对象内容更改时组合框刷新值和列表视图 [英] Combobox refresh value and listview when object content change

问题描述

当用于在组合中显示文本的对象的内容发生变化时，我想更新我的组合框.

I would like to update my combobox when the content of the object used to display text in combo changes.

这是一个示例:

package com.javafx.example.combobox;

import javafx.application.Application;
import javafx.beans.property.SimpleStringProperty;
import javafx.beans.property.StringProperty;
import javafx.collections.FXCollections;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.ComboBox;
import javafx.scene.control.TextField;
import javafx.scene.layout.HBox;
import javafx.scene.layout.Priority;
import javafx.stage.Stage;
import javafx.util.StringConverter;

public class ComboboxSample extends Application {


    class Sequence {
        public StringProperty name = new SimpleStringProperty();

        public Sequence(String name) {
            super();
            this.name.set(name);
        }

        @Override
        public String toString() {
            return "null";
        }
    }

    @Override
    public void start(Stage stage) throws Exception {
        stage.setTitle("ComboBoxSample");

        ComboBox<Sequence> combo = new ComboBox<>();
        combo.setItems(FXCollections.observableArrayList(
                new Sequence("Toto"),
                new Sequence("Titi")));
        combo.getSelectionModel().selectFirst();
        combo.setConverter(new StringConverter<ComboboxSample.Sequence>() {
            @Override
            public String toString(Sequence sequence) {
                return sequence.name.get();
            }

            @Override
            public Sequence fromString(String string) {
                System.out.println("call fromString");
                return null;
            }
        });

        TextField text = new TextField();
        Button renameButton = new Button("Rename");

        renameButton.setOnAction(evt -> combo.getValue().name.set(text.getText()));

        HBox root = new HBox(combo, text, renameButton);
        HBox.setHgrow(text, Priority.ALWAYS);

        stage.setScene(new Scene(root));
        stage.show();

    }

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

组合框包含具有属性名称的对象.如果我重命名此属性，则显示不会更改，或者有时会更改但并非始终更改.这是组合框在对象更改时更新的标准行为，而不是在其内容更改时更新.

The combobox contains objects with a property name. If i rename this property, the display do not change or sometimes it changes but not all the time. It is the standard behavior as the combobox update when the object changes, and not when its content changes.

如何强制组合框在更改时刷新其值和列表视图?

How can i do to force the combobox to refresh its value and the listview on change?

谢谢

编辑 1:

在 observaleList 中使用回调似乎是一种解决方案.包 com.javafx.example.combobox;

Using a callback in an observaleList seems to be a solution. package com.javafx.example.combobox;

import javafx.application.Application;
import javafx.beans.Observable;
import javafx.beans.property.SimpleStringProperty;
import javafx.beans.property.StringProperty;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.ComboBox;
import javafx.scene.control.TextField;
import javafx.scene.layout.HBox;
import javafx.scene.layout.Priority;
import javafx.stage.Stage;
import javafx.util.Callback;
import javafx.util.StringConverter;

public class ComboboxSample extends Application {

    ObservableList<Sequence> sequences;


    class Sequence {
        public StringProperty name = new SimpleStringProperty();

        public Sequence(String name) {
            super();
            this.name.set(name);
        }

        @Override
        public String toString() {
            return "null";
        }
    }

    @Override
    public void start(Stage stage) throws Exception {
        stage.setTitle("ComboBoxSample");

        Callback<Sequence, Observable[]> extractor = new Callback<Sequence, Observable[]>() {
            @Override
            public Observable[] call(Sequence s) {
                return new Observable[] {s.name};
            }
        };
        sequences = FXCollections.observableArrayList(extractor);
        sequences.addAll(
                new Sequence("Toto"),
                new Sequence("Titi"));

        ComboBox<Sequence> combo = new ComboBox<>();
        combo.setItems(sequences);
        combo.getSelectionModel().selectFirst();
        combo.setConverter(new StringConverter<ComboboxSample.Sequence>() {
            @Override
            public String toString(Sequence sequence) {
                return sequence.name.get();
            }

            @Override
            public Sequence fromString(String string) {
                System.out.println("call fromString");
                return null;
            }
        });
        combo.valueProperty().addListener((obs, oldValue, newValue) -> System.out.println("Change from " + oldValue.name.get() + " to " + newValue.name.get())); 

        TextField text = new TextField();
        Button renameButton = new Button("Rename");

        renameButton.setOnAction(evt -> {
            combo.getValue().name.set(text.getText());
        });

        HBox root = new HBox(combo, text, renameButton);
        HBox.setHgrow(text, Priority.ALWAYS);

        stage.setScene(new Scene(root));
        stage.show();

    }

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

推荐答案

每次将新值添加到对象列表时，再次设置组合框值.为我工作.我做了一个小例子来说明这一点.希望对你有帮助

Everytime a new value is added to the object list, set the combobox value again. Works for me. I did a small example to show this. Hope it is helpful

import javafx.application.Application;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.ComboBox;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;


public class ComboTest extends Application {
    int i =0;
    ObservableList<String> list = FXCollections.observableArrayList("A","B");
    ComboBox<String> combo = new ComboBox();
    @Override
    public void start(Stage primaryStage) {
        Button btn = new Button();
        combo.setPromptText("Testing combobox");
        combo.setPrefWidth(300);
        btn.setText("Add items to list");
        btn.setOnAction(new EventHandler<ActionEvent>() {

            @Override
            public void handle(ActionEvent event) {
                list.add(String.valueOf(i));
                System.out.println("size of list " + list.size() );
                i++;
               combo.setItems(list);
            }
        });
        combo.setItems(list);
        VBox root = new VBox();
        root.getChildren().addAll(btn,combo);
        root.setSpacing(20);
        root.setAlignment(Pos.CENTER);
        Scene scene = new Scene(root);

        primaryStage.setTitle("Hello World!");
        primaryStage.setScene(scene);
        primaryStage.show();
    }

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        launch(args);
    }

}

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