src/main/kotlin/com/marvinelsen/willow/Config.kt

@@ -0,0 +1,29 @@
+package com.marvinelsen.willow
+
+import javafx.beans.property.IntegerProperty
+import javafx.beans.property.SimpleIntegerProperty
+import java.util.prefs.Preferences
+
+class Config {
+    companion object {
+        private const val DETAIL_HEADWORD_FONT_SIZE_KEY = "detailHeadwordFontSize"
+
+        private const val DEFAULT_DETAIL_HEADWORD_FONT_SIZE = 16
+    }
+
+    private val preferences = Preferences.userNodeForPackage(this::class.java)
+
+    val detailHeadwordFontSize: IntegerProperty = SimpleIntegerProperty(DEFAULT_DETAIL_HEADWORD_FONT_SIZE)
+
+    fun save() {
+        preferences.putInt(DETAIL_HEADWORD_FONT_SIZE_KEY, detailHeadwordFontSize.value)
+    }
+
+    fun load() {
+        detailHeadwordFontSize.value = preferences.getInt(DETAIL_HEADWORD_FONT_SIZE_KEY, DEFAULT_DETAIL_HEADWORD_FONT_SIZE)
+    }
+
+    fun reset() {
+        detailHeadwordFontSize.value = DEFAULT_DETAIL_HEADWORD_FONT_SIZE
+    }
+}

src/main/kotlin/com/marvinelsen/willow/WillowApplication.kt

@@ -45,14 +45,16 @@ class WillowApplication : Application() {
         val searchService = SearchService(dictionary)
         val findWordsService = FindWordsService(dictionary)
         val model = Model(searchService, findWordsService)
+        val config = Config()
+        config.load()
 
         val fxmlLoader = FXMLLoader()
         fxmlLoader.resources = resourceBundle
         fxmlLoader.controllerFactory = Callback { type ->
             when (type) {
                 MainController::class.java -> MainController(model)
-                MenuController::class.java -> MenuController(model)
+                MenuController::class.java -> MenuController(model, config)
-                DetailsController::class.java -> DetailsController(model)
+                DetailsController::class.java -> DetailsController(model, config)
                 SearchController::class.java -> SearchController(model)
                 ListController::class.java -> ListController(model)
                 else -> error("Trying to instantiate unknown controller type $type")

src/main/kotlin/com/marvinelsen/willow/ui/Configuration.kt

@@ -1,3 +1,15 @@
 package com.marvinelsen.willow.ui
 
-class Configuration
+data class Configuration(
+    val preferredScript: Script = Script.SIMPLIFIED,
+)
+
+enum class Script {
+    SIMPLIFIED, TRADITIONAL
+}
+
+enum class Pronunciation {
+    PINYIN_WITH_TONE_MARKS,
+    PINYIN_WITH_TONE_NUMBERS,
+    ZHUYIN
+}

src/main/kotlin/com/marvinelsen/willow/ui/controllers/DetailsController.kt

@@ -1,5 +1,6 @@
 package com.marvinelsen.willow.ui.controllers
 
+import com.marvinelsen.willow.Config
 import com.marvinelsen.willow.Model
 import com.marvinelsen.willow.ui.DictionaryEntryFx
 import javafx.beans.binding.Bindings
@@ -43,6 +44,15 @@ class DetailsController(private val model: Model) {
             Bindings.createStringBinding({ model.selectedEntry.value?.traditionalProperty?.value }, model.selectedEntry)
 
         labelHeadword.textProperty().bind(headwordObjectBinding)
+        labelHeadword
+            .styleProperty()
+            .bind(
+                Bindings.concat(
+                    "-fx-font-size: ",
+                    config.detailHeadwordFontSize.asString(),
+                    "px;"
+                )
+            )
 
         tabPaneDetails.disableProperty().bind(Bindings.isNull(model.selectedEntry))
 

src/main/kotlin/com/marvinelsen/willow/ui/controllers/MenuController.kt

@@ -1,13 +1,19 @@
 package com.marvinelsen.willow.ui.controllers
 
+import com.marvinelsen.willow.Config
 import com.marvinelsen.willow.Model
+import com.marvinelsen.willow.ui.dialogs.SettingsDialog
 import javafx.application.Platform
 import javafx.beans.binding.Bindings
 import javafx.fxml.FXML
+import javafx.scene.control.MenuBar
 import javafx.scene.control.MenuItem
 
 @Suppress("UnusedPrivateMember")
-class MenuController(private val model: Model) {
+class MenuController(private val model: Model, private val config: Config) {
+    @FXML
+    private lateinit var menuBar: MenuBar
+
     @FXML
     private lateinit var menuItemCopyHeadword: MenuItem
 
