codestory

Die Anleitung zu JavaFX Spinner

  1. JavaFX Spinner
  2. Das Beispiel mit Spinner
  3. Spinner und Styles
  4. Spinner und Change Event
  5. Der Spinner ist editierbar

1. JavaFX Spinner

Spinner wie ComboBox oder List ermöglicht den Benutzer bei Wahl einer Wertmenge. Wie der ComboBox kann Spinner die Wert zu addieren ermöglichen. Nicht wie ComboBox hat Spinner keine Drop Down Liste, keine Anzeige der Wertslist. Bei einer Zeitpunkt zeigt er eine bestimmte Wert. Er wird für die ComboBox oder List ersatzt wenn die Wertmenge ist so groß
Die Struktur von Spinner

2. Das Beispiel mit Spinner

Beispiel unten stellt ein Spinner mit nummerischer Wert dar
SpinnerDemo.java
package org.o7planning.javafx.spinner;

import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.control.Spinner;
import javafx.scene.control.SpinnerValueFactory;
import javafx.scene.layout.FlowPane;
import javafx.stage.Stage;

public class SpinnerDemo extends Application {

    @Override
    public void start(Stage stage) {

        Label label = new Label("Select Level:");
        final Spinner<Integer> spinner = new Spinner<Integer>();

        final int initialValue = 3;

        // Value factory.
        SpinnerValueFactory<Integer> valueFactory = //
                new SpinnerValueFactory.IntegerSpinnerValueFactory(1, 5, initialValue);

        spinner.setValueFactory(valueFactory);

        FlowPane root = new FlowPane();
        root.setHgap(10);
        root.setVgap(10);
        root.setPadding(new Insets(10));

        root.getChildren().addAll(label, spinner);

        Scene scene = new Scene(root, 400, 200);

        stage.setTitle("JavaFX Spinner (o7planning.org)");
        stage.setScene(scene);
        stage.show();
    }

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

}
Beispiel 2
SpinnerDemo2.java
package org.o7planning.javafx.spinner;

import javafx.application.Application;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.control.Spinner;
import javafx.scene.control.SpinnerValueFactory;
import javafx.scene.layout.FlowPane;
import javafx.stage.Stage;

public class SpinnerDemo2 extends Application {

   @Override
   public void start(Stage stage) {

       Label label = new Label("Select Month:");

       ObservableList<String> months = FXCollections.observableArrayList(//
               "January", "February", "March", "April", //
               "May", "June", "July", "August", //
               "September", "October", "November", "December");

       final Spinner<String> spinner = new Spinner<String>();

       // Value factory.
       SpinnerValueFactory<String> valueFactory = //
               new SpinnerValueFactory.ListSpinnerValueFactory<String>(months);
     
       // Default value
       valueFactory.setValue("February");

       spinner.setValueFactory(valueFactory);

       FlowPane root = new FlowPane();
       root.setHgap(10);
       root.setVgap(10);
       root.setPadding(new Insets(10));

       root.getChildren().addAll(label, spinner);

       Scene scene = new Scene(root, 400, 200);

       stage.setTitle("JavaFX Spinner (o7planning.org)");
       stage.setScene(scene);
       stage.show();
   }

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

}

3. Spinner und Styles

JavaFX Spinner kann die Position und die Richtung für die Pfeife setzen. Beim Nicht Anpassung ist die Pfeife rechts und in vertikaler Richtung
SpinnerStyleDemo.java
package org.o7planning.javafx.spinner;

import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.control.Spinner;
import javafx.scene.layout.FlowPane;
import javafx.stage.Stage;

public class SpinnerStyleDemo extends Application {

    @Override
    public void start(Stage stage) {

        String[] styleClasses = new String[] { "", // Default.
                Spinner.STYLE_CLASS_ARROWS_ON_RIGHT_HORIZONTAL, //
                Spinner.STYLE_CLASS_ARROWS_ON_LEFT_VERTICAL, //
                Spinner.STYLE_CLASS_ARROWS_ON_LEFT_HORIZONTAL, //
                Spinner.STYLE_CLASS_SPLIT_ARROWS_VERTICAL, //
                Spinner.STYLE_CLASS_SPLIT_ARROWS_HORIZONTAL

        };

        FlowPane root = new FlowPane();
        root.setHgap(10);
        root.setVgap(10);
        root.setPadding(new Insets(10));

        for (String styleClass : styleClasses) {
            Spinner<Integer> spinner = new Spinner<Integer>(1, 20, 10);
            spinner.getStyleClass().add(styleClass);
            root.getChildren().add(spinner);
        }

        Scene scene = new Scene(root, 400, 200);

        stage.setTitle("JavaFX Spinner (o7planning.org)");
        stage.setScene(scene);
        stage.show();
    }

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

}

4. Spinner und Change Event

Normalerweise bezeichnet Spinner die nummerische Wert. Aber Sie können ein Objekt darstellen. Beispiel unten bestehen Spinner aus der Gegenstand Language umgehen der Ereignis wenn der Wert von Spinner ändert.
SpinnerChangeEventDemo.java
package org.o7planning.javafx.spinner;

import java.util.ArrayList;
import java.util.List;

import org.o7planning.javafx.model.Language;

import javafx.application.Application;
import javafx.beans.value.ChangeListener;
import javafx.beans.value.ObservableValue;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.control.Spinner;
import javafx.scene.control.SpinnerValueFactory;
import javafx.scene.layout.FlowPane;
import javafx.stage.Stage;

public class SpinnerChangeEventDemo extends Application {

    @Override
    public void start(Stage stage) {

        Language vietnamese = new Language("vi", "Vietnamese", "Xin Chao");
        Language english = new Language("en", "English", "Hello");
        Language russian = new Language("ru", "Russian", "привет");

