Sunday, September 20, 2015

Center a text in the window

Pay attention to the textOrigin method.

package proscalafx.ch04.reversi.examples

import scalafx.Includes._
import scalafx.application.JFXApp
import scalafx.application.JFXApp.PrimaryStage
import scalafx.geometry.VPos
import scalafx.scene.Scene
import scalafx.scene.text.{Font, FontWeight, Text}

object CenterUsingBind extends JFXApp {
  val text = new Text("SCALA") {
    // origin of the local coordinate system for the text
    // x-axis is fixed at the left edige of the text
    // y-asix is customizable
    //    textOrigin = VPos.Top
    textOrigin = VPos.Center
    font = Font.font(null, FontWeight.Bold, 18)
  }

  stage = new PrimaryStage {
    scene = new Scene(400, 100) {
      content = text
    }
  }

  // if textOrigin = VPos.Top, then
  //  text.layoutX <== (stage.scene.width - text.prefWidth(-1)) / 2
  //  text.layoutY <== (stage.scene.height - text.prefHeight(-1)) / 2
  // if textOrigin = VPos.Center, then
  text.layoutX <== (stage.scene.width - text.prefWidth(-1)) / 2
  text.layoutY <== stage.scene.height / 2
}

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