src/Tools/jEdit/src/jedit/document_view.scala
changeset 43282 5d294220ca43
parent 43281 8d8b6ed0588c
child 43283 446e6621762d
equal deleted inserted replaced
43281:8d8b6ed0588c 43282:5d294220ca43
     1 /*  Title:      Tools/jEdit/src/jedit/document_view.scala
       
     2     Author:     Fabian Immler, TU Munich
       
     3     Author:     Makarius
       
     4 
       
     5 Document view connected to jEdit text area.
       
     6 */
       
     7 
       
     8 package isabelle.jedit
       
     9 
       
    10 
       
    11 import isabelle._
       
    12 
       
    13 import scala.actors.Actor._
       
    14 
       
    15 import java.awt.{BorderLayout, Graphics, Color, Dimension, Graphics2D, Point}
       
    16 import java.awt.event.{MouseAdapter, MouseMotionAdapter, MouseEvent,
       
    17   FocusAdapter, FocusEvent, WindowEvent, WindowAdapter}
       
    18 import javax.swing.{JPanel, ToolTipManager, Popup, PopupFactory, SwingUtilities, BorderFactory}
       
    19 import javax.swing.event.{CaretListener, CaretEvent}
       
    20 import java.util.ArrayList
       
    21 
       
    22 import org.gjt.sp.jedit.{jEdit, OperatingSystem, Debug}
       
    23 import org.gjt.sp.jedit.gui.RolloverButton
       
    24 import org.gjt.sp.jedit.options.GutterOptionPane
       
    25 import org.gjt.sp.jedit.textarea.{JEditTextArea, TextArea, TextAreaExtension, TextAreaPainter}
       
    26 import org.gjt.sp.jedit.syntax.{SyntaxStyle, DisplayTokenHandler, Chunk, Token}
       
    27 
       
    28 
       
    29 object Document_View
       
    30 {
       
    31   /* document view of text area */
       
    32 
       
    33   private val key = new Object
       
    34 
       
    35   def init(model: Document_Model, text_area: JEditTextArea): Document_View =
       
    36   {
       
    37     Swing_Thread.require()
       
    38     val doc_view = new Document_View(model, text_area)
       
    39     text_area.putClientProperty(key, doc_view)
       
    40     doc_view.activate()
       
    41     doc_view
       
    42   }
       
    43 
       
    44   def apply(text_area: JEditTextArea): Option[Document_View] =
       
    45   {
       
    46     Swing_Thread.require()
       
    47     text_area.getClientProperty(key) match {
       
    48       case doc_view: Document_View => Some(doc_view)
       
    49       case _ => None
       
    50     }
       
    51   }
       
    52 
       
    53   def exit(text_area: JEditTextArea)
       
    54   {
       
    55     Swing_Thread.require()
       
    56     apply(text_area) match {
       
    57       case None =>
       
    58       case Some(doc_view) =>
       
    59         doc_view.deactivate()
       
    60         text_area.putClientProperty(key, null)
       
    61     }
       
    62   }
       
    63 }
       
    64 
       
    65 
       
    66 class Document_View(val model: Document_Model, text_area: JEditTextArea)
       
    67 {
       
    68   private val session = model.session
       
    69 
       
    70 
       
    71   /** token handling **/
       
    72 
       
    73   /* extended token styles */
       
    74 
       
    75   private var styles: Array[SyntaxStyle] = null  // owned by Swing thread
       
    76 
       
    77   def extend_styles()
       
    78   {
       
    79     Swing_Thread.require()
       
    80     styles = Document_Model.Token_Markup.extend_styles(text_area.getPainter.getStyles)
       
    81   }
       
    82   extend_styles()
       
    83 
       
    84   def set_styles()
       
    85   {
       
    86     Swing_Thread.require()
       
    87     text_area.getPainter.setStyles(styles)
       
    88   }
       
    89 
       
    90 
       
    91   /* wrap_margin -- cf. org.gjt.sp.jedit.textarea.TextArea.propertiesChanged */
       
    92 
       
    93   def wrap_margin(): Int =
       
    94   {
       
    95     val buffer = text_area.getBuffer
       
    96     val painter = text_area.getPainter
       
    97     val font = painter.getFont
       
    98     val font_context = painter.getFontRenderContext
       
    99 
       
   100     val soft_wrap = buffer.getStringProperty("wrap") == "soft"
       