        List<Language> languages = new ArrayList<Language>();
        languages.add(vietnamese);
        languages.add(english);
        languages.add(russian);

        //
        
        Label label = new Label("Select Language:");
        final Spinner<Language> spinner = new Spinner<Language>();

        Label labelMessage = new Label("?");

        // Value factory.
        SpinnerValueFactory<Language> valueFactory = //
                new SpinnerValueFactory<Language>() {

                    @Override
                    public void decrement(int steps) {
                        Language current = this.getValue();
                        int idx = languages.indexOf(current);
                        int newIdx = (languages.size() + idx - steps) % languages.size();
                        Language newLang = languages.get(newIdx);
                        this.setValue(newLang);
                    }

                    @Override
                    public void increment(int steps) {
                        Language current = this.getValue();
                        int idx = languages.indexOf(current);
                        int newIdx = (idx + steps) % languages.size();
                        Language newLang = languages.get(newIdx);
                        this.setValue(newLang);
                    }

                };

        // Default value for Spinner
        valueFactory.setValue(vietnamese);

        spinner.setValueFactory(valueFactory);

        // When spinner change value.
        spinner.valueProperty().addListener(new ChangeListener<Language>() {

            @Override
            public void changed(ObservableValue<? extends Language> observable,//
                    Language oldValue, Language newValue) {
                
                labelMessage.setText("Greeting: "+ newValue.getGreeting());

            }
        });

        FlowPane root = new FlowPane();
        root.setHgap(10);
        root.setVgap(10);
        root.setPadding(new Insets(10));

        root.getChildren().addAll(label, spinner, labelMessage);

        Scene scene = new Scene(root, 400, 200);

        stage.setTitle("JavaFX Spinner (o7planning.org)");
        stage.setScene(scene);
        stage.show();
    }

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

}
Language.java
package org.o7planning.javafx.model;

public class Language {

    private String code;
    private String name;
    private String greeting;

    public Language() {

    }

    public Language(String code, String name) {
        this.code = code;
        this.name = name;
    }

    public Language(String code, String name, String greeting) {
        this.code = code;
        this.name = name;
        this.greeting = greeting;
    }

    public String getCode() {
        return code;
    }

    public void setCode(String code) {
        this.code = code;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getGreeting() {
        return greeting;
    }

    public void setGreeting(String greeting) {
        this.greeting = greeting;
    }

    @Override
    public String toString() {
        return this.name;
    }

}

5. Der Spinner ist editierbar

Der Benutzer kann die zusätzliche Wert für Spinner hinzufügen. Beispiel unten gibt der Benutzer den Wert ein und Enter drücken, dann wird der zusätzliche Wert in die vorhandene Wertsmenge von Spinner
SpinnerEditDemo.java
package org.o7planning.javafx.spinner;

import javafx.application.Application;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.control.Spinner;
import javafx.scene.control.SpinnerValueFactory;
import javafx.scene.control.SpinnerValueFactory.ListSpinnerValueFactory;
import javafx.scene.layout.FlowPane;
import javafx.stage.Stage;
import javafx.util.StringConverter;

public class SpinnerEditDemo extends Application {

   @Override
   public void start(Stage stage) {

       Label label = new Label("Select Level:");
       final Spinner<Integer> spinner = new Spinner<Integer>();

       // Editable.
       spinner.setEditable(true);

       // Item List.
       ObservableList<Integer> items = FXCollections.observableArrayList(1, 2, 3);

       // Value Factory:
       SpinnerValueFactory<Integer> valueFactory = //
               new SpinnerValueFactory.ListSpinnerValueFactory<>(items);

       // The converter to convert between text and item object.
       MyConverter converter = new MyConverter();
       valueFactory.setConverter(converter);

       spinner.setValueFactory(valueFactory);

       spinner.getEditor().setOnAction(new EventHandler<ActionEvent>() {

           @Override
           public void handle(ActionEvent event) {
               String text = spinner.getEditor().getText();
               SpinnerValueFactory.ListSpinnerValueFactory<Integer>//
               valueFactory = (ListSpinnerValueFactory<Integer>) spinner.getValueFactory();

               StringConverter<Integer> converter = valueFactory.getConverter();
               Integer enterValue = converter.fromString(text);

               // If the list does not contains 'enterValue'.
               if (!valueFactory.getItems().contains(enterValue)) {
                   // Add new item to list
                   valueFactory.getItems().add(enterValue);
                   // Set to current
                   valueFactory.setValue(enterValue);
               } else {
                   // Set to current
                   valueFactory.setValue(enterValue);
               }

           }
       });

       //
       FlowPane root = new FlowPane();
       root.setHgap(10);
       root.setVgap(10);
       root.setPadding(new Insets(10));

       root.getChildren().addAll(label, spinner);

       Scene scene = new Scene(root, 400, 200);

       stage.setTitle("JavaFX Spinner (o7planning.org)");
       stage.setScene(scene);
       stage.show();
   }

   class MyConverter extends StringConverter<Integer> {

       @Override
       public String toString(Integer object) {
           return object + "";
       }

       @Override
       public Integer fromString(String string) {
           return Integer.parseInt(string);
       }

   }

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

}

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