如何在多页中打印大型 JPanel [英] How to print a large JPanel in several page

问题描述

我想打印一个非常大的面板，这个面板包含一些组件，如 jtable、jlabel 和其他 jpanel.现在我想在不同的页面上打印它.但我不知道该怎么做.我已经在我的面板类中实现了 Printable.但是如果我打印它，我只会得到一页.

I want to print a very large panel and this panel contains some components like jtable, jlabel and others jpanel. Now i want to print it in differents pages. But i don't know how to do it. I have implemented Printable in my panel class. But if i print it, I get only one page.

推荐答案

我对 Harry 的问题的编辑不是接受了，所以我将我的编辑作为新答案发布.

My edit to the question from Harry was not accepted, so I post my edits as a new answer.

以下代码对我有用(我测试过):

import java.awt.Component;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.print.*;

import javax.swing.RepaintManager;

public class PrintMultiPageUtil implements Printable, Pageable {
    private Component componentToBePrinted;
    private PageFormat format;
    private int numPages;

    public PrintMultiPageUtil(Component componentToBePrinted) {
        this.componentToBePrinted = componentToBePrinted;

        // get total space from component  
        Dimension totalSpace = this.componentToBePrinted.getPreferredSize();

        // calculate for DIN A4
        format = PrinterJob.getPrinterJob().defaultPage();
        numPages = (int) Math.ceil(totalSpace .height/format.getImageableHeight());
    }

    public void print() {
        PrinterJob printJob = PrinterJob.getPrinterJob();

        // show page-dialog with default DIN A4
        format = printJob.pageDialog(printJob.defaultPage());

        printJob.setPrintable(this);
        printJob.setPageable(this);

        if (printJob.printDialog())
            try {
                printJob.print();
            } catch(PrinterException pe) {
                System.out.println("Error printing: " + pe);
            }
    }

    public int print(Graphics g, PageFormat pageFormat, int pageIndex) {
        if ((pageIndex < 0) | (pageIndex >= numPages)) {
            return(NO_SUCH_PAGE);
        } else {
            Graphics2D g2d = (Graphics2D)g;
            g2d.translate(pageFormat.getImageableX(), pageFormat.getImageableY() - pageIndex * pageFormat.getImageableHeight());
            disableDoubleBuffering(componentToBePrinted);
            componentToBePrinted.paint(g2d);
            enableDoubleBuffering(componentToBePrinted);
            return(PAGE_EXISTS);
        }
    }

    public static void disableDoubleBuffering(Component c) {
        RepaintManager currentManager = RepaintManager.currentManager(c);
        currentManager.setDoubleBufferingEnabled(false);
    }

    public static void enableDoubleBuffering(Component c) {
        RepaintManager currentManager = RepaintManager.currentManager(c);
        currentManager.setDoubleBufferingEnabled(true);
    }

    @Override
    public int getNumberOfPages() {
        // TODO Auto-generated method stub
        return numPages;
    }

    @Override
    public PageFormat getPageFormat(int arg0) throws IndexOutOfBoundsException {
        return format;
    }

    @Override
    public Printable getPrintable(int arg0) throws IndexOutOfBoundsException {
        // TODO Auto-generated method stub
        return this;
    }
}

numPages

我将 numPages 的表达式更改为:

I changed the expression for numPages to:

(int) Math.ceil(page.height/format.getImageableHeight())

这将总高度(jpanel 的高度)除以一页的高度，从而计算出所有页数.

This divides the total height (height of the jpanel) through the height of one page, thus calculating the number of all pages.

g2d.translate

我做了以下更改:在这一行:

I did the following change: In this line:

g2d.translate(pageFormat.getImageableX(), pageFormat.getImageableY() - pageIndex * pageFormat.getImageableHeight());

将 componentToBePrinted.getPreferredSize().height 更改为 pageFormat.getImageableHeight().g2d.translate 的第一个或第二个参数的正值分别将图形向右或向下移动.

Changed componentToBePrinted.getPreferredSize().height to pageFormat.getImageableHeight(). A positive value for the first or the second parameter of g2d.translate moves the graphic to the right or down respectively.

.getImageableX() 和 .getImageableY() 帮助定位图形，使其不与填充重叠.

.getImageableX() and .getImageableY() help position the graphic so that it doesn't overlap with the padding.

对于pageIndex大于0，- pageIndex * pageFormat.getImageableHeight()移动图片pageIndex-乘以页面高度到顶部.因此，pageIndex 所指的区域被打印出来.

For pageIndex greater than 0, - pageIndex * pageFormat.getImageableHeight() moves the image pageIndex-times the page-height to the top. So the area, that the pageIndex refers to is printed.

原始损坏源:

https://community.oracle.com

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