java - 从 ListView Javafx 打印

Question

我有一个 javafx 应用程序，用户可以在其中的测试字段中输入一些详细信息，它会显示在 ListView 中。我现在有一个按钮可以使用 printjob 进行打印，但每次我按下打印按钮时，打印机都会打印垃圾数据，例如 jhsjs6sh3#uhbsbkahi 而不是 ListView 中的实际值。下面是我的打印功能代码

public void print (final Node node) {
        Printer printer = Printer.getDefaultPrinter();
        PageLayout pageLayout = printer.createPageLayout(Paper.A4, PageOrientation.PORTRAIT, Printer.MarginType.HARDWARE_MINIMUM);
        final double scaleX = pageLayout.getPrintableWidth() / node.getBoundsInParent().getWidth();
        final double scaleY = pageLayout.getPrintableHeight() / node.getBoundsInParent().getHeight();
        node.getTransforms().add(new Scale(scaleX, scaleY));

        PrinterJob job =PrinterJob.createPrinterJob();
        if (job != null ){

            boolean success = job.printPage(node);
            System.out.println("printed");
            if (success){
                System.out.println(success);
                job.endJob();
            }
        }

    }

@FXML private void printOps(ActionEvent event){ 打印(billingDataList);

我使用 MacBook 进行开发和使用 HP 打印机。

Answer 1

您必须计算出缩放比例。这使用 SnapShot 和 awt 进行打印。使用来自 here 的代码.

import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.awt.print.PageFormat;
import static java.awt.print.Printable.NO_SUCH_PAGE;
import static java.awt.print.Printable.PAGE_EXISTS;
import java.awt.print.PrinterException;
import java.awt.print.PrinterJob;
import java.io.File;
import java.io.IOException;
import javafx.application.Application;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.embed.swing.SwingFXUtils;
import javafx.scene.Scene;
import javafx.scene.SnapshotParameters;
import javafx.scene.control.Button;
import javafx.scene.control.ListView;
import javafx.scene.image.Image;
import javafx.scene.image.WritableImage;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;
import javax.imageio.ImageIO;

/**
 *
 * @author blj0011
 */
public class JavaFXApplication61 extends Application
{

    @Override
    public void start(Stage primaryStage)
    {
        ListView<String> list = new ListView<>();
        ObservableList<String> items = FXCollections.observableArrayList("A", "B", "C", "D");
        list.setItems(items);

        VBox root = new VBox();

        Button btn = new Button();
        btn.setText("Say 'Hello World'");
        btn.setOnAction((event) ->
        {
            WritableImage image = list.snapshot(new SnapshotParameters(), null);
            File file = new File("nodeImage.png");

            try
            {
                ImageIO.write(SwingFXUtils.fromFXImage(image, null), "png", file);

                Image imageToPrint = new Image(file.toURI().toString());
                BufferedImage bufferedImage = SwingFXUtils.fromFXImage(imageToPrint, null);
                printImage(bufferedImage);
            }
            catch (IOException ex)
            {
                System.out.println(ex.toString());
            }
        });

        root.getChildren().add(btn);
        root.getChildren().add(list);
        Scene scene = new Scene(root, 1080, 720);

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

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

    private void printImage(BufferedImage image)
    {
        PrinterJob printJob = PrinterJob.getPrinterJob();
        printJob.setPrintable((Graphics graphics, PageFormat pageFormat, int pageIndex) ->
        {
            // Get the upper left corner that it printable
            int x = (int) Math.ceil(pageFormat.getImageableX());
            int y = (int) Math.ceil(pageFormat.getImageableY());
            if (pageIndex != 0)
            {
                return NO_SUCH_PAGE;
            }
            graphics.drawImage(image, x, y, image.getWidth(), image.getHeight(), null);
            return PAGE_EXISTS;
        });
        try
        {
            printJob.print();
        }
        catch (PrinterException e1)
        {
            e1.printStackTrace();
        }
    }
}