用按钮添加新行到javafx tableview

Question

我已经在fxml中定义了一个tableview。它类似于以下内容：

SNO Name DOB Action 

Action列将在每行中包含带有文本“delete”的按钮。我有两个问题：

1. 如何将此删除按钮添加到javafx中最后一个单元格的每个新行？
2. 我如何获得该行的其删除按钮被点击？（这样我就可以删除行或做其他事件处理的工作）的指数

Answer 1

我觉得这个例子中用于项目刚刚经历它并在你的项目中实现.` package checkboxdemo;

import javafx.application.Application; 
import javafx.beans.value.ChangeListener; 
import javafx.beans.value.ObservableValue; 
import javafx.scene.Scene; 
import javafx.scene.control.CheckBox; 
import javafx.scene.control.TableColumn; 
import javafx.scene.control.TableView; 
import javafx.scene.layout.StackPane; 
import javafx.scene.layout.VBox; 
import javafx.stage.Stage; 

/** 
* 
* @author reegan 
*/ 
public class Checkboxdemo extends Application { 

    static int i = 0; 

    @Override 
    public void start(Stage primaryStage) { 
     CheckBox checkBox = new CheckBox(); 
     checkBox.selectedProperty().addListener(new ChangeListener<Boolean>() { 
      public void changed(ObservableValue ov, 
        Boolean old_val, Boolean new_val) { 
       if (ov.getValue() == true) { 
        i = i + 1; 
        System.out.println(i); 

       } 

      } 
     }); 

     TableView tableView = new TableView(); 
     TableColumn column = new TableColumn("check"); 
     TableColumn column1 = new TableColumn("Name"); 

     tableView.getColumns().addAll(column,column1); 

     VBox root = new VBox(); 
     root.getChildren().addAll(checkBox,tableView); 

     Scene scene = new Scene(root, 300, 250); 

     primaryStage.setTitle("Hello World!"); 
     primaryStage.setScene(scene); 




     primaryStage.show(); 
    } 

    /** 
    * The main() method is ignored in correctly deployed JavaFX application. 
    * main() serves only as fallback in case the application can not be 
    * launched through deployment artifacts, e.g., in IDEs with limited FX 
    * support. NetBeans ignores main(). 
    * 
    * @param args the command line arguments 
    */ 
    // public static void main(String[] args) { 
    // launch(args); 
    // } 
} 

package checkboxdemo; 
import javafx.beans.property.SimpleStringProperty; 
import javafx.beans.property.StringProperty; 
public class Person { 
    private StringProperty firstName; 
    private StringProperty lastName; 

    public Person(String firstName, String lastName) { 
    setFirstName(firstName); 
    setLastName(lastName); 
    } 

    public final void setFirstName(String value) { firstNameProperty().set(value); } 
    public final void setLastName(String value) { lastNameProperty().set(value); } 
    public String getFirstName() { return firstNameProperty().get(); } 
    public String getLastName() { return lastNameProperty().get(); } 

    public StringProperty firstNameProperty() { 
    if (firstName == null) firstName = new SimpleStringProperty(this, "firstName"); 
    return firstName; 
    } 
    public StringProperty lastNameProperty() { 
    if (lastName == null) lastName = new SimpleStringProperty(this, "lastName"); 
    return lastName; 
    } 
} 

和TableView中细胞

package checkboxdemo; 
import javafx.application.Application; 
import javafx.beans.property.*; 
import javafx.beans.value.ObservableValue; 
import javafx.collections.FXCollections; 
import javafx.event.*; 
import javafx.geometry.*; 
import javafx.scene.Scene; 
import javafx.scene.control.*; 
import javafx.scene.control.cell.PropertyValueFactory; 
import javafx.scene.image.Image; 
import javafx.scene.input.MouseEvent; 
import javafx.scene.layout.*; 
import javafx.stage.*; 
import javafx.util.Callback; 

public class TableViewWithAddButtonExample extends Application { 
    public static void main(String[] args) { launch(args); } 
    @Override public void start(final Stage stage) { 
    stage.setTitle("People"); 
// stage.getIcons().add(new Image("http://icons.iconarchive.com/icons/icons-land/vista-people/72/Historical-Viking-Female-icon.png")); // icon license: Linkware (Backlink to http://www.icons-land.com required) 

    // create a table. 
    final TableView<Person> table = new TableView<>(
     FXCollections.observableArrayList(
     new Person("Jacob", "Smith"), 
     new Person("Isabella", "Johnson"), 
     new Person("Ethan", "Williams"), 
     new Person("Emma", "Jones"), 
     new Person("Michael", "Brown") 
    ) 
    ); 

    // define the table columns. 
    TableColumn<Person, String> firstNameCol = new TableColumn<>("First Name"); 
    firstNameCol.setCellValueFactory(new PropertyValueFactory("firstName")); 
    TableColumn<Person, String> lastNameCol = new TableColumn<>("Last Name"); 
    lastNameCol.setCellValueFactory(new PropertyValueFactory("lastName")); 
    TableColumn<Person, Boolean> actionCol = new TableColumn<>("Action"); 
    actionCol.setSortable(false); 