   101     val max = buffer.getIntegerProperty("maxLineLen", 0)
       
   102 
       
   103     if (max > 0) font.getStringBounds(" " * max, font_context).getWidth.toInt
       
   104     else if (soft_wrap)
       
   105       painter.getWidth - (font.getStringBounds(" ", font_context).getWidth.round.toInt) * 3
       
   106     else 0
       
   107   }
       
   108 
       
   109 
       
   110   /* chunks */
       
   111 
       
   112   def line_chunks(physical_lines: Set[Int]): Map[Text.Offset, Chunk] =
       
   113   {
       
   114     import scala.collection.JavaConversions._
       
   115 
       
   116     val buffer = text_area.getBuffer
       
   117     val painter = text_area.getPainter
       
   118     val margin = wrap_margin().toFloat
       
   119 
       
   120     val out = new ArrayList[Chunk]
       
   121     val handler = new DisplayTokenHandler
       
   122 
       
   123     var result = Map[Text.Offset, Chunk]()
       
   124     for (line <- physical_lines) {
       
   125       out.clear
       
   126       handler.init(painter.getStyles, painter.getFontRenderContext, painter, out, margin)
       
   127       buffer.markTokens(line, handler)
       
   128 
       
   129       val line_start = buffer.getLineStartOffset(line)
       
   130       for (chunk <- handler.getChunkList.iterator)
       
   131         result += (line_start + chunk.offset -> chunk)
       
   132     }
       
   133     result
       
   134   }
       
   135 
       
   136 
       
   137   /* visible line ranges */
       
   138 
       
   139   // simplify slightly odd result of TextArea.getScreenLineEndOffset etc.
       
   140   // NB: jEdit already normalizes \r\n and \r to \n
       
   141   def proper_line_range(start: Text.Offset, end: Text.Offset): Text.Range =
       
   142   {
       
   143     val stop = if (start < end) end - 1 else end min model.buffer.getLength
       
   144     Text.Range(start, stop)
       
   145   }
       
   146 
       
   147   def screen_lines_range(): Text.Range =
       
   148   {
       
   149     val start = text_area.getScreenLineStartOffset(0)
       
   150     val raw_end = text_area.getScreenLineEndOffset(text_area.getVisibleLines - 1 max 0)
       
   151     proper_line_range(start, if (raw_end >= 0) raw_end else model.buffer.getLength)
       
   152   }
       
   153 
       
   154   def invalidate_line_range(range: Text.Range)
       
   155   {
       
   156     text_area.invalidateLineRange(
       
   157       model.buffer.getLineOfOffset(range.start),
       
   158       model.buffer.getLineOfOffset(range.stop))
       
   159   }
       
   160 
       
   161 
       
   162   /* HTML popups */
       
   163 
       
   164   private var html_popup: Option[Popup] = None
       
   165 
       
   166   private def exit_popup() { html_popup.map(_.hide) }
       
   167 
       
   168   private val html_panel =
       
   169     new HTML_Panel(Isabelle.system, Isabelle.font_family(), scala.math.round(Isabelle.font_size()))
       
   170   html_panel.setBorder(BorderFactory.createLineBorder(Color.black))
       
   171 
       
   172   private def html_panel_resize()
       
   173   {
       
   174     Swing_Thread.now {
       
   175       html_panel.resize(Isabelle.font_family(), scala.math.round(Isabelle.font_size()))
       
   176     }
       
   177   }
       
   178 
       
   179   private def init_popup(snapshot: Document.Snapshot, x: Int, y: Int)
       
   180   {
       
   181     exit_popup()
       
   182 /* FIXME broken
       
   183     val offset = text_area.xyToOffset(x, y)
       
   184     val p = new Point(x, y); SwingUtilities.convertPointToScreen(p, text_area.getPainter)
       
   185 
       
   186     // FIXME snapshot.cumulate
       
   187     snapshot.select_markup(Text.Range(offset, offset + 1))(Isabelle_Markup.popup) match {
       
   188       case Text.Info(_, Some(msg)) #:: _ =>
       
   189         val popup = PopupFactory.getSharedInstance().getPopup(text_area, html_panel, p.x, p.y + 60)
       
   190         html_panel.render_sync(List(msg))
       
   191         Thread.sleep(10)  // FIXME !?
       
   192         popup.show
       
   193         html_popup = Some(popup)
       
   194       case _ =>
       
   195     }
       
   196 */
       
   197   }
       
   198 
       
   199 
       
   200   /* subexpression highlighting */
       
   201 
       
   202   private def subexp_range(snapshot: Document.Snapshot, x: Int, y: Int)
       
   203     : Option[(Text.Range, Color)] =
       
   204   {
       
   205     val offset = text_area.xyToOffset(x, y)
       
   206     snapshot.select_markup(Text.Range(offset, offset + 1))(Isabelle_Markup.subexp) match {
       
   207       case Text.Info(_, Some((range, color))) #:: _ => Some((snapshot.convert(range), color))
       
   208       case _ => None
       
   209     }
       
   210   }
       
   211 
       
   212   private var highlight_range: Option[(Text.Range, Color)] = None
       
   213 
       
   214 
       
   215   /* CONTROL-mouse management */
       
   216 
       
   217   private var control: Boolean = false
       
   218 
       
   219   private def exit_control()
       
   220   {
       
   221     exit_popup()
       
   222     highlight_range = None
       
   223   }
       
   224 
       
   225   private val focus_listener = new FocusAdapter {
       
   226     override def focusLost(e: FocusEvent) {
       
   227       highlight_range = None // FIXME exit_control !?
       
   228     }
       
   229   }
       
   230 
       
   231   private val window_listener = new WindowAdapter {
       
   232     override def windowIconified(e: WindowEvent) { exit_control() }
       
   233     override def windowDeactivated(e: WindowEvent) { exit_control() }
       
   234   }
       
   235 
       
   236   private val mouse_motion_listener = new MouseMotionAdapter {
       
   237     override def mouseMoved(e: MouseEvent) {
       
   238       control = if (OperatingSystem.isMacOS()) e.isMetaDown else e.isControlDown
       
   239       val x = e.getX()
       
   240       val y = e.getY()
       
   241 
       
   242       if (!model.buffer.isLoaded) exit_control()
       
   243       else
       
   244         Isabelle.swing_buffer_lock(model.buffer) {
       
   245           val snapshot = model.snapshot
       
   246 
       
   247           if (control) init_popup(snapshot, x, y)
       
   248 
       
   249           highlight_range map { case (range, _) => invalidate_line_range(range) }
       
   250           highlight_range = if (control) subexp_range(snapshot, x, y) else None
       
   251           highlight_range map { case (range, _) => invalidate_line_range(range) }
       
   252         }
       
   253     }
       
   254   }
       
   255 
       
   256 
       
   257   /* TextArea painters */
       
   258 
       
   259   private val background_painter = new TextAreaExtension
       
   260   {
       
   261     override def paintScreenLineRange(gfx: Graphics2D,
       
   262       first_line: Int, last_line: Int, physical_lines: Array[Int],
       
   263       start: Array[Int], end: Array[Int], y: Int, line_height: Int)
       
   264     {
       
   265       Isabelle.swing_buffer_lock(model.buffer) {
       
   266         val snapshot = model.snapshot()
       
   267         val ascent = text_area.getPainter.getFontMetrics.getAscent
       
   268 
       
   269         for (i <- 0 until physical_lines.length) {
       
   270           if (physical_lines(i) != -1) {
       
   271             val line_range = proper_line_range(start(i), end(i))
       
   272 
       
   273             // background color: status
       
   274             val cmds = snapshot.node.command_range(snapshot.revert(line_range))
       
   275             for {
       
   276               (command, command_start) <- cmds if !command.is_ignored
       
   277               val range = line_range.restrict(snapshot.convert(command.range + command_start))
       
   278               r <- Isabelle.gfx_range(text_area, range)
       
   279               color <- Isabelle_Markup.status_color(snapshot, command)
       
   280             } {
       
   281               gfx.setColor(color)
       
   282               gfx.fillRect(r.x, y + i * line_height, r.length, line_height)
       
   283             }
       
   284 
       
   285             // background color (1): markup
       
   286             for {
       
   287               Text.Info(range, Some(color)) <-
       
   288                 snapshot.select_markup(line_range)(Isabelle_Markup.background1).iterator
       
   289               r <- Isabelle.gfx_range(text_area, range)
       
   290             } {
       
   291               gfx.setColor(color)
       
   292               gfx.fillRect(r.x, y + i * line_height, r.length, line_height)
       
   293             }
       
   294 
       
   295             // background color (2): markup
       
   296             for {
       
   297               Text.Info(range, Some(color)) <-
       
   298                 snapshot.select_markup(line_range)(Isabelle_Markup.background2).iterator
       
   299               r <- Isabelle.gfx_range(text_area, range)
       
   300             } {
       
   301               gfx.setColor(color)
       
   302               gfx.fillRect(r.x + 2, y + i * line_height + 2, r.length - 4, line_height - 4)
       
   303             }
       
   304 
       
   305             // sub-expression highlighting -- potentially from other snapshot
       
   306             highlight_range match {
       
   307               case Some((range, color)) if line_range.overlaps(range) =>
       
   308                 Isabelle.gfx_range(text_area, line_range.restrict(range)) match {
       
   309                   case None =>
       
   310                   case Some(r) =>
       
   311                     gfx.setColor(color)
       
   312                     gfx.drawRect(r.x, y + i * line_height, r.length - 1, line_height - 1)
       
   313                 }
       
   314               case _ =>
       
   315             }
       
   316 
       
   317             // squiggly underline
       
   318             for {
       
   319               Text.Info(range, Some(color)) <-
       
   320                 snapshot.select_markup(line_range)(Isabelle_Markup.message).iterator
       
   321               r <- Isabelle.gfx_range(text_area, range)
       
   322             } {
       
   323               gfx.setColor(color)
       
   324               val x0 = (r.x / 2) * 2
       
   325               val y0 = r.y + ascent + 1
       
   326               for (x1 <- Range(x0, x0 + r.length, 2)) {
       
   327                 val y1 = if (x1 % 4 < 2) y0 else y0 + 1
       
   328                 gfx.drawLine(x1, y1, x1 + 1, y1)
       
   329               }
       
   330             }
       
   331           }
       
   332         }
       
   333       }
       
   334     }
       
   335 
       
   336     override def getToolTipText(x: Int, y: Int): String =
       
   337     {
       
   338       Isabelle.swing_buffer_lock(model.buffer) {
       
   339         val snapshot = model.snapshot()
       
   340         val offset = text_area.xyToOffset(x, y)
       
   341         if (control) {
       
   342           snapshot.select_markup(Text.Range(offset, offset + 1))(Isabelle_Markup.tooltip) match
       
   343           {
       
   344             case Text.Info(_, Some(text)) #:: _ => Isabelle.tooltip(text)
       
   345             case _ => null
       
   346           }
       
   347         }
       
   348         else {
       
   349           // FIXME snapshot.cumulate
       
   350           snapshot.select_markup(Text.Range(offset, offset + 1))(Isabelle_Markup.popup) match
       
   351           {
       
   352             case Text.Info(_, Some(text)) #:: _ => Isabelle.tooltip(text)
       
   353             case _ => null
       
   354           }
       
   355         }
       
   356       }
       
   357     }
       
   358   }
       
   359 
       
   360   var use_text_painter = false
       
   361 
       
   362   private val text_painter = new TextAreaExtension
       
   363   {
       
   364     override def paintScreenLineRange(gfx: Graphics2D,
       
   365       first_line: Int, last_line: Int, physical_lines: Array[Int],
       
   366       start: Array[Int], end: Array[Int], y: Int, line_height: Int)
       
   367     {
       
   368       if (use_text_painter) {
       
   369         Isabelle.swing_buffer_lock(model.buffer) {
       
   370           val painter = text_area.getPainter
       
   371           val fm = painter.getFontMetrics
       
   372 
       
   373           val all_chunks = line_chunks(Set[Int]() ++ physical_lines.iterator.filter(i => i != -1))
       
   374 
       
   375           val x0 = text_area.getHorizontalOffset
       
   376           var y0 = y + fm.getHeight - (fm.getLeading + 1) - fm.getDescent
       
   377           for (i <- 0 until physical_lines.length) {
       
   378             if (physical_lines(i) != -1) {
       
   379               all_chunks.get(start(i)) match {
       
   380                 case Some(chunk) =>
       
   381                   Chunk.paintChunkList(chunk, gfx, x0, y0, !Debug.DISABLE_GLYPH_VECTOR)
       
   382                 case None =>
       
   383               }
       
   384             }
       
   385             y0 += line_height
       
   386           }
       
   387         }
       
   388       }
       
   389     }
       
   390   }
       
   391 
       
   392   private val gutter_painter = new TextAreaExtension
       
   393   {
       
   394     override def paintScreenLineRange(gfx: Graphics2D,
       
   395       first_line: Int, last_line: Int, physical_lines: Array[Int],
       
   396       start: Array[Int], end: Array[Int], y: Int, line_height: Int)
       
