我有可编辑字段firstName,lastName和fullName的表。 我正在创建一个像这样的cellFactory和Column
public class SampleFX1 extends Application {
private TableView table = new TableView();
private final ObservableList<Person> data =
FXCollections.observableArrayList( new Person("balu", "Smith","1"), new Person("Isabella", "john","1"),
new Person("Ethan", "Williams","1"), new Person("Emma", "Jones","1"), new Person("Michael", "Brown","1"));
public static void main(String[] args) {
launch(args);
}
@Override
public void start(Stage stage) {
Scene scene = new Scene(new Group());
TableColumn firstNameCol = createSimpleFirstNameColumn();
TableColumn lastNameCol = createLastNameColumn();
TableColumn fullNameCol = createfullNameColumn();
table.setItems(data);
table.getColumns().addAll(firstNameCol, lastNameCol,fullNameCol);
table.setEditable(true);
((Group) scene.getRoot()).getChildren().addAll(table);
stage.setScene(scene);
stage.show();
}
private TableColumn createSimpleFirstNameColumn() {
TableColumn firstNameCol = new TableColumn("First Name");
firstNameCol.setMinWidth(100);
firstNameCol.setCellValueFactory(new PropertyValueFactory<Person, String>("firstName"));
firstNameCol.setCellFactory(TextFieldTableCell.forTableColumn());
firstNameCol.setOnEditCommit(new EventHandler<TableColumn.CellEditEvent<Person, String>>() {
@Override
public void handle(TableColumn.CellEditEvent<Person, String> t) {
t.getRowValue().setFirstName(t.getNewValue());
}
});
return firstNameCol;
}
private TableColumn createLastNameColumn() {
Callback<TableColumn, TableCell> editableFactory = new Callback<TableColumn, TableCell>() {
@Override
public TableCell call(TableColumn p) {
return new EditingCell();
}
};
TableColumn lastNameCol = new TableColumn("Last Name");
lastNameCol.setMinWidth(100);
lastNameCol.setCellValueFactory(new PropertyValueFactory<Person, String>("lastName"));
lastNameCol.setCellFactory(editableFactory);
lastNameCol.setOnEditCommit(new EventHandler<TableColumn.CellEditEvent<Person, String>>() {
@Override
public void handle(TableColumn.CellEditEvent<Person, String> t) {
System.out.println( "Commiting last name change. Previous: " + t.getOldValue() + " New: " + t.getNewValue() );
t.getRowValue().setLastName(t.getNewValue());
}
});
return lastNameCol;
}
private TableColumn createfullNameColumn() {
TableColumn firstNameCol = new TableColumn("full Name");
firstNameCol.setMinWidth(100);
firstNameCol.setCellValueFactory(new PropertyValueFactory<Person, String>("fullName"));
firstNameCol.setCellFactory(TextFieldTableCell.forTableColumn());
firstNameCol.setOnEditCommit(new EventHandler<TableColumn.CellEditEvent<Person, String>>() {
@Override
public void handle(TableColumn.CellEditEvent<Person, String> t) {
t.getRowValue().setfullName(t.getNewValue());
}
});
return firstNameCol;
}
}
编辑单元格:
public class EditingCell extends TableCell<Person, String> {
private TextField textField;
public EditingCell() {
}
@Override
public void startEdit() {
super.startEdit();
if( textField == null ) {
createTextField();
}
setText(null);
setGraphic(textField);
textField.selectAll();
}
@Override
public void cancelEdit() {
super.cancelEdit();
setText((String) getItem());
setGraphic(null);
}
@Override
public void updateItem(String item, boolean empty) {
super.updateItem(item, empty);
if (empty) {
setText(null);
setGraphic(null);
} else {
if (isEditing()) {
if (textField != null) {
textField.setText(getString());
}
setText(null);
setGraphic(textField);
} else {
setText(getString());
setGraphic(null);
}
}
}
private void createTextField() {
