Question

我对swing和scala都很陌生，但是我想在scala.swing.Table中单击一列时捕获，我一直无法弄清楚如何执行此操作。可以在scala中完成吗？我仍在学习如何阅读scala API，因此任何见解都会有所帮助，

Answer 1

看起来Scala Swing还不支持表头事件，因此您可能需要执行以下操作，将鼠标侦听器直接添加到 JTableHeader 。

我确信有一种优雅的方法可以创建一个 scala.swing.Publisher 来将监听器与 listenTo 和反应集成在一起机制，这取决于是否值得额外的努力。

import java.awt.Dimension

import java.awt.event.{MouseEvent, MouseAdapter}
import swing._
import event.TableColumnsSelected

object TableQuestion extends SimpleSwingApplication {
  val headers = Array.tabulate(10){"Col-"+_}.toSeq
  val rowData = Array.tabulate[Any](10, 10){""+_+":"+_}

  lazy val ui = new BoxPanel(Orientation.Vertical) {
    val table  = new Table(rowData, headers)
    val label  = new Label("")
    val header = table.peer.getTableHeader()

    header.addMouseListener(new MouseAdapter() {
      override def mouseClicked(e: MouseEvent) {
        val col = header.columnAtPoint(e.getPoint())

        label.text = "Column header "+col+" selected"
      }
    })    

    listenTo(table.selection)

    reactions += {
      case TableColumnsSelected(_, r, _) =>
        label.text = "Column "+table.selection.columns.leadIndex+" selected, range = "+r
    }
    contents  += new ScrollPane(table)
    contents  += label
  }

  def top = new MainFrame {
    title         = "Table Column Selection"
    preferredSize = new Dimension(400, 260)
    contents      = ui
  }
}

此外，我发现TableColumnSelected事件提供的范围信息相当奇怪，它包含从当前点击到另一列中的上一次点击的连续列索引。也许我错过了一些原因。

Answer 2

我能够以Don Mackenzie为例，使用Publisher和Reactor生成一些东西。

import java.awt.event.{MouseEvent, MouseAdapter}
import javax.swing.UIManager
import swing._
import event.TableEvent

object TableQuestion extends SimpleSwingApplication
{
  val headers = Array.tabulate(10) {"Col-" + _}.toSeq
  val rowData = Array.tabulate[Any](10, 10) {"" + _ + ":" + _}

  lazy val ui = new BoxPanel(Orientation.Vertical) {
  val table = new Table(rowData, headers)
  val label = new Label("")
  val header = table.peer.getTableHeader()

  header.addMouseListener(new MouseAdapter() {
    override def mouseClicked(e: MouseEvent) {
       publish(ColumnHeaderClicked(table, header.columnAtPoint(e.getPoint())))
    }
  })

  listenTo(table)

  reactions += {
    case ColumnHeaderClicked(_, column) => label.text = "Column header " + column + " selected"
  }
  contents += new ScrollPane(table)
  contents += label
}

  UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName);
  def top = new MainFrame {
    title = "Table Column Selection"
    preferredSize = new Dimension(400, 260)
    contents = ui
  }
}   

case class ColumnHeaderClicked(override val source: Table, column: Int) extends TableEvent(source)

Answer 3

请不要编写自己的表排序实现 - 请改用GlazedLists。你会感谢我的。您可能需要使用标准的JTable而不是swing.Table，但它可以处理您将要做的所有排序和过滤。

Scala摆动表 - 捕获列点击

3 个答案: