scalafx.animation.Timeline 未按预期工作

Question

几天前我开始试用 ScalaFX API。要了解此 API 的用法，我正在查看 GitHub. For testing out the features of the TimeLine class I used this example: ScalaFXAnimation.

上的示例

示例中定义 TimeLine 对象的代码如下所示：

val timeline = new Timeline {
  cycleCount = Timeline.Indefinite
  autoReverse = true
  keyFrames = Seq(
    at (2 s) {rect1.x -> 200d tween Interpolator.EASE_IN},
    at (4 s) {rect1.x -> 300d},
    at (3 s) {rect2.y -> 100d tween Interpolator.EASE_BOTH},
    at (4 s) {rect2.y -> 300d},
    at (4 s) {rect2.width -> 300d tween Interpolator.EASE_OUT}
  )
}

如果我尝试在自己的项目中执行此操作，我会收到一些编译错误，例如：

Error:(58, 5) not found: value cycleCount

也找不到值 autoReverse、keyFrames 和 s。我没有自己设置项目及其结构，而是从 GitHub: scalafx-hello-world 克隆了一个 "Hello world"-project。此项目并正确编译。

这可能是 ScalaFX 中的错误吗？您有解决这个问题的想法吗？

EDIT2：完整代码

package hello

import scalafx.animation.{Timeline, Interpolator}
import scalafx.application.JFXApp
import scalafx.application.JFXApp.PrimaryStage
import scalafx.scene.Scene
import scalafx.scene.paint.Color
import scalafx.scene.shape.Rectangle
import scalafx.Includes._
import scala.language.postfixOps

object ScalaFXHelloWorld extends JFXApp {

  val rect1 = new Rectangle {
    width = 100
    height = 200
    fill = Color.Red
  }

  val rect2 = new Rectangle {
    width = 200
    height = 120
    fill = Color.Green
  }

  val timeline = Timeline {
    cycleCount = Timeline.Indefinite
    autoReverse = true
    keyFrames = Seq(
      at (2 s) {rect1.x -> 200d tween Interpolator.EASE_IN},
      at (4 s) {rect1.x -> 300d},
      at (3 s) {rect2.y -> 100d tween Interpolator.EASE_BOTH},
      at (4 s) {rect2.y -> 300d},
      at (4 s) {rect2.width -> 300d tween Interpolator.EASE_OUT}
    )
  }

  timeline.play()
  stage = new PrimaryStage {
    scene = new Scene {
      content = List(rect1, rect2)
    }
  }
}

Answer 1

在最新版本中，Timeline 前面缺少 new。应该是：

val timeline = new Timeline { 
   ... 
}

scalafx.animation.Timeline 未按预期工作

scalafx.animation.Timeline not working as expected

scala

scalafx