   397     {
       
   398       val gutter = text_area.getGutter
       
   399       val width = GutterOptionPane.getSelectionAreaWidth
       
   400       val border_width = jEdit.getIntegerProperty("view.gutter.borderWidth", 3)
       
   401       val FOLD_MARKER_SIZE = 12
       
   402 
       
   403       if (gutter.isSelectionAreaEnabled && !gutter.isExpanded && width >= 12 && line_height >= 12) {
       
   404         Isabelle.swing_buffer_lock(model.buffer) {
       
   405           val snapshot = model.snapshot()
       
   406           for (i <- 0 until physical_lines.length) {
       
   407             if (physical_lines(i) != -1) {
       
   408               val line_range = proper_line_range(start(i), end(i))
       
   409 
       
   410               // gutter icons
       
   411               val icons =
       
   412                 (for (Text.Info(_, Some(icon)) <- // FIXME snapshot.cumulate
       
   413                   snapshot.select_markup(line_range)(Isabelle_Markup.gutter_message).iterator)
       
   414                 yield icon).toList.sortWith(_ >= _)
       
   415               icons match {
       
   416                 case icon :: _ =>
       
   417                   val icn = icon.icon
       
   418                   val x0 = (FOLD_MARKER_SIZE + width - border_width - icn.getIconWidth) max 10
       
   419                   val y0 = y + i * line_height + (((line_height - icn.getIconHeight) / 2) max 0)
       
   420                   icn.paintIcon(gutter, gfx, x0, y0)
       
   421                 case Nil =>
       
   422               }
       
   423             }
       
   424           }
       
   425         }
       
   426       }
       
   427     }
       
   428   }
       
   429 
       
   430 
       
   431   /* caret handling */
       
   432 
       
   433   def selected_command(): Option[Command] =
       
   434   {
       
   435     Swing_Thread.require()
       
   436     model.snapshot().node.proper_command_at(text_area.getCaretPosition)
       
   437   }
       
   438 
       
   439   private val caret_listener = new CaretListener {
       
   440     private val delay = Swing_Thread.delay_last(session.input_delay) {
       
   441       session.perspective.event(Session.Perspective)
       
   442     }
       
   443     override def caretUpdate(e: CaretEvent) { delay() }
       
   444   }
       
   445 
       
   446 
       
   447   /* overview of command status left of scrollbar */
       
   448 
       
   449   private val overview = new JPanel(new BorderLayout)
       
   450   {
       
   451     private val WIDTH = 10
       
   452     private val HEIGHT = 2
       
   453 
       
   454     setPreferredSize(new Dimension(WIDTH, 0))
       
   455 
       
   456     setRequestFocusEnabled(false)
       
   457 
       
   458     addMouseListener(new MouseAdapter {
       
   459       override def mousePressed(event: MouseEvent) {
       
   460         val line = y_to_line(event.getY)
       
   461         if (line >= 0 && line < text_area.getLineCount)
       
   462           text_area.setCaretPosition(text_area.getLineStartOffset(line))
       
   463       }
       
   464     })
       
   465 
       
   466     override def addNotify() {
       
   467       super.addNotify()
       
   468       ToolTipManager.sharedInstance.registerComponent(this)
       
   469     }
       
   470 
       
   471     override def removeNotify() {
       
   472       ToolTipManager.sharedInstance.unregisterComponent(this)
       
   473       super.removeNotify
       
   474     }
       
   475 
       
   476     override def paintComponent(gfx: Graphics)
       
   477     {
       
   478       super.paintComponent(gfx)
       
   479       Swing_Thread.assert()
       
   480 
       
   481       val buffer = model.buffer
       
   482       Isabelle.buffer_lock(buffer) {
       
   483         val snapshot = model.snapshot()
       
   484 
       
   485         def line_range(command: Command, start: Text.Offset): Option[(Int, Int)] =
       
   486         {
       
   487           try {
       
   488             val line1 = buffer.getLineOfOffset(snapshot.convert(start))
       
   489             val line2 = buffer.getLineOfOffset(snapshot.convert(start + command.length)) + 1
       
