Implement video playback demo

gradle/project.gradle.kts

@@ -135,6 +135,8 @@ allprojects {
             exclude("net.java.dev.jna", "jna-jpms")
             exclude("net.java.dev.jna", "jna-platform-jpms")
          }
+         implementation("uk.co.caprica", "vlcj-javafx", "1.2.0")
+
          // implementation("net.jthink", "jaudiotagger", "3.0.1") // unmaintained
          implementation("com.github.RouHim", "jaudiotagger", "1.2.27") // >1.2.27 has build errors and jitpack has no jar, see https://jitpack.io/com/github/RouHim/jaudiotagger/
       }

src/demo/main/sp/it/demo/VlcjJfxVideoPlaybackDemo.kt

@@ -0,0 +1,59 @@
+package sp.it.demo
+
+import javafx.application.Application
+import javafx.scene.Scene
+import javafx.scene.control.Label
+import javafx.scene.image.ImageView
+import javafx.scene.input.TransferMode.COPY
+import javafx.scene.layout.StackPane
+import javafx.stage.Stage
+import kotlin.text.replaceFirst
+import sp.it.util.ui.size
+import sp.it.util.ui.x
+import uk.co.caprica.vlcj.factory.MediaPlayerFactory
+import uk.co.caprica.vlcj.javafx.videosurface.ImageViewVideoSurface
+
+/** Demo showing how to play video in JavaFX ImageView efficiently using vlcj */
+class VlcjJfxVideoPlaybackDemo : Application() {
+   val factory = MediaPlayerFactory("--demux=avformat");
+   val mediaPlayer = factory.mediaPlayers().newEmbeddedMediaPlayer();
+
+   override fun start(primaryStage: Stage) {
+      val imageView = ImageView().apply {
+         fitWidthProperty().bind(primaryStage.widthProperty()) // Bind width to stage width
+         fitHeightProperty().bind(primaryStage.heightProperty()) //
+         isPreserveRatio = true
+      }
+
+      mediaPlayer.videoSurface().set(ImageViewVideoSurface(imageView));
+      mediaPlayer.controls().setRepeat(true)
+
+      primaryStage.title = "Vlcj Video Player"
+      primaryStage.size = 500 x 500
+      primaryStage.scene = Scene(StackPane(imageView, Label("Drag & drop file to play")))
+      primaryStage.show()
+
+      // Handle drag-and-drop events
+      primaryStage.scene.setOnDragOver {
+         if (it.dragboard.hasFiles()) it.acceptTransferModes(COPY)
+         it.consume()
+      }
+      primaryStage.scene.setOnDragDropped {
+         if (it.dragboard.hasFiles()) {
+            val file = it.dragboard.files[0]
+            mediaPlayer.media().play(file.absoluteFile.toURI().toString().replaceFirst("file:/", "file:///"))
+         }
+         it.consume()
+      }
+   }
+
+   override fun stop() {
+      mediaPlayer.controls().stop()
+      mediaPlayer.release()
+   }
+
+}
+
+fun main() {
+   Application.launch(VlcjJfxVideoPlaybackDemo::class.java)
+}