在应用程序执行期间更改样式表 TornadoFX

Question

我正在尝试在我的应用程序中添加功能，以允许用户在名为“设置”的视图中更改应用程序的背景主题 (Light/Dark)。如果我通过使用样式表类中的两个不同样式表来更改主题，那么如何更改应用程序在执行期间使用的样式表？有更简单的方法吗？

我的这些设置代码可以在下面找到。对代码的任何改进也很有帮助：

class Settings(){
    var BackGroundTheme: BackGroundThemeState = BackGroundThemeState.Light
}
enum class BackGroundThemeState{Light, Dark}

class SettingsController: Controller(){
    private var settings = Settings()

    fun changeTheme(state: BackGroundThemeState){
        when(state){
            Light -> settings.BackGroundTheme = Light
            Dark  -> settings.BackGroundTheme = Dark
        }
        when(settings.BackGroundTheme){
//            Light -> do nothing for now
            Dark  -> importStylesheet(app.DarkThemeStyleSheet)
        }
        reloadStylesheetsOnFocus()
    }
} 

class SettingsView: View("Settings"){
    val settings: SettingsController by inject()
    private val toggleGroup = ToggleGroup()

    override val root = vbox(){
        alignment = Pos.BOTTOM_CENTER
        setPrefSize(300.0, 200.0)
        hbox(){
            alignment = Pos.BASELINE_LEFT
            vbox {
                paddingTop = 10.0
                paddingLeft = 30.0
                paddingBottom = 90.0
                label("Theme")
                radiobutton("Light", toggleGroup){
                    isSelected = true
                    action {
                      settings.changeTheme(Light)
                    }
                }
                radiobutton("Dark", toggleGroup) {
                    action {
                        settings.changeTheme(Dark)
                    }
                }
            }
        }
        hbox {
            alignment = Pos.BOTTOM_RIGHT
            paddingRight = 15.0
            paddingBottom = 10.0
            button("OK"){
                setPrefSize(70.0, 30.0)
                action{
                    find(SettingsView::class).close()
                }
            }
        }
    }
}

Answer 1

如果您依赖可观察的属性，这可以更顺利地完成。创建一个包含当前主题的属性并在属性更改时删除旧主题并添加新主题。

您可以依靠切换组的内置功能绑定到活动主题属性。

这是一个完整的应用程序：

class MyThemeApp : App(SettingsView::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 = SimpleListProperty<KClass<out Stylesheet>>(listOf(LightTheme::class, DarkTheme::class).observable())

    // Property holding the active theme
    val activeThemeProperty = SimpleObjectProperty<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 SettingsView : View("Settings") {
    val settings: ThemeController by inject()

    override val root = form {
        fieldset("Theme") {
            field {
                vbox {

                    togglegroup {
                        // One radio button for each theme, with their value set as the theme
                        settings.themes.forEach { theme ->
                            radiobutton(theme.simpleName, getToggleGroup(), theme)
                        }

                        // The toggle group value is bound to the activeThemeProperty
                        bind(settings.activeThemeProperty)
                    }
                }
            }
            buttonbar {
                button("OK").action(this@SettingsView::close)
            }
        }
    }
}

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

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

在应用程序执行期间更改样式表 TornadoFX

Change Style Sheets During App Execution TornadoFX

kotlin

tornadofx