Javafx：检测对tableView所做的所有更改，包括添加/删除表行以及对任何表行的单元格编辑
假设我有一个tableView，我如何跟踪所有更改，即添加/删除新行，其中一个表格单元格的值已更改，并在检测到任何这些更改时触发同一事件 目前，我有下面的代码，它只在我添加一行时检测到更改。当我编辑任何行的表格单元格和删除行时，它无法检测到更改Javafx：检测对tableView所做的所有更改，包括添加/删除表行以及对任何表行的单元格编辑,java,javafx,Java,Javafx,假设我有一个tableView，我如何跟踪所有更改，即添加/删除新行，其中一个表格单元格的值已更改，并在检测到任何这些更改时触发同一事件 目前，我有下面的代码，它只在我添加一行时检测到更改。当我编辑任何行的表格单元格和删除行时，它无法检测到更改 ObservableList<Trade> observableListOfTrades =FXCollections.observableArrayList(); observableListOfTrades.add(n
ObservableList<Trade> observableListOfTrades =FXCollections.observableArrayList();
observableListOfTrades.add(newTrade);
fxTransactionLog.getItems().add(observableListOfTrades.get(observableListOfTrades.size()-1));
observableListOfTrades.addListener(new ListChangeListener() {
@Override
public void onChanged(ListChangeListener.Change change) {
System.out.println("Detected a change! ");
}
});
您的侦听器应该对删除的项目做出响应；如果不是，那么您没有显示的代码可能有问题 要使ListChangeListener响应属于列表元素的属性更新，您需要创建列表，并指定一个 提取器是一个函数，它接受列表中的一个元素，并返回一个可观察值数组。然后，列表观察该数组中的所有值，如果值发生更改，则向列表的侦听器触发更新事件 因此，如果您希望在任何属性发生更改时通知您的侦听器，您可以这样做
ObservableList<Trade> observableListOfTrades =FXCollections.observableArrayList(trade ->
new Observable[] {
trade.transactionDateProperty(),
trade.itemNameProperty(),
trade.buySellProperty(),
trade.volumeProperty(),
trade.priceProperty().
trade.transactionFeeProperty()
});
import java.util.function.Function;
import javafx.application.Application;
import javafx.beans.Observable;
import javafx.beans.binding.Bindings;
import javafx.beans.property.SimpleStringProperty;
import javafx.beans.property.StringProperty;
import javafx.beans.value.ObservableValue;
import javafx.collections.FXCollections;
import javafx.collections.ListChangeListener.Change;
import javafx.collections.ObservableList;
import javafx.geometry.HPos;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
import javafx.scene.control.TextField;
import javafx.scene.control.cell.TextFieldTableCell;
import javafx.scene.layout.ColumnConstraints;
import javafx.scene.layout.GridPane;
import javafx.scene.layout.Priority;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;
public class TableViewWithUpdateListenerExample extends Application {
@Override
public void start(Stage primaryStage) {
// Create an observable list with an extractor. This will ensure
// listeners on the list receive notifications if any of the
// properties returned by the extractor belonging to a list element
// are changed:
ObservableList<Person> data = FXCollections.observableArrayList(person ->
new Observable[] {
person.firstNameProperty(),
person.lastNameProperty(),
person.emailProperty()
});
data.addListener((Change<? extends Person> c) -> {
while (c.next()) {
if (c.wasAdded()) {
System.out.println("Added:");
c.getAddedSubList().forEach(System.out::println);
System.out.println();
}
if (c.wasRemoved()) {
System.out.println("Removed:");
c.getRemoved().forEach(System.out::println);
System.out.println();
}
if (c.wasUpdated()) {
System.out.println("Updated:");
data.subList(c.getFrom(), c.getTo()).forEach(System.out::println);
System.out.println();
}
}
});
data.addAll(
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")
);
TableView<Person> tableView = new TableView<>();
tableView.setEditable(true);
tableView.setItems(data);
tableView.getColumns().add(column("First Name", Person::firstNameProperty));
tableView.getColumns().add(column("Last Name", Person::lastNameProperty));
tableView.getColumns().add(column("Email", Person::emailProperty));
TextField firstNameTF = new TextField();
TextField lastNameTF = new TextField();
TextField emailTF = new TextField();
Button addButton = new Button("Add");
addButton.setOnAction(e -> {
Person person = new Person(firstNameTF.getText(), lastNameTF.getText(), emailTF.getText());
firstNameTF.setText("");
lastNameTF.setText("");
emailTF.setText("");
data.add(person);
});
GridPane editPane = new GridPane();
editPane.addRow(0, new Label("First Name:"), firstNameTF);
editPane.addRow(1, new Label("Last Name:"), lastNameTF);
editPane.addRow(2, new Label("Email:"), emailTF);
editPane.add(addButton, 0, 3, 2, 1);
ColumnConstraints leftCol = new ColumnConstraints();
leftCol.setHalignment(HPos.RIGHT);
leftCol.setHgrow(Priority.NEVER);
editPane.setHgap(10);
editPane.setVgap(5);
