Java 使带有复选框的ListView与字符串列表保持同步

我想创建一个简单的ListView，并将其所选项目与列表中包含的字符串同步。我发现我可以使用setCellFactory（）方法，在选择/取消选择项目时更新字符串列表，但我不知道如何做相反的事情，在字符串列表更改时更新ListView项目选择

到目前为止，我已经：

ListView<String> selectedAttributes = new ListView<>();
String[] toppings = {"Cheese", "Pepperoni", "Black Olives"};
        listViewAttributes.getItems().addAll(toppings);
        listViewAttributes.setCellFactory(CheckBoxListCell.forListView(new Callback<String, ObservableValue<Boolean>>() {
            @Override
            public ObservableValue<Boolean> call(String item) {
                BooleanProperty observable = new SimpleBooleanProperty();
                observable.addListener((obs, wasSelected, isNowSelected) -> {
                    if (isNowSelected) {
                        selectedAttributes.add(item);
                    } else {
                        selectedAttributes.remove(item);
                    }
                    System.out.println(selectedAttributes.size());

                });
                return observable;
            }
        }));

ListView SelectedAttribute=new ListView（）；
String[]浇头={“奶酪”、“辣香肠”、“黑橄榄”}；
listViewAttributes.getItems（）.addAll（浇头）；
setCellFactory（CheckBoxListCell.forListView（新回调）（）{
@凌驾
公共observeValue调用（字符串项）{
BooleanProperty observable=新的SimpleBoleanProperty（）；
observable.addListener（（obs、wasSelected、isNowSelected）->{
如果（现在已选定）{
选择属性。添加（项）；
}否则{
所选属性。删除（项）；
}
System.out.println（selectedAttributes.size（））；
});
可观测收益；
}
}));

这使得列表

selectedAttributes

元素在选中/取消选中ListView项时更新，现在我想在列表内容更改时更新ListView项选择

---

我该怎么做

假设

selectedAttributes

是一个

observedset

，（或者是一个

observedsist

，在该列表中，您仔细检查后，不会多次添加同一项）添加

那么剩下的代码就容易多了：

ListView<Topping> listView = new ListView<>();
List<Topping> toppings = Arrays.asList(
    new Topping("Cheese"), 
    new Topping("Pepperoni") , 
    new Topping("Black Olives"));
listView.getItems().addAll(toppings);

listView.setCellFactory(CheckBoxListCell.forListView(Topping::selectedProperty));

以下是采用这种方法的SSCCE：

import javafx.application.Application;
import javafx.beans.property.BooleanProperty;
import javafx.beans.property.SimpleBooleanProperty;
import javafx.beans.value.ObservableValue;
import javafx.collections.FXCollections;
import javafx.collections.ObservableSet;
import javafx.collections.SetChangeListener;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.ListView;
import javafx.scene.control.cell.CheckBoxListCell;
import javafx.scene.layout.BorderPane;
import javafx.stage.Stage;
import javafx.util.Callback;

public class ListViewWithCheckBoxes extends Application {

    @Override
    public void start(Stage primaryStage) {
        ListView<String> toppingsList = new ListView<>();
        String[] toppings = {"Cheese", "Tomato Sauce", "Pepperoni", "Black Olives"};
        toppingsList.getItems().addAll(toppings);

        ObservableSet<String> selectedToppings = FXCollections.observableSet();

        toppingsList.setCellFactory(CheckBoxListCell.forListView(new Callback<String, ObservableValue<Boolean>>() {
            @Override
            public ObservableValue<Boolean> call(String item) {
                BooleanProperty observable = new SimpleBooleanProperty();
                observable.addListener((obs, wasSelected, isNowSelected) -> {
                    if (isNowSelected) {
                        selectedToppings.add(item);
                    } else {
                        selectedToppings.remove(item);
                    }
                    System.out.println(selectedToppings.size());

                });

                observable.set(selectedToppings.contains(item));
                selectedToppings.addListener((SetChangeListener.Change<? extends String> c) -> 
                    observable.set(selectedToppings.contains(item)));

                return observable;
            }
        }));


