实现可折叠应用导航

src/main/java/com/example/workutils/system/ui/MainWindow.java

@@ -1,159 +1,76 @@
 package com.example.workutils.system.ui;
 
 import com.example.workutils.system.config.WorkUtilsProperties;
-import javafx.animation.KeyFrame;
+import com.example.workutils.system.ui.icon.AppIcon;
-import javafx.animation.KeyValue;
+import com.example.workutils.system.ui.icon.IconFactory;
-import javafx.animation.Timeline;
+import com.example.workutils.system.ui.shell.NavigationRail;
-import javafx.application.Platform;
-import javafx.collections.FXCollections;
 import javafx.geometry.Insets;
-import javafx.geometry.Orientation;
 import javafx.geometry.Pos;
-import javafx.scene.Cursor;
 import javafx.scene.Parent;
 import javafx.scene.Scene;
-import javafx.scene.control.*;
+import javafx.scene.control.Label;
 import javafx.scene.image.Image;
-import javafx.scene.input.MouseEvent;
+import javafx.scene.layout.BorderPane;
-import javafx.scene.layout.*;
+import javafx.scene.layout.HBox;
-import javafx.scene.paint.Color;
+import javafx.scene.layout.Priority;
-import javafx.scene.shape.Circle;
+import javafx.scene.layout.Region;
-import javafx.scene.shape.Rectangle;
+import javafx.scene.layout.StackPane;
-import javafx.scene.text.Font;
+import javafx.scene.layout.VBox;
 import javafx.scene.text.TextAlignment;
 import javafx.stage.Stage;
-import javafx.util.Duration;
+import org.kordamp.ikonli.javafx.FontIcon;
 
 import java.io.InputStream;
-import java.util.*;
+import java.util.ArrayList;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
 
-/**
+/** Main application window and shell-level plugin content host. */
- * 工作工具集主窗口 —— AtlantaFX 重构版
- * <p>
- * 左侧导航栏（ListView）+ 右侧内容区，使用 CSS 类控制样式。
- */
 public class MainWindow {
-
     private final Stage stage;
-    private List<NavItem> navItems;
     private final WorkUtilsProperties properties;
+    private final Map<String, EmbeddedEntry> embeddedCache = new LinkedHashMap<>();
 
-    private VBox navBox;
+    private List<NavItem> navItems;
-    private ListView<NavItem> navList;
+    private NavigationRail navigationRail;
     private StackPane contentArea;
     private NavItem activeNavItem;
     private String activePluginId;
     private EmbeddedEntry currentEmbedded;
 
-    /** 顶部工具栏控件 */
     private HBox pluginToolbar;
-    private Label toolbarIcon, toolbarTitle;
+    private Label toolbarIcon;
-
+    private Label toolbarTitle;
-    /** 导航栏控件引用（响应式刷新用） */
-    private Label appLabel;
-    private Label welcomeIcon, welcomeHeading, welcomeDesc;
-
-    private final Map<String, EmbeddedEntry> embeddedCache = new LinkedHashMap<>();
-
-    /** 响应式缩放因子 */
-    private double responsiveScale = 1.0;
 
     public MainWindow(List<NavItem> navItems, WorkUtilsProperties properties) {
-        this.navItems = navItems;
+        this.navItems = new ArrayList<>(navItems);
         this.properties = properties;
         this.stage = new Stage();
         buildUI();
     }
 
-    // ==================== 响应式字体 ====================
-
-    private int rsz(int base) { return Math.max(9, (int) (base * responsiveScale)); }
-    private Font rfont(int base) { return Theme.base(rsz(base)); }
-    private Font rbold(int base) { return Theme.bold(rsz(base)); }
-    private Font rcaption(int base) { return Theme.caption(rsz(base)); }
-
-    public double getResponsiveScale() { return responsiveScale; }
-
-    private SplitPane splitPane;
-
-    private void updateScale(double width) {
-        if (Double.isNaN(width) || width <= 0) return;
-        double newScale = Math.max(0.85, Math.min(1.4, width / 1280.0));
-        // debounce: resize 时频繁触发，延迟 150ms 才真正刷新，避免 UI 卡顿
-        if (scaleDebounce != null) scaleDebounce.stop();
-        scaleDebounce = new javafx.animation.Timeline(
-            new javafx.animation.KeyFrame(javafx.util.Duration.millis(150),
-                e -> {
-                    if (Math.abs(newScale - responsiveScale) > 0.025) {
-                        responsiveScale = newScale;
-                        refreshResponsive();
-                    }
-                }));
-        scaleDebounce.play();
-    }
-
-    private javafx.animation.Timeline scaleDebounce;
-
-    private void refreshResponsive() {
-        appLabel.setFont(rbold(14));
-
-        double navMin = computeNavMinBaseWidth() * responsiveScale;
-        navBox.setMinWidth(navMin);
-        navBox.setMaxWidth(Math.max(navMin + 120, 360));
-        if (splitPane.getWidth() > 0 && splitPane.getDividers().size() > 0) {
-            double minPos = navMin / splitPane.getWidth();
-            if (splitPane.getDividers().get(0).getPosition() < minPos) {
-                splitPane.setDividerPosition(0, minPos);
-            }
-        }
-
-        if (welcomeIcon != null) welcomeIcon.setFont(rfont(64));
-        if (welcomeHeading != null) welcomeHeading.setFont(rbold(fsTitle() + 4));
-        if (welcomeDesc != null) welcomeDesc.setFont(rfont(fsBody()));
-
-        toolbarIcon.setFont(rfont(18));
-        toolbarTitle.setFont(rbold(14));
-
-        // ListView 自动处理 cell 渲染；cell 内部用 rfont 在 updateItem 中读取最新 scale
-        if (navList != null) navList.refresh();
-    }
-
-    private double computeNavMinBaseWidth() {
-        // 固定图标区 24px + 间距 8px + 最长文字约 6字符 * 13px ≈ 78px + padding 32px
-        return 24 + 8 + 130 + 16;
-    }
-
-    /**
-     * 刷新导航栏（插件启用/禁用后调用）
-     */
     public void refreshNavItems(List<NavItem> newItems) {
-        this.navItems.clear();
+        navItems = new ArrayList<>(newItems);
-        this.navItems.addAll(newItems);
+        navigationRail.setItems(navItems);
-        if (navList != null) {
-            navList.setItems(FXCollections.observableArrayList(navItems));
-            navList.getSelectionModel().clearSelection();
-        }
         showWelcomePage();
     }
 