editPane.getColumnConstraints().addAll(leftCol, new ColumnConstraints());
Button deleteButton = new Button("Delete");
deleteButton.setOnAction(e -> data.remove(tableView.getSelectionModel().getSelectedItem()));
deleteButton.disableProperty().bind(Bindings.isEmpty(tableView.getSelectionModel().getSelectedItems()));
VBox root = new VBox(10, tableView, editPane, deleteButton);
root.setAlignment(Pos.CENTER);
primaryStage.setScene(new Scene(root, 800, 600));
primaryStage.show();
}
private TableColumn<Person, String> column(String title, Function<Person, ObservableValue<String>> property) {
TableColumn<Person, String> col = new TableColumn<>(title);
col.setCellValueFactory(cellData -> property.apply(cellData.getValue()));
col.setCellFactory(TextFieldTableCell.forTableColumn());
return col ;
}
public static class Person {
private final StringProperty firstName = new SimpleStringProperty() ;
private final StringProperty lastName = new SimpleStringProperty() ;
private final StringProperty email = new SimpleStringProperty() ;
public Person(String firstName, String lastName, String email) {
setFirstName(firstName);
setLastName(lastName);
setEmail(email);
}
public final StringProperty firstNameProperty() {
return this.firstName;
}
public final java.lang.String getFirstName() {
return this.firstNameProperty().get();
}
public final void setFirstName(final java.lang.String firstName) {
this.firstNameProperty().set(firstName);
}
public final StringProperty lastNameProperty() {
return this.lastName;
}
public final java.lang.String getLastName() {
return this.lastNameProperty().get();
}
public final void setLastName(final java.lang.String lastName) {
this.lastNameProperty().set(lastName);
}
public final StringProperty emailProperty() {
return this.email;
}
public final java.lang.String getEmail() {
return this.emailProperty().get();
}
public final void setEmail(final java.lang.String email) {
this.emailProperty().set(email);
}
@Override
public String toString() {
return getFirstName() + " " + getLastName() + " (" + getEmail() +")";
}
}
public static void main(String[] args) {
launch(args);
}
}
您的侦听器应该对删除的项目做出响应；如果不是，那么您没有显示的代码可能有问题 要使ListChangeListener响应属于列表元素的属性更新，您需要创建列表，并指定一个 提取器是一个函数，它接受列表中的一个元素，并返回一个可观察值数组。然后，列表观察该数组中的所有值，如果值发生更改，则向列表的侦听器触发更新事件 因此，如果您希望在任何属性发生更改时通知您的侦听器，您可以这样做
ObservableList<Trade> observableListOfTrades =FXCollections.observableArrayList(trade ->
new Observable[] {
trade.transactionDateProperty(),
trade.itemNameProperty(),
trade.buySellProperty(),
trade.volumeProperty(),
trade.priceProperty().
trade.transactionFeeProperty()
});
import java.util.function.Function;
import javafx.application.Application;
import javafx.beans.Observable;
import javafx.beans.binding.Bindings;
import javafx.beans.property.SimpleStringProperty;
import javafx.beans.property.StringProperty;
import javafx.beans.value.ObservableValue;
import javafx.collections.FXCollections;
import javafx.collections.ListChangeListener.Change;
import javafx.collections.ObservableList;
import javafx.geometry.HPos;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
import javafx.scene.control.TextField;
import javafx.scene.control.cell.TextFieldTableCell;
import javafx.scene.layout.ColumnConstraints;
import javafx.scene.layout.GridPane;
import javafx.scene.layout.Priority;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;
public class TableViewWithUpdateListenerExample extends Application {
@Override
public void start(Stage primaryStage) {
// Create an observable list with an extractor. This will ensure
// listeners on the list receive notifications if any of the
// properties returned by the extractor belonging to a list element
// are changed:
ObservableList<Person> data = FXCollections.observableArrayList(person ->
new Observable[] {
person.firstNameProperty(),
person.lastNameProperty(),
person.emailProperty()
});
data.addListener((Change<? extends Person> c) -> {
while (c.next()) {
if (c.wasAdded()) {
System.out.println("Added:");
c.getAddedSubList().forEach(System.out::println);
System.out.println();
}
if (c.wasRemoved()) {
System.out.println("Removed:");
c.getRemoved().forEach(System.out::println);
System.out.println();
}
if (c.wasUpdated()) {
System.out.println("Updated:");