        // example of a button that changes what's selected in the list
        // This selects "Cheese" and "Tomato Sauce" and deselects everything else
        Button justCheese = new Button("Just a cheese pizza");
        justCheese.setOnAction(e -> {
            selectedToppings.clear();
            selectedToppings.add("Cheese");
            selectedToppings.add("Tomato Sauce");
        });

        BorderPane root = new BorderPane(toppingsList);
        root.setTop(justCheese);
        BorderPane.setMargin(justCheese, new Insets(5));

        Scene scene = new Scene(root);
        primaryStage.setScene(scene);
        primaryStage.show();
    }

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

import java.util.Arrays;
import java.util.List;

import javafx.application.Application;
import javafx.beans.property.BooleanProperty;
import javafx.beans.property.SimpleBooleanProperty;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.ListView;
import javafx.scene.control.cell.CheckBoxListCell;
import javafx.scene.layout.BorderPane;
import javafx.stage.Stage;

public class ListViewWithCheckBoxes extends Application {

    @Override
    public void start(Stage primaryStage) {
        ListView<Topping> toppingsList = new ListView<>();
        Topping cheese = new Topping("Cheese");
        Topping tomSauce = new Topping("Tomato Sauce");
        Topping pepperoni = new Topping("Pepperoni");
        Topping blackOlives = new Topping("Black Olives");

        toppingsList.getItems().addAll(cheese, tomSauce, pepperoni, blackOlives);


        toppingsList.setCellFactory(CheckBoxListCell.forListView(Topping::selectedProperty));

        // example of a button that changes what's selected in the list
        // This selects "Cheese" and "Tomato Sauce" and deselects everything else

        Button justCheese = new Button("Just a cheese pizza");
        List<Topping> cheesePizzaToppings = Arrays.asList(cheese, tomSauce);

        justCheese.setOnAction(e -> toppingsList.getItems().forEach(
                topping -> topping.setSelected(cheesePizzaToppings.contains(topping))));

        BorderPane root = new BorderPane(toppingsList);
        root.setTop(justCheese);
        BorderPane.setMargin(justCheese, new Insets(5));

        Scene scene = new Scene(root);
        primaryStage.setScene(scene);
        primaryStage.show();
    }

    public static class Topping {

        private final String name ;

        private final BooleanProperty selected = new SimpleBooleanProperty();

        public Topping(String name) {
            this.name = name ;
        }

        public BooleanProperty selectedProperty() {
            return selected ;
        }

        public final boolean isSelected() {
            return selectedProperty().get();
        }

        public final void setSelected(boolean selected) {
            selectedProperty().set(selected);
        }

        public String getName() {
            return name ;
        }

        @Override
        public String toString() {
            return getName();
        }
    }


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

导入java.util.array；
导入java.util.List；
导入javafx.application.application；
导入javafx.beans.property.BooleanProperty；
导入javafx.beans.property.SimpleBoleAnProperty；
导入javafx.geometry.Insets；
导入javafx.scene.scene；
导入javafx.scene.control.Button；
导入javafx.scene.control.ListView；
导入javafx.scene.control.cell.CheckBoxListCell；
导入javafx.scene.layout.BorderPane；
导入javafx.stage.stage；
带有复选框的公共类ListView扩展了应用程序{
@凌驾
公共无效开始（阶段primaryStage）{
ListView ToppingList=新建ListView（）；
顶部奶酪=新的顶部（“奶酪”）；
浇头番茄酱=新浇头（“番茄酱”）；
浇头辣香肠=新浇头（“辣香肠”）；
浇头黑橄榄=新浇头（“黑橄榄”）；
getItems（）.addAll（奶酪、番茄酱、意大利辣香肠、黑橄榄）；
setCellFactory（CheckBoxListCell.forListView（Topping:：selectedProperty））；
//更改列表中所选内容的按钮示例
//这将选择“奶酪”和“番茄酱”，并取消选择其他所有内容
Button justCheese=新按钮（“只是一个奶酪比萨饼”）；
List cheesepizzaatoppings=Arrays.asList（cheese，tomsause）；
justCheese.setOnAction（e->ToppingList.getItems（）.forEach(
topping->topping.setSelected（cheesePizzaToppings.contains（topping））；
BorderPane根=新的BorderPane（TopingList）；
根.立顶（justCheese）；
边框窗格。设置边框（justCheese，新插图（5））；
场景=新场景（根）；
初级阶段。场景（场景）；
primaryStage.show（）；
}
公共静态类顶级{
私有最终字符串名；
选定的私有最终布尔属性=新SimpleBoleAnProperty（）；
公共顶部（字符串名称）{
this.name=名称；
}
公共布尔属性selectedProperty（）{
返回选中的；
}
公共最终选举（）{
返回selectedProperty（）.get（）；
}
公共最终无效设置已选定（布尔值已选定）{
selectedProperty（）.set（已选择）；
}
公共字符串getName（）{
返回名称；
}
@凌驾
公共字符串toString（）{
返回getName（）；
}
}
公共静态void main（字符串[]args）{
发射（args）；
}
}