-    private int fsTitle() { return properties.getFontSectionTitle(); }
+    public void show() {
-    private int fsBtn()   { return properties.getFontButton(); }
+        stage.show();
-    private int fsBody()  { return properties.getFontBody(); }
+    }
 
-    // ==================== 窗口入口 ====================
+    public void showAndWait() {
+        stage.showAndWait();
+    }
 
-    public void show() { stage.show(); }
-    public void showAndWait() { stage.showAndWait(); }
-
-    // ==================== UI 构建 ====================
-
-    /** 从 classpath 加载应用图标并设置到 Stage */
     private void setAppIcon() {
-        try (InputStream is = getClass().getClassLoader().getResourceAsStream("app_icon.png")) {
+        try (InputStream input = getClass().getClassLoader().getResourceAsStream("app_icon.png")) {
-            if (is != null) {
+            if (input != null) {
-                stage.getIcons().add(new Image(is));
+                stage.getIcons().add(new Image(input));
             }
         } catch (Exception ignored) {
+            // A missing window icon must not prevent the application from starting.
         }
     }
 
@@ -164,59 +81,35 @@ public class MainWindow {
         stage.setHeight(800);
         stage.setMinWidth(1100);
         stage.setMinHeight(680);
-        stage.setOnCloseRequest(e -> { embeddedCache.clear(); });
+        stage.setOnCloseRequest(event -> embeddedCache.clear());
-
-        stage.widthProperty().addListener((obs, old, w) -> updateScale(w.doubleValue()));
-        updateScale(stage.getWidth());
 
         BorderPane root = new BorderPane();
         root.setTop(buildUnifiedHeader());
 
-        splitPane = new SplitPane();
+        navigationRail = new NavigationRail(navItems, this::navigateTo);
-        splitPane.setOrientation(Orientation.HORIZONTAL);
-
-        VBox navBar = buildNavBar();
-        double navMinBase = computeNavMinBaseWidth();
-        double navMin = navMinBase * responsiveScale;
-        navBar.setMinWidth(navMin);
-        navBar.setMaxWidth(Math.max(navMin + 120, 360));
-        SplitPane.setResizableWithParent(navBar, false);
-
         contentArea = new StackPane();
         contentArea.getStyleClass().add(Theme.CSS_CONTENT_AREA);
-        SplitPane.setResizableWithParent(contentArea, true);
+        HBox.setHgrow(contentArea, Priority.ALWAYS);
 
-        // 初始分隔线位置
+        HBox shell = new HBox(navigationRail, contentArea);
-        splitPane.widthProperty().addListener(new javafx.beans.value.ChangeListener<Number>() {
+        root.setCenter(shell);
-            @Override
-            public void changed(javafx.beans.value.ObservableValue<? extends Number> obs, Number oldW, Number newW) {
-                if (newW.doubleValue() > 0) {
-                    splitPane.setDividerPosition(0, navMin / newW.doubleValue());
-                    splitPane.widthProperty().removeListener(this);
-                }
-            }
-        });
-
-        splitPane.getItems().addAll(navBar, contentArea);
-        root.setCenter(splitPane);
 
         Scene scene = new Scene(root);
         Theme.applyCustomCss(scene);
         stage.setScene(scene);
-
         showWelcomePage();
     }
 
-    // ==================== 统一顶部栏 ====================
-
     private HBox buildUnifiedHeader() {
         HBox bar = new HBox(Theme.S1);
         bar.setAlignment(Pos.CENTER_LEFT);
         bar.setPadding(new Insets(0, Theme.S5, 0, Theme.S4));
+        bar.setMinHeight(DesignTokens.HEADER_HEIGHT);
+        bar.setPrefHeight(DesignTokens.HEADER_HEIGHT);
+        bar.setMaxHeight(DesignTokens.HEADER_HEIGHT);
         bar.getStyleClass().add(Theme.CSS_HEADER_BAR);
 
