@42825
   436
}