JavaFX:如何编辑现有的 TableView 条目

Question

我已经弄清楚如何创建 TableView 以及如何向其中添加内容，但我对如何编辑现有内容感到困惑。

在这个应用程序中，我已经对其进行了设置，以便人们可以将玩家姓名和某些统计数据添加到桌面 View 中，但我现在希望能够添加随机滚动并向其添加 dex 和其他修饰符，并用它填充桌面 View 。这将驻留在 rollInitBtnClicked() 模块中。

请帮助我了解我需要做什么。

这是我的Main 类。

import javafx.application.Application;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.geometry.Insets;
import javafx.scene.control.Button;
import javafx.scene.Scene;
import javafx.scene.control.TableColumn;
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.stage.Stage;


public class Main extends Application {

TextField playerName;
TextField dexMod;
TextField otherMod;
TableView<Players> playersTable;
Button addPlayerBtn;
Button rollInitBtn;
Button delPlayerBtn;


public static void main(String[] args){

    launch(args);


}


@Override
public void start(Stage primaryStage) throws Exception {

    primaryStage.setTitle("Initiative");

    // TextField so the user can enter a players Name
    playerName = new TextField();
    playerName.setPrefSize(200, 20);
    playerName.setPromptText("Player Name");
    //playerName.setFocusTraversable(false);

    // TextField so the user can enter the players dex mod
    dexMod = new TextField();
    dexMod.setPrefSize(50, 20);
    dexMod.setPromptText("Dex");
    //dexMod.setFocusTraversable(false);

    // TextField so the user can enter the players other mods
    otherMod = new TextField();
    otherMod.setPrefSize(50, 20);
    otherMod.setPromptText("Other");
    //otherMod.setFocusTraversable(false);


    addPlayerBtn = new Button("Add Player"); 
    addPlayerBtn.setOnAction(e -> addPlayerBtnClicked());

    delPlayerBtn = new Button("Delete Player"); 
    delPlayerBtn.setOnAction(e -> delPlayerBtnClicked());

    rollInitBtn = new Button("Roll Initiative"); 
    rollInitBtn.setOnAction(e -> rollInitBtnClicked());



    //TableView Name Columns
    TableColumn<Players, String> nameColumn = new TableColumn<>("Name");
    nameColumn.setMinWidth(200);
    nameColumn.setCellValueFactory(new PropertyValueFactory<>("name"));

    //TableView dexMod Columns
    TableColumn<Players, String> dexColumn = new TableColumn<>("Dex Mod");
    dexColumn.setMinWidth(50);
    dexColumn.setStyle( "-fx-alignment: CENTER;");
    dexColumn.setCellValueFactory(new PropertyValueFactory<>("dexMod"));

    //TableView otherMod Columns
    TableColumn<Players, String> otherColumn = new TableColumn<>("Other Mods");
    otherColumn.setMinWidth(50);
    otherColumn.setStyle( "-fx-alignment: CENTER;");
    otherColumn.setCellValueFactory(new PropertyValueFactory<>("otherMod"));

    //TableView roll Columns
    TableColumn<Players, String> rollColumn = new TableColumn<>("Die Roll");
    rollColumn.setMinWidth(50);
    rollColumn.setStyle( "-fx-alignment: CENTER;");
    rollColumn.setCellValueFactory(new PropertyValueFactory<>("roll"));

    //TableView total Columns
    TableColumn<Players, String> totalColumn = new TableColumn<>("Total");
    totalColumn.setMinWidth(50);
    totalColumn.setStyle( "-fx-alignment: CENTER;");
    totalColumn.setCellValueFactory(new PropertyValueFactory<>("total"));



    playersTable = new TableView<>();
    playersTable.setColumnResizePolicy(TableView.CONSTRAINED_RESIZE_POLICY);
    playersTable.setItems(getPlayers());
    playersTable.getColumns().addAll(nameColumn, dexColumn, otherColumn, rollColumn, totalColumn);



    HBox hLayout = new HBox();
    hLayout.setPadding(new Insets(10, 10, 10, 10));         // sets the padding on the top right left and bottom of the layout
    hLayout.setSpacing(10);                                 // sets the spacing between the TextFields and buttons
    hLayout.getChildren().addAll(playerName, dexMod, otherMod, addPlayerBtn, rollInitBtn, delPlayerBtn);


    VBox vLayout = new VBox();
    vLayout.getChildren().addAll(playersTable, hLayout);


