Scala表（JTable）IndexOutOfBoundException由CellEditor的错误索引产生

Question

我刚刚遇到一个奇怪的问题，其中IndexOutOfBoundException引发AbstractCellEditor导致Exception尝试索引不存在的行。删除最后一行后出现问题。删除最后一行后，每次可能点击该表都会抛出相同的Exception，直到添加新行。我真的不知道为什么会这样。

在下文中，陈述了scala和产生异常的小Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException: 4 >= 4 at java.util.Vector.elementAt(Unknown Source) at javax.swing.table.DefaultTableModel.setValueAt(Unknown Source) at javax.swing.JTable.setValueAt(Unknown Source) at javax.swing.JTable.editingStopped(Unknown Source) at javax.swing.AbstractCellEditor.fireEditingStopped(Unknown Source) at javax.swing.AbstractCellEditor.stopCellEditing(Unknown Source) at javax.swing.plaf.basic.BasicTableUI$Handler.mousePressed(Unknown Source) at java.awt.AWTEventMulticaster.mousePressed(Unknown Source) at java.awt.Component.processMouseEvent(Unknown Source) at javax.swing.JComponent.processMouseEvent(Unknown Source) at java.awt.Component.processEvent(Unknown Source) at java.awt.Container.processEvent(Unknown Source) at java.awt.Component.dispatchEventImpl(Unknown Source) at java.awt.Container.dispatchEventImpl(Unknown Source) at java.awt.Component.dispatchEvent(Unknown Source) at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source) at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source) at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source) at java.awt.Container.dispatchEventImpl(Unknown Source) at java.awt.Window.dispatchEventImpl(Unknown Source) at java.awt.Component.dispatchEvent(Unknown Source) at java.awt.EventQueue.dispatchEventImpl(Unknown Source) at java.awt.EventQueue.access$400(Unknown Source) at java.awt.EventQueue$3.run(Unknown Source) at java.awt.EventQueue$3.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source) at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source) at java.awt.EventQueue$4.run(Unknown Source) at java.awt.EventQueue$4.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source) at java.awt.EventQueue.dispatchEvent(Unknown Source) at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source) at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source) at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source) at java.awt.EventDispatchThread.pumpEvents(Unknown Source) at java.awt.EventDispatchThread.pumpEvents(Unknown Source) at java.awt.EventDispatchThread.run(Unknown Source) 示例：

package test.TableTest

import scala.swing.BorderPanel
import scala.swing.BorderPanel.Position.Center
import scala.swing.MainFrame
import scala.swing.ScrollPane
import java.awt.BorderLayout
import java.awt.Dimension
import scala.swing.GridBagPanel
import scala.swing.TextField
import scala.swing.Button
import scala.swing.Table
import java.awt.GridBagConstraints._
import java.awt.Color
import java.awt.Dimension
import javax.swing.table.DefaultTableModel
import scala.collection.mutable.ListBuffer
import scala.swing.Table.AbstractRenderer
import javax.swing.Icon
import javax.swing.ImageIcon
import scala.swing.event.ButtonClicked
import javax.swing.BorderFactory
import javax.swing.AbstractCellEditor
import javax.swing.table.TableCellEditor
import scala.swing.Label
import javax.swing.JTable
import java.awt.{ Component => AWTComponent }
import java.util.EventObject
import scala.swing.SimpleSwingApplication

object TableTest extends SimpleSwingApplication {
  setSystemLookAndFeel()
  def top = new MainFrame {
    val trackingControl = new TrackingControl
    this.title_=("Table IndexOutOfBound-Example")

    val components = new BorderPanel {
      import BorderPanel.Position._
      add(trackingControl, Center)
    }

    this.contents_=(components)
    this.preferredSize = new Dimension(300,600)
    this.pack
  }
  def setSystemLookAndFeel() {
    import javax.swing.UIManager
    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName)
  }
}

class TrackingControl extends GridBagPanel {

  val searchField = new TextField {
    preferredSize_=(new Dimension(200, 22))
  }
  val searchButton = new Button {
    text = "GO"
    reactions += {
      case e: ButtonClicked =>
        if (!searchField.text.isEmpty())
          fireAddToQuery(searchField.text)
    }
  }
  val queryTable = new Table {
    private val buttonRenderer = new AbstractRenderer[Any, Label](new Label) {
      override def configure(table: Table, isSelected: Boolean, hasFocus: Boolean, a: Any, row: Int, column: Int) {
        component.text = "Del"
      }
    }