textField = new TextField(getString());
textField.setMinWidth(this.getWidth() - this.getGraphicTextGap() * 2);
textField.focusedProperty().addListener(new ChangeListener<Boolean>() {
@Override
public void changed(ObservableValue<? extends Boolean> arg0, Boolean arg1, Boolean arg2) {
if (!arg2) { commitEdit(textField.getText()); }
}
});
textField.setOnKeyReleased(new EventHandler<KeyEvent>() {
@Override
public void handle(KeyEvent t) {
if (t.getCode() == KeyCode.ENTER) {
String value = textField.getText();
if (value != null) { commitEdit(value); } else { commitEdit(null); }
} else if (t.getCode() == KeyCode.ESCAPE) {
cancelEdit();
}
}
});
}
private String getString() {
return getItem() == null ? "" : getItem().toString();
}
}
人类:
import javafx.beans.property.SimpleStringProperty;
public class Person {
private SimpleStringProperty firstName;
private SimpleStringProperty lastName;
private SimpleStringProperty fullName;
public Person(String firstName, String lastName ,String fullName) {
this.firstName = new SimpleStringProperty(firstName);
this.lastName = new SimpleStringProperty(lastName);
this.fullName=new SimpleStringProperty(fullName);
}
public String getFirstName() { return firstName.get(); }
public void setFirstName(String firstName) { this.firstName.set(firstName); }
public SimpleStringProperty firstNameProperty() { return firstName; }
public String getLastName() { return lastName.get(); }
public void setLastName(String lastName) { this.lastName.set(lastName); }
public SimpleStringProperty lastNameProperty() { return lastName; }
public String getfullName() { return fullName.get(); }
public void setfullName(String lastName) { this.fullName.set(lastName); }
public SimpleStringProperty fullNameProperty() { return fullName; }
}
问题:当我更新firstName列或姓氏列(可编辑单元格)而不插入行时,如何更新fullName列?
答案 0 :(得分:3)
使用绑定从名字和姓氏派生全名。
fullName.bind(Bindings.concat(this.firstName, " ", this.lastName));
Person.java
import javafx.beans.binding.Bindings;
import javafx.beans.property.ReadOnlyStringProperty;
import javafx.beans.property.ReadOnlyStringWrapper;
import javafx.beans.property.SimpleStringProperty;
public class Person {
private SimpleStringProperty firstName;
private SimpleStringProperty lastName;
private ReadOnlyStringWrapper fullName = new ReadOnlyStringWrapper();
public Person(String firstName, String lastName) {
this.firstName = new SimpleStringProperty(firstName);
this.lastName = new SimpleStringProperty(lastName);
fullName.bind(Bindings.concat(this.firstName, " ", this.lastName));
}
public String getFirstName() {
return firstName.get();
}
public void setFirstName(String firstName) {
this.firstName.set(firstName);
}
public SimpleStringProperty firstNameProperty() {
return firstName;
}
public String getLastName() {
return lastName.get();
}
public void setLastName(String lastName) {
this.lastName.set(lastName);
}
public SimpleStringProperty lastNameProperty() {
return lastName;
}
public String getFullName() {
return fullName.get();
}
public ReadOnlyStringProperty fullNameProperty() {
return fullName.getReadOnlyProperty();
}
}
重新定义createfullNameColumn()函数。现在,fullName表示它是连接firstName和lastName的派生值,不需要允许用户显式编辑它。
private TableColumn createfullNameColumn() {
TableColumn fullNameCol = new TableColumn("Full Name");
fullNameCol.setMinWidth(100);
fullNameCol.setCellValueFactory(new PropertyValueFactory<Person, String>("fullName"));
return fullNameCol;
}
SampleFX1.java
申请代码:
import javafx.application.Application;
import javafx.collections.*;
import javafx.event.EventHandler;
