JavaFx: I need something similar to this but for a TableView instead of a ListView - tableview

Question

I took a stab at this yesterday but the TableView documentation has me a bit confused. After working on it for a couple of hours I gave up. Just wondering if any javafx experts out there can help me with this. I want to update a TableView in a background thread periodically when items in my database change.
Rather than post my entire application I have tried to break it down to a simple example. Replace all occurrences of ListView with TableView and ....
Then what?
import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.IntStream;
import java.util.stream.Stream;
import javafx.application.Application;
import javafx.application.Platform;
import javafx.event.Event;
import javafx.event.EventType;
import javafx.scene.Scene;
import javafx.scene.control.ListView;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;
/**
* An example of triggering a JavaFX ListView when an item is modified.
*
* Displays a list of strings. It iterates through the strings adding
* exclamation marks with 2 second pauses in between. Each modification is
* accompanied by firing an event to indicate to the ListView that the value
* has been modified.
*
* #author Mark Fashing
*/
public class ListViewTest extends Application {
/**
* Informs the ListView that one of its items has been modified.
*
* #param listView The ListView to trigger.
* #param newValue The new value of the list item that changed.
* #param i The index of the list item that changed.
*/
public static <T> void triggerUpdate(ListView<T> listView, T newValue, int i) {
EventType<? extends ListView.EditEvent<T>> type = ListView.editCommitEvent();
Event event = new ListView.EditEvent<>(listView, type, newValue, i);
listView.fireEvent(event);
}
#Override
public void start(Stage primaryStage) {
// Create a list of mutable data. StringBuffer works nicely.
final List<StringBuffer> listData = Stream.of("Fee", "Fi", "Fo", "Fum")
.map(StringBuffer::new)
.collect(Collectors.toList());
final ListView<StringBuffer> listView = new ListView<>();
listView.getItems().addAll(listData);
final StackPane root = new StackPane();
root.getChildren().add(listView);
primaryStage.setScene(new Scene(root));
primaryStage.show();
// Modify an item in the list every 2 seconds.
new Thread(() -> {
IntStream.range(0, listData.size()).forEach(i -> {
try {
Thread.sleep(2000);
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println(listData.get(i));
Platform.runLater(() -> {
// Where the magic happens.
listData.get(i).append("!");
triggerUpdate(listView, listData.get(i), i);
});
});
}).start();
}
public static void main(String[] args) {
launch(args);
}
}
Here is my first attempt:
Create a person class....
package org.pauquette.example;
import javafx.beans.property.SimpleStringProperty;
public class Person {
private final SimpleStringProperty email;
private final SimpleStringProperty firstName;
private final SimpleStringProperty lastName;
Person(String fName, String lName, String email) {
this.firstName = new SimpleStringProperty(fName);
this.lastName = new SimpleStringProperty(lName);
this.email = new SimpleStringProperty(email);
}
public String getEmail() {
return email.get();
}
public String getFirstName() {
return firstName.get();
}
public String getLastName() {
return lastName.get();
}
public void setEmail(String fName) {
email.set(fName);
}
public void setFirstName(String fName) {
firstName.set(fName);
}
public void setLastName(String fName) {
lastName.set(fName);
}
}
Create an extremely simple model class...
package org.pauquette.example;
import javafx.collections.*;
public class PeopleModel {
private ObservableList<Person> people=FXCollections.observableArrayList(
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")
);
public ObservableList<Person> getPeople() {
return people;
}
}
Now create a TableView of just firstName and build the columns then update the firstName every 2 seconds.......
package org.pauquette.example;
import java.util.stream.IntStream;
import javafx.application.Application;
import javafx.application.Platform;
import javafx.collections.ObservableList;
import javafx.scene.Scene;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
import javafx.scene.control.cell.PropertyValueFactory;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;
/**
* An example of triggering a JavaFX TableView when an item is modified.
*
* Displays a list of strings. It iterates through the strings adding
* exclamation marks with 2 second pauses in between. Each modification is
* accompanied by firing an event to indicate to the TableView that the value
* has been modified.
*
* #author Mark Fashing-Modified for TableView by Bryan Pauquette
*/
public class TableViewTest extends Application {
/*
public static <T> void triggerUpdate(TableView<T> listView, T newValue, int i) {
EventType<? extends TableView.EditEvent<T>> type = TableView.editCommitEvent();
Event event = new TableView.EditEvent<>(listView, type, newValue, i);
listView.fireEvent(event);
}*/
#Override
public void start(Stage primaryStage) {
final TableView<Person> listView = new TableView<Person>();
final PeopleModel model=new PeopleModel();
final ObservableList<Person> listData=model.getPeople();
listView.getItems().addAll(listData);
final StackPane root = new StackPane();
buildColumns(listView,listData);
root.getChildren().add(listView);
primaryStage.setScene(new Scene(root));
primaryStage.show();
// Modify an item in the list every 2 seconds.
new Thread(() -> {
IntStream.range(0, listData.size()).forEach(i -> {
try {
Thread.sleep(2000);
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println(listData.get(i));
Platform.runLater(() -> {
// Where the magic happens.
Person p=listData.get(i);
p.setFirstName(new StringBuilder(p.getFirstName()).append("!").toString());
//triggerUpdate(listView, listData.get(i), i);
});
});
}).start();
}
private void buildColumns(TableView<Person> listView,ObservableList<Person> listData) {
TableColumn<Person, String> dataCol = new TableColumn<Person, String>("First Name");
dataCol.setCellValueFactory(new PropertyValueFactory<Person, String>("firstName"));
listView.getColumns().add(dataCol);
listView.setItems(listData);
}
public static void main(String[] args) {
launch(args);
}
}
The method I am struggling with is triggerUpdate.....
I want the firstName column to get updated in the view with an appended exclamation point every 2 seconds just like in the original simple list view.