@@ -20,6 +26,16 @@ class MenuController(private val model: Model) {
         menuItemCopyHeadword.disableProperty().bind(Bindings.isNull(model.selectedEntry))
     }
 
+    @FXML
+    private fun onMenuItemPreferencesAction() {
+        SettingsDialog(menuBar.scene.window, config).showAndWait().ifPresent { result ->
+            when (result) {
+                SettingsDialog.Result.CHANGES -> config.save()
+                SettingsDialog.Result.NO_CHANGES -> config.load()
+            }
+        }
+    }
+
     @FXML
     private fun onMenuItemQuitAction() {
         Platform.exit()

src/main/kotlin/com/marvinelsen/willow/ui/converters/PronunciationStringConverter.kt

@@ -0,0 +1,14 @@
+package com.marvinelsen.willow.ui.converters
+
+import com.marvinelsen.willow.ui.Pronunciation
+import javafx.util.StringConverter
+
+class PronunciationStringConverter : StringConverter<Pronunciation>() {
+    override fun toString(pronunciation: Pronunciation) = when (pronunciation) {
+        Pronunciation.PINYIN_WITH_TONE_MARKS -> "Pinyin with tone marks"
+        Pronunciation.PINYIN_WITH_TONE_NUMBERS -> "Pinyin with tone numbers"
+        Pronunciation.ZHUYIN -> "Zhuyin"
+    }
+
+    override fun fromString(string: String) = null
+}

src/main/kotlin/com/marvinelsen/willow/ui/dialogs/SettingsDialog.kt

@@ -0,0 +1,74 @@
+package com.marvinelsen.willow.ui.dialogs
+
+import com.marvinelsen.willow.Config
+import com.marvinelsen.willow.WillowApplication
+import com.marvinelsen.willow.ui.Pronunciation
+import com.marvinelsen.willow.ui.formatters.FontSizeTextFormatter
+import javafx.fxml.FXMLLoader
+import javafx.scene.control.ButtonType
+import javafx.scene.control.CheckBox
+import javafx.scene.control.ComboBox
+import javafx.scene.control.Dialog
+import javafx.scene.control.DialogPane
+import javafx.scene.control.Spinner
+import javafx.stage.Modality
+import javafx.stage.Stage
+import javafx.stage.Window
+import javafx.util.Callback
+
+@Suppress("MemberVisibilityCanBePrivate")
+class SettingsDialog(owner: Window?, config: Config) : Dialog<SettingsDialog.Result>() {
+    companion object {
+        private const val DIALOG_MIN_HEIGHT = 400.0
+        private const val DIALOG_MIN_WIDTH = 400.0
+    }
+
+    enum class Result {
+        CHANGES, NO_CHANGES
+    }
+
+    lateinit var comboBoxEntryPronunciation: ComboBox<Pronunciation>
+    lateinit var comboBoxListPronunciation: ComboBox<Pronunciation>
+
+    lateinit var checkBoxListShowPronunciation: CheckBox
+    lateinit var checkBoxListShowDefinition: CheckBox
+
+    lateinit var spinnerEntryHeadwordFontSize: Spinner<Int>
+    lateinit var spinnerEntryPronunciationFontSize: Spinner<Int>
+    lateinit var spinnerListHeadwordFontSize: Spinner<Int>
+    lateinit var spinnerListPronunciationFontSize: Spinner<Int>
+    lateinit var spinnerListDefinitionFontSize: Spinner<Int>
+
+    private val entryHeadwordFontSizeObjectProperty = config.detailHeadwordFontSize.asObject()
+
+    init {
+        val loader = FXMLLoader(WillowApplication::class.java.getResource("/fxml/settings-dialog.fxml"))
+        loader.setController(this)
+        val root: DialogPane = loader.load()
+
+        dialogPane = root
+        title = "Settings"
+        isResizable = true
+
+        initOwner(owner)
+        initModality(Modality.APPLICATION_MODAL)
+
+        (dialogPane.scene.window as Stage).apply {
+            minWidth = DIALOG_MIN_WIDTH
+            minHeight = DIALOG_MIN_HEIGHT
+        }
+
+        with(spinnerEntryHeadwordFontSize) {
+            editor.textFormatter = FontSizeTextFormatter()
+            valueFactory.valueProperty().bindBidirectional(entryHeadwordFontSizeObjectProperty)
+        }
+
+        resultConverter = Callback(::convertToResult)
+    }
+
+    private fun convertToResult(buttonType: ButtonType) =
+        when (buttonType) {
+            ButtonType.APPLY -> Result.CHANGES
+            else -> Result.NO_CHANGES
+        }
+}