import javafx.scene.*;
import javafx.scene.control.*;
import javafx.scene.control.cell.*;
import javafx.stage.Stage;
import javafx.util.Callback;
public class SampleFX1 extends Application {
private TableView table = new TableView();
private final ObservableList<Person> data =
FXCollections.observableArrayList(
new Person("balu", "Smith"),
new Person("Isabella", "john"),
new Person("Ethan", "Williams"),
new Person("Emma", "Jones"),
new Person("Michael", "Brown")
);
public static void main(String[] args) {
launch(args);
}
@Override
public void start(Stage stage) {
Scene scene = new Scene(new Group());
TableColumn firstNameCol = createSimpleFirstNameColumn();
TableColumn lastNameCol = createLastNameColumn();
TableColumn fullNameCol = createFullNameColumn();
table.setItems(data);
table.getColumns().addAll(firstNameCol, lastNameCol, fullNameCol);
table.setEditable(true);
((Group) scene.getRoot()).getChildren().addAll(table);
stage.setScene(scene);
stage.show();
}
private TableColumn createSimpleFirstNameColumn() {
TableColumn<Person, String> firstNameCol = new TableColumn<>("First Name");
firstNameCol.setMinWidth(100);
firstNameCol.setCellValueFactory(new PropertyValueFactory<Person, String>("firstName"));
firstNameCol.setCellFactory(TextFieldTableCell.forTableColumn());
firstNameCol.setOnEditCommit(new EventHandler<TableColumn.CellEditEvent<Person, String>>() {
@Override
public void handle(TableColumn.CellEditEvent<Person, String> t) {
t.getRowValue().setFirstName(t.getNewValue());
}
});
return firstNameCol;
}
private TableColumn createLastNameColumn() {
Callback<TableColumn, TableCell> editableFactory = new Callback<TableColumn, TableCell>() {
@Override
public TableCell call(TableColumn p) {
return new EditingCell();
}
};
TableColumn lastNameCol = new TableColumn("Last Name");
lastNameCol.setMinWidth(100);
lastNameCol.setCellValueFactory(new PropertyValueFactory<Person, String>("lastName"));
lastNameCol.setCellFactory(editableFactory);
lastNameCol.setOnEditCommit(new EventHandler<TableColumn.CellEditEvent<Person, String>>() {
@Override
public void handle(TableColumn.CellEditEvent<Person, String> t) {
System.out.println("Commiting last name change. Previous: " + t.getOldValue() + " New: " + t.getNewValue());
t.getRowValue().setLastName(t.getNewValue());
}
});
return lastNameCol;
}
private TableColumn createFullNameColumn() {
TableColumn fullNameCol = new TableColumn("Full Name");
fullNameCol.setMinWidth(100);
fullNameCol.setCellValueFactory(new PropertyValueFactory<Person, String>("fullName"));
return fullNameCol;
}
}
EditingCell.java
(与问题无关)
更新以回答有关示例代码的其他用户问题
我能够运行createSimpleFirstNameColumn(),即使有很多来自eclipse的警告,例如:TableColumn是一个原始类型。应该参数化泛型类型TableColumn。
原始源代码是根据标准JavaFX TableView sample code改编的,当时这不是使用Generics的最佳示例。 Java中的泛型类型规范是可选的,但如果混合使用指定了泛型的API,但不在API使用中提供泛型类型信息,则编译器将发出如上所述的警告。一般来说,警告可以被忽略,或者如果你愿意,虽然如果明确指定类型信息,你可以获得更好的类型推断和编译时间类型检查。
而不仅仅是说:
TableColumn firstNameCol = new TableColumn("First Name");
可以通过明确指定类型信息来消除警告,如下所示:
TableColumn<Person, String> firstNameCol = new TableColumn<>("First Name");
我已更新上面的示例代码,在createSimpleFirstNameColumn()
函数中使用此表示法。
请注意,上面的代码使用Java 7 diamond notation,因此程序的最低语言编译级别必须至少设置为Java 7.
但是,在createLastNameColumn()中,返回new EditingCell()的行给出了一个错误,即EditingCell无法解析为某个类型。
我没有收到此错误。您可能没有在项目中包含原始问题中定义的EditingCell类。
答案 1 :(得分:0)
我无法发表评论,但回答了这个修订过的问题:
即使有很多来自eclipse的警告,我也可以运行createSimpleFirstNameColumn()
,例如:TableColumn
是原始类型。应该参考通用类型TableColumn
的参考。
确保您拥有正确的导入,即
import javafx.scene.control.TableColumn;
而不是来自Java Swing的任何内容。