    Scene mainScene = new Scene(vLayout, 800, 400);
    primaryStage.setScene(mainScene);
    primaryStage.show();

}


// What happens when the user clicks the Add Player button
public void addPlayerBtnClicked() {

    Players players = new Players();
    players.setName(playerName.getText());
    players.setDexMod(Integer.parseInt(dexMod.getText()));
    players.setOtherMod(Integer.parseInt(otherMod.getText()));
    playersTable.getItems().add(players);
    playerName.clear();
    dexMod.clear();
    otherMod.clear();
}

// What happens when the user clicks the Delete Player button
public void delPlayerBtnClicked() {

    ObservableList<Players> playerSelected, allPlayers;
    allPlayers = playersTable.getItems();
    playerSelected = playersTable.getSelectionModel().getSelectedItems();

    playerSelected.forEach(allPlayers::remove);



}

public void rollInitBtnClicked() {

    Players players = new Players();
    ObservableList<Players> playerSelected, allPlayers;
    allPlayers = playersTable.getItems();
    playerSelected = playersTable.getSelectionModel().getSelectedItems();

    players.setRoll((int)Math.ceil(Math.random() * 20));

}



public ObservableList<Players> getPlayers(){
    ObservableList<Players> players = FXCollections.observableArrayList();
    return players;
}

}

以下内容位于名为 Players 的类中。

public class Players {

private String name;
private int dexMod;
private int otherMod;
private int roll;
private int total;


// default method to enter default data
public Players(){

}

// overloaded method to enter data that is handed to it
public Players(String name, int dexMod, int otherMod, int roll, int total){

    this.name = name;
    this.dexMod = dexMod;
    this.otherMod = otherMod;
    this.roll = roll;
    this.total = total;

}

public String getName() {
    return name;
}

public void setName(String name) {
    this.name = name;
}

public int getDexMod() {
    return dexMod;
}

public void setDexMod(int dexMod) {
    this.dexMod = dexMod;
}

public int getOtherMod() {
    return otherMod;
}

public void setOtherMod(int otherMod) {
    this.otherMod = otherMod;
}

public int getRoll() {
    return roll;
}

public void setRoll(int roll) {
    this.roll = roll;
}

public int getTotal() {
    return total;
}

public void setTotal(int total) {
    this.total = total;
}

}

Answer 1

对于TableView要获得修改通知，您需要创建 ObservableValue包装收到修改通知的可用属性值。 PropertyValueFactory使用方法<propertyName>Property()检索此ObservableValue 。如果不存在这样的方法，则使用 getter；然而在这种情况下TableView没有通知任何修改。此外total属性本身不应被修改。

从 JavaFX 8u60 开始，有一个 refresh TableView中的方法，这将允许您手动触发刷新:

private final Random random = new Random();

public void rollInitBtnClicked() {
    List<Players> targets = playersTable.getItems();

    for (Players p : targets) {
        p.setRoll(random.nextInt(20));
        // set total ect...
    }

    // update table
    playersTable.refresh();
}

但是，“也与旧版本 JavaFX 兼容的标准方法将修改属性:

private final IntegerProperty roll = new SimpleIntegerProperty();

public int getRoll() {
    return roll.get();
}

public void setRoll(int roll) {
    this.roll.set(roll);
}

public IntegerProperty rollProperty() {
    return this.roll;
}

// same modifications for other int properties
...

private final IntegerBinding total = Bindings.createIntegerBinding(() -> getRoll() + getOtherMod() + getDexMod(), roll, otherMod, dexMod);

public int getTotal() {
    return this.total.get();
}

public IntegerBinding totalProperty() {
    return this.total;
}

这将允许您删除 refresh调用rollInitBtnClicked上面发布了方法。

<小时/>

附加说明

1. 如果您使用类来存储单个玩家的数据，则不应将其命名为 Players ，但是Player .

2. 您的 TableColumn 使用了不正确的类型参数s。这在这里并不重要，因为 PropertyValueFactory无论类型参数如何，都可以工作，但如果您使用TableColumn的其他功能，它可能会给您带来问题。 。第二个类型参数应始终与ObservableValue的类型参数匹配。由 cellValueFactory 返回:

   TableColumn<Players, String> nameColumn
   TableColumn<Players, Number> dexColumn
   TableColumn<Players, Number> otherColumn
   TableColumn<Players, Number> rollColumn
   TableColumn<Players, Number> totalColumn