Tooltip constructor cannot be resolved

[kineticz]

Here is the code:

/*
 * Copyright 2013 ScalaFX Project
 * All right reserved.
 */
package scalafx.ensemble.example.charts

import scalafx.application.JFXApp
import scalafx.scene.Scene
import scalafx.scene.chart.PieChart
import scalafx.scene.control.Tooltip
import scala.collection.JavaConversions._


object BasicPie extends JFXApp {

  stage = new JFXApp.PrimaryStage {
    title = "Pie Chart Example"
    scene = new Scene {
      val pie: PieChart = new PieChart {
        data = Seq(
          PieChart.Data("Sun", 20),
          PieChart.Data("IBM", 12),
          PieChart.Data("HP", 25),
          PieChart.Data("Dell", 22),
          PieChart.Data("Apple", 30)
        )
        clockwise = false
      }
      root = pie
      val total = pie.getData.foldLeft(0.0) {
        (x, y) => x + y.getPieValue
      }
      pie.getData.foreach(
        d => {
          val sliceNode = d.getNode
          val pieValue: Double = d.getPieValue
          val percent = (pieValue / total) * 100
          val msg = "%s: %.2f (%.2f%%)".format(d.getName, pieValue, percent)
          val tt = new Tooltip()
          tt.setText(msg)
          tt.setStyle("-fx-background-color: yellow; " +
            "-fx-text-fill: black; ")
          Tooltip.install(sliceNode, tt)
        }
      )
    }
  }
}

Note that I have used Tooltip() instead of Tooltip(msg) because the latter would cause an type-mismatch error in intellij. Is this a bug?

[jpsacha]

I would consider it a usability bug since looking at JavaFX documentation you can see there Tooltip constructor that takes String as an argument. The problem is that user would expect to have the same constructor in ScalaFX.

I think that person writing that Tooltip wrapper for ScaleFX assumed that it will be used in to forms. One if you just want a tooltip quickly:

val tt = Tooltip("some message")

Notice that there is no new, so it is the shortest way to write it. It is using apply factory method.
Second form for when you want to customize it (like changing style):

val tt = new Tooltip {
  text = "some message"
  style = "-fx-background-color: yellow; -fx-text-fill: black;"
}

I think that not having a Tooltip with String constructor was a deliberate choice at the time to avoid duplication (since there is already apply factory method that creates Tooltip from String). This applies also to may other wrappers.

For usability sake and to reduce confusion of users converting code directly from Java, this constructor should be added.

[jpsacha]

The constructor was added to Tooltip. Please report if you see the same problem in other places.

[Hungreeee]

I was having the exact same bug. Somehow my Tooltip.install(sliceNode, tt) does not recognize d.getNode as a Node

[jpsacha]

Here is an updated version of the code from original post, updated to work with recent versions of ScalaFX and Scala:

package issues.issue210

import scalafx.Includes._
import scalafx.application.JFXApp3
import scalafx.scene.chart.PieChart
import scalafx.scene.control.Tooltip
import scalafx.scene.{Node, Scene}

object BasicPie extends JFXApp3 {

  override def start(): Unit = {

    val pie = new PieChart {
      data = Seq(
        PieChart.Data("Sun", 20),
        PieChart.Data("IBM", 12),
        PieChart.Data("HP", 25),
        PieChart.Data("Dell", 22),
        PieChart.Data("Apple", 30)
      )
      clockwise = false
    }

    val total = pie.data().foldLeft(0.0) { (x, y) => x + y.pieValue() }

    pie.data().foreach { d =>
      val sliceNode: Node  = d.node()
      val pieValue: Double = d.pieValue()
      val percent          = (pieValue / total) * 100
      val msg              = f"${d.name()}: $pieValue%.2f ($percent%.2f%%)"
      val tt = new Tooltip {
        text = msg
        style = "-fx-background-color: yellow; -fx-text-fill: black; "
      }
      Tooltip.install(sliceNode, tt)
    }

    stage = new JFXApp3.PrimaryStage {
      title = "Pie Chart Example"
      scene = new Scene {
        root = pie
      }
    }
  }
}

Note the lines:

val sliceNode: Node  = d.node()

This way we ensure that arguments to Tooltip.install(sliceNode, tt) are both ScalaFX types. This will avoid problem mentioned in issue #378