    private val buttonEditor = new AbstractCellEditor with TableCellEditor {
      val label = new Label
      label.text = "Del"

      override def getCellEditorValue: AnyRef = "Del"
      override def getTableCellEditorComponent(tab: JTable, value: AnyRef, isSelected: Boolean,
        row: Int, col: Int): AWTComponent = {
        fireRemoveFromQuery(row)
        label.peer
      }
    }

    model = new DefaultTableModel(Array[Object]("Tag", "Delete"), 0)
    showGrid = false
    peer.getTableHeader().disable()
    peer.getColumnModel().getColumn(1).setMaxWidth(searchButton.preferredSize.width)
    peer.getColumnModel().getColumn(1).setMinWidth(searchButton.preferredSize.width)

    override def rendererComponent(isSelected: Boolean, focused: Boolean, row: Int, column: Int) = {
      column match {
        case 1 => buttonRenderer.componentFor(this, isSelected, hasFocus, null, row, column)
        case _ => super.rendererComponent(isSelected, focused, row, column)
      }
    }

    override def editor(row: Int, column: Int) = {
      column match {
        case 1 => buttonEditor
        case _ => null
      }
    }
  }

  add(searchField, constraints(0, 0, anchor = GridBagPanel.Anchor.NorthWest))
  add(searchButton, constraints(1, 0, anchor = GridBagPanel.Anchor.NorthEast))
  add(queryTable, constraints(0, 1, gridwidth = 2, fill = GridBagPanel.Fill.Both, weighty = 1))

  def fireAddToQuery(tag: String): Unit = {
    queryTable.model.asInstanceOf[DefaultTableModel].addRow(Array[Object](tag))
  }

  def fireRemoveFromQuery(row: Int): Unit = {
    queryTable.model.asInstanceOf[DefaultTableModel].removeRow(row)
  }

  def constraints(x: Int, y: Int,
    gridwidth: Int = 1, gridheight: Int = 1,
    weightx: Double = 0.0, weighty: Double = 0.0,
    fill: GridBagPanel.Fill.Value = GridBagPanel.Fill.None,
    anchor: GridBagPanel.Anchor.Value = GridBagPanel.Anchor.Center): Constraints = {
    val c = new Constraints
    c.gridx = x
    c.gridy = y
    c.gridwidth = gridwidth
    c.gridheight = gridheight
    c.weightx = weightx
    c.weighty = weighty
    c.fill = fill
    c.anchor = anchor
    c
  }
}

代码：

{{1}}

点击＆＃34; Del＆＃34;可以删除一行。在第二栏。

你有什么想法导致这个索引错误吗？

Answer 1

我弄清楚问题是什么。

在

   override def getTableCellEditorComponent(tab: JTable, value: AnyRef, isSelected: Boolean,
        row: Int, col: Int): AWTComponent = {
        fireRemoveFromQuery(row)
        label.peer
      }

我在编辑处于活动状态时删除了该行。我必须在删除行之前取消编辑。

这是表格的剪裁工作：

  val queryTable = new Table {
    model = new DefaultTableModel(Array[Object]("Tag", "Delete"), 0)
    showGrid = false
    peer.getTableHeader().disable()
    peer.getColumnModel().getColumn(1).setMaxWidth(searchButton.preferredSize.width)
    peer.getColumnModel().getColumn(1).setMinWidth(searchButton.preferredSize.width)

    val buttonEditor = new AbstractCellEditor with TableCellEditor {
      var curRow = 0
      val button = new Button
      button.text= "Del"
      button.peer.setBorderPainted(false)
      button.peer.setContentAreaFilled(false)
      button.peer.setOpaque(false)

      listenTo(button)
      reactions += {
        case e: ButtonClicked => {
          cancelCellEditing()
          fireRemoveFromQuery(curRow)
        }
      }

      override def isCellEditable(arg0: EventObject) = true
      override def getCellEditorValue() = "Del"
      override def getTableCellEditorComponent(arg0: JTable, arg1: Any, arg2: Boolean, row: Int, col: Int) = {
        curRow = row
        button.peer
      }
    }
    override def editor(row: Int, column: Int) = {
      column match {
        case 1 => buttonEditor
        case _ => null
      }
    }
  }