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 based on javax.swing.PopupFactory.
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*/
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package isabelle.jedit
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import isabelle._
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import java.awt.{Font, Point, BorderLayout, Dimension}
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import java.awt.event.{KeyEvent, MouseEvent, MouseAdapter, FocusAdapter, FocusEvent}
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import javax.swing.{JPanel, JComponent, PopupFactory, SwingUtilities}
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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
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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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  sealed case class Item(name: String, text: String)
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  { override def toString: String = text }
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  def input_text_area(text_area: JEditTextArea, evt: KeyEvent)
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  {
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    Swing_Thread.require()
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    val buffer = text_area.getBuffer
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    if (buffer.isEditable) {
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      val view = text_area.getView
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      val painter = text_area.getPainter
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      val caret = text_area.getCaretPosition
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      // FIXME
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      def complete(item: Item) { }
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      // FIXME
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      val token_length = 0
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      val items: List[Item] = Nil
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      val popup_font =
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        painter.getFont.deriveFont(
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          (painter.getFont.getSize2D * PIDE.options.real("jedit_popup_font_scale")).toFloat
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            max 10.0f)
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      if (!items.isEmpty) {
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        val location = text_area.offsetToXY(caret - token_length)
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        if (location != null) {
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          location.y = location.y + painter.getFontMetrics.getHeight
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          SwingUtilities.convertPointToScreen(location, painter)
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          new Completion_Popup(view.getRootPane, popup_font, location, items) {
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            override def propagate(evt: KeyEvent) { JEdit_Lib.propagate_key(view, evt) }
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            override def hidden() { text_area.requestFocus }
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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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class Completion_Popup private(
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  root: JComponent,
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  popup_font: Font,
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  screen_point: Point,
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  items: List[Completion_Popup.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_Popup.Item) { }
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  def propagate(evt: KeyEvent) { }
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  def hidden() { }
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  /* list view */
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  private val list_view = new ListView(items)
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  {
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    font = popup_font
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  }
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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 key_listener =
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    JEdit_Lib.key_listener(
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      workaround = false,
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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(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.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_bounds = JEdit_Lib.screen_bounds(screen_point)
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    val x0 = root.getLocationOnScreen.x
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    val y0 = root.getLocationOnScreen.y
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    val w0 = root.getWidth
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    val h0 = root.getHeight
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    val (w, h) =
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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 w0
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      val h = geometry.height min (screen_bounds.height * bounds).toInt min h0
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      (w, h)
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    }
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    val (x, y) =
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    {
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      val x1 = x0 + w0 - w
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      val y1 = y0 + h0 - h
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      val x2 = screen_point.x min (screen_bounds.x + screen_bounds.width - w)
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      val y2 = screen_point.y min (screen_bounds.y + screen_bounds.height - h)
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      ((x2 min x1) max x0, (y2 min y1) max y0)
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    }
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    completion.setSize(new Dimension(w, h))
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    completion.setPreferredSize(new Dimension(w, h))
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    PopupFactory.getSharedInstance.getPopup(root, completion, x, y)
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  }
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  private def hide_popup()
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  {
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    popup.hide
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    hidden()
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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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