tornadofx更換主題顏色樣式

import javafx.scene.paint.Color
import javafx.stage.Stage
import tornadofx.*
import kotlin.reflect.KClass


class LearnApp : App(ThemeView::class){
    val themeController: ThemeController by inject()

    override fun start(stage: Stage) {
        super.start(stage)
        // Make sure we initialize the theme selection system on start
        themeController.start()
    }
}



class ThemeController : Controller() {
    // List of available themes
//    val themes = listProperty<KClass<out Stylesheet>>(listOf(LightTheme::class, DarkTheme::class).asObservable())
    val themes = listProperty(listOf(LightTheme::class, DarkTheme::class).asObservable())

    // Property holding the active theme
    val activeThemeProperty = objectProperty<KClass<out Stylesheet>>()
    var activeTheme by activeThemeProperty

    fun start() {
        // Remove old theme, add new theme on change
        activeThemeProperty.addListener { _, oldTheme, newTheme ->
            oldTheme?.let { removeStylesheet(it) }
            newTheme?.let { importStylesheet(it) }
        }

        // Activate the first theme, triggering the listener above
        activeTheme = themes.first()
    }
}

class ThemeView : View("更換主題顏色樣式") {
    val settings: ThemeController by inject()

    override val root = form {
        fieldset("Theme") {
            field {
                vbox(10) {
                    togglegroup {
                        // One radio button for each theme, with their value set as the theme
                        settings.themes.forEach { theme ->
                            radiobutton(theme.simpleName,  value=theme)
                        }

                        // The toggle group value is bound to the activeThemeProperty
                        bind(settings.activeThemeProperty)
                    }
                }
            }
            buttonbar {
                button("Close").action(this@ThemeView::close)
            }
        }
        prefWidth=300.0
        prefHeight=300.0
    }
}

// Two themes for completeness
class DarkTheme : Stylesheet() {
    init {
        root {
            backgroundColor += Color.DARKGREEN
        }
    }
}

class LightTheme : Stylesheet() {
    init {
        root {
            backgroundColor += Color.LIGHTCYAN
        }
    }
}