-        Label brand = new Label("🛠");
+        FontIcon brand = IconFactory.create(AppIcon.APP, 20);
-        brand.setFont(rfont(20));
         bar.getChildren().add(brand);
 
         Region spacerLeft = new Region();
@@ -228,21 +121,26 @@ public class MainWindow {
         pluginToolbar.setManaged(false);
 
         toolbarIcon = new Label();
-        toolbarIcon.setFont(rfont(18));
+        toolbarIcon.setFont(Theme.body());
         toolbarTitle = new Label();
-        toolbarTitle.setFont(rbold(14));
+        toolbarTitle.setFont(Theme.body());
-        toolbarTitle.setTextFill(Theme.TEXT_PRIMARY);
-
         pluginToolbar.getChildren().addAll(toolbarIcon, toolbarTitle);
         bar.getChildren().add(pluginToolbar);
 
         Region spacerRight = new Region();
         HBox.setHgrow(spacerRight, Priority.ALWAYS);
         bar.getChildren().add(spacerRight);
-
         return bar;
     }
 
+    private void navigateTo(NavItem item) {
+        activeNavItem = item;
+        if (item.action != null) {
+            item.action.run();
+        }
+        showEmbeddedFor(item);
+    }
+
     private void showPluginToolbar(String icon, String title) {
         toolbarIcon.setText(icon);
         toolbarTitle.setText(title);
@@ -255,190 +153,29 @@ public class MainWindow {
         pluginToolbar.setManaged(false);
     }
 
