src/Tools/jEdit/src/completion_popup.scala
author wenzelm
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/*  Title:      Tools/jEdit/src/completion_popup.scala
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    Author:     Makarius
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Completion popup.
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*/
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package isabelle.jedit
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import isabelle._
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import java.awt.{Color, Font, Point, BorderLayout, Dimension}
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import java.awt.event.{InputEvent, KeyEvent, MouseEvent, MouseAdapter, FocusAdapter, FocusEvent}
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import javax.swing.{JPanel, JComponent, JLayeredPane, SwingUtilities}
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import javax.swing.border.LineBorder
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import scala.swing.{ListView, ScrollPane}
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import scala.swing.event.MouseClicked
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import org.gjt.sp.jedit.{View, Debug}
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import org.gjt.sp.jedit.textarea.JEditTextArea
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object Completion_Popup
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{
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  /* setup for jEdit text area */
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  object Text_Area
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  {
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    private val key = new Object
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    def apply(text_area: JEditTextArea): Option[Completion_Popup.Text_Area] =
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      text_area.getClientProperty(key) match {
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        case text_area_completion: Completion_Popup.Text_Area => Some(text_area_completion)
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        case _ => None
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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(text_area_completion) =>
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          text_area_completion.deactivate()
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          text_area.putClientProperty(key, null)
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      }
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    }
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    def init(text_area: JEditTextArea): Completion_Popup.Text_Area =
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    {
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      exit(text_area)
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      val text_area_completion = new Text_Area(text_area)
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      text_area.putClientProperty(key, text_area_completion)
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      text_area_completion.activate()
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      text_area_completion
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    }
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    def dismissed(text_area: JEditTextArea): Boolean =
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    {
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      Swing_Thread.require()
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      apply(text_area) match {
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        case Some(text_area_completion) => text_area_completion.dismissed()
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        case None => false
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      }
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    }
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  }
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  class Text_Area private(text_area: JEditTextArea)
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  {
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    private var completion_popup: Option[Completion_Popup] = None
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    /* completion action */
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    private def insert(item: Completion.Item)
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    {
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      Swing_Thread.require()
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      val buffer = text_area.getBuffer
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      val len = item.original.length
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      if (buffer.isEditable && len > 0) {
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        JEdit_Lib.buffer_edit(buffer) {
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          val caret = text_area.getCaretPosition
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          JEdit_Lib.try_get_text(buffer, Text.Range(caret - len, caret)) match {
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            case Some(text) if text == item.original =>
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              buffer.remove(caret - len, len)
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              buffer.insert(caret - len, item.replacement)
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            case _ =>
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          }
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        }
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      }
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    }
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    def action(immediate: Boolean)
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    {
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      val view = text_area.getView
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      val layered = view.getLayeredPane
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      val buffer = text_area.getBuffer
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      val painter = text_area.getPainter
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      if (buffer.isEditable) {
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        Isabelle.mode_syntax(JEdit_Lib.buffer_mode(buffer)) match {
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          case Some(syntax) =>
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            val caret = text_area.getCaretPosition
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            val line = buffer.getLineOfOffset(caret)
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            val start = buffer.getLineStartOffset(line)
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            val text = buffer.getSegment(start, caret - start)
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            syntax.completion.complete(Isabelle_Encoding.is_active(buffer), text) match {
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              case Some((_, List(item))) if item.immediate && immediate =>
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                insert(item)
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              case Some((original, items)) =>
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                val font =
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                  painter.getFont.deriveFont(Rendering.font_size("jedit_popup_font_scale"))
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                val loc1 = text_area.offsetToXY(caret - original.length)
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                if (loc1 != null) {
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                  val loc2 =
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                    SwingUtilities.convertPoint(painter,
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                      loc1.x, loc1.y + painter.getFontMetrics.getHeight, layered)
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                  val completion =
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                    new Completion_Popup(layered, loc2, font, items) {
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                      override def complete(item: Completion.Item) { insert(item) }
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                      override def propagate(evt: KeyEvent) {
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                        JEdit_Lib.propagate_key(view, evt)
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                        input(evt)
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                      }
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                      override def refocus() { text_area.requestFocus }
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                    }
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                  completion_popup = Some(completion)
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                  completion.show_popup()
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                }
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              case None =>
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            }
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          case None =>
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        }
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      }
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    }
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    /* input key events */
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    def input(evt: KeyEvent)
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    {
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      Swing_Thread.require()
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      if (PIDE.options.bool("jedit_completion")) {
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        if (!evt.isConsumed) {
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          dismissed()
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          val mod = evt.getModifiers
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          val special =
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            evt.getKeyChar == '\b' ||
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            // cf. 5.1.0/jEdit/org/gjt/sp/jedit/gui/KeyEventWorkaround.java
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            (mod & InputEvent.CTRL_MASK) != 0 && (mod & InputEvent.ALT_MASK) == 0 ||
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            (mod & InputEvent.CTRL_MASK) == 0 && (mod & InputEvent.ALT_MASK) != 0 &&
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              !Debug.ALT_KEY_PRESSED_DISABLED ||
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            (mod & InputEvent.META_MASK) != 0
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          if (PIDE.options.seconds("jedit_completion_delay").is_zero && !special) {
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            input_delay.revoke()
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            action(PIDE.options.bool("jedit_completion_immediate"))