src/main/kotlin/com/marvinelsen/willow/ui/formatters/FontSizeTextFormatter.kt

@@ -0,0 +1,13 @@
+package com.marvinelsen.willow.ui.formatters
+
+import javafx.scene.control.TextFormatter
+import javafx.util.converter.IntegerStringConverter
+import java.util.function.UnaryOperator
+
+private val digitRegex = """\d*""".toRegex()
+
+class FontSizeTextFormatter : TextFormatter<Int>(
+    IntegerStringConverter(),
+    1,
+    UnaryOperator { if (digitRegex.matches(it.text)) it else null }
+)

src/main/resources/fxml/menu.fxml

@@ -4,10 +4,11 @@
 <?import javafx.scene.input.KeyCodeCombination?>
 <?import javafx.scene.layout.BorderPane?>
 <MenuBar xmlns="http://javafx.com/javafx/23" xmlns:fx="http://javafx.com/fxml/1"
+         fx:id="menuBar"
          fx:controller="com.marvinelsen.willow.ui.controllers.MenuController" BorderPane.alignment="CENTER"
          useSystemMenuBar="true">
     <Menu text="%menubar.file">
-        <MenuItem text="%menubar.file.preferences">
+        <MenuItem text="%menubar.file.preferences" onAction="#onMenuItemPreferencesAction">
             <accelerator>
                 <KeyCodeCombination alt="UP" code="COMMA" control="UP" meta="UP" shift="UP"
                                     shortcut="DOWN"/>