   490             Some((line1, line2))
       
   491           }
       
   492           catch { case e: ArrayIndexOutOfBoundsException => None }
       
   493         }
       
   494         for {
       
   495           (command, start) <- snapshot.node.command_starts
       
   496           if !command.is_ignored
       
   497           (line1, line2) <- line_range(command, start)
       
   498           val y = line_to_y(line1)
       
   499           val height = HEIGHT * (line2 - line1)
       
   500           color <- Isabelle_Markup.overview_color(snapshot, command)
       
   501         } {
       
   502           gfx.setColor(color)
       
   503           gfx.fillRect(0, y, getWidth - 1, height)
       
   504         }
       
   505       }
       
   506     }
       
   507 
       
   508     private def line_to_y(line: Int): Int =
       
   509       (line * getHeight) / (text_area.getBuffer.getLineCount max text_area.getVisibleLines)
       
   510 
       
   511     private def y_to_line(y: Int): Int =
       
   512       (y * (text_area.getBuffer.getLineCount max text_area.getVisibleLines)) / getHeight
       
   513   }
       
   514 
       
   515 
       
   516   /* main actor */
       
   517 
       
   518   private val main_actor = actor {
       
   519     loop {
       
   520       react {
       
   521         case Session.Commands_Changed(changed) =>
       
   522           val buffer = model.buffer
       
   523           Isabelle.swing_buffer_lock(buffer) {
       
   524             val snapshot = model.snapshot()
       
   525 
       
   526             if (changed.exists(snapshot.node.commands.contains))
       
   527               overview.repaint()
       
   528 
       
   529             val visible_range = screen_lines_range()
       
   530             val visible_cmds = snapshot.node.command_range(snapshot.revert(visible_range)).map(_._1)
       
   531             if (visible_cmds.exists(changed)) {
       
   532               for {
       
   533                 line <- 0 until text_area.getVisibleLines
       
   534                 val start = text_area.getScreenLineStartOffset(line) if start >= 0
       
   535                 val end = text_area.getScreenLineEndOffset(line) if end >= 0
       
   536                 val range = proper_line_range(start, end)
       
   537                 val line_cmds = snapshot.node.command_range(snapshot.revert(range)).map(_._1)
       
   538                 if line_cmds.exists(changed)
       
   539               } text_area.invalidateScreenLineRange(line, line)
       
   540 
       
   541               // FIXME danger of deadlock!?
       
   542               // FIXME potentially slow!?
       
   543               model.buffer.propertiesChanged()
       
   544             }
       
   545           }
       
   546 
       
   547         case Session.Global_Settings => html_panel_resize()
       
   548 
       
   549         case bad => System.err.println("command_change_actor: ignoring bad message " + bad)
       
   550       }
       
   551     }
       
   552   }
       
   553 
       
   554 
       
   555   /* activation */
       
   556 
       
   557   private def activate()
       
   558   {
       
   559     val painter = text_area.getPainter
       
   560     painter.addExtension(TextAreaPainter.LINE_BACKGROUND_LAYER + 1, background_painter)
       
   561     painter.addExtension(TextAreaPainter.TEXT_LAYER + 1, text_painter)
       
   562     text_area.getGutter.addExtension(gutter_painter)
       
   563     text_area.addFocusListener(focus_listener)
       
   564     text_area.getView.addWindowListener(window_listener)
       
   565     painter.addMouseMotionListener(mouse_motion_listener)
       
   566     text_area.addCaretListener(caret_listener)
       
   567     text_area.addLeftOfScrollBar(overview)
       
   568     session.commands_changed += main_actor
       
   569     session.global_settings += main_actor
       
   570   }
       
   571 
       
   572   private def deactivate()
       
   573   {
       
   574     val painter = text_area.getPainter
       
   575     session.commands_changed -= main_actor
       
   576     session.global_settings -= main_actor
       
   577     text_area.removeFocusListener(focus_listener)
       
   578     text_area.getView.removeWindowListener(window_listener)
       
   579     painter.removeMouseMotionListener(mouse_motion_listener)
       
   580     text_area.removeCaretListener(caret_listener)
       
   581     text_area.removeLeftOfScrollBar(overview)
       
   582     text_area.getGutter.removeExtension(gutter_painter)
       
   583     painter.removeExtension(text_painter)
       
   584     painter.removeExtension(background_painter)
       
   585     exit_popup()
       
   586   }
       
   587 }