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          }
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          else input_delay.invoke()
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        }
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      }
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    }
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    private val input_delay =
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      Swing_Thread.delay_last(PIDE.options.seconds("jedit_completion_delay")) {
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        action(false)
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      }
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    /* dismiss popup */
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    def dismissed(): Boolean =
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    {
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      Swing_Thread.require()
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      completion_popup match {
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        case Some(completion) =>
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          completion.hide_popup()
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          completion_popup = None
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          true
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        case None =>
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          false
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      }
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    }
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    /* activation */
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    private val outer_key_listener =
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      JEdit_Lib.key_listener(key_typed = input _)
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    private def activate()
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    {
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      text_area.addKeyListener(outer_key_listener)
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    }
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    private def deactivate()
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    {
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      dismissed()
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      text_area.removeKeyListener(outer_key_listener)
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    }
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  }
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}
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class Completion_Popup private(
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  layered: JLayeredPane,
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  location: Point,
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  font: Font,
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  items: List[Completion.Item]) extends JPanel(new BorderLayout)
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{
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  completion =>
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  Swing_Thread.require()
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  require(!items.isEmpty)
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  /* actions */
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  def complete(item: Completion.Item) { }
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  def propagate(evt: KeyEvent) { }
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  def refocus() { }
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  /* list view */
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  private val list_view = new ListView(items)
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  list_view.font = font
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  list_view.selection.intervalMode = ListView.IntervalMode.Single
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  list_view.peer.setFocusTraversalKeysEnabled(false)
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  list_view.peer.setVisibleRowCount(items.length min 8)
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  list_view.peer.setSelectedIndex(0)
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  private def complete_selected(): Boolean =
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  {
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    list_view.selection.items.toList match {
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      case item :: _ => complete(item); true
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      case _ => false
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    }
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  }
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  private def move_items(n: Int)
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  {
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    val i = list_view.peer.getSelectedIndex
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    val j = ((i + n) min (items.length - 1)) max 0
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    if (i != j) {
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      list_view.peer.setSelectedIndex(j)
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      list_view.peer.ensureIndexIsVisible(j)
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    }
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  }
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  private def move_pages(n: Int)
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  {
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    val page_size = list_view.peer.getVisibleRowCount - 1
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    move_items(page_size * n)
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  }
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  /* event handling */
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  private val inner_key_listener =
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    JEdit_Lib.key_listener(
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      key_pressed = (e: KeyEvent) =>
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        {
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          if (!e.isConsumed) {
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            e.getKeyCode match {
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              case KeyEvent.VK_TAB =>
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                if (complete_selected()) e.consume
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                hide_popup()
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              case KeyEvent.VK_ESCAPE =>
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                hide_popup()
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                e.consume
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              case KeyEvent.VK_UP => move_items(-1); e.consume
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              case KeyEvent.VK_DOWN => move_items(1); e.consume
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              case KeyEvent.VK_PAGE_UP => move_pages(-1); e.consume
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              case KeyEvent.VK_PAGE_DOWN => move_pages(1); e.consume
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              case _ =>
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                if (e.isActionKey || e.isAltDown || e.isMetaDown || e.isControlDown)
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                  hide_popup()
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            }
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          }
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          propagate(e)
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        },
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      key_typed = propagate _
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    )
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  list_view.peer.addKeyListener(inner_key_listener)
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  list_view.peer.addMouseListener(new MouseAdapter {
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    override def mouseClicked(e: MouseEvent) {
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      if (complete_selected()) e.consume
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      hide_popup()
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    }
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  })
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  list_view.peer.addFocusListener(new FocusAdapter {
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    override def focusLost(e: FocusEvent) { hide_popup() }
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  })
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  /* main content */
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  override def getFocusTraversalKeysEnabled = false
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  completion.setBorder(new LineBorder(Color.BLACK))
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  completion.add((new ScrollPane(list_view)).peer.asInstanceOf[JComponent])
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  /* popup */
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  private val popup =
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  {
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    val screen = JEdit_Lib.screen_location(layered, location)
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    val size =
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    {
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      val geometry = JEdit_Lib.window_geometry(completion, completion)
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      val bounds = Rendering.popup_bounds
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      val w = geometry.width min (screen.bounds.width * bounds).toInt min layered.getWidth
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      val h = geometry.height min (screen.bounds.height * bounds).toInt min layered.getHeight
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      new Dimension(w, h)
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    }
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    new Popup(layered, completion, screen.relative(layered, size), size)
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  }
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  private def show_popup()
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  {
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    popup.show
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    list_view.requestFocus
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  }
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  private def hide_popup()
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  {
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    val had_focus = list_view.peer.isFocusOwner
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    popup.hide
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    if (had_focus) refocus()
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  }
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}
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