feat: add directory selectors for AI test toolchain

src/main/java/com/example/workutils/biz/aitest/ui/DirectoryPathSelector.java

@@ -0,0 +1,67 @@
+package com.example.workutils.biz.aitest.ui;
+
+import javafx.geometry.Pos;
+import javafx.scene.control.Button;
+import javafx.scene.control.TextField;
+import javafx.scene.layout.HBox;
+import javafx.scene.layout.Priority;
+import javafx.stage.DirectoryChooser;
+import javafx.stage.Window;
+
+import java.io.File;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.function.Supplier;
+
+public class DirectoryPathSelector extends HBox {
+    private final String label;
+    private final Supplier<Window> ownerSupplier;
+    private final TextField pathField = new TextField();
+    private final Button chooseButton = new Button("选择目录");
+
+    public DirectoryPathSelector(String label, Supplier<Window> ownerSupplier) {
+        super(8);
+        this.label = label;
+        this.ownerSupplier = ownerSupplier;
+        pathField.setEditable(false);
+        pathField.setPromptText("请选择" + label);
+        pathField.setAccessibleText(label);
+        chooseButton.setAccessibleText("选择 " + label + " 目录");
+        chooseButton.setOnAction(event -> chooseDirectory());
+        setAlignment(Pos.CENTER_LEFT);
+        HBox.setHgrow(pathField, Priority.ALWAYS);
+        getChildren().addAll(pathField, chooseButton);
+    }
+
+    public Path getPath() {
+        return pathField.getText().isBlank() ? Path.of("") : Path.of(pathField.getText());
+    }
+
+    public void setPath(Path path) {
+        pathField.setText(path == null || path.toString().isBlank() ? "" : path.toString());
+    }
+
+    public TextField pathField() {
+        return pathField;
+    }
+
+    public Button chooseButton() {
+        return chooseButton;
+    }
+
+    void applySelection(File selected) {
+        if (selected != null) {
+            setPath(selected.toPath());
+        }
+    }
+
+    private void chooseDirectory() {
+        DirectoryChooser chooser = new DirectoryChooser();
+        chooser.setTitle("选择 " + label + " 目录");
+        Path current = getPath();
+        if (!current.toString().isBlank() && Files.isDirectory(current)) {
+            chooser.setInitialDirectory(current.toFile());
+        }
+        applySelection(chooser.showDialog(ownerSupplier.get()));
+    }
+}

src/test/java/com/example/workutils/biz/aitest/ui/DirectoryPathSelectorTest.java

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+package com.example.workutils.biz.aitest.ui;
+
+import com.example.workutils.system.ui.FxTestSupport;
+import org.junit.jupiter.api.Test;
+
+import java.io.File;
+import java.nio.file.Path;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+
+class DirectoryPathSelectorTest {
+
+    @Test
+    void pathIsReadOnlyAndCancelKeepsExistingValue() throws Exception {
+        DirectoryPathSelector selector = FxTestSupport.fx(
+                () -> new DirectoryPathSelector("JDK 8 Home", () -> null));
+        FxTestSupport.fx(() -> selector.setPath(Path.of("C:/jdk8")));
+        FxTestSupport.fx(() -> selector.applySelection(null));
+
+        assertFalse(FxTestSupport.fx(() -> selector.pathField().isEditable()));
+        assertEquals(Path.of("C:/jdk8"), FxTestSupport.fx(selector::getPath));
+    }
+
+    @Test
+    void selectedDirectoryUpdatesValue() throws Exception {
+        DirectoryPathSelector selector = FxTestSupport.fx(
+                () -> new DirectoryPathSelector("Maven Home", () -> null));
+
+        FxTestSupport.fx(() -> selector.applySelection(new File("C:/maven")));
+
+        assertEquals(Path.of("C:/maven"), FxTestSupport.fx(selector::getPath));
+        assertEquals("选择 Maven Home 目录", FxTestSupport.fx(
+                () -> selector.chooseButton().getAccessibleText()));
+    }
+}