如何在 scala.swing.Table 中添加 ComboBox 作为单元格编辑器？

Question

我正在尝试为 Scala Swing 应用程序的第二列中的每个单元格添加 ComboBox 作为列单元格编辑器，但很难做到。下面的代码显示了我到目前为止所做的尝试，请帮助我更改代码以完成任务。

import swing._
import javax.swing.JComboBox
import javax.swing.table.AbstractTableModel
import javax.swing.DefaultCellEditor

//////////////////////////////////////////////////////////////////////////////////////////////////
class MyModel(var cells: Array[Array[Any]], val columns: Array[Any] ) extends AbstractTableModel {
  def getRowCount(): Int = cells.length

  def getColumnCount(): Int = columns.length

  def getValueAt(row: Int, col: Int): AnyRef = cells(row)(col).asInstanceOf[AnyRef]

  override def getColumnClass(column: Int) = getValueAt(0, column).getClass

  override def isCellEditable(row: Int, column: Int) = if (column == 0) false else true

  override def setValueAt(value: Any, row: Int, col: Int) {
    cells(row)(col) = value
    fireTableCellUpdated(row, col)
  }

  override def getColumnName(column: Int): String = columns(column).toString
}

//////////////////////////////////////////////////////////////////////////////////////////////////
class TestTable extends ScrollPane {
  final val columns: Array[Any] = Array[Any]( "Column1", "Column2" )

  final val Col1Data: Array[Any] = Array[Any]( "Col1_Data",
      "Col2_Data", "Col3_Data", "Col4_Data", "Col5_Data", "Col6_Data"
  )

  var modelarr = Array.ofDim[Any](Col1Data.length, columns.length)

  for (i <- 0 until Col1Data.length) {
    modelarr(i)(0) = Col1Data(i)
    // Have tried to set it to 1/"Value2"
    modelarr(i)(1) = "Value2"
  }

  val table = new Table( modelarr, columns ) {

    val mymodel = new MyModel(modelarr, columns)
    model = mymodel

    val Col1 = peer.getColumnModel.getColumn( 1 )
    val cb = new JComboBox[String](Array("Value1", "Value2", "Value3"))
    Col1.setCellEditor( new DefaultCellEditor( cb ) )
  }

  viewportView = table
}

//////////////////////////////////////////////////////////////////////////////////////////////////
object MyCombo extends SimpleSwingApplication {

  override def main(args: Array[String]) = super.main(args)

  var mytable = new TestTable

  def top = new MainFrame {
    title = "Table Test"
    contents = mytable
  }
}

更新：

刚发现类似问题：How to embed a (working) Button in a Swing Table in Scala?将尝试建议的方法。

Answer 1

感谢 Nickal 的提示。我自己的解决方案是原始代码的修改版本，并仅在此处发布更改。

修改后的导入块：

import scala.swing._
import scala.swing.Swing._
import javax.swing._
import javax.swing.table.{TableCellEditor, AbstractTableModel}
import java.awt.{Component => AWTComponent}

添加了两个特征以能够在新的 class 中混合 java classes：

//////////////////////////////////////////////////////////////////////////////////////////////////
trait AbstractCellEditorTrait extends AbstractCellEditor

//////////////////////////////////////////////////////////////////////////////////////////////////
trait TableCellEditorTrait extends TableCellEditor

//////////////////////////////////////////////////////////////////////////////////////////////////
class comboboxEditor(val currentValue: AnyRef) extends AbstractCellEditorTrait with TableCellEditorTrait {
  private val cb  = new ComboBox(Array("Value1", "Value2", "Value3"))
  cb.selection.item = currentValue.toString

  def getCellEditorValue: AnyRef = cb.selection.item.asInstanceOf[AnyRef]

  def getTableCellEditorComponent(tab: JTable, value: AnyRef, isSelected: Boolean, row: Int, col: Int): AWTComponent = {
    cb.peer.asInstanceOf[AWTComponent]
  }
}

修改代码，在 TestTable class 中设置单元格编辑器（以 val Col1 = peer.g 开头的 3 行代码替换为以下代码）：

  override def editor(row: Int, col: Int): TableCellEditor = {
    if (col == 1) 
      new comboboxEditor(mymodel.getValueAt(row, col))
    else 
      super.editor(row, col)
    }

Answer 2

基于e_z的代码，我为通用代码分离出一个BaseEditor摘要class，因为最终我需要还实施 isCellEditable。在 BaseEditor 的 sub-class 中，您需要一个 editor 的实例，它是您的组件并实现 getCellEditorValue.

  abstract class BaseEditor extends AbstractCellEditor with TableCellEditor {
    protected val editor: Component  // scala.swing.Component

    override def isCellEditable(e: EventObject): Boolean= {
      if (super.isCellEditable(e)) {
        e match {
          case me: java.awt.event.MouseEvent => me.getClickCount >= 2
          case ke: java.awt.event.KeyEvent => 
            // F2 not working, for some reason keypress arrives as ActionEvent
            ke.getKeyCode == java.awt.event.KeyEvent.VK_F2  
          case ae: java.awt.event.ActionEvent => false // ignore for now
          case x => false  // otherwise ignore
        }
      } else false
    }

    def getTableCellEditorComponent(table: JTable, value: AnyRef,
                                    selected: Boolean, row: Int, col: Int): AWTComponent= {
      editor.peer.asInstanceOf[AWTComponent]
    }

  }

  // example extending BaseEditor and custom StringData object
  case class StringData(s: String)
  class TextFieldEditor(current: StringData) extends BaseEditor {
    protected val editor= new TextField(current.s)

    def getCellEditorValue: AnyRef= StringData(editor.text)
  }

如何在 scala.swing.Table 中添加 ComboBox 作为单元格编辑器？

How to add ComboBox as a cell editor in scala.swing.Table?

swing

scala

jtable

jcombobox

scala-swing