src/main/resources/fxml/settings-dialog.fxml

@@ -0,0 +1,123 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<?import com.marvinelsen.willow.ui.converters.PronunciationStringConverter?>
+<?import com.marvinelsen.willow.ui.*?>
+<?import javafx.collections.FXCollections?>
+<?import javafx.geometry.Insets?>
+<?import javafx.scene.control.*?>
+<?import javafx.scene.layout.*?>
+<DialogPane styleClass="settings-dialog" xmlns="http://javafx.com/javafx/23" xmlns:fx="http://javafx.com/fxml/1">
+    <fx:define>
+        <FXCollections fx:factory="observableArrayList" fx:id="phoneticAlphabets">
+            <Pronunciation fx:value="PINYIN_WITH_TONE_MARKS"/>
+            <Pronunciation fx:value="PINYIN_WITH_TONE_NUMBERS"/>
+            <Pronunciation fx:value="ZHUYIN"/>
+        </FXCollections>
+    </fx:define>
+    <content>
+        <TabPane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity"
+                 tabClosingPolicy="UNAVAILABLE">
+            <Tab closable="false" text="Entry">
+                <GridPane alignment="TOP_CENTER" hgap="8.0" vgap="8.0">
+                    <columnConstraints>
+                        <ColumnConstraints halignment="RIGHT" hgrow="ALWAYS"/>
+                        <ColumnConstraints halignment="LEFT" hgrow="ALWAYS"/>
+                    </columnConstraints>
+                    <rowConstraints>
+                        <RowConstraints valignment="BASELINE" vgrow="NEVER"/>
+                        <RowConstraints valignment="BASELINE" vgrow="NEVER"/>
+                        <RowConstraints valignment="BASELINE" vgrow="NEVER"/>
+                        <RowConstraints valignment="BASELINE" vgrow="NEVER"/>
+                    </rowConstraints>
+                    <padding>
+                        <Insets bottom="12.0" left="12.0" right="12.0" top="12.0"/>
+                    </padding>
+                    <Label text="Pronunciation:"/>
+                    <ComboBox fx:id="comboBoxEntryPronunciation" GridPane.columnIndex="1">
+                        <value>
+                            <Pronunciation fx:value="PINYIN_WITH_TONE_MARKS"/>
+                        </value>
+                        <converter>
+                            <PronunciationStringConverter/>
+                        </converter>
+                    </ComboBox>
+                    <Label text="Headword font size:" GridPane.rowIndex="2"/>
+                    <Label text="Pronunciation font size:" GridPane.rowIndex="3"/>
+                    <Spinner fx:id="spinnerEntryPronunciationFontSize" editable="true" GridPane.columnIndex="1"
+                             GridPane.rowIndex="3">
+                        <valueFactory>
+                            <SpinnerValueFactory.IntegerSpinnerValueFactory amountToStepBy="1" max="300" min="1"/>
+                        </valueFactory>
+                    </Spinner>
+                    <Spinner fx:id="spinnerEntryHeadwordFontSize" editable="true" GridPane.columnIndex="1"
+                             GridPane.rowIndex="2">
+                        <valueFactory>
+                            <SpinnerValueFactory.IntegerSpinnerValueFactory amountToStepBy="1" max="300" min="1"/>
+                        </valueFactory>
+                    </Spinner>
+                    <Separator prefWidth="200.0" GridPane.columnSpan="2147483647" GridPane.rowIndex="1"/>
+                </GridPane>
+            </Tab>
+            <Tab closable="false" text="List">
+                <GridPane alignment="TOP_CENTER" hgap="8.0" vgap="8.0">
+                    <columnConstraints>
+                        <ColumnConstraints halignment="RIGHT" hgrow="ALWAYS"/>
+                        <ColumnConstraints halignment="LEFT" hgrow="ALWAYS"/>
+                    </columnConstraints>
+                    <rowConstraints>
+                        <RowConstraints valignment="BASELINE" vgrow="NEVER"/>
+                        <RowConstraints valignment="BASELINE" vgrow="NEVER"/>
+                        <RowConstraints valignment="BASELINE" vgrow="NEVER"/>
+                        <RowConstraints valignment="BASELINE" vgrow="NEVER"/>
+                        <RowConstraints valignment="BASELINE" vgrow="NEVER"/>
+                        <RowConstraints valignment="BASELINE" vgrow="NEVER"/>
+                        <RowConstraints valignment="BASELINE" vgrow="NEVER"/>
+                        <RowConstraints valignment="BASELINE" vgrow="NEVER"/>
+                    </rowConstraints>
+                    <padding>
+                        <Insets bottom="12.0" left="12.0" right="12.0" top="12.0"/>
+                    </padding>
+                    <Label text="Pronunciation:"/>
+                    <ComboBox fx:id="comboBoxListPronunciation" GridPane.columnIndex="1">
+                        <value>
+                            <Pronunciation fx:value="PINYIN_WITH_TONE_MARKS"/>
+                        </value>
+                        <converter>
+                            <PronunciationStringConverter/>
+                        </converter>
+                    </ComboBox>
+                    <Label text="Headword font size:" GridPane.rowIndex="5"/>
+                    <Label text="Pronunciation font size:" GridPane.rowIndex="6"/>
+                    <Spinner fx:id="spinnerListPronunciationFontSize" editable="true" GridPane.columnIndex="1"
+                             GridPane.rowIndex="6">
+                        <valueFactory>
+                            <SpinnerValueFactory.IntegerSpinnerValueFactory amountToStepBy="1" max="300" min="1"/>
+                        </valueFactory>
+                    </Spinner>
+                    <Spinner fx:id="spinnerListHeadwordFontSize" editable="true" GridPane.columnIndex="1"
+                             GridPane.rowIndex="5">
+                        <valueFactory>
+                            <SpinnerValueFactory.IntegerSpinnerValueFactory amountToStepBy="1" max="300" min="1"/>
+                        </valueFactory>
+                    </Spinner>
+                    <Spinner fx:id="spinnerListDefinitionFontSize" editable="true" GridPane.columnIndex="1"
+                             GridPane.rowIndex="7">
+                        <valueFactory>
+                            <SpinnerValueFactory.IntegerSpinnerValueFactory amountToStepBy="1" max="300" min="1"/>
+                        </valueFactory>
+                    </Spinner>
+                    <Separator prefWidth="200.0" GridPane.columnSpan="2147483647" GridPane.rowIndex="4"/>
+                    <Label text="Definition font size:" GridPane.rowIndex="7"/>
+                    <Label text="Display:" GridPane.rowIndex="2"/>
+                    <CheckBox fx:id="checkBoxListShowPronunciation" mnemonicParsing="false" selected="true"
+                              text="Show pronunciation" GridPane.columnIndex="1" GridPane.rowIndex="2"/>
+                    <CheckBox fx:id="checkBoxListShowDefinition" mnemonicParsing="false" selected="true"
+                              text="Show definition" GridPane.columnIndex="1" GridPane.rowIndex="3"/>
+                    <Separator prefWidth="200.0" GridPane.columnSpan="2147483647" GridPane.rowIndex="1"/>
+                </GridPane>
+            </Tab>
+        </TabPane>
+    </content>
+    <ButtonType fx:id="buttonTypeApply" fx:constant="APPLY"/>
+    <ButtonType fx:constant="CANCEL"/>
+</DialogPane>