假设

selectedAttributes

是一个

observateSet

，（或者是一个

observateSist

，在这里您仔细检查并没有多次添加同一项）添加

那么剩下的代码就容易多了：

ListView<Topping> listView = new ListView<>();
List<Topping> toppings = Arrays.asList(
    new Topping("Cheese"), 
    new Topping("Pepperoni") , 
    new Topping("Black Olives"));
listView.getItems().addAll(toppings);

listView.setCellFactory(CheckBoxListCell.forListView(Topping::selectedProperty));

以下是采用这种方法的SSCCE：

import javafx.application.Application;
import javafx.beans.property.BooleanProperty;
import javafx.beans.property.SimpleBooleanProperty;
import javafx.beans.value.ObservableValue;
import javafx.collections.FXCollections;
import javafx.collections.ObservableSet;
import javafx.collections.SetChangeListener;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.ListView;
import javafx.scene.control.cell.CheckBoxListCell;
import javafx.scene.layout.BorderPane;
import javafx.stage.Stage;
import javafx.util.Callback;

public class ListViewWithCheckBoxes extends Application {

    @Override
    public void start(Stage primaryStage) {
        ListView<String> toppingsList = new ListView<>();
        String[] toppings = {"Cheese", "Tomato Sauce", "Pepperoni", "Black Olives"};
        toppingsList.getItems().addAll(toppings);

        ObservableSet<String> selectedToppings = FXCollections.observableSet();

        toppingsList.setCellFactory(CheckBoxListCell.forListView(new Callback<String, ObservableValue<Boolean>>() {
            @Override
            public ObservableValue<Boolean> call(String item) {
                BooleanProperty observable = new SimpleBooleanProperty();
                observable.addListener((obs, wasSelected, isNowSelected) -> {
                    if (isNowSelected) {
                        selectedToppings.add(item);
                    } else {
                        selectedToppings.remove(item);
                    }
                    System.out.println(selectedToppings.size());

                });

                observable.set(selectedToppings.contains(item));
                selectedToppings.addListener((SetChangeListener.Change<? extends String> c) -> 
                    observable.set(selectedToppings.contains(item)));

                return observable;
            }
        }));


        // example of a button that changes what's selected in the list
        // This selects "Cheese" and "Tomato Sauce" and deselects everything else
        Button justCheese = new Button("Just a cheese pizza");
        justCheese.setOnAction(e -> {
            selectedToppings.clear();
            selectedToppings.add("Cheese");
            selectedToppings.add("Tomato Sauce");
        });

        BorderPane root = new BorderPane(toppingsList);
        root.setTop(justCheese);
        BorderPane.setMargin(justCheese, new Insets(5));

        Scene scene = new Scene(root);
        primaryStage.setScene(scene);
        primaryStage.show();
    }

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

import java.util.Arrays;
import java.util.List;

import javafx.application.Application;
import javafx.beans.property.BooleanProperty;
import javafx.beans.property.SimpleBooleanProperty;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.ListView;
import javafx.scene.control.cell.CheckBoxListCell;
import javafx.scene.layout.BorderPane;
import javafx.stage.Stage;

public class ListViewWithCheckBoxes extends Application {

    @Override
    public void start(Stage primaryStage) {
        ListView<Topping> toppingsList = new ListView<>();
        Topping cheese = new Topping("Cheese");
        Topping tomSauce = new Topping("Tomato Sauce");
        Topping pepperoni = new Topping("Pepperoni");
        Topping blackOlives = new Topping("Black Olives");

        toppingsList.getItems().addAll(cheese, tomSauce, pepperoni, blackOlives);


        toppingsList.setCellFactory(CheckBoxListCell.forListView(Topping::selectedProperty));