data.subList(c.getFrom(), c.getTo()).forEach(System.out::println);
System.out.println();
}
}
});
data.addAll(
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")
);
TableView<Person> tableView = new TableView<>();
tableView.setEditable(true);
tableView.setItems(data);
tableView.getColumns().add(column("First Name", Person::firstNameProperty));
tableView.getColumns().add(column("Last Name", Person::lastNameProperty));
tableView.getColumns().add(column("Email", Person::emailProperty));
TextField firstNameTF = new TextField();
TextField lastNameTF = new TextField();
TextField emailTF = new TextField();
Button addButton = new Button("Add");
addButton.setOnAction(e -> {
Person person = new Person(firstNameTF.getText(), lastNameTF.getText(), emailTF.getText());
firstNameTF.setText("");
lastNameTF.setText("");
emailTF.setText("");
data.add(person);
});
GridPane editPane = new GridPane();
editPane.addRow(0, new Label("First Name:"), firstNameTF);
editPane.addRow(1, new Label("Last Name:"), lastNameTF);
editPane.addRow(2, new Label("Email:"), emailTF);
editPane.add(addButton, 0, 3, 2, 1);
ColumnConstraints leftCol = new ColumnConstraints();
leftCol.setHalignment(HPos.RIGHT);
leftCol.setHgrow(Priority.NEVER);
editPane.setHgap(10);
editPane.setVgap(5);
editPane.getColumnConstraints().addAll(leftCol, new ColumnConstraints());
Button deleteButton = new Button("Delete");
deleteButton.setOnAction(e -> data.remove(tableView.getSelectionModel().getSelectedItem()));
deleteButton.disableProperty().bind(Bindings.isEmpty(tableView.getSelectionModel().getSelectedItems()));
VBox root = new VBox(10, tableView, editPane, deleteButton);
root.setAlignment(Pos.CENTER);
primaryStage.setScene(new Scene(root, 800, 600));
primaryStage.show();
}
private TableColumn<Person, String> column(String title, Function<Person, ObservableValue<String>> property) {
TableColumn<Person, String> col = new TableColumn<>(title);
col.setCellValueFactory(cellData -> property.apply(cellData.getValue()));
col.setCellFactory(TextFieldTableCell.forTableColumn());
return col ;
}
public static class Person {
private final StringProperty firstName = new SimpleStringProperty() ;
private final StringProperty lastName = new SimpleStringProperty() ;
private final StringProperty email = new SimpleStringProperty() ;
public Person(String firstName, String lastName, String email) {
setFirstName(firstName);
setLastName(lastName);
setEmail(email);
}
public final StringProperty firstNameProperty() {
return this.firstName;
}
public final java.lang.String getFirstName() {
return this.firstNameProperty().get();
}
public final void setFirstName(final java.lang.String firstName) {
this.firstNameProperty().set(firstName);
}
public final StringProperty lastNameProperty() {
return this.lastName;
}
public final java.lang.String getLastName() {
return this.lastNameProperty().get();
}
public final void setLastName(final java.lang.String lastName) {
this.lastNameProperty().set(lastName);
}
public final StringProperty emailProperty() {
return this.email;
}
public final java.lang.String getEmail() {
return this.emailProperty().get();
}
public final void setEmail(final java.lang.String email) {
this.emailProperty().set(email);
}
@Override
public String toString() {
return getFirstName() + " " + getLastName() + " (" + getEmail() +")";
}
}
public static void main(String[] args) {
launch(args);
}
}
您的交易类是否使用JavaFX属性？你能把那门课的代码贴出来吗？是的。Trade类包含使用JavaFX属性的变量。例如，private ObjectProperty transactionDate；私有财产项目名称；私有财产买卖；私人物业数量；私人物业价格；简单的回答是用提取器创建“可观察列表”。当我回到电脑前，我会发布一个真实的答案。非常感谢！期待你的回答！您的交易类是否使用JavaFX属性？你能把那门课的代码贴出来吗？是的。Trade类包含使用JavaFX属性的变量。例如，private ObjectProperty transactionDate；私有财产项目名称；私有财产买卖；私人物业数量；私人物业价格；简单的回答是用提取器创建“可观察列表”。当我回到电脑前，我会发布一个真实的答案。非常感谢！期待你的回答！感谢回答得好！我还是javafx新手，我有几个问题，1。这是什么意思？什么意思？一个人？2.deleteButton.disableProperty.Bindings.isEmptytableView.getSelectionModel.getSelectedItems的作用是什么；你的意思是什么？3.cellData->property.applycellData.getValue是什么？这段代码到底在做什么？这些与您最初的问题无关。1.这个人是一个。2当选择为空时，数据启用按钮。请参阅Javadocs和3设置列的单元格值工厂。看，谢谢！回答得好！我还是javafx新手，我有几个问题，1。这是什么意思？什么意思？一个人？2.deleteButton.disableProperty.Bindings.isEmptytableView.getSelectionModel.getSelectedItems的作用是什么；你的意思是什么？3.cellData->property.applycellData.getValue是什么？这段代码到底在做什么？这些与您最初的问题无关。1.这个人是一个。2当选择为空时，数据启用按钮。请参阅Javadocs和3设置列的单元格值工厂。看见