在 JavaFX 中管理 ComboBox 项
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Managing a ComboBox items in JavaFX
提问by spacitron
I'm populating a ComboBox using Text objects. Using Text objects rather than Strings allows me to add an id value that I can use in my program and later exploit when I decide to internationalize the UI. Anyway, here is what I'm doing: Main class:
我正在使用 Text 对象填充 ComboBox。使用文本对象而不是字符串允许我添加一个 id 值，我可以在我的程序中使用它，并在我决定国际化 UI 时利用它。无论如何，这就是我在做什么： 主课：
public class MainApp extends Application {
private Stage primaryStage;
@Override
public void start(Stage primaryStage) {
this.primaryStage = primaryStage;
try {
AnchorPane paneMain = (AnchorPane) FXMLLoader.load(getClass().getResource("Test.fxml"));
Scene scene = new Scene(paneMain);
primaryStage.setScene(scene);
primaryStage.show();
} catch (IOException e) {
e.printStackTrace();
}
}
public static void main(String[] args) {
launch(args);
}
}
}
Controller:
控制器：
public class Test implements Initializable{
@FXML
private AnchorPane anchorPane;
@FXML
private ComboBox<Text> comboTime;
private Text days;
private Text hours;
private Text minutes;
private int timeMultiplier;
public Test(){
days = new Text("Days");
days.setId("86400000");
hours = new Text("Hours");
hours.setId("3600000");
minutes = new Text("Minutes");
minutes.setId("3600000");
timeMultiplier = 0;
}
@Override
public void initialize(URL location, ResourceBundle resources) {
comboTime.getItems().removeAll(comboTime.getItems());
comboTime.getItems().addAll(days, hours, minutes);
comboTime.getSelectionModel().select(hours);
}
@FXML
private void setTimeMultiplier(){
Text text = comboTime.getSelectionModel().getSelectedItem();
timeMultiplier = Integer.valueOf(text.getId());
}
}
Test.fxml:
测试.fxml：
<?xml version="1.0" encoding="UTF-8"?>
<?import java.lang.*?>
<?import java.util.*?>
<?import javafx.collections.*?>
<?import javafx.geometry.*?>
<?import javafx.scene.control.*?>
<?import javafx.scene.layout.*?>
<?import javafx.scene.paint.*?>
<?import javafx.scene.text.*?>
<AnchorPane id="AnchorPane" fx:id="anchorPane" maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="100.99990000000253" prefWidth="94.99990000000253" xmlns:fx="http://javafx.com/fxml/1" xmlns="http://javafx.com/javafx/2.2" fx:controller="com.spacitron.backupp.ui.controllers.Test">
<children>
<HBox id="HBox" alignment="CENTER" layoutX="41.0" layoutY="224.0" prefWidth="216.0" spacing="5.0" />
<ComboBox id="comboInterval" fx:id="comboTime" editable="false" layoutX="14.0" layoutY="22.0" onAction="#setTimeMultiplier">
<items>
<FXCollections fx:factory="observableArrayList">
<String fx:value="Item 1" />
<String fx:value="Item 2" />
<String fx:value="Item 3" />
</FXCollections>
</items>
</ComboBox>
</children>
</AnchorPane>
Now, this works just fine. The problem however is that when I select an item the text on that item goes blank like so:
现在，这工作得很好。然而，问题是当我选择一个项目时，该项目上的文本变为空白，如下所示：
And if I select another one, that disappears too:
如果我选择另一个，它也会消失：
I can still select the items, but they're just not there to be seen. Is this a bug and if so is there a way around it?
我仍然可以选择这些项目，但它们只是不可见。这是一个错误，如果是，有没有办法解决它？
EDITED to provide MCVE
编辑以提供 MCVE
回答by Jurgen
You shouldn't be putting the Text nodes into the ComboBox ... please see this question that will help you: setButtonCell for ComboBox
您不应该将 Text 节点放入 ComboBox ......请参阅这个对您有帮助的问题：setButtonCell for ComboBox
