JavaFX TableView TableRow焦點行爲奇怪

Question

如果有問題，我正在使用JDK 1.7.0_51。我有以下改編的示例代碼來演示我看到的不尋常行爲。

我已經以編程方式選擇了表格中的第0行，然後在0位置插入了添加的行。我希望選定的行向下移動一個，但相反它會下降兩個。另外，當我監視表格行上的焦點屬性時，我發現它在添加單行時發生了很大變化。當插入完成後，第2行有深藍色背景表示選擇，但第3行有一個藍色突出顯示的邊界。我不確定那是什麼。

我正在進行數據驗證時，錶行焦點丟失，以便我可以防止用戶離開當前條目，直到它正確形成。但是，這種選擇和關注行爲正在導致我的申請行爲失當。這是我能夠創建的最簡單的測試用例，它顯示了正在發生的事情。

import javafx.application.Application; 
import javafx.beans.property.SimpleStringProperty; 
import javafx.beans.value.ChangeListener; 
import javafx.beans.value.ObservableValue; 
import javafx.collections.FXCollections; 
import javafx.collections.ListChangeListener; 
import javafx.collections.ObservableList; 
import javafx.event.ActionEvent; 
import javafx.event.EventHandler; 
import javafx.geometry.Insets; 
import javafx.scene.Group; 
import javafx.scene.Scene; 
import javafx.scene.control.Button; 
import javafx.scene.control.Label; 
import javafx.scene.control.TableColumn; 
import javafx.scene.control.TablePosition; 
import javafx.scene.control.TableRow; 
import javafx.scene.control.TableView; 
import javafx.scene.control.TextField; 
import javafx.scene.control.cell.PropertyValueFactory; 
import javafx.scene.layout.HBox; 
import javafx.scene.layout.VBox; 
import javafx.scene.text.Font; 
import javafx.stage.Stage; 
import javafx.util.Callback; 

public class TableViewTest extends Application 
{ 

    private final TableView<Person> table = new TableView<Person>(); 
    private final ObservableList<Person> data = 
     FXCollections.observableArrayList(
      new Person("Jacob", "Smith", "jacob.smith@example.com"), 
      new Person("Isabella", "Johnson", "isabella.johnson@example.com"), 
      new Person("Ethan", "Williams", "ethan.williams@example.com"), 
      new Person("Emma", "Jones", "emma.jones@example.com"), 
      new Person("Michael", "Brown", "michael.brown@example.com")); 
    final HBox hb = new HBox(); 

    public static void main(String[] args) 
    { 
    launch(args); 
    } 

    @Override 
    public void start(Stage stage) 
    { 
    Scene scene = new Scene(new Group()); 
    stage.setTitle("Table View Sample"); 
    stage.setWidth(450); 
    stage.setHeight(550); 

    final Label label = new Label("Address Book"); 
    label.setFont(new Font("Arial", 20)); 

    table.setEditable(true); 
    table.setRowFactory(getRowFactory()); 

    TableColumn firstNameCol = new TableColumn("First Name"); 
    firstNameCol.setMinWidth(100); 
    firstNameCol.setCellValueFactory(
     new PropertyValueFactory< Person, String >("firstName")); 

    TableColumn lastNameCol = new TableColumn("Last Name"); 
    lastNameCol.setMinWidth(100); 
    lastNameCol.setCellValueFactory(
     new PropertyValueFactory< Person, String >("lastName")); 

    TableColumn emailCol = new TableColumn("Email"); 
    emailCol.setMinWidth(200); 
    emailCol.setCellValueFactory(
     new PropertyValueFactory< Person, String >("email")); 

    table.setItems(data); 
    table.getColumns().addAll(firstNameCol, lastNameCol, emailCol); 

    table.getSelectionModel().select(0); 

    table.getSelectionModel().getSelectedCells().addListener(new ListChangeListener<TablePosition>() 
    { 
     @Override 
     public void onChanged(final ListChangeListener.Change< ? extends TablePosition > c) 
     { 
     if (!c.getList().isEmpty()) 
     { 
      for (TablePosition pos : c.getList()) 
      { 
      System.out.println("Row " + String.valueOf(pos.getRow()) + " selected"); 
      } 
     } 
     else 
     { 
      System.out.println("Row unselected"); 
     } 
     } 
    }); 

    final TextField addFirstName = new TextField(); 
    addFirstName.setPromptText("First Name"); 
    addFirstName.setMaxWidth(firstNameCol.getPrefWidth()); 
    final TextField addLastName = new TextField(); 
    addLastName.setMaxWidth(lastNameCol.getPrefWidth()); 
    addLastName.setPromptText("Last Name"); 
    final TextField addEmail = new TextField(); 
    addEmail.setMaxWidth(emailCol.getPrefWidth()); 
    addEmail.setPromptText("Email"); 