-    // ==================== 左侧导航栏 ====================
-
-    private VBox buildNavBar() {
-        navBox = new VBox(0);
-        navBox.getStyleClass().add(Theme.CSS_NAV_BAR);
-
-        // 品牌区
-        appLabel = new Label("  🛠 WorkUtils");
-        appLabel.setFont(rbold(14));
-        appLabel.getStyleClass().add(Theme.CSS_NAV_BRAND);
-        appLabel.setMaxWidth(Double.MAX_VALUE);
-        navBox.getChildren().add(appLabel);
-
-        // 分割线
-        Separator sep = new Separator();
-        sep.getStyleClass().add(Theme.CSS_NAV_SEP);
-        sep.setPadding(new Insets(0));
-        navBox.getChildren().add(sep);
-
-        // ====== 标准化 ListView 导航 ======
-        navList = new ListView<>(FXCollections.observableArrayList(navItems));
-        navList.getStyleClass().add(Theme.CSS_NAV_LIST);
-        navList.setStyle("-fx-background-color: transparent;"); // inline 兜底
-        navList.setCellFactory(lv -> new NavListCell());
-        navList.getSelectionModel().selectedItemProperty().addListener(
-            (obs, old, newVal) -> {
-                if (newVal != null) {
-                    this.activeNavItem = newVal;
-                    if (newVal.action != null) newVal.action.run();
-                    showEmbeddedFor(newVal);
-                    // 阻止 ListView 默认把选中项滚到中部
-                    // 延迟到当前事件循环结束后，让我们的滚动覆盖默认行为
-                    Platform.runLater(() -> {
-                        int idx = navList.getSelectionModel().getSelectedIndex();
-                        if (idx > 0) navList.scrollTo(idx - 1);
-                    });
-                }
-            });
-
-        // ListView 撑满 VBox 剩余空间，内容溢出时自动滚动
-        VBox.setVgrow(navList, Priority.ALWAYS);
-        navBox.getChildren().add(navList);
-
-        return navBox;
-    }
-
-    /**
-     * 自定义导航 Cell —— 包含图标、文本、左侧指示条、点击涟漪。
-     * 配合 ListView 自带的选择/键盘/滚动行为。
-     */
-    private class NavListCell extends ListCell<NavItem> {
-
-        private final Rectangle indicator;
-        private final Label iconLabel;
-        private final Label nameLabel;
-        private final Circle ripple;
-        private final StackPane cellRoot;
-
-        NavListCell() {
-            super();
-
-            indicator = new Rectangle(4, 28);
-            indicator.getStyleClass().add(Theme.CSS_NAV_INDICATOR);
-            indicator.setMouseTransparent(true);
-
-            iconLabel = new Label();
-            iconLabel.setPrefWidth(24);
-            iconLabel.setAlignment(Pos.CENTER_LEFT);
-            iconLabel.setMouseTransparent(true);
-
-            nameLabel = new Label();
-            nameLabel.setMouseTransparent(true);
-
-            // 涟漪层（点击时扩散）
-            ripple = new Circle(0);
-            ripple.getStyleClass().add(Theme.CSS_NAV_RIPPLE);
-            ripple.setMouseTransparent(true);
-            // 关键：不参与 layout，防止动画过程撑大 StackPane 高度
-            ripple.setManaged(false);
-
-            HBox content = new HBox(10, indicator, iconLabel, nameLabel);
-            content.setAlignment(Pos.CENTER_LEFT);
-            content.setMouseTransparent(true);
-
-            cellRoot = new StackPane(ripple, content);
-            cellRoot.setAlignment(Pos.CENTER_LEFT);
-
-            setGraphic(cellRoot);
-            setText(null);
-            getStyleClass().add(Theme.CSS_NAV_CELL);
-
-            // 监听 selected 变化以更新 CSS class（必须在 ripple 初始化之后）
-            // 直接设置 textFill 绕过 AtlantaFX CSS 优先级问题
-            selectedProperty().addListener((obs, old, isSelected) -> {
-                updateStyleClass();
-                if (isSelected) {
-                    ripple.setOpacity(0);
-                }
-                // 强制 text-fill：深色背景统一用白色
-                nameLabel.setTextFill(Color.WHITE);
-                iconLabel.setTextFill(Color.WHITE);
-            });
-
-            // 点击涟漪动画
-            addEventHandler(MouseEvent.MOUSE_PRESSED, this::onCellPressed);
-        }
-
-        @Override
-        protected void updateItem(NavItem item, boolean empty) {
-            super.updateItem(item, empty);
-            if (empty || item == null) {
-                setGraphic(null);
-                updateStyleClass();
-                return;
-            }
-            iconLabel.setText(item.icon);
-            iconLabel.setFont(rfont(13));
-            nameLabel.setText(item.name);
-            nameLabel.setFont(rfont(13));
-            // 直接在代码中强制 text-fill，深色导航栏统一用白色
-            nameLabel.setTextFill(Color.WHITE);
-            iconLabel.setTextFill(Color.WHITE);
-            setGraphic(cellRoot);
-            updateStyleClass();
-        }
-
-        private void updateStyleClass() {
-            getStyleClass().removeAll(Theme.CSS_NAV_CELL, Theme.CSS_NAV_CELL_ACTIVE);
-            if (isEmpty()) return;
-            boolean active = isSelected();
-            getStyleClass().add(active ? Theme.CSS_NAV_CELL_ACTIVE : Theme.CSS_NAV_CELL);
-        }
-
-        /** 点击涟漪扩散动画 */
-        private void onCellPressed(MouseEvent e) {
-            if (isEmpty()) return;
-            double x = e.getX();
-            double y = e.getY();
-            ripple.setCenterX(x);
-            ripple.setCenterY(y);
-            ripple.setRadius(0);
-            ripple.setOpacity(0.6);
-
-            double maxRadius = Math.max(getWidth(), getHeight());
-            Timeline anim = new Timeline(
-                new KeyFrame(Duration.ZERO,
-                    new KeyValue(ripple.radiusProperty(), 0)),
-                new KeyFrame(Duration.millis(500),
-                    new KeyValue(ripple.radiusProperty(), maxRadius),
-                    new KeyValue(ripple.opacityProperty(), 0))
-            );
-            // 关键：动画结束必须重置 radius 为 0，否则 Circle 会撑大 StackPane 高度
-            anim.setOnFinished(ev -> {
-                ripple.setRadius(0);
-                ripple.setOpacity(0);
-            });
-            anim.play();
-        }
-    }
-
-    // ==================== 欢迎页 ====================
-
     private void showWelcomePage() {
         VBox welcome = new VBox(20);
         welcome.setAlignment(Pos.CENTER);
         welcome.setPadding(new Insets(60));
         welcome.getStyleClass().add(Theme.CSS_WELCOME_PAGE);
 
-        welcomeIcon = new Label("🛠");
+        FontIcon welcomeIcon = IconFactory.create(AppIcon.APP, 64);
-        welcomeIcon.setFont(rfont(64));
+        Label welcomeHeading = new Label("WorkUtils 开发工作集");
-
+        welcomeHeading.setFont(Theme.pageTitle());
-        welcomeHeading = new Label("WorkUtils 开发工作集");
-        welcomeHeading.setFont(rbold(fsTitle() + 4));
         welcomeHeading.getStyleClass().add(Theme.CSS_WELCOME_HEADING);
 
-        welcomeDesc = new Label("一站式开发工具平台 · 文本对比 · 代码生成 · Git 同步\nAPI 文档导出 · SQL 导出 · 关键词扫描 · 系统设置");
+        Label welcomeDescription = new Label(
-        welcomeDesc.setFont(rfont(fsBody()));
+                "一站式开发工具平台 · 文本对比 · 代码生成 · Git 同步\n"
-        welcomeDesc.getStyleClass().add(Theme.CSS_WELCOME_DESC);
+                        + "API 文档导出 · SQL 导出 · 关键词扫描 · 系统设置");
-        welcomeDesc.setTextAlignment(TextAlignment.CENTER);
+        welcomeDescription.setFont(Theme.body());
-        welcomeDesc.setMaxWidth(560);
+        welcomeDescription.getStyleClass().add(Theme.CSS_WELCOME_DESC);
+        welcomeDescription.setTextAlignment(TextAlignment.CENTER);
+        welcomeDescription.setMaxWidth(560);
 
