FXML:绑定到控制器

Question

是否有可能像在xaml中一样在FXML中绑定到控制器到类varibale.我在做的是:

FXML

<ComboBox fx:id="searchField" 
                    HBox.hgrow="ALWAYS" editable="true" />
<GridPane hgap="5" vgap="5">
    <Label text="Nom" />
    <Label text="$selecteClient.name"
        GridPane.columnIndex="1" />

    <Label GridPane.rowIndex="1" text="tél" />
    <Label text="$electedClient.phoneNumber"
        GridPane.rowIndex="1" GridPane.columnIndex="1" />
<GridPane/>

的Controler:

private final List<Client> clients = FXCollections.observableArrayList(ImportingDataService.importClients());
@FXML
private Client selectedClient;

@FXML
private ComboBox<Client> searchField;

@Override
public void initialize(URL location, ResourceBundle resources) {
    // Set appDtat client id so it refreshes when client is changed
    this.appState.clientViewClientIDProperty().addListener((obs, oldValue, newValue) -> {
        selectedClient = ImportingDataService.importClient(newValue.longValue());

    });

    // Set up combo box
    setUpComboBox();

}
private void setUpComboBox() {
    searchField.getItems().addAll(clients);
    UtilService.autoCompleteComboBoxPlus(searchField, (typedText, client) -> client.getName().contains(typedText));

    // Handle selecting clients
    searchField.getSelectionModel().selectedItemProperty().addListener((obs, oldValue, newValue) -> {
        selectedClient = ImportingDataService.importClient(newValue.getId());
    });
}

我的Client班级是一个有String田野name和班级的班级phoneNumber.并且ImportingDataService.importClient用于从数据库导入数据,它们工作正常(我放置了断点并检查了).问题是,Label当我改变选择时,我不知道为什么客户端不会更新ComboBox,而selectedClient确实会改变.我究竟做错了什么？

Answer 1

这有多种原因:

1. 一个简单的字段是不可观察的.
2. 您不包含controller在表达式绑定中.
3. 这里$selecteClient.name和这里有一个错字$electedClient.phoneNumber.
4. 整个表达式需要包含在内部{}才能被绑定,而不仅仅是设置.

你可以像这样解决它:

调节器

private final ObjectProperty<Client> selectedClient = new SimpleObjectProperty<>(initialClient);

public final Client getSelectedClient() {
    return this.selectedClient.get();
}

public final void setSelectedClient(Client value) {
    this.selectedClient.set(value);
}

public final ObjectProperty<Client> selectedClientProperty() {
    return this.selectedClient;
}

...

// selectedClient = ImportingDataService.importClient(newValue.getId());
setSelectedClient(ImportingDataService.importClient(newValue.getId()));

FXML

<ComboBox fx:id="searchField" 
                    HBox.hgrow="ALWAYS" editable="true" />
<GridPane hgap="5" vgap="5">
    <Label text="Nom" />
    <Label text="${controller.selectedClient.name}"
        GridPane.columnIndex="1" />

    <Label GridPane.rowIndex="1" text="tél" />
    <Label text="${controller.selectedClient.phoneNumber}"
        GridPane.rowIndex="1" GridPane.columnIndex="1" />
<GridPane/>

客户

public String getName() {
    return name;
}

public String getPhoneNumber() {
    return phoneNumber;
}

(或类似的东西)