Answer 1

Here is working code.....
package org.pauquette.example;
import java.util.Observable;
import javafx.beans.property.SimpleStringProperty;
import javafx.beans.value.ObservableValue;
public class Person extends Observable {
private final SimpleStringProperty email;
private final SimpleStringProperty firstName;
private final SimpleStringProperty lastName;
Person(String fName, String lName, String email) {
this.firstName = new SimpleStringProperty(fName);
this.lastName = new SimpleStringProperty(lName);
this.email = new SimpleStringProperty(email);
}
public String getEmail() {
return email.get();
}
public String getFirstName() {
return firstName.get();
}
public String getLastName() {
return lastName.get();
}
public void setEmail(String emailIn) {
email.setValue(emailIn);
setChanged();
notifyObservers(email);
}
public void setFirstName(String fNameIn) {
firstName.setValue(fNameIn);
setChanged();
notifyObservers(firstName);
}
public void setLastName(String lNameIn) {
lastName.setValue(lNameIn);
setChanged();
notifyObservers();
}
public ObservableValue<String> firstNameProperty() {
return firstName;
}
}
And......
package org.pauquette.example;
import java.util.stream.IntStream;
import javafx.application.Application;
import javafx.application.Platform;
import javafx.beans.value.ObservableValue;
import javafx.collections.ObservableList;
import javafx.scene.Scene;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableColumn.CellDataFeatures;
import javafx.scene.control.TableView;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;
import javafx.util.Callback;
/**
* An example of triggering a JavaFX TableView when an item is modified.
*
* Displays a list of strings. It iterates through the strings adding
* exclamation marks with 2 second pauses in between. Each modification is
* accompanied by firing an event to indicate to the TableView that the value
* has been modified.
*
* #author Mark Fashing-Modified for TableView by Bryan Pauquette
*/
public class TableViewTest extends Application {
/*
public static <T> void triggerUpdate(TableView<T> listView, T newValue, int i) {
EventType<? extends TableView.EditEvent<T>> type = TableView.editCommitEvent();
Event event = new TableView.EditEvent<>(listView, type, newValue, i);
listView.fireEvent(event);
}*/
#Override
public void start(Stage primaryStage) {
final TableView<Person> listView = new TableView<Person>();
final PeopleModel model=new PeopleModel();
final ObservableList<Person> listData=model.getPeople();
/* int row=0;
for (Person p : listData) {
p.addObserver(new PersonObserver(listView,row));
row++;
}*/
listView.getItems().addAll(listData);
final StackPane root = new StackPane();
buildColumns(listView,listData);
root.getChildren().add(listView);
primaryStage.setScene(new Scene(root));
primaryStage.show();
// Modify an item in the list every 2 seconds.
new Thread(() -> {
IntStream.range(0, listData.size()).forEach(i -> {
try {
Thread.sleep(2000);
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println(listData.get(i));
Platform.runLater(() -> {
// Where the magic happens.
Person p=listData.get(i);
p.setFirstName(new StringBuilder(p.getFirstName()).append("!").toString());
//triggerUpdate(listView, listData.get(i), i);
});
});
}).start();
}
private void buildColumns(TableView<Person> listView,ObservableList<Person> listData) {
TableColumn<Person, String> dataCol = new TableColumn<Person, String>("First Name");
//dataCol.setCellValueFactory(new PropertyValueFactory<Person, String>("firstName"));
dataCol.setCellValueFactory(new Callback<CellDataFeatures<Person, String>, ObservableValue<String>>() {
public ObservableValue<String> call(CellDataFeatures<Person, String> p) {
// p.getValue() returns the Person instance for a particular TableView row
return p.getValue().firstNameProperty();
}
});
listView.getColumns().add(dataCol);
listView.setItems(listData);
}
public static void main(String[] args) {
launch(args);
}
}