-        welcome.getChildren().addAll(welcomeIcon, welcomeHeading, welcomeDesc);
+        welcome.getChildren().addAll(welcomeIcon, welcomeHeading, welcomeDescription);
         contentArea.getChildren().setAll(welcome);
         hidePluginToolbar();
+        activeNavItem = null;
         activePluginId = null;
         currentEmbedded = null;
     }
@@ -454,12 +191,8 @@ public class MainWindow {
         }
     }
 
-    // ==================== 内嵌管理 ====================
-
     public void embedPlugin(String pluginId, String icon, String name, Parent content) {
-        EmbeddedEntry existing = embeddedCache.get(pluginId);
+        embeddedCache.remove(pluginId);
-        if (existing != null) { embeddedCache.remove(pluginId); }
-
         EmbeddedEntry entry = new EmbeddedEntry(content, icon, name);
         embeddedCache.put(pluginId, entry);
         switchToEmbedded(pluginId, entry);
@@ -469,29 +202,32 @@ public class MainWindow {
         if (currentEmbedded != null && currentEmbedded != entry) {
             contentArea.getChildren().remove(currentEmbedded.wrapper);
         }
-        this.activePluginId = pluginId;
+        activePluginId = pluginId;
-        this.currentEmbedded = entry;
+        currentEmbedded = entry;
 
         if (entry.wrapper == null) {
             entry.wrapper = new BorderPane();
             entry.wrapper.getStyleClass().add(Theme.CSS_CONTENT_AREA);
             entry.wrapper.setCenter(entry.content);
         }
-
         if (!contentArea.getChildren().contains(entry.wrapper)) {
             contentArea.getChildren().setAll(entry.wrapper);
         }
-
         showPluginToolbar(entry.icon, entry.title);
     }
 
     public void closePlugin(String pluginId) {
         EmbeddedEntry entry = embeddedCache.remove(pluginId);
-        if (entry != null) {
+        if (entry == null) {
-            if (entry.wrapper != null) { contentArea.getChildren().remove(entry.wrapper); }
+            return;
-            if (currentEmbedded == entry) {
-                currentEmbedded = null; activePluginId = null; showWelcomePage();
         }
+        if (entry.wrapper != null) {
+            contentArea.getChildren().remove(entry.wrapper);
+        }
+        if (currentEmbedded == entry) {
+            currentEmbedded = null;
+            activePluginId = null;
+            showWelcomePage();
         }
     }
 
@@ -509,34 +245,67 @@ public class MainWindow {
         showPluginToolbar(icon, title);
     }
 
-    // ==================== 主题刷新（供设置窗口调用） ====================
-
     public void refreshTheme() {
         Theme.applyCustomCss(stage.getScene());
     }
 
-    // ==================== 内嵌条目 ====================
+    private static final class EmbeddedEntry {
+        private final Parent content;
+        private final String icon;
+        private final String title;
+        private BorderPane wrapper;
 
-    private static class EmbeddedEntry {
+        private EmbeddedEntry(Parent content, String icon, String title) {
-        final Parent content;
+            this.content = content;
-        final String icon, title;
+            this.icon = icon;
-        BorderPane wrapper;
+            this.title = title;
-
-        EmbeddedEntry(Parent c, String ic, String t) {
-            content=c; icon=ic; title=t;
         }
     }
 
-    // ==================== 导航项 ====================
-
     public static class NavItem {
-        public final String icon, name, description, pluginId;
+        public final AppIcon icon;
+        public final String name;
+        public final String description;
+        public final String pluginId;
         public final Runnable action;
-        public NavItem(String i, String n, String d, Runnable a) {
+
-            this(i, n, d, a, null);
+        public NavItem(AppIcon icon, String name, String description, Runnable action) {
+            this(icon, name, description, action, null);
         }
-        public NavItem(String i, String n, String d, Runnable a, String pid) {
+
-            icon=i; name=n; description=d; action=a; pluginId=pid;
+        public NavItem(AppIcon icon, String name, String description, Runnable action, String pluginId) {
+            this.icon = icon;
+            this.name = name;
+            this.description = description;
+            this.action = action;
+            this.pluginId = pluginId;
+        }
+
+        /** Compatibility bridge while plugin descriptors still expose their legacy icon text. */
+        public NavItem(String ignoredIcon, String name, String description, Runnable action) {
+            this(iconForPlugin(null), name, description, action, null);
+        }
+
+        /** Compatibility bridge while plugin descriptors still expose their legacy icon text. */
+        public NavItem(String ignoredIcon, String name, String description, Runnable action, String pluginId) {
+            this(iconForPlugin(pluginId), name, description, action, pluginId);
+        }
+
+        private static AppIcon iconForPlugin(String pluginId) {
+            if (pluginId == null) {
+                return AppIcon.APP;
+            }
+            return switch (pluginId) {
+                case "scan" -> AppIcon.SCANNER;
+                case "diff" -> AppIcon.DIFF;
+                case "api-doc" -> AppIcon.API_DOC;
+                case "git-sync" -> AppIcon.GIT_SYNC;
+                case "git-review" -> AppIcon.GIT_REVIEW;
+                case "mybatisexport" -> AppIcon.SQL_EXPORT;
+                case "mybatisgenerator" -> AppIcon.MYBATIS_GENERATOR;
+                case "__settings__" -> AppIcon.SETTINGS;
+                default -> AppIcon.APP;
+            };
         }
     }
 }

