javafx

[Chris Vine <chris@cvine.freeserve.co.uk>]

There seems to be a problem with the 'javafx-scene' macro in kawa-2.4.

First, the example at
https://www.gnu.org/software/kawa/Building-JavaFX-applications.html#idm139760384873792
fails to size the button correctly when compared with kawa-2.1.9.  The
same occurs with kawa-2.3 (I have not tested with kawa-2.2).

Curiously, taking this more complex example:

*****************
(require 'javafx-defs)
(javafx-application)

(javafx-scene
 title: "Hello Button"
 width: 600 height: 450
 (Button
  text: "Click Me"
  layout-x: 25
  layout-y: 40
  on-action: (lambda (e) (format #t "Event: ~s~%~!" e)))
 (Button
  text: "Click Me 2"
  layout-x: 25
  layout-y: 70
  on-action: (lambda (e) (format #t "Event: ~s~%~!" e)))
 (Button
  text: "Click Me 3"
  layout-x: 25
  layout-y: 100
  on-action: (lambda (e) (format #t "Event: ~s~%~!" e))))
*****************

kawa-2.3 works correctly (the buttons are correctly sized), whereas
kawa-2.4 fails to run the code, with this error:

Exception in Application start method
java.lang.RuntimeException: Exception in Application start method
	at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:917)
	at com.sun.javafx.application.LauncherImpl.lambda$launchApplication$156(LauncherImpl.java:182)
	at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.ClassCastException: java.util.ArrayList cannot be cast to javafx.scene.Node
	at gnu.kawa.javafx.MakeScene.build(MakeScene.scm:54)
	at javafx-test2.run(javafx-test2.kawa:10008)
	at gnu.kawa.javafx.KawaJavafxApplication.start(defs.scm:65)
	at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$163(LauncherImpl.java:863)
	at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$176(PlatformImpl.java:326)
	at com.sun.javafx.application.PlatformImpl.lambda$null$174(PlatformImpl.java:295)
	at java.security.AccessController.doPrivileged(Native Method)
	at com.sun.javafx.application.PlatformImpl.lambda$runLater$175(PlatformImpl.java:294)
	at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
	at com.sun.glass.ui.gtk.GtkApplication._runLoop(Native Method)
	at com.sun.glass.ui.gtk.GtkApplication.lambda$null$50(GtkApplication.java:139)
	... 1 more

If you avoid the javafx-scene macro, and set up the scene by hand,
all seems to work fine with any kawa-2 version.

Chris