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JavaFX - 无法将项目添加到表格 View

转载 作者:行者123 更新时间:2023-12-02 01:30:12 25 4
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我对 JavaFX 还很陌生。我长期以来一直在绝望地尝试让它发挥作用,但不知道为什么它不起作用。这些项目没有显示在桌面 View 上。我使用场景生成器创建了 UI。我看过很多类似的问题,但似乎没有任何帮助。

简化为最少的代码:

主要:

package sample;

import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;

public class Main extends Application {

@Override
public void start(Stage primaryStage) throws Exception{
Parent root = FXMLLoader.load(getClass().getResource("sample.fxml"));
primaryStage.setTitle("Hello World");
primaryStage.setScene(new Scene(root, 300, 275));
primaryStage.show();
}


public static void main(String[] args) {
launch(args);
}
}

Controller :

package sample;

import javafx.beans.property.SimpleStringProperty;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
import javafx.scene.control.cell.PropertyValueFactory;

import java.net.URL;
import java.util.ResourceBundle;


public class Controller implements Initializable {
ObservableList<Person> people = FXCollections.observableArrayList();
@FXML private TableView<Person> table;
@FXML private TableColumn<Person, SimpleStringProperty> c1;
@FXML private TableColumn<Person, SimpleStringProperty> c2;

@Override
public void initialize(URL location, ResourceBundle resources) {
c1.setCellValueFactory(new PropertyValueFactory<>("age"));
c2.setCellValueFactory(new PropertyValueFactory<>("name"));

people.add(new Person("2", "Sam"));
people.add(new Person("1", "Met"));
table.setItems(people);
}


}

人员类别:

package sample;

import javafx.beans.property.SimpleStringProperty;

public class Person {
private SimpleStringProperty age;
private SimpleStringProperty name;


public Person(String age, String name) {
this.age = new SimpleStringProperty(age);
this.name = new SimpleStringProperty(name);
}
}

FXML:

<?xml version="1.0" encoding="UTF-8"?>

<?import javafx.scene.control.TableColumn?>
<?import javafx.scene.control.TableView?>
<?import javafx.scene.layout.AnchorPane?>


<?import javafx.scene.control.cell.PropertyValueFactory?>
<AnchorPane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity"
minWidth="-Infinity" prefHeight="400.0" prefWidth="600.0" xmlns="http://javafx.com/javafx/11.0.1"
xmlns:fx="http://javafx.com/fxml/1">
<TableView fx:id="table" layoutX="51.0" layoutY="31.0" prefHeight="338.0" prefWidth="498.0">
<columns>
<TableColumn fx:id="c1" prefWidth="75.0" text="C1">
<cellValueFactory>
<PropertyValueFactory property="c1" />
</cellValueFactory>
</TableColumn>
<TableColumn fx:id="c2" prefWidth="75.0" text="C1">
<cellValueFactory>
<PropertyValueFactory property="c2" />
</cellValueFactory>
</TableColumn>
</columns>
</TableView>
</AnchorPane>

谢谢。

最佳答案

要使其发挥作用,您需要进行一些更改。阅读代码中的注释:

Person 类必须具有公共(public) getter:

import javafx.beans.property.SimpleStringProperty;
import javafx.beans.property.StringProperty;

public class Person {

private final SimpleStringProperty age;
private final SimpleStringProperty name;

public Person(String age, String name) {
this.age = new SimpleStringProperty(age);
this.name = new SimpleStringProperty(name);
}

//add getters to properties with the appropriate naming convention
public final StringProperty ageProperty() {
return age;
}

public final StringProperty nameProperty() {
return name;
}
}

在 fxml 中,您必须指定 Controller 。另请注意 TableView 中的更改:

<?xml version="1.0" encoding="UTF-8"?>

<?import javafx.scene.control.TableColumn?>
<?import javafx.scene.control.TableView?>
<?import javafx.scene.layout.AnchorPane?>

<?import javafx.scene.control.cell.PropertyValueFactory?>
<AnchorPane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity"
minWidth="-Infinity" prefHeight="400.0" prefWidth="600.0" xmlns="http://javafx.com/javafx/11.0.1"
xmlns:fx="http://javafx.com/fxml/1"
fx:controller="xml_tabel_1.Controller"> <!-- need to specify the controller of the fxml -->
<TableView items="${controller.people}"> <!-- need to specify the name of the observable list -->
<columns>
<TableColumn prefWidth="75.0" text="age">

<cellValueFactory>
<PropertyValueFactory property="age" />
</cellValueFactory>
</TableColumn>
<TableColumn prefWidth="75.0" text="name">
<cellValueFactory>
<PropertyValueFactory property="name" />
</cellValueFactory>
</TableColumn>
</columns>
</TableView>
</AnchorPane>

在 Controller 中您需要做的就是填充可观察列表并为其提供一个公共(public) getter :

import java.net.URL;
import java.util.ResourceBundle;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.fxml.Initializable;

public class Controller implements Initializable {

private final ObservableList<Person> people = FXCollections.observableArrayList();
//all this was already set in fxml
//@FXML private TableView<Person> table;
//@FXML private TableColumn<Person, SimpleStringProperty> c1;
//@FXML private TableColumn<Person, SimpleStringProperty> c2;

@Override
public void initialize(URL location, ResourceBundle resources) {
people.add(new Person("2", "Sam"));
people.add(new Person("1", "Met"));
}

//add a getter to people
public ObservableList<Person> getPeople() {
return people ;
}
}

关于JavaFX - 无法将项目添加到表格 View ,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/56208579/

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