src/main/java/com/example/workutils/system/ui/shell/NavigationRail.java

@@ -0,0 +1,211 @@
+package com.example.workutils.system.ui.shell;
+
+import com.example.workutils.system.ui.DesignTokens;
+import com.example.workutils.system.ui.MainWindow;
+import com.example.workutils.system.ui.Theme;
+import com.example.workutils.system.ui.icon.AppIcon;
+import com.example.workutils.system.ui.icon.IconFactory;
+import javafx.application.Platform;
+import javafx.beans.property.ReadOnlyBooleanProperty;
+import javafx.beans.property.ReadOnlyBooleanWrapper;
+import javafx.css.PseudoClass;
+import javafx.geometry.Pos;
+import javafx.scene.control.Button;
+import javafx.scene.control.ContentDisplay;
+import javafx.scene.control.Label;
+import javafx.scene.control.Separator;
+import javafx.scene.control.ToggleButton;
+import javafx.scene.control.ToggleGroup;
+import javafx.scene.control.Tooltip;
+import javafx.scene.layout.HBox;
+import javafx.scene.layout.Priority;
+import javafx.scene.layout.Region;
+import javafx.scene.layout.VBox;
+
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Objects;
+import java.util.function.Consumer;
+
+/**
+ * Application-level navigation with a fixed expanded or collapsed width.
+ */
+public final class NavigationRail extends VBox {
+    private static final PseudoClass COLLAPSED = PseudoClass.getPseudoClass("collapsed");
+
+    private final ReadOnlyBooleanWrapper expanded = new ReadOnlyBooleanWrapper(this, "expanded", true);
+    private final Consumer<MainWindow.NavItem> navigator;
+    private final ToggleGroup selection = new ToggleGroup();
+    private final Map<String, MainWindow.NavItem> itemsByPluginId = new LinkedHashMap<>();
+    private final Map<String, ToggleButton> buttonsByPluginId = new LinkedHashMap<>();
+    private final Map<String, Tooltip> tooltipsByPluginId = new LinkedHashMap<>();
+    private final VBox itemBox = new VBox();
+    private final Label brandLabel = new Label("WorkUtils");
+    private final Button collapseButton = new Button();
+
+    private MainWindow.NavItem selectedItem;
+    private String selectedPluginId;
+
+    public NavigationRail(List<MainWindow.NavItem> items,
+                          Consumer<MainWindow.NavItem> navigator) {
+        requireFxThread();
+        this.navigator = Objects.requireNonNull(navigator, "navigator must not be null");
+
+        getStyleClass().addAll(Theme.CSS_NAV_BAR, "navigation-rail");
+        buildHeader();
+        itemBox.getStyleClass().add("navigation-rail-items");
+        VBox.setVgrow(itemBox, Priority.ALWAYS);
+        getChildren().addAll(new Separator(), itemBox);
+
+        expanded.addListener((observable, oldValue, newValue) -> updateAppearance());
+        setItems(items);
+        updateAppearance();
+    }
+
+    public ReadOnlyBooleanProperty expandedProperty() {
+        return expanded.getReadOnlyProperty();
+    }
+
+    public boolean isExpanded() {
+        return expanded.get();
+    }
+
+    public void setExpanded(boolean value) {
+        requireFxThread();
+        expanded.set(value);
+    }
+
+    public void toggle() {
+        requireFxThread();
+        setExpanded(!isExpanded());
+    }
+
+    public void selectPlugin(String pluginId) {
+        requireFxThread();
+        ToggleButton button = buttonsByPluginId.get(pluginId);
+        MainWindow.NavItem item = itemsByPluginId.get(pluginId);
+        if (button == null || item == null) {
+            return;
+        }
+        activate(item, button);
+    }
+
+    public String selectedPluginId() {
+        return selectedPluginId;
+    }
+
+    public void setItems(List<MainWindow.NavItem> items) {
+        requireFxThread();
+        Objects.requireNonNull(items, "items must not be null");
+
+        selection.selectToggle(null);
+        itemBox.getChildren().clear();
+        itemsByPluginId.clear();
+        buttonsByPluginId.clear();
+        tooltipsByPluginId.clear();
+        selectedItem = null;
+        selectedPluginId = null;
+
+        for (MainWindow.NavItem item : items) {
+            addItem(Objects.requireNonNull(item, "navigation item must not be null"));