    final Button addButton = new Button("Add"); 
    addButton.setOnAction(new EventHandler<ActionEvent>() 
    { 
     @Override 
     public void handle(ActionEvent e) 
     { 
     data.add(0, new Person(
      addFirstName.getText(), 
      addLastName.getText(), 
      addEmail.getText())); 
     addFirstName.clear(); 
     addLastName.clear(); 
     addEmail.clear(); 
     } 
    }); 

    hb.getChildren().addAll(addFirstName, addLastName, addEmail, addButton); 
    hb.setSpacing(3); 

    final VBox vbox = new VBox(); 
    vbox.setSpacing(5); 
    vbox.setPadding(new Insets(10, 0, 0, 10)); 
    vbox.getChildren().addAll(label, table, hb); 

    ((Group) scene.getRoot()).getChildren().addAll(vbox); 

    stage.setScene(scene); 
    stage.show(); 
    } 

    private Callback< TableView<Person>, TableRow<Person>> getRowFactory() 
    { 
    return new Callback< TableView<Person>, TableRow<Person>>() 
    { 
     @Override 
     public TableRow<Person> call(final TableView<Person> arg0) 
     { 

     return new DataTableRow(); 
     } 
    }; 
    } 

    public class DataTableRow extends TableRow<Person> 
    { 

    private final ChangeListener<Boolean> focusListener = new ChangeListener<Boolean>() 
    { 
     @Override 
     public void changed(final ObservableValue< ? extends Boolean > unused, final Boolean arg1, 
      final Boolean focused) 
     { 
     System.out.println("Row " + getIndex() + " Focus: " + focused); 
     } 
    }; 

    public DataTableRow() 
    { 
     focusedProperty().addListener(this.focusListener); 
    } 
    } 

    public static class Person 
    { 

    private final SimpleStringProperty firstName; 
    private final SimpleStringProperty lastName; 
    private final SimpleStringProperty email; 

    private Person(String fName, String lName, String email) 
    { 
     this.firstName = new SimpleStringProperty(fName); 
     this.lastName = new SimpleStringProperty(lName); 
     this.email = new SimpleStringProperty(email); 
    } 

    public String getFirstName() 
    { 
     return firstName.get(); 
    } 

    public void setFirstName(String fName) 
    { 
     firstName.set(fName); 
    } 

    public String getLastName() 
    { 
     return lastName.get(); 
    } 

    public void setLastName(String fName) 
    { 
     lastName.set(fName); 
    } 

    public String getEmail() 
    { 
     return email.get(); 
    } 

    public void setEmail(String fName) 
    { 
     email.set(fName); 
    } 
    } 
} 

我從運行這一點，並加入了單行得到的輸出是：

Row unselected 
Row 1 selected 
Row 0 Focus: false 
Row 1 Focus: true 
Row 1 Focus: false 
Row 2 Focus: true 
Row unselected 
Row unselected 
Row 2 selected 
Row 2 Focus: false 
Row 3 Focus: true 
Row 3 Focus: true 

誰能幫助我明白是怎麼回事，這是正確的行爲？

Answer 1

你在用什麼IDE？你在IntelliJ上試過了嗎？當我在IntelliJ中運行你的Class時，我沒有報告過的焦點問題。我正在使用jdk 8u20。當我進入一個新行時，前一行變得不重要，新行變得焦點。見下：

Row 0 Focus: true 
Row 0 Focus: false 
Row 1 Focus: true 
Row 1 selected 
Row 1 Focus: false 
Row 2 Focus: true 
Row 2 selected 
Row unselected 
Row 3 selected 
Row 2 Focus: false 
Row 3 Focus: true 
Row 3 Focus: false 
Row 4 Focus: true 
Row 1 Focus: true 
Row 4 Focus: false 
Row 1 selected 
Row 1 Focus: false 
Row 5 Focus: true 
Row 5 selected 
Row 3 Focus: true 
Row 5 Focus: false 
Row 3 selected 
Row 0 Focus: true 
Row 3 Focus: false 
Row 0 selected 
Row 0 Focus: false 
Row 1 Focus: true 
Row 1 selected 
Row 1 Focus: false 
Row 2 Focus: true 
Row 2 selected 
Row 2 Focus: false 
Row 3 Focus: true 
Row 3 selected 
Row 0 Focus: true 
Row 3 Focus: false 
Row 0 selected