JavaFx 2.1、2.2 TableView更新问题 [英] JavaFx 2.1, 2.2 TableView update issue
本文介绍了JavaFx 2.1、2.2 TableView更新问题的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我的应用程序使用JPA将数据读取到TableView中，然后进行修改和显示.该表刷新了JavaFx 2.0.3下的修改记录.在JavaFx 2.1、2.2下，该表将不再刷新更新.我发现其他人也有类似的问题.我的计划是继续使用2.0.3，直到有人解决了2.1和2.2中的问题.现在我知道这不是错误，也不会得到解决.好吧，我不知道该如何处理.以下是从示例演示修改的代码以显示问题.如果我从表中添加新记录或删除旧记录，表将刷新正常.如果我修改一条记录，那么在执行添加，删除或排序操作之前，该表不会刷新更改.如果删除已修改的记录并再次添加，表将刷新.但是修改后的记录放在表格的按钮处.好吧，如果我删除修改后的记录，添加相同的记录，然后将记录移至原始位置，该表将不再刷新.以下是完整的代码，请对此进行说明.
My application uses JPA read data into TableView then modify and display them. The table refreshed modified record under JavaFx 2.0.3. Under JavaFx 2.1, 2.2, the table wouldn't refresh the update anymore. I found other people have similar issue. My plan was to continue using 2.0.3 until someone fixes the issue under 2.1 and 2.2. Now I know it is not a bug and wouldn't be fixed. Well, I don't know how to deal with this. Following are codes are modified from sample demo to show the issue. If I add a new record or delete a old record from table, table refreshes fine. If I modify a record, the table wouldn't refreshes the change until a add, delete or sort action is taken. If I remove the modified record and add it again, table refreshes. But the modified record is put at button of table. Well, if I remove the modified record, add the same record then move the record to the original spot, the table wouldn't refresh anymore. Below is a completely code, please shine some light on this.
import javafx.application.Application;
import javafx.beans.property.SimpleStringProperty;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.geometry.HPos;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.control.*;
import javafx.scene.control.cell.PropertyValueFactory;
import javafx.scene.layout.GridPane;
import javafx.scene.layout.HBox;
import javafx.scene.layout.VBox;
import javafx.scene.text.Font;
import javafx.stage.Modality;
import javafx.stage.Stage;
import javafx.stage.StageStyle;
public class Main extends Application {
private TextField firtNameField = new TextField();
private TextField lastNameField = new TextField();
private TextField emailField = new TextField();
private Stage editView;
private Person fPerson;
public static class Person {
private final SimpleStringProperty firstName;
private final SimpleStringProperty lastName;
private final SimpleStringProperty email;
private Person(String fName, String lName, String email) {
this.firstName = new SimpleStringProperty(fName);
this.lastName = new SimpleStringProperty(lName);
this.email = new SimpleStringProperty(email);
}
public String getFirstName() {
return firstName.get();
}
public void setFirstName(String fName) {
firstName.set(fName);
}
public String getLastName() {
return lastName.get();
}
public void setLastName(String fName) {
lastName.set(fName);
}
public String getEmail() {
return email.get();
}
public void setEmail(String fName) {
email.set(fName);
}
}
private TableView<Person> table = new TableView<Person>();
private final ObservableList<Person> data =
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 static void main(String[] args) {
launch(args);
}
@Override
public void start(Stage stage) {
Scene scene = new Scene(new Group());
stage.setTitle("Table View Sample");
stage.setWidth(535);
stage.setHeight(535);
editView = new Stage();
final Label label = new Label("Address Book");
label.setFont(new Font("Arial", 20));
TableColumn firstNameCol = new TableColumn("First Name");
firstNameCol.setCellValueFactory(
new PropertyValueFactory<Person, String>("firstName"));
firstNameCol.setMinWidth(150);
TableColumn lastNameCol = new TableColumn("Last Name");
lastNameCol.setCellValueFactory(
new PropertyValueFactory<Person, String>("lastName"));
lastNameCol.setMinWidth(150);
TableColumn emailCol = new TableColumn("Email");
emailCol.setMinWidth(200);
emailCol.setCellValueFactory(
new PropertyValueFactory<Person, String>("email"));
table.setItems(data);
table.getColumns().addAll(firstNameCol, lastNameCol, emailCol);
//--- create a edit button and a editPane to edit person
Button addButton = new Button("Add");
addButton.setOnAction(new EventHandler<ActionEvent>() {
@Override
public void handle(ActionEvent event) {
fPerson = null;
firtNameField.setText("");
lastNameField.setText("");
emailField.setText("");