    // define a simple boolean cell value for the action column so that the column will only be shown for non-empty rows. 
    actionCol.setCellValueFactory(new Callback<TableColumn.CellDataFeatures<Person, Boolean>, ObservableValue<Boolean>>() { 
     @Override public ObservableValue<Boolean> call(TableColumn.CellDataFeatures<Person, Boolean> features) { 
     return new SimpleBooleanProperty(features.getValue() != null); 
     } 
    }); 

    // create a cell value factory with an add button for each row in the table. 
    actionCol.setCellFactory(new Callback<TableColumn<Person, Boolean>, TableCell<Person, Boolean>>() { 
     @Override public TableCell<Person, Boolean> call(TableColumn<Person, Boolean> personBooleanTableColumn) { 
     return new AddPersonCell(stage, table); 
     } 
    }); 

    table.getColumns().setAll(firstNameCol, lastNameCol, actionCol); 
    table.setColumnResizePolicy(TableView.CONSTRAINED_RESIZE_POLICY); 

    stage.setScene(new Scene(table)); 
    stage.show(); 
    } 

    /** A table cell containing a button for adding a new person. */ 
    private class AddPersonCell extends TableCell<Person, Boolean> { 
    // a button for adding a new person. 
    final Button addButton  = new Button("Add"); 
    // pads and centers the add button in the cell. 
    final StackPane paddedButton = new StackPane(); 
    // records the y pos of the last button press so that the add person dialog can be shown next to the cell. 
    final DoubleProperty buttonY = new SimpleDoubleProperty(); 

    /** 
    * AddPersonCell constructor 
    * @param stage the stage in which the table is placed. 
    * @param table the table to which a new person can be added. 
    */ 
    AddPersonCell(final Stage stage, final TableView table) { 
     paddedButton.setPadding(new Insets(3)); 
     paddedButton.getChildren().add(addButton); 
     addButton.setOnMousePressed(new EventHandler<MouseEvent>() { 
     @Override public void handle(MouseEvent mouseEvent) { 
      buttonY.set(mouseEvent.getScreenY()); 
     } 
     }); 
     addButton.setOnAction(new EventHandler<ActionEvent>() { 
     @Override public void handle(ActionEvent actionEvent) { 
      showAddPersonDialog(stage, table, buttonY.get()); 
      table.getSelectionModel().select(getTableRow().getIndex()); 
     } 
     }); 
    } 

    /** places an add button in the row only if the row is not empty. */ 
    @Override protected void updateItem(Boolean item, boolean empty) { 
     super.updateItem(item, empty); 
     if (!empty) { 
     setContentDisplay(ContentDisplay.GRAPHIC_ONLY); 
     setGraphic(paddedButton); 
     } 
    } 
    } 

    /** 
    * shows a dialog which displays a UI for adding a person to a table. 
    * @param parent a parent stage to which this dialog will be modal and placed next to. 
    * @param table the table to which a person is to be added. 
    * @param y the y position of the top left corner of the dialog. 
    */ 
    private void showAddPersonDialog(Stage parent, final TableView<Person> table, double y) { 
    // initialize the dialog. 
    final Stage dialog = new Stage(); 
    dialog.setTitle("New Person"); 
    dialog.initOwner(parent); 
    dialog.initModality(Modality.WINDOW_MODAL); 
    dialog.initStyle(StageStyle.UTILITY); 
    dialog.setX(parent.getX() + parent.getWidth()); 
    dialog.setY(y); 

    // create a grid for the data entry. 
    GridPane grid = new GridPane(); 
    final TextField firstNameField = new TextField(); 
    final TextField lastNameField = new TextField(); 
    grid.addRow(0, new Label("First Name"), firstNameField); 
    grid.addRow(1, new Label("Last Name"), lastNameField); 
    grid.setHgap(10); 
    grid.setVgap(10); 
    GridPane.setHgrow(firstNameField, Priority.ALWAYS); 
    GridPane.setHgrow(lastNameField, Priority.ALWAYS); 

    // create action buttons for the dialog. 
    Button ok = new Button("OK"); 
    ok.setDefaultButton(true); 
    Button cancel = new Button("Cancel"); 
    cancel.setCancelButton(true); 

    // only enable the ok button when there has been some text entered. 
    ok.disableProperty().bind(firstNameField.textProperty().isEqualTo("").or(lastNameField.textProperty().isEqualTo(""))); 

    // add action handlers for the dialog buttons. 
    ok.setOnAction(new EventHandler<ActionEvent>() { 
     @Override public void handle(ActionEvent actionEvent) { 
     int nextIndex = table.getSelectionModel().getSelectedIndex() + 1; 
     table.getItems().add(nextIndex, new Person(firstNameField.getText(), lastNameField.getText())); 
     table.getSelectionModel().select(nextIndex); 
     dialog.close(); 
     } 
    }); 
    cancel.setOnAction(new EventHandler<ActionEvent>() { 
     @Override public void handle(ActionEvent actionEvent) { 
     dialog.close(); 
     } 
    }); 

    // layout the dialog. 
    HBox buttons = HBoxBuilder.create().spacing(10).children(ok, cancel).alignment(Pos.CENTER_RIGHT).build(); 
    VBox layout = new VBox(10); 
    layout.getChildren().addAll(grid, buttons); 
    layout.setPadding(new Insets(5)); 
    dialog.setScene(new Scene(layout)); 
    dialog.show(); 
    } 

}