fun main(args: Array<String>) {
    launch<ModalTransparencyTest>(args)
}

class ModalTransparencyTest: App(TestView::class, ModalTransparencyStyles::class)

class TestView : View() {
    override val root = vbox {

        alignment = Pos.CENTER
        prefHeight = 600.0
        prefWidth = 800.0

        button("open modal window").action {
            find<TestFragment>().openWindow(StageStyle.TRANSPARENT, escapeClosesWindow = true)
        }
    }
}

class ModalTransparencyStyles : Stylesheet() {

    companion object {
        val container by cssclass()
        val glassBackground by cssclass()
        val mainWindow by cssclass()
        val popupWindow by cssclass()
    }

    init {
        mainWindow {
            backgroundColor += BLUE
        }
        popupWindow {
            backgroundColor += TRANSPARENT
        }
        glassBackground {
            backgroundColor += BLACK
            opacity = 0.5
        }
        container {
            backgroundColor += TRANSPARENT
        }
    }
}

class TestFragment: Fragment() {
    override val root = stackpane {

        addClass( ModalTransparencyStyles.popupWindow )

        vbox {
            addClass( ModalTransparencyStyles.glassBackground )
            vgrow = Priority.ALWAYS
        }

        vbox {
            addClass( ModalTransparencyStyles.container )
            alignment = Pos.CENTER
            vgrow = Priority.ALWAYS
            label("Label text here")
            button("Run")
        }

        prefWidth =  320.0
        prefHeight = 480.0
    }

    override fun onDock() {
        currentStage!!.scene.fill = Color.TRANSPARENT
    }
}