src/Tools/jEdit/src/completion_popup.scala
author wenzelm
Tue, 27 Aug 2013 14:56:11 +0200
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parent 53226 9cf8e2263ca7
child 53229 6ce8328d7912
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some key event handling in the manner of SideKickBindings, SideKickCompletionPopup;
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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.{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 apply(
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    opt_view: Option[View],
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    parent: JComponent,
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    screen_point: Point,
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    items: List[Item],
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    complete: Item => Unit): Completion_Popup =
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  {
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    Swing_Thread.require()
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    require(!items.isEmpty)
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    val completion = new Completion_Popup(opt_view, parent, screen_point, items, complete)
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    completion.show_popup()
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    completion
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  }
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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 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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      val token_length = 0
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      val items: List[Item] = Nil
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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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          apply(Some(text_area.getView), painter, location, items, complete _)
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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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  opt_view: Option[View],
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  parent: JComponent,
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  screen_point: Point,
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  items: List[Completion_Popup.Item],
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  complete: Completion_Popup.Item => Unit) extends JPanel(new BorderLayout)
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{
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  completion =>
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  Swing_Thread.require()
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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 = parent.getFont
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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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          if (!e.isConsumed) pass_to_view(e)
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        },
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      key_typed = (e: KeyEvent) =>
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        {
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          if (!e.isConsumed) pass_to_view(e)
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        }
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    )
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  private def pass_to_view(e: KeyEvent)
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  {
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    opt_view match {
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      case Some(view) if view.getKeyEventInterceptor == key_listener =>
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        try {
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          view.setKeyEventInterceptor(null)
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          view.getInputHandler().processKeyEvent(e, View.ACTION_BAR, false)
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        }
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        finally { view.setKeyEventInterceptor(key_listener) }
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      case _ =>
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    }
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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 geometry = JEdit_Lib.window_geometry(completion, completion)
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    val w = geometry.width min (screen_bounds.width / 2)
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    val h = geometry.height min (screen_bounds.height / 2)
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    completion.setSize(new Dimension(w, h))
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    completion.setPreferredSize(new Dimension(w, h))
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    val x = screen_point.x min (screen_bounds.x + screen_bounds.width - w)
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    val y = screen_point.y min (screen_bounds.y + screen_bounds.height - h)
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    PopupFactory.getSharedInstance.getPopup(parent, completion, x, y)
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  }
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  def show_popup()
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  {
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    opt_view.foreach(view => view.setKeyEventInterceptor(key_listener))
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    popup.show
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    list_view.requestFocus
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  }
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  def hide_popup()
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  {
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    opt_view match {
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      case Some(view) =>
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        if (view.getKeyEventInterceptor == key_listener)
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          view.setKeyEventInterceptor(null)
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        popup.hide
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        view.getTextArea match {
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          case null =>
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          case text_area => text_area.requestFocus
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        }
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      case None =>
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        popup.hide
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        parent.requestFocus
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    }
f127e949389f Completion popup based on javax.swing.PopupFactory, which has better cross-platform chances than JWindow (cf. org/gjt/jedit/gui/CompletionPopup.java);
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  }
f127e949389f Completion popup based on javax.swing.PopupFactory, which has better cross-platform chances than JWindow (cf. org/gjt/jedit/gui/CompletionPopup.java);
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}
f127e949389f Completion popup based on javax.swing.PopupFactory, which has better cross-platform chances than JWindow (cf. org/gjt/jedit/gui/CompletionPopup.java);
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