+        }
+        updateItemAppearance();
+    }
+
+    Tooltip tooltipFor(String pluginId) {
+        return tooltipsByPluginId.get(pluginId);
+    }
+
+    private void buildHeader() {
+        HBox header = new HBox(Theme.S2);
+        header.setAlignment(Pos.CENTER_LEFT);
+        header.setMinHeight(DesignTokens.HEADER_HEIGHT);
+        header.setPrefHeight(DesignTokens.HEADER_HEIGHT);
+        header.setMaxHeight(DesignTokens.HEADER_HEIGHT);
+
+        brandLabel.setGraphic(IconFactory.create(AppIcon.APP, 18));
+        brandLabel.setContentDisplay(ContentDisplay.LEFT);
+        brandLabel.setFont(Theme.sectionTitle());
+
+        Region spacer = new Region();
+        HBox.setHgrow(spacer, Priority.ALWAYS);
+
+        collapseButton.getStyleClass().add("navigation-rail-toggle");
+        collapseButton.setOnAction(event -> toggle());
+        header.getChildren().addAll(brandLabel, spacer, collapseButton);
+        getChildren().add(header);
+    }
+
+    private void addItem(MainWindow.NavItem item) {
+        ToggleButton button = new ToggleButton(item.name, IconFactory.createButtonIcon(item.icon, item.name));
+        button.setToggleGroup(selection);
+        button.setContentDisplay(ContentDisplay.LEFT);
+        button.setAlignment(Pos.CENTER_LEFT);
+        button.setMinHeight(DesignTokens.ROW_HEIGHT);
+        button.setPrefHeight(DesignTokens.ROW_HEIGHT);
+        button.setMaxHeight(DesignTokens.ROW_HEIGHT);
+        button.setMaxWidth(Double.MAX_VALUE);
+        button.getStyleClass().add(Theme.CSS_NAV_CELL);
+        if (item.pluginId != null) {
+            button.setId("nav-" + item.pluginId);
+        }
+
+        Tooltip tooltip = new Tooltip(item.name);
+        button.setOnAction(event -> activate(item, button));
+
+        itemsByPluginId.put(item.pluginId, item);
+        buttonsByPluginId.put(item.pluginId, button);
+        tooltipsByPluginId.put(item.pluginId, tooltip);
+        itemBox.getChildren().add(button);
+    }
+
+    private void activate(MainWindow.NavItem item, ToggleButton button) {
+        selection.selectToggle(button);
+        buttonsByPluginId.values().forEach(candidate ->
+                candidate.getStyleClass().remove(Theme.CSS_NAV_CELL_ACTIVE));
+        if (!button.getStyleClass().contains(Theme.CSS_NAV_CELL_ACTIVE)) {
+            button.getStyleClass().add(Theme.CSS_NAV_CELL_ACTIVE);
+        }
+        if (selectedItem == item) {
+            return;
+        }
+        selectedItem = item;
+        selectedPluginId = item.pluginId;
+        navigator.accept(item);
+    }
+
+    private void updateAppearance() {
+        int width = isExpanded()
+                ? DesignTokens.NAV_EXPANDED_WIDTH
+                : DesignTokens.NAV_COLLAPSED_WIDTH;
+        setMinWidth(width);
+        setPrefWidth(width);
+        setMaxWidth(width);
+        pseudoClassStateChanged(COLLAPSED, !isExpanded());
+
+        brandLabel.setVisible(isExpanded());
+        brandLabel.setManaged(isExpanded());
+        collapseButton.setGraphic(IconFactory.createButtonIcon(
+                isExpanded() ? AppIcon.CHEVRON_LEFT : AppIcon.CHEVRON_RIGHT,
+                isExpanded() ? "折叠导航" : "展开导航"));
+        collapseButton.setTooltip(new Tooltip(isExpanded() ? "折叠导航" : "展开导航"));
+        updateItemAppearance();
+    }
+
+    private void updateItemAppearance() {
+        for (Map.Entry<String, ToggleButton> entry : buttonsByPluginId.entrySet()) {
+            MainWindow.NavItem item = itemsByPluginId.get(entry.getKey());
+            ToggleButton button = entry.getValue();
+            button.setText(isExpanded() ? item.name : null);
+            button.setTooltip(isExpanded() ? null : tooltipsByPluginId.get(entry.getKey()));
+            button.setAlignment(isExpanded() ? Pos.CENTER_LEFT : Pos.CENTER);
+        }
+    }
+
+    private static void requireFxThread() {
+        if (!Platform.isFxApplicationThread()) {
+            throw new IllegalStateException("NavigationRail must be accessed on the JavaFX Application Thread");
+        }
+    }
+}

