JavaFX - 场景 - 修改另一个场景中的变量

Question

我有一个可以创建数据的场景，现在我想把它放到我的 TableView "TV_currency" 中。

但是这个是另一个已经打开的场景，我不想关闭并重新打开这个场景。

你能看看吗？

控制器选项.java (TV_currency在这里( ：

public class ControllerOptions implements Initializable{
//VARIABLES    
@FXML private   TableView<Currency> TV_currency;
@FXML private   TableColumn<Currency, String> TC_name;
@FXML private   TableColumn<Currency, Double> TC_value;
private ObservableList<Currency> currencies = FXCollections.observableArrayList();
//FUNCTIONS
@Override
public void initialize(URL location, ResourceBundle rb){
//initialisation Table Currencies
for (Currency currency : Datas.getInstance().getCurrencies()) {
currencies.add(currency);
}       
TC_name.setCellValueFactory(new PropertyValueFactory<Currency, String>("name"));
TC_value.setCellValueFactory(new PropertyValueFactory<Currency, Double>("value"));
TV_currency.setItems(currencies); //TODO Corriger setItems() de la TableView
}
@FXML void add_currency(MouseEvent event) throws IOException {
FXMLLoader fxmlLoader = new FXMLLoader(getClass().getResource("options/currency_add.fxml"));
Parent root1 = (Parent) fxmlLoader.load();
Stage stage = new Stage();
stage.initModality(Modality.APPLICATION_MODAL);
stage.initStyle(StageStyle.UNDECORATED);
stage.setTitle("Add new currency");
stage.setScene(new Scene(root1));  
stage.setFullScreen(true);
stage.show();
}
@FXML void open_options(ActionEvent event) throws IOException {
Group actor = new Group();
actor.getChildren().add(FXMLLoader.load(getClass().getResource("options.fxml")));
com.courieux.wheresmymoney.Main.setScene(actor, "Where's My Money");
}
}

ControllerCurrencyAdd.java(我想编辑TV_currency(：

public class ControllerCurrencyAdd {
@FXML private TextField TF_name;
@FXML private TextField TF_value;
@FXML private TextField TF_acronym;
@FXML
void add(ActionEvent event) {
Currency currency = new Currency(TF_name.getText(), Double.valueOf(TF_value.getText()));
Datas.getInstance().addCurrency(currency);
//==> HERE I NEED TO EDIT VARIABLES BELOW <==
//currencies.setAll(Datas.getInstance().getCurrencies());
//TV_currency.setItems(currencies);
}
}

数据.java ：

public class Datas {
//SINGLETON PATTERN
private Datas() {}
private static Datas INSTANCE = new Datas();    
public static Datas getInstance(){
return INSTANCE;
}
//END SINGLETON PATTERN
//VARS
private List<Currency> currencies = new ArrayList<>();
//FUNCTIONS - Add/Edit/Delete
public void addCurrency(Currency currency){
currencies.add(currency);
}
//FUNCTIONS - getter/setters
public List<Currency> getCurrencies() {
return currencies;
}
public void setCurrencies(List<Currency> currencies) {
this.currencies = currencies;
}
}

货币.java ：

public class Currency {
//VARS
private     String      name;
private     double      value;
//FUNCTIONS - constructors
public Currency(String name, double value) {
setName(name);
setValue(value);
}
//FUNCTIONS
public boolean equals(Currency currency){
if(this.name == currency.getName()
&& this.value == currency.getValue()){
return true;
} else {
return false;
}
}
//FUNCTIONS - getters/setters
public void setName(String name) {
this.name = name;
}
public String getName() {
return name;
}
public void setValue(double value) {
this.value = value;
}
public double getValue() {
return value;
}
}

然后我想将新数据放入 ObservableList "货币"中并使用它设置TV_currency。

提前感谢！

Answer 1

您可以对代码进行的最简单更改是让您的单例类保存ObservableList而不是List。然后，您可以直接在表视图中使用它，并直接在其他控制器中更新它。由于表视图观察其支持列表，因此对可观察列表的更改将立即反映在表中。

即

import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
public class Datas {
// SINGLETON PATTERN
private Datas() {
}
private static Datas INSTANCE = new Datas();
public static Datas getInstance() {
return INSTANCE;
}
// END SINGLETON PATTERN
// VARS
private ObservableList<Currency> currencies = FXCollections.observableArrayList();
// FUNCTIONS - Add/Edit/Delete
public void addCurrency(Currency currency) {
currencies.add(currency);
}
// FUNCTIONS - getter/setters
public ObservableList<Currency> getCurrencies() {
return currencies;
}
}

然后

import java.io.IOException;
import java.net.URL;
import java.util.ResourceBundle;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.FXMLLoader;
import javafx.fxml.Initializable;
import javafx.scene.Group;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
import javafx.scene.control.cell.PropertyValueFactory;
import javafx.scene.input.MouseEvent;
import javafx.stage.Modality;
import javafx.stage.Stage;
import javafx.stage.StageStyle;
public class ControllerOptions implements Initializable {
// VARIABLES
@FXML
private TableView<Currency> TV_currency;
@FXML
private TableColumn<Currency, String> TC_name;
@FXML
private TableColumn<Currency, Double> TC_value;
private ObservableList<Currency> currencies = FXCollections.observableArrayList();
// FUNCTIONS
@Override
public void initialize(URL location, ResourceBundle rb) {
// initialisation Table Currencies
TC_name.setCellValueFactory(new PropertyValueFactory<Currency, String>("name"));
TC_value.setCellValueFactory(new PropertyValueFactory<Currency, Double>("value"));
// Note how the list from Datas is used directly in the table:
TV_currency.setItems(Datas.getInstance().getCurrencies()); 
}
@FXML
void add_currency(MouseEvent event) throws IOException {
FXMLLoader fxmlLoader = new FXMLLoader(getClass().getResource("options/currency_add.fxml"));
Parent root1 = (Parent) fxmlLoader.load();
Stage stage = new Stage();
stage.initModality(Modality.APPLICATION_MODAL);
stage.initStyle(StageStyle.UNDECORATED);
stage.setTitle("Add new currency");
stage.setScene(new Scene(root1));
stage.setFullScreen(true);
stage.show();
}
@FXML
void open_options(ActionEvent event) throws IOException {
Group actor = new Group();
actor.getChildren().add(FXMLLoader.load(getClass().getResource("options.fxml")));
Main.setScene(actor, "Where's My Money");
}
}

和

import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.scene.control.TextField;
public class ControllerCurrencyAdd {
@FXML
private TextField TF_name;
@FXML
private TextField TF_value;
@FXML
private TextField TF_acronym;
@FXML
void add(ActionEvent event) {
Currency currency = new Currency(TF_name.getText(), Double.valueOf(TF_value.getText()));
// since we update the list used as the table's backing list, the table will automatically update:
Datas.getInstance().addCurrency(currency);
}
}

您的Datas类被视为 MVC(和相关(设计模式中的"模型"。通常，将其设置为单例可能会在以后修改应用程序方面有所限制(许多程序员认为这是一种反模式(。您可以考虑将其设置为常规类，并使用依赖关系注入技术为每个控制器提供对同一实例的访问权限。