JavaFx ListView 在每个项目中设置工具提示

Question

在下面尝试我的代码并重新打开窗口时，ListView 工具提示未显示。Tooltip tooltip1 = new Tooltip(timeToday()); listView.setTooltip(tooltip1);

Answer 1

这里可能已经有几个答案解释了如何ListCell在 a 中CellFactory为 the提供您自己的ListView答案，但下面是一个完整的示例，详细说明了该问题以及Tooltip在每个条目上设置 a ：

import javafx.application.Application;

import javafx.beans.property.SimpleStringProperty;

import javafx.beans.property.StringProperty;

import javafx.geometry.Insets;

import javafx.geometry.Pos;

import javafx.scene.Scene;

import javafx.scene.control.ListCell;

import javafx.scene.control.ListView;

import javafx.scene.control.Tooltip;

import javafx.scene.layout.VBox;

import javafx.stage.Stage;

public class CustomListCellSample extends Application {

    public static void main(String[] args) {

        launch(args);

    }

    @Override

    public void start(Stage primaryStage) {

        // Simple Interface

        VBox root = new VBox(10);

        root.setAlignment(Pos.CENTER);

        root.setPadding(new Insets(10));

        // Create a simple ListView

        ListView<Book> lvBooks = new ListView<>();

        // Populate our ListView with some sample books

        lvBooks.getItems().addAll(

                new Book("Great Expectations", "Charles Dickens"),

                new Book("Pride and Prejudice", "Jane Austen"),

                new Book("To Kill a Mockingbird", "Harper Lee"),

                new Book("1984", "George Orwell")

        );

        // We want to display the title of the Book in our ListView and show the author as a Tooltip

        // To do so, let's provide our own CellFactory

        lvBooks.setCellFactory(cell -> new ListCell<Book>() {

            // We want to create a single Tooltip that will be reused, as needed. We will simply update the text

            // for the Tooltip for each cell

            final Tooltip tooltip = new Tooltip();

            // We will override the updateItem() method of the ListCell so we can setup exactly what we want displayed

            // in each cell.  For this example, we'll just use the text of the cell, but you could also provide your

            // own layout entirely, by calling setGraphic() instead of the setText() used below.

            @Override

            protected void updateItem(Book book, boolean empty) {

                super.updateItem(book, empty);

                if (book == null || empty) {

                    // No book to display here (empty cell) so we clear the text and Tooltip

                    setText(null);

                    setTooltip(null);

                } else {

                    // A book is to be listed in this cell

                    setText(book.getTitle());

                    // Let's show our Author when the user hovers the mouse cursor over this row

                    tooltip.setText(book.getAuthor());

                    setTooltip(tooltip);

                }

            }

        });

        // Finally, add the ListView to our root VBox

        root.getChildren().add(lvBooks);

        // Show the stage

        primaryStage.setScene(new Scene(root));

        primaryStage.setTitle("CustomListCellSample Sample");

        primaryStage.show();

    }

}

// Simple Book class to be used as our data model

class Book {

    private final StringProperty title = new SimpleStringProperty();

    private final StringProperty author = new SimpleStringProperty();

    public Book(String title, String author) {

        this.title.set(title);

        this.author.set(author);

    }

    public String getTitle() {

        return title.get();

    }

    public StringProperty titleProperty() {

        return title;

    }

    public void setTitle(String title) {

        this.title.set(title);

    }

    public String getAuthor() {

        return author.get();

    }

    public StringProperty authorProperty() {

        return author;

    }

    public void setAuthor(String author) {

        this.author.set(author);

    }

}