Javafx动态加载ComboBox [英] Javafx Dynamically load ComboBox
本文介绍了Javafx动态加载ComboBox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
我试图在Dan Nicks的评论这个问题。
想法是在构建它之前设置组合数据。
fxml文件:
I am trying to make a custom builder proposed in Dan Nicks's comment to this question.
The idea is to set combo's data before constructing it.
The fxml file:
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.control.ComboBox?>
<ComboBox fx:id="combo1" items="${itemLoader.items}" prefWidth="150.0"
xmlns:fx="http://javafx.com/fxml/1">
</ComboBox>
提供数据的类:
public class ComboLoader {
public ObservableList<Item> items;
public ComboLoader() {
items = FXCollections.observableArrayList(createItems());
}
private List<Item> createItems() {
return IntStream.rangeClosed(0, 5)
.mapToObj(i -> "Item "+i)
.map(Item::new)
.collect(Collectors.toList());
}
public ObservableList<Item> getItems(){
return items;
}
public static class Item {
private final StringProperty name = new SimpleStringProperty();
public Item(String name) {
this.name.set(name);
}
public final StringProperty nameProperty() {
return name;
}
}
}
测试:
public class ComboTest extends Application {
@Override
public void start(Stage primaryStage) throws IOException {
primaryStage.setTitle("Populate combo from custom builder");
Group group = new Group();
GridPane grid = new GridPane();
grid.setPadding(new Insets(25, 25, 25, 25));
group.getChildren().add(grid);
FXMLLoader loader = new FXMLLoader();
ComboBox combo = loader.load(getClass().getResource("combo.fxml"));
loader.getNamespace().put("itemLoader", new ComboLoader());
grid.add(combo, 0, 0);
Scene scene = new Scene(group, 450, 175);
primaryStage.setScene(scene);
primaryStage.show();
}
public static void main(String[] args) {
launch(args);
}
}
没有产生错误,但没有填充组合。
缺少什么?
No errors produced, but combo is not populated.
What is missing ?
BTW:类似的解决方案正常工作:
BTW: a similar solution for works fine:
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.control.TableView?>
<?import javafx.scene.control.TableColumn?>
<?import javafx.scene.control.cell.PropertyValueFactory?>
<TableView items="${itemLoader.items}" xmlns:fx="http://javafx.com/fxml/1">
<columns>
<TableColumn text="Item">
<cellValueFactory><PropertyValueFactory property="name" /></cellValueFactory>
</TableColumn>
</columns>
</TableView>
推荐答案
修正错误加载并添加 toString
方法可以正常工作:
After fixing wrong loading and adding a toString
method it works fine :
public class ComboLoader {
private ObservableList<Item> obsItems;
public ComboLoader() {
obsItems = FXCollections.observableArrayList(createItems());
}
private List<Item> createItems() {
return IntStream.rangeClosed(0, 5)
.mapToObj(i -> "Item "+i)
.map(Item::new)
.collect(Collectors.toList());
}
//name of this methods corresponds to itemLoader.items in fxml.
//if xml name was itemLoader.a this method should have been
//getA(). A bit odd
public ObservableList<Item> getItems(){
return obsItems;
}
public static class Item {
private final StringProperty name = new SimpleStringProperty();
public Item(String name) {
this.name.set(name);
}
public final StringProperty nameProperty() {
return name;
}
@Override
public String toString() {
return name.getValue();
}
}
}
>
public class ComboTest extends Application {
@Override
public void start(Stage primaryStage) throws IOException {
primaryStage.setTitle("Populate combo from custom builder");
Group group = new Group();
GridPane grid = new GridPane();
grid.setPadding(new Insets(25, 25, 25, 25));
group.getChildren().add(grid);
FXMLLoader loader = new FXMLLoader(getClass().getResource("combo.fxml"));
loader.getNamespace().put("itemLoader", new ComboLoader());
ComboBox<String>combo = loader.load();
grid.add(combo, 0, 0);
Scene scene = new Scene(group, 450, 175);
primaryStage.setScene(scene);
primaryStage.show();
}
public static void main(String[] args) {
launch(args);
}
}
这篇关于Javafx动态加载ComboBox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!
查看全文