editView.show();
}
});
Button editButton = new Button("Edit");
editButton.setOnAction(new EventHandler<ActionEvent>() {
@Override
public void handle(ActionEvent event) {
if (table.getSelectionModel().getSelectedItem() != null) {
fPerson = table.getSelectionModel().getSelectedItem();
firtNameField.setText(fPerson.getFirstName());
lastNameField.setText(fPerson.getLastName());
emailField.setText(fPerson.getEmail());
editView.show();
}
}
});
Button deleteButton = new Button("Delete");
deleteButton.setOnAction(new EventHandler<ActionEvent>() {
@Override
public void handle(ActionEvent event) {
if (table.getSelectionModel().getSelectedItem() != null) {
data.remove(table.getSelectionModel().getSelectedItem());
}
}
});
HBox addEditDeleteButtonBox = new HBox();
addEditDeleteButtonBox.getChildren().addAll(addButton, editButton, deleteButton);
addEditDeleteButtonBox.setAlignment(Pos.CENTER_RIGHT);
addEditDeleteButtonBox.setSpacing(3);
GridPane editPane = new GridPane();
editPane.getStyleClass().add("editView");
editPane.setPadding(new Insets(3));
editPane.setHgap(5);
editPane.setVgap(5);
Label personLbl = new Label("Person:");
editPane.add(personLbl, 0, 1);
GridPane.setHalignment(personLbl, HPos.LEFT);
firtNameField.setPrefWidth(250);
lastNameField.setPrefWidth(250);
emailField.setPrefWidth(250);
Label firstNameLabel = new Label("First Name:");
Label lastNameLabel = new Label("Last Name:");
Label emailLabel = new Label("Email:");
editPane.add(firstNameLabel, 0, 3);
editPane.add(firtNameField, 1, 3);
editPane.add(lastNameLabel, 0, 4);
editPane.add(lastNameField, 1, 4);
editPane.add(emailLabel, 0, 5);
editPane.add(emailField, 1, 5);
GridPane.setHalignment(firstNameLabel, HPos.RIGHT);
GridPane.setHalignment(lastNameLabel, HPos.RIGHT);
GridPane.setHalignment(emailLabel, HPos.RIGHT);
Button saveButton = new Button("Save");
saveButton.setOnAction(new EventHandler<ActionEvent>() {
@Override
public void handle(ActionEvent event) {
if (fPerson == null) {
fPerson = new Person(
firtNameField.getText(),
lastNameField.getText(),
emailField.getText());
data.add(fPerson);
} else {
int k = -1;
if (data.size() > 0) {
for (int i = 0; i < data.size(); i++) {
if (data.get(i) == fPerson) {
k = i;
}
}
}
fPerson.setFirstName(firtNameField.getText());
fPerson.setLastName(lastNameField.getText());
fPerson.setEmail(emailField.getText());
data.set(k, fPerson);
table.setItems(data);
// The following will work, but edited person has to be added to the button
//
// data.remove(fPerson);
// data.add(fPerson);
// add and remove refresh the table, but now move edited person to original spot,
// it failed again with the following code
// while (data.indexOf(fPerson) != k) {
// int i = data.indexOf(fPerson);
// Collections.swap(data, i, i - 1);
// }
}
editView.close();
}
});
Button cancelButton = new Button("Cancel");
cancelButton.setOnAction(new EventHandler<ActionEvent>() {
@Override
public void handle(ActionEvent event) {
editView.close();
}
});
HBox saveCancelButtonBox = new HBox();
saveCancelButtonBox.getChildren().addAll(saveButton, cancelButton);
saveCancelButtonBox.setAlignment(Pos.CENTER_RIGHT);
saveCancelButtonBox.setSpacing(3);
VBox editBox = new VBox();
editBox.getChildren().addAll(editPane, saveCancelButtonBox);
Scene editScene = new Scene(editBox);
editView.setTitle("Person");
editView.initStyle(StageStyle.UTILITY);
editView.initModality(Modality.APPLICATION_MODAL);
editView.setScene(editScene);
editView.close();
final VBox vbox = new VBox();
vbox.setSpacing(5);
vbox.getChildren().addAll(label, table, addEditDeleteButtonBox);
vbox.setPadding(new Insets(10, 0, 0, 10));
((Group) scene.getRoot()).getChildren().addAll(vbox);
stage.setScene(scene);
stage.show();
}
}
推荐答案
查看TableView.java代码，有一个私有的refresh()可以执行
looking into the TableView.java code, there's private refresh() which just executes
getProperties().put(TableViewSkinBase.REFRESH, Boolean.TRUE);
最后，下面的代码为我工作(Java8). (请注意，常量的名称不是REFRESH而是RECREATE)
At last, the code below worked for me(Java8). (be careful, the constant's name is not REFRESH but RECREATE)
tableView.getProperties().put(TableViewSkinBase.RECREATE, Boolean.TRUE);
(读取javafx的代码，这将强制重新创建单元格)
(reading javafx's code, this will force cell re-creation)
这篇关于JavaFx 2.1、2.2 TableView更新问题的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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