        // example of a button that changes what's selected in the list
        // This selects "Cheese" and "Tomato Sauce" and deselects everything else

        Button justCheese = new Button("Just a cheese pizza");
        List<Topping> cheesePizzaToppings = Arrays.asList(cheese, tomSauce);

        justCheese.setOnAction(e -> toppingsList.getItems().forEach(
                topping -> topping.setSelected(cheesePizzaToppings.contains(topping))));

        BorderPane root = new BorderPane(toppingsList);
        root.setTop(justCheese);
        BorderPane.setMargin(justCheese, new Insets(5));

        Scene scene = new Scene(root);
        primaryStage.setScene(scene);
        primaryStage.show();
    }

    public static class Topping {

        private final String name ;

        private final BooleanProperty selected = new SimpleBooleanProperty();

        public Topping(String name) {
            this.name = name ;
        }

        public BooleanProperty selectedProperty() {
            return selected ;
        }

        public final boolean isSelected() {
            return selectedProperty().get();
        }

        public final void setSelected(boolean selected) {
            selectedProperty().set(selected);
        }

        public String getName() {
            return name ;
        }

        @Override
        public String toString() {
            return getName();
        }
    }


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

导入java.util.array；
导入java.util.List；
导入javafx.application.application；
导入javafx.beans.property.BooleanProperty；
导入javafx.beans.property.SimpleBoleAnProperty；
导入javafx.geometry.Insets；
导入javafx.scene.scene；
导入javafx.scene.control.Button；
导入javafx.scene.control.ListView；
导入javafx.scene.control.cell.CheckBoxListCell；
导入javafx.scene.layout.BorderPane；
导入javafx.stage.stage；
带有复选框的公共类ListView扩展了应用程序{
@凌驾
公共无效开始（阶段primaryStage）{
ListView ToppingList=新建ListView（）；
顶部奶酪=新的顶部（“奶酪”）；
浇头番茄酱=新浇头（“番茄酱”）；
浇头辣香肠=新浇头（“辣香肠”）；
浇头黑橄榄=新浇头（“黑橄榄”）；
getItems（）.addAll（奶酪、番茄酱、意大利辣香肠、黑橄榄）；
setCellFactory（CheckBoxListCell.forListView（Topping:：selectedProperty））；
//更改列表中所选内容的按钮示例
//这将选择“奶酪”和“番茄酱”，并取消选择其他所有内容
Button justCheese=新按钮（“只是一个奶酪比萨饼”）；
List cheesepizzaatoppings=Arrays.asList（cheese，tomsause）；
justCheese.setOnAction（e->ToppingList.getItems（）.forEach(
topping->topping.setSelected（cheesePizzaToppings.contains（topping））；
ListView<String> listViewAttributes = new ListView<>();

        List<String> selectedAttributes = new ArrayList<>();
        selectedAttributes.add("Pepperoni");

        String[] toppings = { "Cheese", "Pepperoni", "Black Olives" };
        listViewAttributes.getItems().addAll(toppings);
        listViewAttributes
                .setCellFactory(CheckBoxListCell.forListView(new Callback<String, ObservableValue<Boolean>>() {
                    @Override
                    public ObservableValue<Boolean> call(String item) {
                        BooleanProperty observable = new SimpleBooleanProperty();
                        for (int i = 0; i < selectedAttributes.size(); i++) {
                            if (item.equals(selectedAttributes.get(i))) {
                                observable.set(true);
                            }
                        }
                        observable.addListener((obs, wasSelected, isNowSelected) -> {
                            if (isNowSelected) {
                                selectedAttributes.add(item);
                            } else {
                                selectedAttributes.remove(item);
                            }
                            System.out.println(selectedAttributes.size());

                        });
                        return observable;
                    }
                }));