JavaFX更改進度指示器下的文本

Question

我想更改進度指示器下的文本。 默認情況下，當ProgressIndicator完成其進度后，該文本為“完成”，我希望能夠使用任何用戶定義的文本或取決於區域設置的文本來編輯此文本。

當我運行程序時，輸出顯示文本已更改，但在GUI上未更改。 請看以下圖片：

MCVE

import javafx.application.Application;
import javafx.beans.value.ChangeListener;
import javafx.beans.value.ObservableValue;
import javafx.concurrent.Task;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.geometry.Pos;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.ProgressIndicator;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.HBox;
import javafx.scene.paint.Color;
import javafx.scene.text.Text;
import javafx.stage.Stage;

public class Main extends Application {
    Task copyWorker;
    public static void main(String[] args) {
        Application.launch(args);
    }
    @Override
    public void start(Stage primaryStage) {
        primaryStage.setTitle("Background Processes");
        Group root = new Group();
        Scene scene = new Scene(root, 330, 120, Color.WHITE);

        BorderPane mainPane = new BorderPane();
        root.getChildren().add(mainPane);

        final Label label = new Label("Files Transfer:");
        final ProgressIndicator progressIndicator = new ProgressIndicator(0);
        progressIndicator.progressProperty().addListener(new ChangeListener<Number>() {  
        @Override  
        public void changed(ObservableValue<? extends Number> ov, Number t, Number newValue) {  
            progressIndicator .applyCss();  

            // If progress is 100% then show Text  
            if (newValue.doubleValue() >= 1.0) {  
                // Apply CSS so you can lookup the text  
                Text text = (Text) progressIndicator .lookup(".percentage");//also I checked .lookup(.text.percentage) version  
                System.out.println(text.getText());  
                // This text replaces "Done"  
                text.setText("some text");  
                //for testing  
                Text x= (Text) progressIndicator .lookup(".percentage");                 
                System.out.println(x.getText());//output shows that the text under progress indicator is changed  
                }  
      }}); 
        final HBox hb = new HBox();
        hb.setSpacing(5);
        hb.setAlignment(Pos.CENTER);
        hb.getChildren().addAll(label, progressIndicator);
        mainPane.setTop(hb);

        final Button startButton = new Button("Start");
        final Button cancelButton = new Button("Cancel");
        final HBox hb2 = new HBox();
        hb2.setSpacing(5);
        hb2.setAlignment(Pos.CENTER);
        hb2.getChildren().addAll(startButton, cancelButton);
        mainPane.setBottom(hb2);

        startButton.setOnAction(new EventHandler<ActionEvent>() {

            public void handle(ActionEvent event) {
                startButton.setDisable(true);
                progressIndicator.setProgress(0);
                cancelButton.setDisable(false);
                copyWorker = createWorker();

                progressIndicator.progressProperty().unbind();
                progressIndicator.progressProperty().bind(copyWorker.progressProperty());

                copyWorker.messageProperty().addListener(new ChangeListener<String>() {
                    public void changed(ObservableValue<? extends String> observable, String oldValue, String newValue) {
                        System.out.println(newValue);
                    }
                });

                new Thread(copyWorker).start();
            }
        });
        cancelButton.setOnAction(new EventHandler<ActionEvent>() {
            public void handle(ActionEvent event) {
                startButton.setDisable(false);
                cancelButton.setDisable(true);
                copyWorker.cancel(true);
                progressIndicator.progressProperty().unbind();
                progressIndicator.setProgress(0);
                System.out.println("cancelled.");
            }
        });
        primaryStage.setScene(scene);
        primaryStage.show();
    }

    public Task createWorker() {
        return new Task() {
            @Override
            protected Object call() throws Exception {
                for (int i = 0; i < 10; i++) {
                    Thread.sleep(100);
                    updateMessage("100 milliseconds");
                    updateProgress(i + 1, 10);
                }
                return true;
            }
        };
    }
}

Answer 1

您需要更改ProgressIndicator的文本，並將ProgressIndicator的寬度設置為Text的新寬度。

progressIndicator.progressProperty().addListener((ov, oldValue, newValue) -> {
     Text text = (Text) progressIndicator.lookup(".percentage");
     if(text!=null && text.getText().equals("Done")){
        text.setText("New Text");
        progressIndicator.setPrefWidth(text.getLayoutBounds().getWidth());
     }
});

完整的代碼

import javafx.application.Application;
import javafx.concurrent.Task;
import javafx.geometry.Pos;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.ProgressIndicator;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.HBox;
import javafx.scene.paint.Color;
import javafx.scene.text.Text;
import javafx.stage.Stage;

public class Main extends Application {
    Task copyWorker;

    @Override
    public void start(Stage primaryStage) {
        primaryStage.setTitle("Background Processes");
        Group root = new Group();
        Scene scene = new Scene(root, 330, 120, Color.WHITE);

        BorderPane mainPane = new BorderPane();
        root.getChildren().add(mainPane);

        final Label label = new Label("Files Transfer:");
        final ProgressIndicator progressIndicator = new ProgressIndicator(0);

        final HBox hb = new HBox();
        hb.setSpacing(5);
        hb.setAlignment(Pos.CENTER);
        hb.getChildren().addAll(label, progressIndicator);
        mainPane.setTop(hb);

        final Button startButton = new Button("Start");
        final Button cancelButton = new Button("Cancel");
        final HBox hb2 = new HBox();
        hb2.setSpacing(5);
        hb2.setAlignment(Pos.CENTER);
        hb2.getChildren().addAll(startButton, cancelButton);
        mainPane.setBottom(hb2);

        startButton.setOnAction(event -> {
            startButton.setDisable(true);
            progressIndicator.setProgress(0);
            cancelButton.setDisable(false);
            copyWorker = createWorker();

            progressIndicator.progressProperty().unbind();
            progressIndicator.progressProperty().bind(copyWorker.progressProperty());

            new Thread(copyWorker).start();
        });

        cancelButton.setOnAction(event -> {
            startButton.setDisable(false);
            cancelButton.setDisable(true);
            copyWorker.cancel(true);
            progressIndicator.progressProperty().unbind();
            progressIndicator.setProgress(0);
        });

        primaryStage.setScene(scene);
        primaryStage.show();

        progressIndicator.progressProperty().addListener((observable, oldValue, newValue) -> {
            Text text = (Text) progressIndicator.lookup(".percentage");
            if (text != null && text.getText().equals("Done")) {
                text.setText("New Text");
                progressIndicator.setPrefWidth(text.getLayoutBounds().getWidth());
            }
        });
    }

    public Task createWorker() {
        return new Task() {
            @Override
            protected Object call() throws Exception {
                for (int i = 0; i < 10; i++) {
                    Thread.sleep(500);
                    updateMessage("2000 milliseconds");
                    updateProgress(i + 1, 10);
                }
                return true;
            }
        };
    }

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

Answer 2

通過覆蓋控件包文件來更改ProgressIndicator標簽（以及所有其他默認標簽，如TextField上下文菜單標簽）是可行的。 在此文件中，您具有以下字段：

ProgressIndicator.doneString=YourTextHere

如何覆蓋ResourceBundle文件，您將在這里找到： https : //stackoverflow.com/a/48773353/7746751