Question

我一直在努力了解有关使用JavaFX的更多信息，并决定启动一个可以利用它的项目。现在，我对Java很新，并且正在自学。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设置好了，所以一个人可以在桌面视图中添加玩家名称和某些统计数据，但我现在想要添加一个随机滚动并添加dex和其他修饰符并填充表格视图它。这将驻留在rollInitBtnClicked()模块中。

请帮助我理解（因为上帝的爱解释它，所以初学者可以理解它）我需要做什么。

这是我的Main课程。

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;
}

}

以下活动名为Players。

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;
}

}

我很抱歉，如果这已被解决了40次但是新的我很难搞清楚并找出可能已经提供的解决方案。

Answer 1

首先需要将表格标记为可编辑

playersTable.setEditable(true);

您还需要更改任何可编辑列的单元格工厂。

nameColumn.setCellFactory(TextFieldTableCell.forTableColumn());

对于整数类型列，您还需要指定转换器。

otherColumn.setCellFactory(TextFieldTableCell.forTableColumn(new IntegerStringConverter()));
rollColumn.setCellFactory(TextFieldTableCell.forTableColumn(new IntegerStringConverter()));
totalColumn.setCellFactory(TextFieldTableCell.forTableColumn(new IntegerStringConverter()));

并修正从<Players, String>到<Players, Integer>的声明，即

TableColumn<Players, Integer> totalColumn = new TableColumn<>("Total");

您现在可以通过执行＆＃34;长按＆＃34;或按F2来编辑表格，就像标准应用程序一样...

可以在official tutorial

中找到更多信息

Answer 2

要使TableView收到修改通知，您需要将ObservableValue包装可用的属性值通知修改。 PropertyValueFactory使用方法<propertyName>Property()来检索此ObservableValue。如果不存在这样的方法，则使用getter;但是在这种情况下，TableView未通知任何修改。此外，total属性不应该自行修改。

从JavaFX 8u60开始，refresh中有一个TableView方法，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();
}

然而，“与旧版JavaFX兼容的标准方法是修改属性：

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;
}

这样您就可以从上面发布的refresh方法中移除rollInitBtnClicked来电。

附加说明

如果您使用的是一个类来存储单个播放器的数据，则不应将其命名为Players，而应命名为Player。
您使用TableColumn的错误类型参数。这在此并不重要，因为PropertyValueFactory无论类型参数如何都可以正常工作，但如果您使用TableColumn的其他功能，它可能会让您遇到问题。第二个类型参数应始终与ObservableValue返回的cellValueFactory的类型参数匹配：
```
TableColumn<Players, String> nameColumn
TableColumn<Players, Number> dexColumn
TableColumn<Players, Number> otherColumn
TableColumn<Players, Number> rollColumn
TableColumn<Players, Number> totalColumn
```

JavaFX：如何编辑现有的TableView条目

2 个答案:

附加说明