src/test/java/com/example/workutils/system/ui/FxTestSupport.java

@@ -0,0 +1,43 @@
+package com.example.workutils.system.ui;
+
+import javafx.application.Platform;
+
+import java.util.concurrent.Callable;
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.FutureTask;
+
+public final class FxTestSupport {
+    static {
+        try {
+            CountDownLatch started = new CountDownLatch(1);
+            Platform.startup(started::countDown);
+            started.await();
+        } catch (IllegalStateException alreadyStarted) {
+            // JavaFX toolkit is already running in this test JVM.
+        } catch (InterruptedException interrupted) {
+            Thread.currentThread().interrupt();
+            throw new AssertionError(interrupted);
+        }
+    }
+
+    public static <T> T fx(Callable<T> action) throws Exception {
+        FutureTask<T> task = new FutureTask<>(action);
+        Platform.runLater(task);
+        return task.get();
+    }
+
+    public static void fx(ThrowingRunnable action) throws Exception {
+        fx(() -> {
+            action.run();
+            return null;
+        });
+    }
+
+    @FunctionalInterface
+    public interface ThrowingRunnable {
+        void run() throws Exception;
+    }
+
+    private FxTestSupport() {
+    }
+}

src/test/java/com/example/workutils/system/ui/shell/NavigationRailTest.java

@@ -0,0 +1,103 @@
+package com.example.workutils.system.ui.shell;
+
+import com.example.workutils.system.ui.DesignTokens;
+import com.example.workutils.system.ui.MainWindow;
+import com.example.workutils.system.ui.Theme;
+import com.example.workutils.system.ui.icon.AppIcon;
+import javafx.css.PseudoClass;
+import javafx.scene.control.ToggleButton;
+import javafx.scene.control.Tooltip;
+import org.junit.jupiter.api.Test;
+
+import java.util.List;
+import java.util.concurrent.atomic.AtomicInteger;
+import java.util.concurrent.atomic.AtomicReference;
+
+import static com.example.workutils.system.ui.FxTestSupport.fx;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertSame;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+class NavigationRailTest {
+
+    private static final MainWindow.NavItem API_DOC = new MainWindow.NavItem(
+            AppIcon.API_DOC,
+            "API 接口文档导出",
+            "导出接口文档",
+            () -> {
+            },
+            "api-doc");
+
+    @Test
+    void collapsePreservesSelectionAndDoesNotRouteAgain() throws Exception {
+        fx(() -> {
+            AtomicInteger routed = new AtomicInteger();
+            AtomicReference<MainWindow.NavItem> selected = new AtomicReference<>();
+            NavigationRail rail = new NavigationRail(List.of(API_DOC), item -> {
+                selected.set(item);
+                routed.incrementAndGet();
+            });
+
+            rail.selectPlugin("api-doc");
+            rail.setExpanded(false);
+
+            ToggleButton apiDocButton = (ToggleButton) rail.lookup("#nav-api-doc");
+            assertEquals("api-doc", rail.selectedPluginId());
+            assertEquals(API_DOC, selected.get());
+            assertEquals(1, routed.get());
+            assertTrue(apiDocButton.isSelected());
+            assertTrue(apiDocButton.getStyleClass().contains(Theme.CSS_NAV_CELL_ACTIVE));
+        });
+    }
+
+    @Test
+    void reselectingCurrentPluginKeepsItSelectedWithoutRoutingAgain() throws Exception {
+        fx(() -> {
+            AtomicInteger routed = new AtomicInteger();
+            NavigationRail rail = new NavigationRail(List.of(API_DOC), item -> routed.incrementAndGet());
+            ToggleButton apiDocButton = (ToggleButton) rail.lookup("#nav-api-doc");
+
+            apiDocButton.fire();
+            apiDocButton.fire();
+
+            assertTrue(apiDocButton.isSelected());
+            assertEquals("api-doc", rail.selectedPluginId());
+            assertEquals(1, routed.get());
+        });
+    }
+
+    @Test
+    void collapsedRailUsesExactFixedWidthAndCollapsedPseudoClass() throws Exception {
+        fx(() -> {
+            NavigationRail rail = new NavigationRail(List.of(API_DOC), item -> {
+            });
+
+            assertEquals(DesignTokens.NAV_EXPANDED_WIDTH, rail.getMinWidth());
+            assertEquals(DesignTokens.NAV_EXPANDED_WIDTH, rail.getPrefWidth());
+            assertEquals(DesignTokens.NAV_EXPANDED_WIDTH, rail.getMaxWidth());
+            rail.setExpanded(false);
+
+            assertEquals(DesignTokens.NAV_COLLAPSED_WIDTH, rail.getMinWidth());
+            assertEquals(DesignTokens.NAV_COLLAPSED_WIDTH, rail.getPrefWidth());
+            assertEquals(DesignTokens.NAV_COLLAPSED_WIDTH, rail.getMaxWidth());
+            assertTrue(rail.getPseudoClassStates().contains(PseudoClass.getPseudoClass("collapsed")));
+        });
+    }
+
+    @Test
+    void collapsedItemKeepsARealTooltipWithItsVisibleLabel() throws Exception {
+        fx(() -> {
+            NavigationRail rail = new NavigationRail(List.of(API_DOC), item -> {
+            });
+
+            rail.setExpanded(false);
+
+            Tooltip tooltip = rail.tooltipFor("api-doc");
+            ToggleButton apiDocButton = (ToggleButton) rail.lookup("#nav-api-doc");
+            assertNotNull(tooltip);
+            assertEquals("API 接口文档导出", tooltip.getText());
+            assertSame(tooltip, apiDocButton.getTooltip());
+        });
+    }
+}